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/flags/flagSetting.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/sweeper.hpp"
61 #include "runtime/vmThread.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/dtrace.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/resourceHash.hpp"
66 #include "utilities/xmlstream.hpp"
67 #if INCLUDE_JVMCI
68 #include "jvmci/jvmciRuntime.hpp"
69 #endif
70
71 #ifdef DTRACE_ENABLED
72
73 // Only bother with this argument setup if dtrace is available
74
75 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
76 { \
77 Method* m = (method); \
78 if (m != NULL) { \
79 Symbol* klass_name = m->klass_name(); \
80 Symbol* name = m->name(); \
81 Symbol* signature = m->signature(); \
82 HOTSPOT_COMPILED_METHOD_UNLOAD( \
83 (char *) klass_name->bytes(), klass_name->utf8_length(), \
84 (char *) name->bytes(), name->utf8_length(), \
85 (char *) signature->bytes(), signature->utf8_length()); \
86 } \
87 }
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_UNLOAD_PROBE(method)
92
93 #endif
94
95 //---------------------------------------------------------------------------------
96 // NMethod statistics
97 // They are printed under various flags, including:
98 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
99 // (In the latter two cases, they like other stats are printed to the log only.)
100
101 #ifndef PRODUCT
102 // These variables are put into one block to reduce relocations
103 // and make it simpler to print from the debugger.
104 struct java_nmethod_stats_struct {
105 int nmethod_count;
106 int total_size;
107 int relocation_size;
108 int consts_size;
109 int insts_size;
110 int stub_size;
111 int scopes_data_size;
112 int scopes_pcs_size;
113 int dependencies_size;
114 int handler_table_size;
115 int nul_chk_table_size;
116 #if INCLUDE_JVMCI
117 int speculations_size;
118 int jvmci_data_size;
119 #endif
120 int oops_size;
121 int metadata_size;
122
123 void note_nmethod(nmethod* nm) {
124 nmethod_count += 1;
125 total_size += nm->size();
126 relocation_size += nm->relocation_size();
127 consts_size += nm->consts_size();
128 insts_size += nm->insts_size();
129 stub_size += nm->stub_size();
130 oops_size += nm->oops_size();
131 metadata_size += nm->metadata_size();
132 scopes_data_size += nm->scopes_data_size();
133 scopes_pcs_size += nm->scopes_pcs_size();
134 dependencies_size += nm->dependencies_size();
135 handler_table_size += nm->handler_table_size();
136 nul_chk_table_size += nm->nul_chk_table_size();
137 #if INCLUDE_JVMCI
138 speculations_size += nm->speculations_size();
139 jvmci_data_size += nm->jvmci_data_size();
140 #endif
141 }
142 void print_nmethod_stats(const char* name) {
143 if (nmethod_count == 0) return;
144 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
145 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
146 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
147 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
148 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
149 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
150 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
151 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
152 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
153 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
154 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
155 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
156 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
157 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
158 #if INCLUDE_JVMCI
159 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
160 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
161 #endif
162 }
163 };
164
165 struct native_nmethod_stats_struct {
166 int native_nmethod_count;
167 int native_total_size;
168 int native_relocation_size;
169 int native_insts_size;
170 int native_oops_size;
171 int native_metadata_size;
172 void note_native_nmethod(nmethod* nm) {
173 native_nmethod_count += 1;
174 native_total_size += nm->size();
175 native_relocation_size += nm->relocation_size();
176 native_insts_size += nm->insts_size();
177 native_oops_size += nm->oops_size();
178 native_metadata_size += nm->metadata_size();
179 }
180 void print_native_nmethod_stats() {
181 if (native_nmethod_count == 0) return;
182 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
183 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
184 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
185 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
186 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
187 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
188 }
189 };
190
191 struct pc_nmethod_stats_struct {
192 int pc_desc_resets; // number of resets (= number of caches)
193 int pc_desc_queries; // queries to nmethod::find_pc_desc
194 int pc_desc_approx; // number of those which have approximate true
195 int pc_desc_repeats; // number of _pc_descs[0] hits
196 int pc_desc_hits; // number of LRU cache hits
197 int pc_desc_tests; // total number of PcDesc examinations
198 int pc_desc_searches; // total number of quasi-binary search steps
199 int pc_desc_adds; // number of LUR cache insertions
200
201 void print_pc_stats() {
202 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
203 pc_desc_queries,
204 (double)(pc_desc_tests + pc_desc_searches)
205 / pc_desc_queries);
206 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
207 pc_desc_resets,
208 pc_desc_queries, pc_desc_approx,
209 pc_desc_repeats, pc_desc_hits,
210 pc_desc_tests, pc_desc_searches, pc_desc_adds);
211 }
212 };
213
214 #ifdef COMPILER1
215 static java_nmethod_stats_struct c1_java_nmethod_stats;
216 #endif
217 #ifdef COMPILER2
218 static java_nmethod_stats_struct c2_java_nmethod_stats;
219 #endif
220 #if INCLUDE_JVMCI
221 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
222 #endif
223 static java_nmethod_stats_struct unknown_java_nmethod_stats;
224
225 static native_nmethod_stats_struct native_nmethod_stats;
226 static pc_nmethod_stats_struct pc_nmethod_stats;
227
228 static void note_java_nmethod(nmethod* nm) {
229 #ifdef COMPILER1
230 if (nm->is_compiled_by_c1()) {
231 c1_java_nmethod_stats.note_nmethod(nm);
232 } else
233 #endif
234 #ifdef COMPILER2
235 if (nm->is_compiled_by_c2()) {
236 c2_java_nmethod_stats.note_nmethod(nm);
237 } else
238 #endif
239 #if INCLUDE_JVMCI
240 if (nm->is_compiled_by_jvmci()) {
241 jvmci_java_nmethod_stats.note_nmethod(nm);
242 } else
243 #endif
244 {
245 unknown_java_nmethod_stats.note_nmethod(nm);
246 }
247 }
248 #endif // !PRODUCT
249
250 //---------------------------------------------------------------------------------
251
252
253 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
254 assert(pc != NULL, "Must be non null");
255 assert(exception.not_null(), "Must be non null");
256 assert(handler != NULL, "Must be non null");
257
258 _count = 0;
259 _exception_type = exception->klass();
260 _next = NULL;
261 _purge_list_next = NULL;
262
263 add_address_and_handler(pc,handler);
264 }
265
266
267 address ExceptionCache::match(Handle exception, address pc) {
268 assert(pc != NULL,"Must be non null");
269 assert(exception.not_null(),"Must be non null");
270 if (exception->klass() == exception_type()) {
271 return (test_address(pc));
272 }
273
274 return NULL;
275 }
276
277
278 bool ExceptionCache::match_exception_with_space(Handle exception) {
279 assert(exception.not_null(),"Must be non null");
280 if (exception->klass() == exception_type() && count() < cache_size) {
281 return true;
282 }
283 return false;
284 }
285
286
287 address ExceptionCache::test_address(address addr) {
288 int limit = count();
289 for (int i = 0; i < limit; i++) {
290 if (pc_at(i) == addr) {
291 return handler_at(i);
292 }
293 }
294 return NULL;
295 }
296
297
298 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
299 if (test_address(addr) == handler) return true;
300
301 int index = count();
302 if (index < cache_size) {
303 set_pc_at(index, addr);
304 set_handler_at(index, handler);
305 increment_count();
306 return true;
307 }
308 return false;
309 }
310
311 ExceptionCache* ExceptionCache::next() {
312 return Atomic::load(&_next);
313 }
314
315 void ExceptionCache::set_next(ExceptionCache *ec) {
316 Atomic::store(ec, &_next);
317 }
318
319 //-----------------------------------------------------------------------------
320
321
322 // Helper used by both find_pc_desc methods.
323 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
324 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
325 if (!approximate)
326 return pc->pc_offset() == pc_offset;
327 else
328 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
329 }
330
331 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
332 if (initial_pc_desc == NULL) {
333 _pc_descs[0] = NULL; // native method; no PcDescs at all
334 return;
335 }
336 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
337 // reset the cache by filling it with benign (non-null) values
338 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
339 for (int i = 0; i < cache_size; i++)
340 _pc_descs[i] = initial_pc_desc;
341 }
342
343 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
344 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
345 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
346
347 // Note: one might think that caching the most recently
348 // read value separately would be a win, but one would be
349 // wrong. When many threads are updating it, the cache
350 // line it's in would bounce between caches, negating
351 // any benefit.
352
353 // In order to prevent race conditions do not load cache elements
354 // repeatedly, but use a local copy:
355 PcDesc* res;
356
357 // Step one: Check the most recently added value.
358 res = _pc_descs[0];
359 if (res == NULL) return NULL; // native method; no PcDescs at all
360 if (match_desc(res, pc_offset, approximate)) {
361 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
362 return res;
363 }
364
365 // Step two: Check the rest of the LRU cache.
366 for (int i = 1; i < cache_size; ++i) {
367 res = _pc_descs[i];
368 if (res->pc_offset() < 0) break; // optimization: skip empty cache
369 if (match_desc(res, pc_offset, approximate)) {
370 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
371 return res;
372 }
373 }
374
375 // Report failure.
376 return NULL;
377 }
378
379 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
380 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
381 // Update the LRU cache by shifting pc_desc forward.
382 for (int i = 0; i < cache_size; i++) {
383 PcDesc* next = _pc_descs[i];
384 _pc_descs[i] = pc_desc;
385 pc_desc = next;
386 }
387 }
388
389 // adjust pcs_size so that it is a multiple of both oopSize and
390 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
391 // of oopSize, then 2*sizeof(PcDesc) is)
392 static int adjust_pcs_size(int pcs_size) {
393 int nsize = align_up(pcs_size, oopSize);
394 if ((nsize % sizeof(PcDesc)) != 0) {
395 nsize = pcs_size + sizeof(PcDesc);
396 }
397 assert((nsize % oopSize) == 0, "correct alignment");
398 return nsize;
399 }
400
401
402 int nmethod::total_size() const {
403 return
404 consts_size() +
405 insts_size() +
406 stub_size() +
407 scopes_data_size() +
408 scopes_pcs_size() +
409 handler_table_size() +
410 nul_chk_table_size();
411 }
412
413 address* nmethod::orig_pc_addr(const frame* fr) {
414 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
415 }
416
417 const char* nmethod::compile_kind() const {
418 if (is_osr_method()) return "osr";
419 if (method() != NULL && is_native_method()) return "c2n";
420 return NULL;
421 }
422
423 // Fill in default values for various flag fields
424 void nmethod::init_defaults() {
425 _state = not_installed;
426 _has_flushed_dependencies = 0;
427 _lock_count = 0;
428 _stack_traversal_mark = 0;
429 _unload_reported = false; // jvmti state
430 _is_far_code = false; // nmethods are located in CodeCache
431
432 #ifdef ASSERT
433 _oops_are_stale = false;
434 #endif
435
436 _oops_do_mark_link = NULL;
437 _jmethod_id = NULL;
438 _osr_link = NULL;
439 #if INCLUDE_RTM_OPT
440 _rtm_state = NoRTM;
441 #endif
442 }
443
444 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
445 int compile_id,
446 CodeBuffer *code_buffer,
447 int vep_offset,
448 int frame_complete,
449 int frame_size,
450 ByteSize basic_lock_owner_sp_offset,
451 ByteSize basic_lock_sp_offset,
452 OopMapSet* oop_maps) {
453 code_buffer->finalize_oop_references(method);
454 // create nmethod
455 nmethod* nm = NULL;
456 {
457 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
458 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
459 CodeOffsets offsets;
460 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
461 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
462 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
463 compile_id, &offsets,
464 code_buffer, frame_size,
465 basic_lock_owner_sp_offset,
466 basic_lock_sp_offset, oop_maps);
467 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
468 }
469
470 if (nm != NULL) {
471 // verify nmethod
472 debug_only(nm->verify();) // might block
473
474 nm->log_new_nmethod();
475 nm->make_in_use();
476 }
477 return nm;
478 }
479
480 nmethod* nmethod::new_nmethod(const methodHandle& method,
481 int compile_id,
482 int entry_bci,
483 CodeOffsets* offsets,
484 int orig_pc_offset,
485 DebugInformationRecorder* debug_info,
486 Dependencies* dependencies,
487 CodeBuffer* code_buffer, int frame_size,
488 OopMapSet* oop_maps,
489 ExceptionHandlerTable* handler_table,
490 ImplicitExceptionTable* nul_chk_table,
491 AbstractCompiler* compiler,
492 int comp_level
493 #if INCLUDE_JVMCI
494 , char* speculations,
495 int speculations_len,
496 int nmethod_mirror_index,
497 const char* nmethod_mirror_name,
498 FailedSpeculation** failed_speculations
499 #endif
500 )
501 {
502 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
503 code_buffer->finalize_oop_references(method);
504 // create nmethod
505 nmethod* nm = NULL;
506 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
507 #if INCLUDE_JVMCI
508 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
509 #endif
510 int nmethod_size =
511 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
512 + adjust_pcs_size(debug_info->pcs_size())
513 + align_up((int)dependencies->size_in_bytes(), oopSize)
514 + align_up(handler_table->size_in_bytes() , oopSize)
515 + align_up(nul_chk_table->size_in_bytes() , oopSize)
516 #if INCLUDE_JVMCI
517 + align_up(speculations_len , oopSize)
518 + align_up(jvmci_data_size , oopSize)
519 #endif
520 + align_up(debug_info->data_size() , oopSize);
521
522 nm = new (nmethod_size, comp_level)
523 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
524 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
525 oop_maps,
526 handler_table,
527 nul_chk_table,
528 compiler,
529 comp_level
530 #if INCLUDE_JVMCI
531 , speculations,
532 speculations_len,
533 jvmci_data_size
534 #endif
535 );
536
537 if (nm != NULL) {
538 #if INCLUDE_JVMCI
539 if (compiler->is_jvmci()) {
540 // Initialize the JVMCINMethodData object inlined into nm
541 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
542 }
543 #endif
544 // To make dependency checking during class loading fast, record
545 // the nmethod dependencies in the classes it is dependent on.
546 // This allows the dependency checking code to simply walk the
547 // class hierarchy above the loaded class, checking only nmethods
548 // which are dependent on those classes. The slow way is to
549 // check every nmethod for dependencies which makes it linear in
550 // the number of methods compiled. For applications with a lot
551 // classes the slow way is too slow.
552 for (Dependencies::DepStream deps(nm); deps.next(); ) {
553 if (deps.type() == Dependencies::call_site_target_value) {
554 // CallSite dependencies are managed on per-CallSite instance basis.
555 oop call_site = deps.argument_oop(0);
556 MethodHandles::add_dependent_nmethod(call_site, nm);
557 } else {
558 Klass* klass = deps.context_type();
559 if (klass == NULL) {
560 continue; // ignore things like evol_method
561 }
562 // record this nmethod as dependent on this klass
563 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
564 }
565 }
566 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
567 }
568 }
569 // Do verification and logging outside CodeCache_lock.
570 if (nm != NULL) {
571 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
572 DEBUG_ONLY(nm->verify();)
573 nm->log_new_nmethod();
574 }
575 return nm;
576 }
577
578 // For native wrappers
579 nmethod::nmethod(
580 Method* method,
581 CompilerType type,
582 int nmethod_size,
583 int compile_id,
584 CodeOffsets* offsets,
585 CodeBuffer* code_buffer,
586 int frame_size,
587 ByteSize basic_lock_owner_sp_offset,
588 ByteSize basic_lock_sp_offset,
589 OopMapSet* oop_maps )
590 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
591 _is_unloading_state(0),
592 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
593 _native_basic_lock_sp_offset(basic_lock_sp_offset)
594 {
595 {
596 int scopes_data_offset = 0;
597 int deoptimize_offset = 0;
598 int deoptimize_mh_offset = 0;
599
600 debug_only(NoSafepointVerifier nsv;)
601 assert_locked_or_safepoint(CodeCache_lock);
602
603 init_defaults();
604 _entry_bci = InvocationEntryBci;
605 // We have no exception handler or deopt handler make the
606 // values something that will never match a pc like the nmethod vtable entry
607 _exception_offset = 0;
608 _orig_pc_offset = 0;
609
610 _consts_offset = data_offset();
611 _stub_offset = data_offset();
612 _oops_offset = data_offset();
613 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
614 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
615 _scopes_pcs_offset = scopes_data_offset;
616 _dependencies_offset = _scopes_pcs_offset;
617 _handler_table_offset = _dependencies_offset;
618 _nul_chk_table_offset = _handler_table_offset;
619 #if INCLUDE_JVMCI
620 _speculations_offset = _nul_chk_table_offset;
621 _jvmci_data_offset = _speculations_offset;
622 _nmethod_end_offset = _jvmci_data_offset;
623 #else
624 _nmethod_end_offset = _nul_chk_table_offset;
625 #endif
626 _compile_id = compile_id;
627 _comp_level = CompLevel_none;
628 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
629 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
630 _osr_entry_point = NULL;
631 _exception_cache = NULL;
632 _pc_desc_container.reset_to(NULL);
633 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
634
635 _scopes_data_begin = (address) this + scopes_data_offset;
636 _deopt_handler_begin = (address) this + deoptimize_offset;
637 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
638
639 code_buffer->copy_code_and_locs_to(this);
640 code_buffer->copy_values_to(this);
641
642 clear_unloading_state();
643
644 Universe::heap()->register_nmethod(this);
645 debug_only(Universe::heap()->verify_nmethod(this));
646
647 CodeCache::commit(this);
648 }
649
650 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
651 ttyLocker ttyl; // keep the following output all in one block
652 // This output goes directly to the tty, not the compiler log.
653 // To enable tools to match it up with the compilation activity,
654 // be sure to tag this tty output with the compile ID.
655 if (xtty != NULL) {
656 xtty->begin_head("print_native_nmethod");
657 xtty->method(_method);
658 xtty->stamp();
659 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
660 }
661 // print the header part first
662 print();
663 // then print the requested information
664 if (PrintNativeNMethods) {
665 print_code();
666 if (oop_maps != NULL) {
667 oop_maps->print();
668 }
669 }
670 if (PrintRelocations) {
671 print_relocations();
672 }
673 if (xtty != NULL) {
674 xtty->tail("print_native_nmethod");
675 }
676 }
677 }
678
679 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
680 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
681 }
682
683 nmethod::nmethod(
684 Method* method,
685 CompilerType type,
686 int nmethod_size,
687 int compile_id,
688 int entry_bci,
689 CodeOffsets* offsets,
690 int orig_pc_offset,
691 DebugInformationRecorder* debug_info,
692 Dependencies* dependencies,
693 CodeBuffer *code_buffer,
694 int frame_size,
695 OopMapSet* oop_maps,
696 ExceptionHandlerTable* handler_table,
697 ImplicitExceptionTable* nul_chk_table,
698 AbstractCompiler* compiler,
699 int comp_level
700 #if INCLUDE_JVMCI
701 , char* speculations,
702 int speculations_len,
703 int jvmci_data_size
704 #endif
705 )
706 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
707 _is_unloading_state(0),
708 _native_receiver_sp_offset(in_ByteSize(-1)),
709 _native_basic_lock_sp_offset(in_ByteSize(-1))
710 {
711 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
712 {
713 debug_only(NoSafepointVerifier nsv;)
714 assert_locked_or_safepoint(CodeCache_lock);
715
716 _deopt_handler_begin = (address) this;
717 _deopt_mh_handler_begin = (address) this;
718
719 init_defaults();
720 _entry_bci = entry_bci;
721 _compile_id = compile_id;
722 _comp_level = comp_level;
723 _orig_pc_offset = orig_pc_offset;
724 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
725
726 // Section offsets
727 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
728 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
729 set_ctable_begin(header_begin() + _consts_offset);
730
731 #if INCLUDE_JVMCI
732 if (compiler->is_jvmci()) {
733 // JVMCI might not produce any stub sections
734 if (offsets->value(CodeOffsets::Exceptions) != -1) {
735 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
736 } else {
737 _exception_offset = -1;
738 }
739 if (offsets->value(CodeOffsets::Deopt) != -1) {
740 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
741 } else {
742 _deopt_handler_begin = NULL;
743 }
744 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
745 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
746 } else {
747 _deopt_mh_handler_begin = NULL;
748 }
749 } else {
750 #endif
751 // Exception handler and deopt handler are in the stub section
752 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
753 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
754
755 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
756 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
757 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
758 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
759 } else {
760 _deopt_mh_handler_begin = NULL;
761 }
762 #if INCLUDE_JVMCI
763 }
764 #endif
765 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
766 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
767 } else {
768 _unwind_handler_offset = -1;
769 }
770
771 _oops_offset = data_offset();
772 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
773 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
774
775 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
776 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
777 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
778 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
779 #if INCLUDE_JVMCI
780 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
781 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
782 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
783 #else
784 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
785 #endif
786 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
787 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
788 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
789 _exception_cache = NULL;
790
791 _scopes_data_begin = (address) this + scopes_data_offset;
792
793 _pc_desc_container.reset_to(scopes_pcs_begin());
794
795 code_buffer->copy_code_and_locs_to(this);
796 // Copy contents of ScopeDescRecorder to nmethod
797 code_buffer->copy_values_to(this);
798 debug_info->copy_to(this);
799 dependencies->copy_to(this);
800 clear_unloading_state();
801
802 Universe::heap()->register_nmethod(this);
803 debug_only(Universe::heap()->verify_nmethod(this));
804
805 CodeCache::commit(this);
806
807 // Copy contents of ExceptionHandlerTable to nmethod
808 handler_table->copy_to(this);
809 nul_chk_table->copy_to(this);
810
811 #if INCLUDE_JVMCI
812 // Copy speculations to nmethod
813 if (speculations_size() != 0) {
814 memcpy(speculations_begin(), speculations, speculations_len);
815 }
816 #endif
817
818 // we use the information of entry points to find out if a method is
819 // static or non static
820 assert(compiler->is_c2() || compiler->is_jvmci() ||
821 _method->is_static() == (entry_point() == _verified_entry_point),
822 " entry points must be same for static methods and vice versa");
823 }
824 }
825
826 // Print a short set of xml attributes to identify this nmethod. The
827 // output should be embedded in some other element.
828 void nmethod::log_identity(xmlStream* log) const {
829 log->print(" compile_id='%d'", compile_id());
830 const char* nm_kind = compile_kind();
831 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
832 log->print(" compiler='%s'", compiler_name());
833 if (TieredCompilation) {
834 log->print(" level='%d'", comp_level());
835 }
836 #if INCLUDE_JVMCI
837 if (jvmci_nmethod_data() != NULL) {
838 const char* jvmci_name = jvmci_nmethod_data()->name();
839 if (jvmci_name != NULL) {
840 log->print(" jvmci_mirror_name='");
841 log->text("%s", jvmci_name);
842 log->print("'");
843 }
844 }
845 #endif
846 }
847
848
849 #define LOG_OFFSET(log, name) \
850 if (p2i(name##_end()) - p2i(name##_begin())) \
851 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
852 p2i(name##_begin()) - p2i(this))
853
854
855 void nmethod::log_new_nmethod() const {
856 if (LogCompilation && xtty != NULL) {
857 ttyLocker ttyl;
858 HandleMark hm;
859 xtty->begin_elem("nmethod");
860 log_identity(xtty);
861 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
862 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
863
864 LOG_OFFSET(xtty, relocation);
865 LOG_OFFSET(xtty, consts);
866 LOG_OFFSET(xtty, insts);
867 LOG_OFFSET(xtty, stub);
868 LOG_OFFSET(xtty, scopes_data);
869 LOG_OFFSET(xtty, scopes_pcs);
870 LOG_OFFSET(xtty, dependencies);
871 LOG_OFFSET(xtty, handler_table);
872 LOG_OFFSET(xtty, nul_chk_table);
873 LOG_OFFSET(xtty, oops);
874 LOG_OFFSET(xtty, metadata);
875
876 xtty->method(method());
877 xtty->stamp();
878 xtty->end_elem();
879 }
880 }
881
882 #undef LOG_OFFSET
883
884
885 // Print out more verbose output usually for a newly created nmethod.
886 void nmethod::print_on(outputStream* st, const char* msg) const {
887 if (st != NULL) {
888 ttyLocker ttyl;
889 if (WizardMode) {
890 CompileTask::print(st, this, msg, /*short_form:*/ true);
891 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
892 } else {
893 CompileTask::print(st, this, msg, /*short_form:*/ false);
894 }
895 }
896 }
897
898 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
899 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
900 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
901 print_nmethod(printnmethods);
902 }
903 }
904
905 void nmethod::print_nmethod(bool printmethod) {
906 ttyLocker ttyl; // keep the following output all in one block
907 if (xtty != NULL) {
908 xtty->begin_head("print_nmethod");
909 xtty->stamp();
910 xtty->end_head();
911 }
912 // print the header part first
913 print();
914 // then print the requested information
915 if (printmethod) {
916 print_code();
917 print_pcs();
918 if (oop_maps()) {
919 oop_maps()->print();
920 }
921 }
922 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
923 print_scopes();
924 }
925 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
926 print_relocations();
927 }
928 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
929 print_dependencies();
930 }
931 if (printmethod || PrintExceptionHandlers) {
932 print_handler_table();
933 print_nul_chk_table();
934 }
935 if (printmethod) {
936 print_recorded_oops();
937 print_recorded_metadata();
938 }
939 if (xtty != NULL) {
940 xtty->tail("print_nmethod");
941 }
942 }
943
944
945 // Promote one word from an assembly-time handle to a live embedded oop.
946 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
947 if (handle == NULL ||
948 // As a special case, IC oops are initialized to 1 or -1.
949 handle == (jobject) Universe::non_oop_word()) {
950 (*dest) = (oop) handle;
951 } else {
952 (*dest) = JNIHandles::resolve_non_null(handle);
953 }
954 }
955
956
957 // Have to have the same name because it's called by a template
958 void nmethod::copy_values(GrowableArray<jobject>* array) {
959 int length = array->length();
960 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
961 oop* dest = oops_begin();
962 for (int index = 0 ; index < length; index++) {
963 initialize_immediate_oop(&dest[index], array->at(index));
964 }
965
966 // Now we can fix up all the oops in the code. We need to do this
967 // in the code because the assembler uses jobjects as placeholders.
968 // The code and relocations have already been initialized by the
969 // CodeBlob constructor, so it is valid even at this early point to
970 // iterate over relocations and patch the code.
971 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
972 }
973
974 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
975 int length = array->length();
976 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
977 Metadata** dest = metadata_begin();
978 for (int index = 0 ; index < length; index++) {
979 dest[index] = array->at(index);
980 }
981 }
982
983 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
984 // re-patch all oop-bearing instructions, just in case some oops moved
985 RelocIterator iter(this, begin, end);
986 while (iter.next()) {
987 if (iter.type() == relocInfo::oop_type) {
988 oop_Relocation* reloc = iter.oop_reloc();
989 if (initialize_immediates && reloc->oop_is_immediate()) {
990 oop* dest = reloc->oop_addr();
991 initialize_immediate_oop(dest, (jobject) *dest);
992 }
993 // Refresh the oop-related bits of this instruction.
994 reloc->fix_oop_relocation();
995 } else if (iter.type() == relocInfo::metadata_type) {
996 metadata_Relocation* reloc = iter.metadata_reloc();
997 reloc->fix_metadata_relocation();
998 }
999 }
1000 }
1001
1002
1003 void nmethod::verify_clean_inline_caches() {
1004 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1005
1006 ResourceMark rm;
1007 RelocIterator iter(this, oops_reloc_begin());
1008 while(iter.next()) {
1009 switch(iter.type()) {
1010 case relocInfo::virtual_call_type:
1011 case relocInfo::opt_virtual_call_type: {
1012 CompiledIC *ic = CompiledIC_at(&iter);
1013 // Ok, to lookup references to zombies here
1014 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1015 assert(cb != NULL, "destination not in CodeBlob?");
1016 nmethod* nm = cb->as_nmethod_or_null();
1017 if( nm != NULL ) {
1018 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1019 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1020 assert(ic->is_clean(), "IC should be clean");
1021 }
1022 }
1023 break;
1024 }
1025 case relocInfo::static_call_type: {
1026 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1027 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1028 assert(cb != NULL, "destination not in CodeBlob?");
1029 nmethod* nm = cb->as_nmethod_or_null();
1030 if( nm != NULL ) {
1031 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1032 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1033 assert(csc->is_clean(), "IC should be clean");
1034 }
1035 }
1036 break;
1037 }
1038 default:
1039 break;
1040 }
1041 }
1042 }
1043
1044 // This is a private interface with the sweeper.
1045 void nmethod::mark_as_seen_on_stack() {
1046 assert(is_alive(), "Must be an alive method");
1047 // Set the traversal mark to ensure that the sweeper does 2
1048 // cleaning passes before moving to zombie.
1049 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1050 }
1051
1052 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1053 // there are no activations on the stack, not in use by the VM,
1054 // and not in use by the ServiceThread)
1055 bool nmethod::can_convert_to_zombie() {
1056 // Note that this is called when the sweeper has observed the nmethod to be
1057 // not_entrant. However, with concurrent code cache unloading, the state
1058 // might have moved on to unloaded if it is_unloading(), due to racing
1059 // concurrent GC threads.
1060 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1061
1062 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1063 // count can be greater than the stack traversal count before it hits the
1064 // nmethod for the second time.
1065 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1066 // convert it to zombie due to GC unloading interactions. However, if it
1067 // has become unloaded, then it is okay to convert such nmethods to zombie.
1068 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1069 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1070 }
1071
1072 void nmethod::inc_decompile_count() {
1073 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1074 // Could be gated by ProfileTraps, but do not bother...
1075 Method* m = method();
1076 if (m == NULL) return;
1077 MethodData* mdo = m->method_data();
1078 if (mdo == NULL) return;
1079 // There is a benign race here. See comments in methodData.hpp.
1080 mdo->inc_decompile_count();
1081 }
1082
1083 void nmethod::make_unloaded() {
1084 post_compiled_method_unload();
1085
1086 // This nmethod is being unloaded, make sure that dependencies
1087 // recorded in instanceKlasses get flushed.
1088 // Since this work is being done during a GC, defer deleting dependencies from the
1089 // InstanceKlass.
1090 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1091 "should only be called during gc");
1092 flush_dependencies(/*delete_immediately*/false);
1093
1094 // Break cycle between nmethod & method
1095 LogTarget(Trace, class, unload, nmethod) lt;
1096 if (lt.is_enabled()) {
1097 LogStream ls(lt);
1098 ls.print("making nmethod " INTPTR_FORMAT
1099 " unloadable, Method*(" INTPTR_FORMAT
1100 ") ",
1101 p2i(this), p2i(_method));
1102 ls.cr();
1103 }
1104 // Unlink the osr method, so we do not look this up again
1105 if (is_osr_method()) {
1106 // Invalidate the osr nmethod only once
1107 if (is_in_use()) {
1108 invalidate_osr_method();
1109 }
1110 #ifdef ASSERT
1111 if (method() != NULL) {
1112 // Make sure osr nmethod is invalidated, i.e. not on the list
1113 bool found = method()->method_holder()->remove_osr_nmethod(this);
1114 assert(!found, "osr nmethod should have been invalidated");
1115 }
1116 #endif
1117 }
1118
1119 // If _method is already NULL the Method* is about to be unloaded,
1120 // so we don't have to break the cycle. Note that it is possible to
1121 // have the Method* live here, in case we unload the nmethod because
1122 // it is pointing to some oop (other than the Method*) being unloaded.
1123 if (_method != NULL) {
1124 // OSR methods point to the Method*, but the Method* does not
1125 // point back!
1126 if (_method->code() == this) {
1127 _method->clear_code(); // Break a cycle
1128 }
1129 }
1130
1131 // Make the class unloaded - i.e., change state and notify sweeper
1132 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1133 "must be at safepoint");
1134
1135 {
1136 // Clear ICStubs and release any CompiledICHolders.
1137 CompiledICLocker ml(this);
1138 clear_ic_callsites();
1139 }
1140
1141 // Unregister must be done before the state change
1142 {
1143 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1144 Mutex::_no_safepoint_check_flag);
1145 Universe::heap()->unregister_nmethod(this);
1146 }
1147
1148 // Clear the method of this dead nmethod
1149 set_method(NULL);
1150
1151 // Log the unloading.
1152 log_state_change();
1153
1154 // The Method* is gone at this point
1155 assert(_method == NULL, "Tautology");
1156
1157 set_osr_link(NULL);
1158 NMethodSweeper::report_state_change(this);
1159
1160 // The release is only needed for compile-time ordering, as accesses
1161 // into the nmethod after the store are not safe due to the sweeper
1162 // being allowed to free it when the store is observed, during
1163 // concurrent nmethod unloading. Therefore, there is no need for
1164 // acquire on the loader side.
1165 OrderAccess::release_store(&_state, (signed char)unloaded);
1166
1167 #if INCLUDE_JVMCI
1168 // Clear the link between this nmethod and a HotSpotNmethod mirror
1169 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1170 if (nmethod_data != NULL) {
1171 nmethod_data->invalidate_nmethod_mirror(this);
1172 nmethod_data->clear_nmethod_mirror(this);
1173 }
1174 #endif
1175 }
1176
1177 void nmethod::invalidate_osr_method() {
1178 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1179 // Remove from list of active nmethods
1180 if (method() != NULL) {
1181 method()->method_holder()->remove_osr_nmethod(this);
1182 }
1183 }
1184
1185 void nmethod::log_state_change() const {
1186 if (LogCompilation) {
1187 if (xtty != NULL) {
1188 ttyLocker ttyl; // keep the following output all in one block
1189 if (_state == unloaded) {
1190 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1191 os::current_thread_id());
1192 } else {
1193 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1194 os::current_thread_id(),
1195 (_state == zombie ? " zombie='1'" : ""));
1196 }
1197 log_identity(xtty);
1198 xtty->stamp();
1199 xtty->end_elem();
1200 }
1201 }
1202
1203 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1204 CompileTask::print_ul(this, state_msg);
1205 if (PrintCompilation && _state != unloaded) {
1206 print_on(tty, state_msg);
1207 }
1208 }
1209
1210 void nmethod::unlink_from_method(bool acquire_lock) {
1211 // We need to check if both the _code and _from_compiled_code_entry_point
1212 // refer to this nmethod because there is a race in setting these two fields
1213 // in Method* as seen in bugid 4947125.
1214 // If the vep() points to the zombie nmethod, the memory for the nmethod
1215 // could be flushed and the compiler and vtable stubs could still call
1216 // through it.
1217 if (method() != NULL && (method()->code() == this ||
1218 method()->from_compiled_entry() == verified_entry_point())) {
1219 method()->clear_code(acquire_lock);
1220 }
1221 }
1222
1223 /**
1224 * Common functionality for both make_not_entrant and make_zombie
1225 */
1226 bool nmethod::make_not_entrant_or_zombie(int state) {
1227 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1228 assert(!is_zombie(), "should not already be a zombie");
1229
1230 if (_state == state) {
1231 // Avoid taking the lock if already in required state.
1232 // This is safe from races because the state is an end-state,
1233 // which the nmethod cannot back out of once entered.
1234 // No need for fencing either.
1235 return false;
1236 }
1237
1238 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1239 nmethodLocker nml(this);
1240 methodHandle the_method(method());
1241 // This can be called while the system is already at a safepoint which is ok
1242 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1243
1244 // during patching, depending on the nmethod state we must notify the GC that
1245 // code has been unloaded, unregistering it. We cannot do this right while
1246 // holding the Patching_lock because we need to use the CodeCache_lock. This
1247 // would be prone to deadlocks.
1248 // This flag is used to remember whether we need to later lock and unregister.
1249 bool nmethod_needs_unregister = false;
1250
1251 {
1252 // invalidate osr nmethod before acquiring the patching lock since
1253 // they both acquire leaf locks and we don't want a deadlock.
1254 // This logic is equivalent to the logic below for patching the
1255 // verified entry point of regular methods. We check that the
1256 // nmethod is in use to ensure that it is invalidated only once.
1257 if (is_osr_method() && is_in_use()) {
1258 // this effectively makes the osr nmethod not entrant
1259 invalidate_osr_method();
1260 }
1261
1262 // Enter critical section. Does not block for safepoint.
1263 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1264
1265 if (_state == state) {
1266 // another thread already performed this transition so nothing
1267 // to do, but return false to indicate this.
1268 return false;
1269 }
1270
1271 // The caller can be calling the method statically or through an inline
1272 // cache call.
1273 if (!is_osr_method() && !is_not_entrant()) {
1274 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1275 SharedRuntime::get_handle_wrong_method_stub());
1276 }
1277
1278 if (is_in_use() && update_recompile_counts()) {
1279 // It's a true state change, so mark the method as decompiled.
1280 // Do it only for transition from alive.
1281 inc_decompile_count();
1282 }
1283
1284 // If the state is becoming a zombie, signal to unregister the nmethod with
1285 // the heap.
1286 // This nmethod may have already been unloaded during a full GC.
1287 if ((state == zombie) && !is_unloaded()) {
1288 nmethod_needs_unregister = true;
1289 }
1290
1291 // Must happen before state change. Otherwise we have a race condition in
1292 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1293 // transition its state from 'not_entrant' to 'zombie' without having to wait
1294 // for stack scanning.
1295 if (state == not_entrant) {
1296 mark_as_seen_on_stack();
1297 OrderAccess::storestore(); // _stack_traversal_mark and _state
1298 }
1299
1300 // Change state
1301 _state = state;
1302
1303 // Log the transition once
1304 log_state_change();
1305
1306 // Remove nmethod from method.
1307 unlink_from_method(false /* already owns Patching_lock */);
1308 } // leave critical region under Patching_lock
1309
1310 #if INCLUDE_JVMCI
1311 // Invalidate can't occur while holding the Patching lock
1312 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1313 if (nmethod_data != NULL) {
1314 nmethod_data->invalidate_nmethod_mirror(this);
1315 }
1316 #endif
1317
1318 #ifdef ASSERT
1319 if (is_osr_method() && method() != NULL) {
1320 // Make sure osr nmethod is invalidated, i.e. not on the list
1321 bool found = method()->method_holder()->remove_osr_nmethod(this);
1322 assert(!found, "osr nmethod should have been invalidated");
1323 }
1324 #endif
1325
1326 // When the nmethod becomes zombie it is no longer alive so the
1327 // dependencies must be flushed. nmethods in the not_entrant
1328 // state will be flushed later when the transition to zombie
1329 // happens or they get unloaded.
1330 if (state == zombie) {
1331 {
1332 // Flushing dependencies must be done before any possible
1333 // safepoint can sneak in, otherwise the oops used by the
1334 // dependency logic could have become stale.
1335 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1336 if (nmethod_needs_unregister) {
1337 Universe::heap()->unregister_nmethod(this);
1338 }
1339 flush_dependencies(/*delete_immediately*/true);
1340 }
1341
1342 #if INCLUDE_JVMCI
1343 // Now that the nmethod has been unregistered, it's
1344 // safe to clear the HotSpotNmethod mirror oop.
1345 if (nmethod_data != NULL) {
1346 nmethod_data->clear_nmethod_mirror(this);
1347 }
1348 #endif
1349
1350 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1351 // nmethods during the next safepoint (see ICStub::finalize), as well
1352 // as to free up CompiledICHolder resources.
1353 {
1354 CompiledICLocker ml(this);
1355 clear_ic_callsites();
1356 }
1357
1358 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1359 // event and it hasn't already been reported for this nmethod then
1360 // report it now. The event may have been reported earlier if the GC
1361 // marked it for unloading). JvmtiDeferredEventQueue support means
1362 // we no longer go to a safepoint here.
1363 post_compiled_method_unload();
1364
1365 #ifdef ASSERT
1366 // It's no longer safe to access the oops section since zombie
1367 // nmethods aren't scanned for GC.
1368 _oops_are_stale = true;
1369 #endif
1370 // the Method may be reclaimed by class unloading now that the
1371 // nmethod is in zombie state
1372 set_method(NULL);
1373 } else {
1374 assert(state == not_entrant, "other cases may need to be handled differently");
1375 }
1376
1377 if (TraceCreateZombies && state == zombie) {
1378 ResourceMark m;
1379 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");
1380 }
1381
1382 NMethodSweeper::report_state_change(this);
1383 return true;
1384 }
1385
1386 void nmethod::flush() {
1387 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1388 // Note that there are no valid oops in the nmethod anymore.
1389 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1390 "osr nmethod must be unloaded or zombie before flushing");
1391 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1392 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1393 assert_locked_or_safepoint(CodeCache_lock);
1394
1395 // completely deallocate this method
1396 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1397 if (PrintMethodFlushing) {
1398 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1399 "/Free CodeCache:" SIZE_FORMAT "Kb",
1400 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1401 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1402 }
1403
1404 // We need to deallocate any ExceptionCache data.
1405 // Note that we do not need to grab the nmethod lock for this, it
1406 // better be thread safe if we're disposing of it!
1407 ExceptionCache* ec = exception_cache();
1408 set_exception_cache(NULL);
1409 while(ec != NULL) {
1410 ExceptionCache* next = ec->next();
1411 delete ec;
1412 ec = next;
1413 }
1414
1415 Universe::heap()->flush_nmethod(this);
1416 CodeCache::unregister_old_nmethod(this);
1417
1418 CodeBlob::flush();
1419 CodeCache::free(this);
1420 }
1421
1422 oop nmethod::oop_at(int index) const {
1423 if (index == 0) {
1424 return NULL;
1425 }
1426 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1427 }
1428
1429 //
1430 // Notify all classes this nmethod is dependent on that it is no
1431 // longer dependent. This should only be called in two situations.
1432 // First, when a nmethod transitions to a zombie all dependents need
1433 // to be clear. Since zombification happens at a safepoint there's no
1434 // synchronization issues. The second place is a little more tricky.
1435 // During phase 1 of mark sweep class unloading may happen and as a
1436 // result some nmethods may get unloaded. In this case the flushing
1437 // of dependencies must happen during phase 1 since after GC any
1438 // dependencies in the unloaded nmethod won't be updated, so
1439 // traversing the dependency information in unsafe. In that case this
1440 // function is called with a boolean argument and this function only
1441 // notifies instanceKlasses that are reachable
1442
1443 void nmethod::flush_dependencies(bool delete_immediately) {
1444 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1445 assert(called_by_gc != delete_immediately,
1446 "delete_immediately is false if and only if we are called during GC");
1447 if (!has_flushed_dependencies()) {
1448 set_has_flushed_dependencies();
1449 for (Dependencies::DepStream deps(this); deps.next(); ) {
1450 if (deps.type() == Dependencies::call_site_target_value) {
1451 // CallSite dependencies are managed on per-CallSite instance basis.
1452 oop call_site = deps.argument_oop(0);
1453 if (delete_immediately) {
1454 assert_locked_or_safepoint(CodeCache_lock);
1455 MethodHandles::remove_dependent_nmethod(call_site, this);
1456 } else {
1457 MethodHandles::clean_dependency_context(call_site);
1458 }
1459 } else {
1460 Klass* klass = deps.context_type();
1461 if (klass == NULL) {
1462 continue; // ignore things like evol_method
1463 }
1464 // During GC delete_immediately is false, and liveness
1465 // of dependee determines class that needs to be updated.
1466 if (delete_immediately) {
1467 assert_locked_or_safepoint(CodeCache_lock);
1468 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1469 } else if (klass->is_loader_alive()) {
1470 // The GC may clean dependency contexts concurrently and in parallel.
1471 InstanceKlass::cast(klass)->clean_dependency_context();
1472 }
1473 }
1474 }
1475 }
1476 }
1477
1478 // ------------------------------------------------------------------
1479 // post_compiled_method_load_event
1480 // new method for install_code() path
1481 // Transfer information from compilation to jvmti
1482 void nmethod::post_compiled_method_load_event() {
1483
1484 Method* moop = method();
1485 HOTSPOT_COMPILED_METHOD_LOAD(
1486 (char *) moop->klass_name()->bytes(),
1487 moop->klass_name()->utf8_length(),
1488 (char *) moop->name()->bytes(),
1489 moop->name()->utf8_length(),
1490 (char *) moop->signature()->bytes(),
1491 moop->signature()->utf8_length(),
1492 insts_begin(), insts_size());
1493
1494 if (JvmtiExport::should_post_compiled_method_load() ||
1495 JvmtiExport::should_post_compiled_method_unload()) {
1496 get_and_cache_jmethod_id();
1497 }
1498
1499 if (JvmtiExport::should_post_compiled_method_load()) {
1500 // Let the Service thread (which is a real Java thread) post the event
1501 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1502 JvmtiDeferredEventQueue::enqueue(
1503 JvmtiDeferredEvent::compiled_method_load_event(this));
1504 }
1505 }
1506
1507 jmethodID nmethod::get_and_cache_jmethod_id() {
1508 if (_jmethod_id == NULL) {
1509 // Cache the jmethod_id since it can no longer be looked up once the
1510 // method itself has been marked for unloading.
1511 _jmethod_id = method()->jmethod_id();
1512 }
1513 return _jmethod_id;
1514 }
1515
1516 void nmethod::post_compiled_method_unload() {
1517 if (unload_reported()) {
1518 // During unloading we transition to unloaded and then to zombie
1519 // and the unloading is reported during the first transition.
1520 return;
1521 }
1522
1523 assert(_method != NULL && !is_unloaded(), "just checking");
1524 DTRACE_METHOD_UNLOAD_PROBE(method());
1525
1526 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1527 // post the event. Sometime later this nmethod will be made a zombie
1528 // by the sweeper but the Method* will not be valid at that point.
1529 // If the _jmethod_id is null then no load event was ever requested
1530 // so don't bother posting the unload. The main reason for this is
1531 // that the jmethodID is a weak reference to the Method* so if
1532 // it's being unloaded there's no way to look it up since the weak
1533 // ref will have been cleared.
1534 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1535 assert(!unload_reported(), "already unloaded");
1536 JvmtiDeferredEvent event =
1537 JvmtiDeferredEvent::compiled_method_unload_event(this,
1538 _jmethod_id, insts_begin());
1539 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1540 JvmtiDeferredEventQueue::enqueue(event);
1541 }
1542
1543 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1544 // any time. As the nmethod is being unloaded now we mark it has
1545 // having the unload event reported - this will ensure that we don't
1546 // attempt to report the event in the unlikely scenario where the
1547 // event is enabled at the time the nmethod is made a zombie.
1548 set_unload_reported();
1549 }
1550
1551 // Iterate over metadata calling this function. Used by RedefineClasses
1552 void nmethod::metadata_do(MetadataClosure* f) {
1553 {
1554 // Visit all immediate references that are embedded in the instruction stream.
1555 RelocIterator iter(this, oops_reloc_begin());
1556 while (iter.next()) {
1557 if (iter.type() == relocInfo::metadata_type) {
1558 metadata_Relocation* r = iter.metadata_reloc();
1559 // In this metadata, we must only follow those metadatas directly embedded in
1560 // the code. Other metadatas (oop_index>0) are seen as part of
1561 // the metadata section below.
1562 assert(1 == (r->metadata_is_immediate()) +
1563 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1564 "metadata must be found in exactly one place");
1565 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1566 Metadata* md = r->metadata_value();
1567 if (md != _method) f->do_metadata(md);
1568 }
1569 } else if (iter.type() == relocInfo::virtual_call_type) {
1570 // Check compiledIC holders associated with this nmethod
1571 ResourceMark rm;
1572 CompiledIC *ic = CompiledIC_at(&iter);
1573 if (ic->is_icholder_call()) {
1574 CompiledICHolder* cichk = ic->cached_icholder();
1575 f->do_metadata(cichk->holder_metadata());
1576 f->do_metadata(cichk->holder_klass());
1577 } else {
1578 Metadata* ic_oop = ic->cached_metadata();
1579 if (ic_oop != NULL) {
1580 f->do_metadata(ic_oop);
1581 }
1582 }
1583 }
1584 }
1585 }
1586
1587 // Visit the metadata section
1588 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1589 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1590 Metadata* md = *p;
1591 f->do_metadata(md);
1592 }
1593
1594 // Visit metadata not embedded in the other places.
1595 if (_method != NULL) f->do_metadata(_method);
1596 }
1597
1598 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1599 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1600 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1601 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1602 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1603
1604 class IsUnloadingState: public AllStatic {
1605 static const uint8_t _is_unloading_mask = 1;
1606 static const uint8_t _is_unloading_shift = 0;
1607 static const uint8_t _unloading_cycle_mask = 6;
1608 static const uint8_t _unloading_cycle_shift = 1;
1609
1610 static uint8_t set_is_unloading(uint8_t state, bool value) {
1611 state &= ~_is_unloading_mask;
1612 if (value) {
1613 state |= 1 << _is_unloading_shift;
1614 }
1615 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1616 return state;
1617 }
1618
1619 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1620 state &= ~_unloading_cycle_mask;
1621 state |= value << _unloading_cycle_shift;
1622 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1623 return state;
1624 }
1625
1626 public:
1627 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1628 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1629
1630 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1631 uint8_t state = 0;
1632 state = set_is_unloading(state, is_unloading);
1633 state = set_unloading_cycle(state, unloading_cycle);
1634 return state;
1635 }
1636 };
1637
1638 bool nmethod::is_unloading() {
1639 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1640 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1641 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1642 if (state_is_unloading) {
1643 return true;
1644 }
1645 uint8_t current_cycle = CodeCache::unloading_cycle();
1646 if (state_unloading_cycle == current_cycle) {
1647 return false;
1648 }
1649
1650 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1651 // oops in the CompiledMethod, by calling oops_do on it.
1652 state_unloading_cycle = current_cycle;
1653
1654 if (is_zombie()) {
1655 // Zombies without calculated unloading epoch are never unloading due to GC.
1656
1657 // There are no races where a previously observed is_unloading() nmethod
1658 // suddenly becomes not is_unloading() due to here being observed as zombie.
1659
1660 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1661 // and unloaded in the safepoint. That makes races where an nmethod is first
1662 // observed as is_alive() && is_unloading() and subsequently observed as
1663 // is_zombie() impossible.
1664
1665 // With concurrent unloading, all references to is_unloading() nmethods are
1666 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1667 // handshake operation is performed with all JavaThreads before finally
1668 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1669 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1670 // the global handshake, it is impossible for is_unloading() nmethods to
1671 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1672 // nmethods before taking that global handshake, meaning that it will never
1673 // be recalculated after the handshake.
1674
1675 // After that global handshake, is_unloading() nmethods are only observable
1676 // to the iterators, and they will never trigger recomputation of the cached
1677 // is_unloading_state, and hence may not suffer from such races.
1678
1679 state_is_unloading = false;
1680 } else {
1681 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1682 }
1683
1684 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1685
1686 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1687
1688 return state_is_unloading;
1689 }
1690
1691 void nmethod::clear_unloading_state() {
1692 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1693 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1694 }
1695
1696
1697 // This is called at the end of the strong tracing/marking phase of a
1698 // GC to unload an nmethod if it contains otherwise unreachable
1699 // oops.
1700
1701 void nmethod::do_unloading(bool unloading_occurred) {
1702 // Make sure the oop's ready to receive visitors
1703 assert(!is_zombie() && !is_unloaded(),
1704 "should not call follow on zombie or unloaded nmethod");
1705
1706 if (is_unloading()) {
1707 make_unloaded();
1708 } else {
1709 guarantee(unload_nmethod_caches(unloading_occurred),
1710 "Should not need transition stubs");
1711 }
1712 }
1713
1714 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1715 // make sure the oops ready to receive visitors
1716 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1717 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1718
1719 // Prevent extra code cache walk for platforms that don't have immediate oops.
1720 if (relocInfo::mustIterateImmediateOopsInCode()) {
1721 RelocIterator iter(this, oops_reloc_begin());
1722
1723 while (iter.next()) {
1724 if (iter.type() == relocInfo::oop_type ) {
1725 oop_Relocation* r = iter.oop_reloc();
1726 // In this loop, we must only follow those oops directly embedded in
1727 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1728 assert(1 == (r->oop_is_immediate()) +
1729 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1730 "oop must be found in exactly one place");
1731 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1732 f->do_oop(r->oop_addr());
1733 }
1734 }
1735 }
1736 }
1737
1738 // Scopes
1739 // This includes oop constants not inlined in the code stream.
1740 for (oop* p = oops_begin(); p < oops_end(); p++) {
1741 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1742 f->do_oop(p);
1743 }
1744 }
1745
1746 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1747
1748 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1749
1750 // An nmethod is "marked" if its _mark_link is set non-null.
1751 // Even if it is the end of the linked list, it will have a non-null link value,
1752 // as long as it is on the list.
1753 // This code must be MP safe, because it is used from parallel GC passes.
1754 bool nmethod::test_set_oops_do_mark() {
1755 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1756 if (_oops_do_mark_link == NULL) {
1757 // Claim this nmethod for this thread to mark.
1758 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1759 // Atomically append this nmethod (now claimed) to the head of the list:
1760 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1761 for (;;) {
1762 nmethod* required_mark_nmethods = observed_mark_nmethods;
1763 _oops_do_mark_link = required_mark_nmethods;
1764 observed_mark_nmethods =
1765 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1766 if (observed_mark_nmethods == required_mark_nmethods)
1767 break;
1768 }
1769 // Mark was clear when we first saw this guy.
1770 LogTarget(Trace, gc, nmethod) lt;
1771 if (lt.is_enabled()) {
1772 LogStream ls(lt);
1773 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1774 }
1775 return false;
1776 }
1777 }
1778 // On fall through, another racing thread marked this nmethod before we did.
1779 return true;
1780 }
1781
1782 void nmethod::oops_do_marking_prologue() {
1783 log_trace(gc, nmethod)("oops_do_marking_prologue");
1784 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1785 // We use cmpxchg instead of regular assignment here because the user
1786 // may fork a bunch of threads, and we need them all to see the same state.
1787 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1788 guarantee(observed == NULL, "no races in this sequential code");
1789 }
1790
1791 void nmethod::oops_do_marking_epilogue() {
1792 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1793 nmethod* cur = _oops_do_mark_nmethods;
1794 while (cur != NMETHOD_SENTINEL) {
1795 assert(cur != NULL, "not NULL-terminated");
1796 nmethod* next = cur->_oops_do_mark_link;
1797 cur->_oops_do_mark_link = NULL;
1798 DEBUG_ONLY(cur->verify_oop_relocations());
1799
1800 LogTarget(Trace, gc, nmethod) lt;
1801 if (lt.is_enabled()) {
1802 LogStream ls(lt);
1803 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1804 }
1805 cur = next;
1806 }
1807 nmethod* required = _oops_do_mark_nmethods;
1808 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1809 guarantee(observed == required, "no races in this sequential code");
1810 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1811 }
1812
1813 inline bool includes(void* p, void* from, void* to) {
1814 return from <= p && p < to;
1815 }
1816
1817
1818 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1819 assert(count >= 2, "must be sentinel values, at least");
1820
1821 #ifdef ASSERT
1822 // must be sorted and unique; we do a binary search in find_pc_desc()
1823 int prev_offset = pcs[0].pc_offset();
1824 assert(prev_offset == PcDesc::lower_offset_limit,
1825 "must start with a sentinel");
1826 for (int i = 1; i < count; i++) {
1827 int this_offset = pcs[i].pc_offset();
1828 assert(this_offset > prev_offset, "offsets must be sorted");
1829 prev_offset = this_offset;
1830 }
1831 assert(prev_offset == PcDesc::upper_offset_limit,
1832 "must end with a sentinel");
1833 #endif //ASSERT
1834
1835 // Search for MethodHandle invokes and tag the nmethod.
1836 for (int i = 0; i < count; i++) {
1837 if (pcs[i].is_method_handle_invoke()) {
1838 set_has_method_handle_invokes(true);
1839 break;
1840 }
1841 }
1842 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1843
1844 int size = count * sizeof(PcDesc);
1845 assert(scopes_pcs_size() >= size, "oob");
1846 memcpy(scopes_pcs_begin(), pcs, size);
1847
1848 // Adjust the final sentinel downward.
1849 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1850 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1851 last_pc->set_pc_offset(content_size() + 1);
1852 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1853 // Fill any rounding gaps with copies of the last record.
1854 last_pc[1] = last_pc[0];
1855 }
1856 // The following assert could fail if sizeof(PcDesc) is not
1857 // an integral multiple of oopSize (the rounding term).
1858 // If it fails, change the logic to always allocate a multiple
1859 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1860 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1861 }
1862
1863 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1864 assert(scopes_data_size() >= size, "oob");
1865 memcpy(scopes_data_begin(), buffer, size);
1866 }
1867
1868 #ifdef ASSERT
1869 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1870 PcDesc* lower = search.scopes_pcs_begin();
1871 PcDesc* upper = search.scopes_pcs_end();
1872 lower += 1; // exclude initial sentinel
1873 PcDesc* res = NULL;
1874 for (PcDesc* p = lower; p < upper; p++) {
1875 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1876 if (match_desc(p, pc_offset, approximate)) {
1877 if (res == NULL)
1878 res = p;
1879 else
1880 res = (PcDesc*) badAddress;
1881 }
1882 }
1883 return res;
1884 }
1885 #endif
1886
1887
1888 // Finds a PcDesc with real-pc equal to "pc"
1889 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1890 address base_address = search.code_begin();
1891 if ((pc < base_address) ||
1892 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1893 return NULL; // PC is wildly out of range
1894 }
1895 int pc_offset = (int) (pc - base_address);
1896
1897 // Check the PcDesc cache if it contains the desired PcDesc
1898 // (This as an almost 100% hit rate.)
1899 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1900 if (res != NULL) {
1901 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1902 return res;
1903 }
1904
1905 // Fallback algorithm: quasi-linear search for the PcDesc
1906 // Find the last pc_offset less than the given offset.
1907 // The successor must be the required match, if there is a match at all.
1908 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1909 PcDesc* lower = search.scopes_pcs_begin();
1910 PcDesc* upper = search.scopes_pcs_end();
1911 upper -= 1; // exclude final sentinel
1912 if (lower >= upper) return NULL; // native method; no PcDescs at all
1913
1914 #define assert_LU_OK \
1915 /* invariant on lower..upper during the following search: */ \
1916 assert(lower->pc_offset() < pc_offset, "sanity"); \
1917 assert(upper->pc_offset() >= pc_offset, "sanity")
1918 assert_LU_OK;
1919
1920 // Use the last successful return as a split point.
1921 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1922 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1923 if (mid->pc_offset() < pc_offset) {
1924 lower = mid;
1925 } else {
1926 upper = mid;
1927 }
1928
1929 // Take giant steps at first (4096, then 256, then 16, then 1)
1930 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1931 const int RADIX = (1 << LOG2_RADIX);
1932 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1933 while ((mid = lower + step) < upper) {
1934 assert_LU_OK;
1935 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1936 if (mid->pc_offset() < pc_offset) {
1937 lower = mid;
1938 } else {
1939 upper = mid;
1940 break;
1941 }
1942 }
1943 assert_LU_OK;
1944 }
1945
1946 // Sneak up on the value with a linear search of length ~16.
1947 while (true) {
1948 assert_LU_OK;
1949 mid = lower + 1;
1950 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1951 if (mid->pc_offset() < pc_offset) {
1952 lower = mid;
1953 } else {
1954 upper = mid;
1955 break;
1956 }
1957 }
1958 #undef assert_LU_OK
1959
1960 if (match_desc(upper, pc_offset, approximate)) {
1961 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1962 _pc_desc_cache.add_pc_desc(upper);
1963 return upper;
1964 } else {
1965 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1966 return NULL;
1967 }
1968 }
1969
1970
1971 void nmethod::check_all_dependencies(DepChange& changes) {
1972 // Checked dependencies are allocated into this ResourceMark
1973 ResourceMark rm;
1974
1975 // Turn off dependency tracing while actually testing dependencies.
1976 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1977
1978 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1979 &DependencySignature::equals, 11027> DepTable;
1980
1981 DepTable* table = new DepTable();
1982
1983 // Iterate over live nmethods and check dependencies of all nmethods that are not
1984 // marked for deoptimization. A particular dependency is only checked once.
1985 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1986 while(iter.next()) {
1987 nmethod* nm = iter.method();
1988 // Only notify for live nmethods
1989 if (!nm->is_marked_for_deoptimization()) {
1990 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1991 // Construct abstraction of a dependency.
1992 DependencySignature* current_sig = new DependencySignature(deps);
1993
1994 // Determine if dependency is already checked. table->put(...) returns
1995 // 'true' if the dependency is added (i.e., was not in the hashtable).
1996 if (table->put(*current_sig, 1)) {
1997 if (deps.check_dependency() != NULL) {
1998 // Dependency checking failed. Print out information about the failed
1999 // dependency and finally fail with an assert. We can fail here, since
2000 // dependency checking is never done in a product build.
2001 tty->print_cr("Failed dependency:");
2002 changes.print();
2003 nm->print();
2004 nm->print_dependencies();
2005 assert(false, "Should have been marked for deoptimization");
2006 }
2007 }
2008 }
2009 }
2010 }
2011 }
2012
2013 bool nmethod::check_dependency_on(DepChange& changes) {
2014 // What has happened:
2015 // 1) a new class dependee has been added
2016 // 2) dependee and all its super classes have been marked
2017 bool found_check = false; // set true if we are upset
2018 for (Dependencies::DepStream deps(this); deps.next(); ) {
2019 // Evaluate only relevant dependencies.
2020 if (deps.spot_check_dependency_at(changes) != NULL) {
2021 found_check = true;
2022 NOT_DEBUG(break);
2023 }
2024 }
2025 return found_check;
2026 }
2027
2028 // Called from mark_for_deoptimization, when dependee is invalidated.
2029 bool nmethod::is_dependent_on_method(Method* dependee) {
2030 for (Dependencies::DepStream deps(this); deps.next(); ) {
2031 if (deps.type() != Dependencies::evol_method)
2032 continue;
2033 Method* method = deps.method_argument(0);
2034 if (method == dependee) return true;
2035 }
2036 return false;
2037 }
2038
2039
2040 bool nmethod::is_patchable_at(address instr_addr) {
2041 assert(insts_contains(instr_addr), "wrong nmethod used");
2042 if (is_zombie()) {
2043 // a zombie may never be patched
2044 return false;
2045 }
2046 return true;
2047 }
2048
2049
2050 address nmethod::continuation_for_implicit_exception(address pc) {
2051 // Exception happened outside inline-cache check code => we are inside
2052 // an active nmethod => use cpc to determine a return address
2053 int exception_offset = pc - code_begin();
2054 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2055 #ifdef ASSERT
2056 if (cont_offset == 0) {
2057 Thread* thread = Thread::current();
2058 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2059 HandleMark hm(thread);
2060 ResourceMark rm(thread);
2061 CodeBlob* cb = CodeCache::find_blob(pc);
2062 assert(cb != NULL && cb == this, "");
2063 ttyLocker ttyl;
2064 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2065 print();
2066 method()->print_codes();
2067 print_code();
2068 print_pcs();
2069 }
2070 #endif
2071 if (cont_offset == 0) {
2072 // Let the normal error handling report the exception
2073 return NULL;
2074 }
2075 return code_begin() + cont_offset;
2076 }
2077
2078
2079
2080 void nmethod_init() {
2081 // make sure you didn't forget to adjust the filler fields
2082 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2083 }
2084
2085
2086 //-------------------------------------------------------------------------------------------
2087
2088
2089 // QQQ might we make this work from a frame??
2090 nmethodLocker::nmethodLocker(address pc) {
2091 CodeBlob* cb = CodeCache::find_blob(pc);
2092 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2093 _nm = cb->as_compiled_method();
2094 lock_nmethod(_nm);
2095 }
2096
2097 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2098 // should pass zombie_ok == true.
2099 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
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::inc(&nm->_lock_count);
2104 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2105 }
2106
2107 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2108 if (cm == NULL) return;
2109 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2110 nmethod* nm = cm->as_nmethod();
2111 Atomic::dec(&nm->_lock_count);
2112 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2113 }
2114
2115
2116 // -----------------------------------------------------------------------------
2117 // Verification
2118
2119 class VerifyOopsClosure: public OopClosure {
2120 nmethod* _nm;
2121 bool _ok;
2122 public:
2123 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2124 bool ok() { return _ok; }
2125 virtual void do_oop(oop* p) {
2126 if (oopDesc::is_oop_or_null(*p)) return;
2127 if (_ok) {
2128 _nm->print_nmethod(true);
2129 _ok = false;
2130 }
2131 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2132 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2133 }
2134 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2135 };
2136
2137 void nmethod::verify() {
2138
2139 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2140 // seems odd.
2141
2142 if (is_zombie() || is_not_entrant() || is_unloaded())
2143 return;
2144
2145 // Make sure all the entry points are correctly aligned for patching.
2146 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2147
2148 // assert(oopDesc::is_oop(method()), "must be valid");
2149
2150 ResourceMark rm;
2151
2152 if (!CodeCache::contains(this)) {
2153 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2154 }
2155
2156 if(is_native_method() )
2157 return;
2158
2159 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2160 if (nm != this) {
2161 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2162 }
2163
2164 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2165 if (! p->verify(this)) {
2166 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2167 }
2168 }
2169
2170 VerifyOopsClosure voc(this);
2171 oops_do(&voc);
2172 assert(voc.ok(), "embedded oops must be OK");
2173 Universe::heap()->verify_nmethod(this);
2174
2175 verify_scopes();
2176 }
2177
2178
2179 void nmethod::verify_interrupt_point(address call_site) {
2180 // Verify IC only when nmethod installation is finished.
2181 if (!is_not_installed()) {
2182 if (CompiledICLocker::is_safe(this)) {
2183 CompiledIC_at(this, call_site);
2184 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2185 } else {
2186 CompiledICLocker ml_verify(this);
2187 CompiledIC_at(this, call_site);
2188 }
2189 }
2190
2191 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2192 assert(pd != NULL, "PcDesc must exist");
2193 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2194 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2195 pd->return_oop());
2196 !sd->is_top(); sd = sd->sender()) {
2197 sd->verify();
2198 }
2199 }
2200
2201 void nmethod::verify_scopes() {
2202 if( !method() ) return; // Runtime stubs have no scope
2203 if (method()->is_native()) return; // Ignore stub methods.
2204 // iterate through all interrupt point
2205 // and verify the debug information is valid.
2206 RelocIterator iter((nmethod*)this);
2207 while (iter.next()) {
2208 address stub = NULL;
2209 switch (iter.type()) {
2210 case relocInfo::virtual_call_type:
2211 verify_interrupt_point(iter.addr());
2212 break;
2213 case relocInfo::opt_virtual_call_type:
2214 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2215 verify_interrupt_point(iter.addr());
2216 break;
2217 case relocInfo::static_call_type:
2218 stub = iter.static_call_reloc()->static_stub(false);
2219 //verify_interrupt_point(iter.addr());
2220 break;
2221 case relocInfo::runtime_call_type:
2222 case relocInfo::runtime_call_w_cp_type: {
2223 address destination = iter.reloc()->value();
2224 // Right now there is no way to find out which entries support
2225 // an interrupt point. It would be nice if we had this
2226 // information in a table.
2227 break;
2228 }
2229 default:
2230 break;
2231 }
2232 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2233 }
2234 }
2235
2236
2237 // -----------------------------------------------------------------------------
2238 // Printing operations
2239
2240 void nmethod::print() const {
2241 ResourceMark rm;
2242 ttyLocker ttyl; // keep the following output all in one block
2243
2244 tty->print("Compiled method ");
2245
2246 if (is_compiled_by_c1()) {
2247 tty->print("(c1) ");
2248 } else if (is_compiled_by_c2()) {
2249 tty->print("(c2) ");
2250 } else if (is_compiled_by_jvmci()) {
2251 tty->print("(JVMCI) ");
2252 } else {
2253 tty->print("(nm) ");
2254 }
2255
2256 print_on(tty, NULL);
2257
2258 if (WizardMode) {
2259 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2260 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2261 tty->print(" { ");
2262 tty->print_cr("%s ", state());
2263 tty->print_cr("}:");
2264 }
2265 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(this),
2267 p2i(this) + size(),
2268 size());
2269 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(relocation_begin()),
2271 p2i(relocation_end()),
2272 relocation_size());
2273 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(consts_begin()),
2275 p2i(consts_end()),
2276 consts_size());
2277 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(insts_begin()),
2279 p2i(insts_end()),
2280 insts_size());
2281 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 p2i(stub_begin()),
2283 p2i(stub_end()),
2284 stub_size());
2285 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 p2i(oops_begin()),
2287 p2i(oops_end()),
2288 oops_size());
2289 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(metadata_begin()),
2291 p2i(metadata_end()),
2292 metadata_size());
2293 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(scopes_data_begin()),
2295 p2i(scopes_data_end()),
2296 scopes_data_size());
2297 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 p2i(scopes_pcs_begin()),
2299 p2i(scopes_pcs_end()),
2300 scopes_pcs_size());
2301 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2302 p2i(dependencies_begin()),
2303 p2i(dependencies_end()),
2304 dependencies_size());
2305 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2306 p2i(handler_table_begin()),
2307 p2i(handler_table_end()),
2308 handler_table_size());
2309 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2310 p2i(nul_chk_table_begin()),
2311 p2i(nul_chk_table_end()),
2312 nul_chk_table_size());
2313 #if INCLUDE_JVMCI
2314 if (speculations_size () > 0) tty->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2315 p2i(speculations_begin()),
2316 p2i(speculations_end()),
2317 speculations_size());
2318 if (jvmci_data_size () > 0) tty->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2319 p2i(jvmci_data_begin()),
2320 p2i(jvmci_data_end()),
2321 jvmci_data_size());
2322 #endif
2323 }
2324
2325 #ifndef PRODUCT
2326
2327 void nmethod::print_scopes() {
2328 // Find the first pc desc for all scopes in the code and print it.
2329 ResourceMark rm;
2330 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2331 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2332 continue;
2333
2334 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2335 while (sd != NULL) {
2336 sd->print_on(tty, p);
2337 sd = sd->sender();
2338 }
2339 }
2340 }
2341
2342 void nmethod::print_dependencies() {
2343 ResourceMark rm;
2344 ttyLocker ttyl; // keep the following output all in one block
2345 tty->print_cr("Dependencies:");
2346 for (Dependencies::DepStream deps(this); deps.next(); ) {
2347 deps.print_dependency();
2348 Klass* ctxk = deps.context_type();
2349 if (ctxk != NULL) {
2350 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2351 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2352 }
2353 }
2354 deps.log_dependency(); // put it into the xml log also
2355 }
2356 }
2357
2358
2359 void nmethod::print_relocations() {
2360 ResourceMark m; // in case methods get printed via the debugger
2361 tty->print_cr("relocations:");
2362 RelocIterator iter(this);
2363 iter.print();
2364 }
2365
2366
2367 void nmethod::print_pcs() {
2368 ResourceMark m; // in case methods get printed via debugger
2369 tty->print_cr("pc-bytecode offsets:");
2370 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2371 p->print(this);
2372 }
2373 }
2374
2375 void nmethod::print_recorded_oops() {
2376 tty->print_cr("Recorded oops:");
2377 for (int i = 0; i < oops_count(); i++) {
2378 oop o = oop_at(i);
2379 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2380 if (o == Universe::non_oop_word()) {
2381 tty->print("non-oop word");
2382 } else {
2383 if (o != NULL) {
2384 o->print_value();
2385 } else {
2386 tty->print_cr("NULL");
2387 }
2388 }
2389 tty->cr();
2390 }
2391 }
2392
2393 void nmethod::print_recorded_metadata() {
2394 tty->print_cr("Recorded metadata:");
2395 for (int i = 0; i < metadata_count(); i++) {
2396 Metadata* m = metadata_at(i);
2397 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2398 if (m == (Metadata*)Universe::non_oop_word()) {
2399 tty->print("non-metadata word");
2400 } else {
2401 Metadata::print_value_on_maybe_null(tty, m);
2402 }
2403 tty->cr();
2404 }
2405 }
2406
2407 #endif // PRODUCT
2408
2409 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2410 RelocIterator iter(this, begin, end);
2411 bool have_one = false;
2412 while (iter.next()) {
2413 have_one = true;
2414 switch (iter.type()) {
2415 case relocInfo::none: return "no_reloc";
2416 case relocInfo::oop_type: {
2417 stringStream st;
2418 oop_Relocation* r = iter.oop_reloc();
2419 oop obj = r->oop_value();
2420 st.print("oop(");
2421 if (obj == NULL) st.print("NULL");
2422 else obj->print_value_on(&st);
2423 st.print(")");
2424 return st.as_string();
2425 }
2426 case relocInfo::metadata_type: {
2427 stringStream st;
2428 metadata_Relocation* r = iter.metadata_reloc();
2429 Metadata* obj = r->metadata_value();
2430 st.print("metadata(");
2431 if (obj == NULL) st.print("NULL");
2432 else obj->print_value_on(&st);
2433 st.print(")");
2434 return st.as_string();
2435 }
2436 case relocInfo::runtime_call_type:
2437 case relocInfo::runtime_call_w_cp_type: {
2438 stringStream st;
2439 st.print("runtime_call");
2440 CallRelocation* r = (CallRelocation*)iter.reloc();
2441 address dest = r->destination();
2442 CodeBlob* cb = CodeCache::find_blob(dest);
2443 if (cb != NULL) {
2444 st.print(" %s", cb->name());
2445 } else {
2446 ResourceMark rm;
2447 const int buflen = 1024;
2448 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2449 int offset;
2450 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2451 st.print(" %s", buf);
2452 if (offset != 0) {
2453 st.print("+%d", offset);
2454 }
2455 }
2456 }
2457 return st.as_string();
2458 }
2459 case relocInfo::virtual_call_type: {
2460 stringStream st;
2461 st.print_raw("virtual_call");
2462 virtual_call_Relocation* r = iter.virtual_call_reloc();
2463 Method* m = r->method_value();
2464 if (m != NULL) {
2465 assert(m->is_method(), "");
2466 m->print_short_name(&st);
2467 }
2468 return st.as_string();
2469 }
2470 case relocInfo::opt_virtual_call_type: {
2471 stringStream st;
2472 st.print_raw("optimized virtual_call");
2473 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2474 Method* m = r->method_value();
2475 if (m != NULL) {
2476 assert(m->is_method(), "");
2477 m->print_short_name(&st);
2478 }
2479 return st.as_string();
2480 }
2481 case relocInfo::static_call_type: {
2482 stringStream st;
2483 st.print_raw("static_call");
2484 static_call_Relocation* r = iter.static_call_reloc();
2485 Method* m = r->method_value();
2486 if (m != NULL) {
2487 assert(m->is_method(), "");
2488 m->print_short_name(&st);
2489 }
2490 return st.as_string();
2491 }
2492 case relocInfo::static_stub_type: return "static_stub";
2493 case relocInfo::external_word_type: return "external_word";
2494 case relocInfo::internal_word_type: return "internal_word";
2495 case relocInfo::section_word_type: return "section_word";
2496 case relocInfo::poll_type: return "poll";
2497 case relocInfo::poll_return_type: return "poll_return";
2498 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2499 case relocInfo::type_mask: return "type_bit_mask";
2500
2501 default:
2502 break;
2503 }
2504 }
2505 return have_one ? "other" : NULL;
2506 }
2507
2508 // Return a the last scope in (begin..end]
2509 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2510 PcDesc* p = pc_desc_near(begin+1);
2511 if (p != NULL && p->real_pc(this) <= end) {
2512 return new ScopeDesc(this, p->scope_decode_offset(),
2513 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2514 p->return_oop());
2515 }
2516 return NULL;
2517 }
2518
2519 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2520 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2521 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2522 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2523 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2524 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2525
2526 if (has_method_handle_invokes())
2527 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2528
2529 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2530
2531 if (block_begin == entry_point()) {
2532 methodHandle m = method();
2533 if (m.not_null()) {
2534 stream->print(" # ");
2535 m->print_value_on(stream);
2536 stream->cr();
2537 }
2538 if (m.not_null() && !is_osr_method()) {
2539 ResourceMark rm;
2540 int sizeargs = m->size_of_parameters();
2541 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2542 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2543 {
2544 int sig_index = 0;
2545 if (!m->is_static())
2546 sig_bt[sig_index++] = T_OBJECT; // 'this'
2547 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2548 BasicType t = ss.type();
2549 sig_bt[sig_index++] = t;
2550 if (type2size[t] == 2) {
2551 sig_bt[sig_index++] = T_VOID;
2552 } else {
2553 assert(type2size[t] == 1, "size is 1 or 2");
2554 }
2555 }
2556 assert(sig_index == sizeargs, "");
2557 }
2558 const char* spname = "sp"; // make arch-specific?
2559 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2560 int stack_slot_offset = this->frame_size() * wordSize;
2561 int tab1 = 14, tab2 = 24;
2562 int sig_index = 0;
2563 int arg_index = (m->is_static() ? 0 : -1);
2564 bool did_old_sp = false;
2565 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2566 bool at_this = (arg_index == -1);
2567 bool at_old_sp = false;
2568 BasicType t = (at_this ? T_OBJECT : ss.type());
2569 assert(t == sig_bt[sig_index], "sigs in sync");
2570 if (at_this)
2571 stream->print(" # this: ");
2572 else
2573 stream->print(" # parm%d: ", arg_index);
2574 stream->move_to(tab1);
2575 VMReg fst = regs[sig_index].first();
2576 VMReg snd = regs[sig_index].second();
2577 if (fst->is_reg()) {
2578 stream->print("%s", fst->name());
2579 if (snd->is_valid()) {
2580 stream->print(":%s", snd->name());
2581 }
2582 } else if (fst->is_stack()) {
2583 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2584 if (offset == stack_slot_offset) at_old_sp = true;
2585 stream->print("[%s+0x%x]", spname, offset);
2586 } else {
2587 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2588 }
2589 stream->print(" ");
2590 stream->move_to(tab2);
2591 stream->print("= ");
2592 if (at_this) {
2593 m->method_holder()->print_value_on(stream);
2594 } else {
2595 bool did_name = false;
2596 if (!at_this && ss.is_object()) {
2597 Symbol* name = ss.as_symbol_or_null();
2598 if (name != NULL) {
2599 name->print_value_on(stream);
2600 did_name = true;
2601 }
2602 }
2603 if (!did_name)
2604 stream->print("%s", type2name(t));
2605 }
2606 if (at_old_sp) {
2607 stream->print(" (%s of caller)", spname);
2608 did_old_sp = true;
2609 }
2610 stream->cr();
2611 sig_index += type2size[t];
2612 arg_index += 1;
2613 if (!at_this) ss.next();
2614 }
2615 if (!did_old_sp) {
2616 stream->print(" # ");
2617 stream->move_to(tab1);
2618 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2619 stream->print(" (%s of caller)", spname);
2620 stream->cr();
2621 }
2622 }
2623 }
2624 }
2625
2626 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2627 // First, find an oopmap in (begin, end].
2628 // We use the odd half-closed interval so that oop maps and scope descs
2629 // which are tied to the byte after a call are printed with the call itself.
2630 address base = code_begin();
2631 ImmutableOopMapSet* oms = oop_maps();
2632 if (oms != NULL) {
2633 for (int i = 0, imax = oms->count(); i < imax; i++) {
2634 const ImmutableOopMapPair* pair = oms->pair_at(i);
2635 const ImmutableOopMap* om = pair->get_from(oms);
2636 address pc = base + pair->pc_offset();
2637 if (pc > begin) {
2638 if (pc <= end) {
2639 st->move_to(column);
2640 st->print("; ");
2641 om->print_on(st);
2642 }
2643 break;
2644 }
2645 }
2646 }
2647
2648 // Print any debug info present at this pc.
2649 ScopeDesc* sd = scope_desc_in(begin, end);
2650 if (sd != NULL) {
2651 st->move_to(column);
2652 if (sd->bci() == SynchronizationEntryBCI) {
2653 st->print(";*synchronization entry");
2654 } else if (sd->bci() == AfterBci) {
2655 st->print(";* method exit (unlocked if synchronized)");
2656 } else if (sd->bci() == UnwindBci) {
2657 st->print(";* unwind (locked if synchronized)");
2658 } else if (sd->bci() == AfterExceptionBci) {
2659 st->print(";* unwind (unlocked if synchronized)");
2660 } else if (sd->bci() == UnknownBci) {
2661 st->print(";* unknown");
2662 } else if (sd->bci() == InvalidFrameStateBci) {
2663 st->print(";* invalid frame state");
2664 } else {
2665 if (sd->method() == NULL) {
2666 st->print("method is NULL");
2667 } else if (sd->method()->is_native()) {
2668 st->print("method is native");
2669 } else {
2670 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2671 st->print(";*%s", Bytecodes::name(bc));
2672 switch (bc) {
2673 case Bytecodes::_invokevirtual:
2674 case Bytecodes::_invokespecial:
2675 case Bytecodes::_invokestatic:
2676 case Bytecodes::_invokeinterface:
2677 {
2678 Bytecode_invoke invoke(sd->method(), sd->bci());
2679 st->print(" ");
2680 if (invoke.name() != NULL)
2681 invoke.name()->print_symbol_on(st);
2682 else
2683 st->print("<UNKNOWN>");
2684 break;
2685 }
2686 case Bytecodes::_getfield:
2687 case Bytecodes::_putfield:
2688 case Bytecodes::_getstatic:
2689 case Bytecodes::_putstatic:
2690 {
2691 Bytecode_field field(sd->method(), sd->bci());
2692 st->print(" ");
2693 if (field.name() != NULL)
2694 field.name()->print_symbol_on(st);
2695 else
2696 st->print("<UNKNOWN>");
2697 }
2698 default:
2699 break;
2700 }
2701 }
2702 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2703 }
2704
2705 // Print all scopes
2706 for (;sd != NULL; sd = sd->sender()) {
2707 st->move_to(column);
2708 st->print("; -");
2709 if (sd->method() == NULL) {
2710 st->print("method is NULL");
2711 } else {
2712 sd->method()->print_short_name(st);
2713 }
2714 int lineno = sd->method()->line_number_from_bci(sd->bci());
2715 if (lineno != -1) {
2716 st->print("@%d (line %d)", sd->bci(), lineno);
2717 } else {
2718 st->print("@%d", sd->bci());
2719 }
2720 st->cr();
2721 }
2722 }
2723
2724 // Print relocation information
2725 const char* str = reloc_string_for(begin, end);
2726 if (str != NULL) {
2727 if (sd != NULL) st->cr();
2728 st->move_to(column);
2729 st->print("; {%s}", str);
2730 }
2731 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2732 if (cont_offset != 0) {
2733 st->move_to(column);
2734 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2735 }
2736
2737 }
2738
2739 class DirectNativeCallWrapper: public NativeCallWrapper {
2740 private:
2741 NativeCall* _call;
2742
2743 public:
2744 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2745
2746 virtual address destination() const { return _call->destination(); }
2747 virtual address instruction_address() const { return _call->instruction_address(); }
2748 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2749 virtual address return_address() const { return _call->return_address(); }
2750
2751 virtual address get_resolve_call_stub(bool is_optimized) const {
2752 if (is_optimized) {
2753 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2754 }
2755 return SharedRuntime::get_resolve_virtual_call_stub();
2756 }
2757
2758 virtual void set_destination_mt_safe(address dest) {
2759 #if INCLUDE_AOT
2760 if (UseAOT) {
2761 CodeBlob* callee = CodeCache::find_blob(dest);
2762 CompiledMethod* cm = callee->as_compiled_method_or_null();
2763 if (cm != NULL && cm->is_far_code()) {
2764 // Temporary fix, see JDK-8143106
2765 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2766 csc->set_to_far(methodHandle(cm->method()), dest);
2767 return;
2768 }
2769 }
2770 #endif
2771 _call->set_destination_mt_safe(dest);
2772 }
2773
2774 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2775 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2776 #if INCLUDE_AOT
2777 if (info.to_aot()) {
2778 csc->set_to_far(method, info.entry());
2779 } else
2780 #endif
2781 {
2782 csc->set_to_interpreted(method, info.entry());
2783 }
2784 }
2785
2786 virtual void verify() const {
2787 // make sure code pattern is actually a call imm32 instruction
2788 _call->verify();
2789 _call->verify_alignment();
2790 }
2791
2792 virtual void verify_resolve_call(address dest) const {
2793 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2794 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2795 }
2796
2797 virtual bool is_call_to_interpreted(address dest) const {
2798 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2799 return cb->contains(dest);
2800 }
2801
2802 virtual bool is_safe_for_patching() const { return false; }
2803
2804 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2805 return nativeMovConstReg_at(r->cached_value());
2806 }
2807
2808 virtual void *get_data(NativeInstruction* instruction) const {
2809 return (void*)((NativeMovConstReg*) instruction)->data();
2810 }
2811
2812 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2813 ((NativeMovConstReg*) instruction)->set_data(data);
2814 }
2815 };
2816
2817 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2818 return new DirectNativeCallWrapper((NativeCall*) call);
2819 }
2820
2821 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2822 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2823 }
2824
2825 address nmethod::call_instruction_address(address pc) const {
2826 if (NativeCall::is_call_before(pc)) {
2827 NativeCall *ncall = nativeCall_before(pc);
2828 return ncall->instruction_address();
2829 }
2830 return NULL;
2831 }
2832
2833 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2834 return CompiledDirectStaticCall::at(call_site);
2835 }
2836
2837 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2838 return CompiledDirectStaticCall::at(call_site);
2839 }
2840
2841 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2842 return CompiledDirectStaticCall::before(return_addr);
2843 }
2844
2845 #ifndef PRODUCT
2846
2847 void nmethod::print_value_on(outputStream* st) const {
2848 st->print("nmethod");
2849 print_on(st, NULL);
2850 }
2851
2852 void nmethod::print_calls(outputStream* st) {
2853 RelocIterator iter(this);
2854 while (iter.next()) {
2855 switch (iter.type()) {
2856 case relocInfo::virtual_call_type:
2857 case relocInfo::opt_virtual_call_type: {
2858 CompiledICLocker ml_verify(this);
2859 CompiledIC_at(&iter)->print();
2860 break;
2861 }
2862 case relocInfo::static_call_type:
2863 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2864 CompiledDirectStaticCall::at(iter.reloc())->print();
2865 break;
2866 default:
2867 break;
2868 }
2869 }
2870 }
2871
2872 void nmethod::print_handler_table() {
2873 ExceptionHandlerTable(this).print();
2874 }
2875
2876 void nmethod::print_nul_chk_table() {
2877 ImplicitExceptionTable(this).print(code_begin());
2878 }
2879
2880 void nmethod::print_statistics() {
2881 ttyLocker ttyl;
2882 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2883 native_nmethod_stats.print_native_nmethod_stats();
2884 #ifdef COMPILER1
2885 c1_java_nmethod_stats.print_nmethod_stats("C1");
2886 #endif
2887 #ifdef COMPILER2
2888 c2_java_nmethod_stats.print_nmethod_stats("C2");
2889 #endif
2890 #if INCLUDE_JVMCI
2891 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2892 #endif
2893 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2894 DebugInformationRecorder::print_statistics();
2895 #ifndef PRODUCT
2896 pc_nmethod_stats.print_pc_stats();
2897 #endif
2898 Dependencies::print_statistics();
2899 if (xtty != NULL) xtty->tail("statistics");
2900 }
2901
2902 #endif // !PRODUCT
2903
2904 #if INCLUDE_JVMCI
2905 void nmethod::update_speculation(JavaThread* thread) {
2906 jlong speculation = thread->pending_failed_speculation();
2907 if (speculation != 0) {
2908 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
2909 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
2910 thread->set_pending_failed_speculation(0);
2911 }
2912 }
2913
2914 const char* nmethod::jvmci_name() {
2915 if (jvmci_nmethod_data() != NULL) {
2916 return jvmci_nmethod_data()->name();
2917 }
2918 return NULL;
2919 }
2920 #endif