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