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/nmethodBarrier.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "gc/shared/behaviours.hpp"
42 #include "interpreter/bytecode.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "runtime/atomic.hpp"
52 #include "runtime/flags/flagSetting.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/sweeper.hpp"
61 #include "runtime/vmThread.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/behaviours.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/resourceHash.hpp"
67 #include "utilities/xmlstream.hpp"
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciJavaClasses.hpp"
70 #endif
71
72 #ifdef DTRACE_ENABLED
73
74 // Only bother with this argument setup if dtrace is available
75
76 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
77 { \
78 Method* m = (method); \
79 if (m != NULL) { \
80 Symbol* klass_name = m->klass_name(); \
81 Symbol* name = m->name(); \
82 Symbol* signature = m->signature(); \
83 HOTSPOT_COMPILED_METHOD_UNLOAD( \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length()); \
87 } \
88 }
89
90 #else // ndef DTRACE_ENABLED
91
92 #define DTRACE_METHOD_UNLOAD_PROBE(method)
93
94 #endif
95
96 //---------------------------------------------------------------------------------
97 // NMethod statistics
98 // They are printed under various flags, including:
99 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
100 // (In the latter two cases, they like other stats are printed to the log only.)
101
102 #ifndef PRODUCT
103 // These variables are put into one block to reduce relocations
104 // and make it simpler to print from the debugger.
105 struct java_nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117 int oops_size;
118 int metadata_size;
119
120 void note_nmethod(nmethod* nm) {
121 nmethod_count += 1;
122 total_size += nm->size();
123 relocation_size += nm->relocation_size();
124 consts_size += nm->consts_size();
125 insts_size += nm->insts_size();
126 stub_size += nm->stub_size();
127 oops_size += nm->oops_size();
128 metadata_size += nm->metadata_size();
129 scopes_data_size += nm->scopes_data_size();
130 scopes_pcs_size += nm->scopes_pcs_size();
131 dependencies_size += nm->dependencies_size();
132 handler_table_size += nm->handler_table_size();
133 nul_chk_table_size += nm->nul_chk_table_size();
134 }
135 void print_nmethod_stats(const char* name) {
136 if (nmethod_count == 0) return;
137 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
138 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
139 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
140 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
141 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
142 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
143 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
144 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
145 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
146 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
147 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
148 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
149 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
150 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
151 }
152 };
153
154 struct native_nmethod_stats_struct {
155 int native_nmethod_count;
156 int native_total_size;
157 int native_relocation_size;
158 int native_insts_size;
159 int native_oops_size;
160 int native_metadata_size;
161 void note_native_nmethod(nmethod* nm) {
162 native_nmethod_count += 1;
163 native_total_size += nm->size();
164 native_relocation_size += nm->relocation_size();
165 native_insts_size += nm->insts_size();
166 native_oops_size += nm->oops_size();
167 native_metadata_size += nm->metadata_size();
168 }
169 void print_native_nmethod_stats() {
170 if (native_nmethod_count == 0) return;
171 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
172 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
173 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
174 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
175 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
176 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
177 }
178 };
179
180 struct pc_nmethod_stats_struct {
181 int pc_desc_resets; // number of resets (= number of caches)
182 int pc_desc_queries; // queries to nmethod::find_pc_desc
183 int pc_desc_approx; // number of those which have approximate true
184 int pc_desc_repeats; // number of _pc_descs[0] hits
185 int pc_desc_hits; // number of LRU cache hits
186 int pc_desc_tests; // total number of PcDesc examinations
187 int pc_desc_searches; // total number of quasi-binary search steps
188 int pc_desc_adds; // number of LUR cache insertions
189
190 void print_pc_stats() {
191 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
192 pc_desc_queries,
193 (double)(pc_desc_tests + pc_desc_searches)
194 / pc_desc_queries);
195 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
196 pc_desc_resets,
197 pc_desc_queries, pc_desc_approx,
198 pc_desc_repeats, pc_desc_hits,
199 pc_desc_tests, pc_desc_searches, pc_desc_adds);
200 }
201 };
202
203 #ifdef COMPILER1
204 static java_nmethod_stats_struct c1_java_nmethod_stats;
205 #endif
206 #ifdef COMPILER2
207 static java_nmethod_stats_struct c2_java_nmethod_stats;
208 #endif
209 #if INCLUDE_JVMCI
210 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
211 #endif
212 static java_nmethod_stats_struct unknown_java_nmethod_stats;
213
214 static native_nmethod_stats_struct native_nmethod_stats;
215 static pc_nmethod_stats_struct pc_nmethod_stats;
216
217 static void note_java_nmethod(nmethod* nm) {
218 #ifdef COMPILER1
219 if (nm->is_compiled_by_c1()) {
220 c1_java_nmethod_stats.note_nmethod(nm);
221 } else
222 #endif
223 #ifdef COMPILER2
224 if (nm->is_compiled_by_c2()) {
225 c2_java_nmethod_stats.note_nmethod(nm);
226 } else
227 #endif
228 #if INCLUDE_JVMCI
229 if (nm->is_compiled_by_jvmci()) {
230 jvmci_java_nmethod_stats.note_nmethod(nm);
231 } else
232 #endif
233 {
234 unknown_java_nmethod_stats.note_nmethod(nm);
235 }
236 }
237 #endif // !PRODUCT
238
239 //---------------------------------------------------------------------------------
240
241
242 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
243 assert(pc != NULL, "Must be non null");
244 assert(exception.not_null(), "Must be non null");
245 assert(handler != NULL, "Must be non null");
246
247 _count = 0;
248 _exception_type = exception->klass();
249 _next = NULL;
250
251 add_address_and_handler(pc,handler);
252 }
253
254
255 address ExceptionCache::match(Handle exception, address pc) {
256 assert(pc != NULL,"Must be non null");
257 assert(exception.not_null(),"Must be non null");
258 if (exception->klass() == exception_type()) {
259 return (test_address(pc));
260 }
261
262 return NULL;
263 }
264
265
266 bool ExceptionCache::match_exception_with_space(Handle exception) {
267 assert(exception.not_null(),"Must be non null");
268 if (exception->klass() == exception_type() && count() < cache_size) {
269 return true;
270 }
271 return false;
272 }
273
274
275 address ExceptionCache::test_address(address addr) {
276 int limit = count();
277 for (int i = 0; i < limit; i++) {
278 if (pc_at(i) == addr) {
279 return handler_at(i);
280 }
281 }
282 return NULL;
283 }
284
285
286 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
287 if (test_address(addr) == handler) return true;
288
289 int index = count();
290 if (index < cache_size) {
291 set_pc_at(index, addr);
292 set_handler_at(index, handler);
293 increment_count();
294 return true;
295 }
296 return false;
297 }
298
299 //-----------------------------------------------------------------------------
300
301 // Helper used by both find_pc_desc methods.
302 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
303 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
304 if (!approximate)
305 return pc->pc_offset() == pc_offset;
306 else
307 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
308 }
309
310 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
311 if (initial_pc_desc == NULL) {
312 _pc_descs[0] = NULL; // native method; no PcDescs at all
313 return;
314 }
315 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
316 // reset the cache by filling it with benign (non-null) values
317 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
318 for (int i = 0; i < cache_size; i++)
319 _pc_descs[i] = initial_pc_desc;
320 }
321
322 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
324 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
325
326 // Note: one might think that caching the most recently
327 // read value separately would be a win, but one would be
328 // wrong. When many threads are updating it, the cache
329 // line it's in would bounce between caches, negating
330 // any benefit.
331
332 // In order to prevent race conditions do not load cache elements
333 // repeatedly, but use a local copy:
334 PcDesc* res;
335
336 // Step one: Check the most recently added value.
337 res = _pc_descs[0];
338 if (res == NULL) return NULL; // native method; no PcDescs at all
339 if (match_desc(res, pc_offset, approximate)) {
340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
341 return res;
342 }
343
344 // Step two: Check the rest of the LRU cache.
345 for (int i = 1; i < cache_size; ++i) {
346 res = _pc_descs[i];
347 if (res->pc_offset() < 0) break; // optimization: skip empty cache
348 if (match_desc(res, pc_offset, approximate)) {
349 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
350 return res;
351 }
352 }
353
354 // Report failure.
355 return NULL;
356 }
357
358 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
360 // Update the LRU cache by shifting pc_desc forward.
361 for (int i = 0; i < cache_size; i++) {
362 PcDesc* next = _pc_descs[i];
363 _pc_descs[i] = pc_desc;
364 pc_desc = next;
365 }
366 }
367
368 // adjust pcs_size so that it is a multiple of both oopSize and
369 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
370 // of oopSize, then 2*sizeof(PcDesc) is)
371 static int adjust_pcs_size(int pcs_size) {
372 int nsize = align_up(pcs_size, oopSize);
373 if ((nsize % sizeof(PcDesc)) != 0) {
374 nsize = pcs_size + sizeof(PcDesc);
375 }
376 assert((nsize % oopSize) == 0, "correct alignment");
377 return nsize;
378 }
379
380
381 int nmethod::total_size() const {
382 return
383 consts_size() +
384 insts_size() +
385 stub_size() +
386 scopes_data_size() +
387 scopes_pcs_size() +
388 handler_table_size() +
389 nul_chk_table_size();
390 }
391
392 address* nmethod::orig_pc_addr(const frame* fr) {
393 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
394 }
395
396 const char* nmethod::compile_kind() const {
397 if (is_osr_method()) return "osr";
398 if (method() != NULL && is_native_method()) return "c2n";
399 return NULL;
400 }
401
402 // Fill in default values for various flag fields
403 void nmethod::init_defaults() {
404 _state = not_installed;
405 _has_flushed_dependencies = 0;
406 _lock_count = 0;
407 _stack_traversal_mark = 0;
408 _unload_reported = false; // jvmti state
409 _is_far_code = false; // nmethods are located in CodeCache
410
411 #ifdef ASSERT
412 _oops_are_stale = false;
413 #endif
414
415 _oops_do_mark_link = NULL;
416 _jmethod_id = NULL;
417 _osr_link = NULL;
418 _scavenge_root_link = NULL;
419 _scavenge_root_state = 0;
420 #if INCLUDE_RTM_OPT
421 _rtm_state = NoRTM;
422 #endif
423 #if INCLUDE_JVMCI
424 _jvmci_installed_code = NULL;
425 _speculation_log = NULL;
426 _jvmci_installed_code_triggers_unloading = false;
427 #endif
428 }
429
430 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
431 int compile_id,
432 CodeBuffer *code_buffer,
433 int vep_offset,
434 int frame_complete,
435 int frame_size,
436 ByteSize basic_lock_owner_sp_offset,
437 ByteSize basic_lock_sp_offset,
438 OopMapSet* oop_maps) {
439 code_buffer->finalize_oop_references(method);
440 // create nmethod
441 nmethod* nm = NULL;
442 {
443 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
444 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
445 CodeOffsets offsets;
446 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
447 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
448 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
449 compile_id, &offsets,
450 code_buffer, frame_size,
451 basic_lock_owner_sp_offset,
452 basic_lock_sp_offset, oop_maps);
453 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
454 }
455
456 if (nm != NULL) {
457 // verify nmethod
458 debug_only(nm->verify();) // might block
459
460 nm->log_new_nmethod();
461 nm->make_in_use();
462 }
463 return nm;
464 }
465
466 nmethod* nmethod::new_nmethod(const methodHandle& method,
467 int compile_id,
468 int entry_bci,
469 CodeOffsets* offsets,
470 int orig_pc_offset,
471 DebugInformationRecorder* debug_info,
472 Dependencies* dependencies,
473 CodeBuffer* code_buffer, int frame_size,
474 OopMapSet* oop_maps,
475 ExceptionHandlerTable* handler_table,
476 ImplicitExceptionTable* nul_chk_table,
477 AbstractCompiler* compiler,
478 int comp_level
479 #if INCLUDE_JVMCI
480 , jweak installed_code,
481 jweak speculationLog
482 #endif
483 )
484 {
485 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
486 code_buffer->finalize_oop_references(method);
487 // create nmethod
488 nmethod* nm = NULL;
489 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
490 int nmethod_size =
491 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
492 + adjust_pcs_size(debug_info->pcs_size())
493 + align_up((int)dependencies->size_in_bytes(), oopSize)
494 + align_up(handler_table->size_in_bytes() , oopSize)
495 + align_up(nul_chk_table->size_in_bytes() , oopSize)
496 + align_up(debug_info->data_size() , oopSize);
497
498 nm = new (nmethod_size, comp_level)
499 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
500 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
501 oop_maps,
502 handler_table,
503 nul_chk_table,
504 compiler,
505 comp_level
506 #if INCLUDE_JVMCI
507 , installed_code,
508 speculationLog
509 #endif
510 );
511
512 if (nm != NULL) {
513 // To make dependency checking during class loading fast, record
514 // the nmethod dependencies in the classes it is dependent on.
515 // This allows the dependency checking code to simply walk the
516 // class hierarchy above the loaded class, checking only nmethods
517 // which are dependent on those classes. The slow way is to
518 // check every nmethod for dependencies which makes it linear in
519 // the number of methods compiled. For applications with a lot
520 // classes the slow way is too slow.
521 for (Dependencies::DepStream deps(nm); deps.next(); ) {
522 if (deps.type() == Dependencies::call_site_target_value) {
523 // CallSite dependencies are managed on per-CallSite instance basis.
524 oop call_site = deps.argument_oop(0);
525 MethodHandles::add_dependent_nmethod(call_site, nm);
526 } else {
527 Klass* klass = deps.context_type();
528 if (klass == NULL) {
529 continue; // ignore things like evol_method
530 }
531 // record this nmethod as dependent on this klass
532 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
533 }
534 }
535 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
536 }
537 }
538 // Do verification and logging outside CodeCache_lock.
539 if (nm != NULL) {
540 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
541 DEBUG_ONLY(nm->verify();)
542 nm->log_new_nmethod();
543 }
544 return nm;
545 }
546
547 // For native wrappers
548 nmethod::nmethod(
549 Method* method,
550 CompilerType type,
551 int nmethod_size,
552 int compile_id,
553 CodeOffsets* offsets,
554 CodeBuffer* code_buffer,
555 int frame_size,
556 ByteSize basic_lock_owner_sp_offset,
557 ByteSize basic_lock_sp_offset,
558 OopMapSet* oop_maps )
559 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
560 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
561 _native_basic_lock_sp_offset(basic_lock_sp_offset)
562 {
563 {
564 int scopes_data_offset = 0;
565 int deoptimize_offset = 0;
566 int deoptimize_mh_offset = 0;
567
568 debug_only(NoSafepointVerifier nsv;)
569 assert_locked_or_safepoint(CodeCache_lock);
570
571 init_defaults();
572 _entry_bci = InvocationEntryBci;
573 // We have no exception handler or deopt handler make the
574 // values something that will never match a pc like the nmethod vtable entry
575 _exception_offset = 0;
576 _orig_pc_offset = 0;
577
578 _consts_offset = data_offset();
579 _stub_offset = data_offset();
580 _oops_offset = data_offset();
581 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
582 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
583 _scopes_pcs_offset = scopes_data_offset;
584 _dependencies_offset = _scopes_pcs_offset;
585 _handler_table_offset = _dependencies_offset;
586 _nul_chk_table_offset = _handler_table_offset;
587 _nmethod_end_offset = _nul_chk_table_offset;
588 _compile_id = compile_id;
589 _comp_level = CompLevel_none;
590 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
591 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
592 _osr_entry_point = NULL;
593 _exception_cache = NULL;
594 _pc_desc_container.reset_to(NULL);
595 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
596
597 _scopes_data_begin = (address) this + scopes_data_offset;
598 _deopt_handler_begin = (address) this + deoptimize_offset;
599 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
600
601 code_buffer->copy_code_and_locs_to(this);
602 code_buffer->copy_values_to(this);
603
604 clear_unloading_state();
605 if (ScavengeRootsInCode) {
606 Universe::heap()->register_nmethod(this);
607 }
608 debug_only(Universe::heap()->verify_nmethod(this));
609 CodeCache::commit(this);
610 }
611
612 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
613 ttyLocker ttyl; // keep the following output all in one block
614 // This output goes directly to the tty, not the compiler log.
615 // To enable tools to match it up with the compilation activity,
616 // be sure to tag this tty output with the compile ID.
617 if (xtty != NULL) {
618 xtty->begin_head("print_native_nmethod");
619 xtty->method(_method);
620 xtty->stamp();
621 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
622 }
623 // print the header part first
624 print();
625 // then print the requested information
626 if (PrintNativeNMethods) {
627 print_code();
628 if (oop_maps != NULL) {
629 oop_maps->print();
630 }
631 }
632 if (PrintRelocations) {
633 print_relocations();
634 }
635 if (xtty != NULL) {
636 xtty->tail("print_native_nmethod");
637 }
638 }
639 }
640
641 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
642 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
643 }
644
645 nmethod::nmethod(
646 Method* method,
647 CompilerType type,
648 int nmethod_size,
649 int compile_id,
650 int entry_bci,
651 CodeOffsets* offsets,
652 int orig_pc_offset,
653 DebugInformationRecorder* debug_info,
654 Dependencies* dependencies,
655 CodeBuffer *code_buffer,
656 int frame_size,
657 OopMapSet* oop_maps,
658 ExceptionHandlerTable* handler_table,
659 ImplicitExceptionTable* nul_chk_table,
660 AbstractCompiler* compiler,
661 int comp_level
662 #if INCLUDE_JVMCI
663 , jweak installed_code,
664 jweak speculation_log
665 #endif
666 )
667 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
668 _native_receiver_sp_offset(in_ByteSize(-1)),
669 _native_basic_lock_sp_offset(in_ByteSize(-1))
670 {
671 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
672 {
673 debug_only(NoSafepointVerifier nsv;)
674 assert_locked_or_safepoint(CodeCache_lock);
675
676 _deopt_handler_begin = (address) this;
677 _deopt_mh_handler_begin = (address) this;
678
679 init_defaults();
680 _entry_bci = entry_bci;
681 _compile_id = compile_id;
682 _comp_level = comp_level;
683 _orig_pc_offset = orig_pc_offset;
684 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
685
686 // Section offsets
687 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
688 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
689 set_ctable_begin(header_begin() + _consts_offset);
690
691 #if INCLUDE_JVMCI
692 _jvmci_installed_code = installed_code;
693 _speculation_log = speculation_log;
694 oop obj = JNIHandles::resolve(installed_code);
695 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
696 _jvmci_installed_code_triggers_unloading = false;
697 } else {
698 _jvmci_installed_code_triggers_unloading = true;
699 }
700
701 if (compiler->is_jvmci()) {
702 // JVMCI might not produce any stub sections
703 if (offsets->value(CodeOffsets::Exceptions) != -1) {
704 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
705 } else {
706 _exception_offset = -1;
707 }
708 if (offsets->value(CodeOffsets::Deopt) != -1) {
709 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
710 } else {
711 _deopt_handler_begin = NULL;
712 }
713 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
714 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
715 } else {
716 _deopt_mh_handler_begin = NULL;
717 }
718 } else {
719 #endif
720 // Exception handler and deopt handler are in the stub section
721 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
722 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
723
724 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
725 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
726 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
727 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
728 } else {
729 _deopt_mh_handler_begin = NULL;
730 #if INCLUDE_JVMCI
731 }
732 #endif
733 }
734 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
735 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
736 } else {
737 _unwind_handler_offset = -1;
738 }
739
740 _oops_offset = data_offset();
741 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
742 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
743
744 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
745 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
746 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
747 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
748 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
749 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
750 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
751 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
752 _osr_entry_barrier = code_begin() + offsets->value(CodeOffsets::OSR_EntryBarrier);
753 _exception_cache = NULL;
754
755 _scopes_data_begin = (address) this + scopes_data_offset;
756
757 _pc_desc_container.reset_to(scopes_pcs_begin());
758
759 code_buffer->copy_code_and_locs_to(this);
760 // Copy contents of ScopeDescRecorder to nmethod
761 code_buffer->copy_values_to(this);
762 debug_info->copy_to(this);
763 dependencies->copy_to(this);
764 clear_unloading_state();
765 if (ScavengeRootsInCode) {
766 Universe::heap()->register_nmethod(this);
767 }
768 debug_only(Universe::heap()->verify_nmethod(this));
769
770 CodeCache::commit(this);
771
772 // Copy contents of ExceptionHandlerTable to nmethod
773 handler_table->copy_to(this);
774 nul_chk_table->copy_to(this);
775
776 // we use the information of entry points to find out if a method is
777 // static or non static
778 assert(compiler->is_c2() || compiler->is_jvmci() ||
779 _method->is_static() == (entry_point() == _verified_entry_point),
780 " entry points must be same for static methods and vice versa");
781 }
782 }
783
784 // Print a short set of xml attributes to identify this nmethod. The
785 // output should be embedded in some other element.
786 void nmethod::log_identity(xmlStream* log) const {
787 log->print(" compile_id='%d'", compile_id());
788 const char* nm_kind = compile_kind();
789 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
790 log->print(" compiler='%s'", compiler_name());
791 if (TieredCompilation) {
792 log->print(" level='%d'", comp_level());
793 }
794 }
795
796
797 #define LOG_OFFSET(log, name) \
798 if (p2i(name##_end()) - p2i(name##_begin())) \
799 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
800 p2i(name##_begin()) - p2i(this))
801
802
803 bool nmethod::is_armed() {
804 if (method()->is_method_handle_intrinsic()) {
805 return false;
806 }
807
808 if (!is_native_method() && !is_compiled_by_c2() && !is_compiled_by_c1()) {
809 return false;
810 }
811
812 return nmethodBarrier::is_armed(this);
813 }
814
815 void nmethod::disarm_barrier() {
816 if (method()->is_method_handle_intrinsic()) {
817 return;
818 }
819
820 if (!is_native_method() && !is_compiled_by_c2() && !is_compiled_by_c1()) {
821 return;
822 }
823
824 nmethodBarrier::disarm_barrier(this);
825 }
826
827 void nmethod::log_new_nmethod() const {
828 if (LogCompilation && xtty != NULL) {
829 ttyLocker ttyl;
830 HandleMark hm;
831 xtty->begin_elem("nmethod");
832 log_identity(xtty);
833 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
834 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
835
836 LOG_OFFSET(xtty, relocation);
837 LOG_OFFSET(xtty, consts);
838 LOG_OFFSET(xtty, insts);
839 LOG_OFFSET(xtty, stub);
840 LOG_OFFSET(xtty, scopes_data);
841 LOG_OFFSET(xtty, scopes_pcs);
842 LOG_OFFSET(xtty, dependencies);
843 LOG_OFFSET(xtty, handler_table);
844 LOG_OFFSET(xtty, nul_chk_table);
845 LOG_OFFSET(xtty, oops);
846 LOG_OFFSET(xtty, metadata);
847
848 xtty->method(method());
849 xtty->stamp();
850 xtty->end_elem();
851 }
852 }
853
854 #undef LOG_OFFSET
855
856
857 // Print out more verbose output usually for a newly created nmethod.
858 void nmethod::print_on(outputStream* st, const char* msg) const {
859 if (st != NULL) {
860 ttyLocker ttyl;
861 if (WizardMode) {
862 CompileTask::print(st, this, msg, /*short_form:*/ true);
863 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
864 } else {
865 CompileTask::print(st, this, msg, /*short_form:*/ false);
866 }
867 }
868 }
869
870 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
871 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
872 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
873 print_nmethod(printnmethods);
874 }
875 }
876
877 void nmethod::print_nmethod(bool printmethod) {
878 ttyLocker ttyl; // keep the following output all in one block
879 if (xtty != NULL) {
880 xtty->begin_head("print_nmethod");
881 xtty->stamp();
882 xtty->end_head();
883 }
884 // print the header part first
885 print();
886 // then print the requested information
887 if (printmethod) {
888 print_code();
889 print_pcs();
890 if (oop_maps()) {
891 oop_maps()->print();
892 }
893 }
894 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
895 print_scopes();
896 }
897 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
898 print_relocations();
899 }
900 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
901 print_dependencies();
902 }
903 if (printmethod || PrintExceptionHandlers) {
904 print_handler_table();
905 print_nul_chk_table();
906 }
907 if (printmethod) {
908 print_recorded_oops();
909 print_recorded_metadata();
910 }
911 if (xtty != NULL) {
912 xtty->tail("print_nmethod");
913 }
914 }
915
916
917 // Promote one word from an assembly-time handle to a live embedded oop.
918 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
919 if (handle == NULL ||
920 // As a special case, IC oops are initialized to 1 or -1.
921 handle == (jobject) Universe::non_oop_word()) {
922 (*dest) = (oop) handle;
923 } else {
924 (*dest) = JNIHandles::resolve_non_null(handle);
925 }
926 }
927
928
929 // Have to have the same name because it's called by a template
930 void nmethod::copy_values(GrowableArray<jobject>* array) {
931 int length = array->length();
932 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
933 oop* dest = oops_begin();
934 for (int index = 0 ; index < length; index++) {
935 initialize_immediate_oop(&dest[index], array->at(index));
936 }
937
938 // Now we can fix up all the oops in the code. We need to do this
939 // in the code because the assembler uses jobjects as placeholders.
940 // The code and relocations have already been initialized by the
941 // CodeBlob constructor, so it is valid even at this early point to
942 // iterate over relocations and patch the code.
943 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
944 }
945
946 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
947 int length = array->length();
948 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
949 Metadata** dest = metadata_begin();
950 for (int index = 0 ; index < length; index++) {
951 dest[index] = array->at(index);
952 }
953 }
954
955 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
956 // re-patch all oop-bearing instructions, just in case some oops moved
957 RelocIterator iter(this, begin, end);
958 while (iter.next()) {
959 if (iter.type() == relocInfo::oop_type) {
960 oop_Relocation* reloc = iter.oop_reloc();
961 if (initialize_immediates && reloc->oop_is_immediate()) {
962 oop* dest = reloc->oop_addr();
963 initialize_immediate_oop(dest, (jobject) *dest);
964 }
965 // Refresh the oop-related bits of this instruction.
966 reloc->fix_oop_relocation();
967 } else if (iter.type() == relocInfo::metadata_type) {
968 metadata_Relocation* reloc = iter.metadata_reloc();
969 reloc->fix_metadata_relocation();
970 }
971 }
972 }
973
974
975 void nmethod::verify_clean_inline_caches() {
976 assert_locked_or_safepoint(CompiledIC_lock);
977
978 ResourceMark rm;
979 RelocIterator iter(this, oops_reloc_begin());
980 while(iter.next()) {
981 switch(iter.type()) {
982 case relocInfo::virtual_call_type:
983 case relocInfo::opt_virtual_call_type: {
984 CompiledIC *ic = CompiledIC_at(&iter);
985 // Ok, to lookup references to zombies here
986 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
987 assert(cb != NULL, "destination not in CodeBlob?");
988 nmethod* nm = cb->as_nmethod_or_null();
989 if( nm != NULL ) {
990 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
991 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
992 assert(ic->is_clean(), "IC should be clean");
993 }
994 }
995 break;
996 }
997 case relocInfo::static_call_type: {
998 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
999 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1000 assert(cb != NULL, "destination not in CodeBlob?");
1001 nmethod* nm = cb->as_nmethod_or_null();
1002 if( nm != NULL ) {
1003 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1004 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1005 assert(csc->is_clean(), "IC should be clean");
1006 }
1007 }
1008 break;
1009 }
1010 default:
1011 break;
1012 }
1013 }
1014 }
1015
1016 // This is a private interface with the sweeper.
1017 void nmethod::mark_as_seen_on_stack() {
1018 assert(is_alive(), "Must be an alive method");
1019 // Set the traversal mark to ensure that the sweeper does 2
1020 // cleaning passes before moving to zombie.
1021 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1022 }
1023
1024 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1025 // there are no activations on the stack, not in use by the VM,
1026 // and not in use by the ServiceThread)
1027 bool nmethod::can_convert_to_zombie() {
1028 assert(is_not_entrant(), "must be a non-entrant method");
1029
1030 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1031 // count can be greater than the stack traversal count before it hits the
1032 // nmethod for the second time.
1033 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1034 !is_locked_by_vm() && !is_unloading();
1035 }
1036
1037 void nmethod::inc_decompile_count() {
1038 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1039 // Could be gated by ProfileTraps, but do not bother...
1040 Method* m = method();
1041 if (m == NULL) return;
1042 MethodData* mdo = m->method_data();
1043 if (mdo == NULL) return;
1044 // There is a benign race here. See comments in methodData.hpp.
1045 mdo->inc_decompile_count();
1046 }
1047
1048 void nmethod::make_unloaded() {
1049 post_compiled_method_unload();
1050
1051 // This nmethod is being unloaded, make sure that dependencies
1052 // recorded in instanceKlasses get flushed.
1053 // Since this work is being done during a GC, defer deleting dependencies from the
1054 // InstanceKlass.
1055 assert(UseZGC || Universe::heap()->is_gc_active(), "should only be called during gc");
1056 flush_dependencies(/*delete_immediately*/false);
1057
1058 // Break cycle between nmethod & method
1059 LogTarget(Trace, class, unload, nmethod) lt;
1060 if (lt.is_enabled()) {
1061 LogStream ls(lt);
1062 ls.print("making nmethod " INTPTR_FORMAT
1063 " unloadable, Method*(" INTPTR_FORMAT
1064 ") ",
1065 p2i(this), p2i(_method));
1066 ls.cr();
1067 }
1068 // Unlink the osr method, so we do not look this up again
1069 if (is_osr_method()) {
1070 // Invalidate the osr nmethod only once
1071 if (is_in_use()) {
1072 invalidate_osr_method();
1073 }
1074 #ifdef ASSERT
1075 if (method() != NULL) {
1076 // Make sure osr nmethod is invalidated, i.e. not on the list
1077 bool found = method()->method_holder()->remove_osr_nmethod(this);
1078 assert(!found, "osr nmethod should have been invalidated");
1079 }
1080 #endif
1081 }
1082
1083 // If _method is already NULL the Method* is about to be unloaded,
1084 // so we don't have to break the cycle. Note that it is possible to
1085 // have the Method* live here, in case we unload the nmethod because
1086 // it is pointing to some oop (other than the Method*) being unloaded.
1087 if (_method != NULL) {
1088 // OSR methods point to the Method*, but the Method* does not
1089 // point back!
1090 if (_method->code() == this) {
1091 _method->clear_code(); // Break a cycle
1092 }
1093 _method = NULL; // Clear the method of this dead nmethod
1094 }
1095
1096 // Make the class unloaded - i.e., change state and notify sweeper
1097 assert(UseZGC || SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1098
1099 // Unregister must be done before the state change
1100 Universe::heap()->unregister_nmethod(this);
1101
1102 _state = unloaded;
1103
1104 // Log the unloading.
1105 log_state_change();
1106
1107 #if INCLUDE_JVMCI
1108 // The method can only be unloaded after the pointer to the installed code
1109 // Java wrapper is no longer alive. Here we need to clear out this weak
1110 // reference to the dead object.
1111 maybe_invalidate_installed_code();
1112 #endif
1113
1114 // The Method* is gone at this point
1115 assert(_method == NULL, "Tautology");
1116
1117 set_osr_link(NULL);
1118 NMethodSweeper::report_state_change(this);
1119 }
1120
1121 void nmethod::invalidate_osr_method() {
1122 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1123 // Remove from list of active nmethods
1124 if (method() != NULL) {
1125 method()->method_holder()->remove_osr_nmethod(this);
1126 }
1127 }
1128
1129 void nmethod::log_state_change() const {
1130 if (LogCompilation) {
1131 if (xtty != NULL) {
1132 ttyLocker ttyl; // keep the following output all in one block
1133 if (_state == unloaded) {
1134 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1135 os::current_thread_id());
1136 } else {
1137 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1138 os::current_thread_id(),
1139 (_state == zombie ? " zombie='1'" : ""));
1140 }
1141 log_identity(xtty);
1142 xtty->stamp();
1143 xtty->end_elem();
1144 }
1145 }
1146
1147 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1148 CompileTask::print_ul(this, state_msg);
1149 if (PrintCompilation && _state != unloaded) {
1150 print_on(tty, state_msg);
1151 }
1152 }
1153
1154 /**
1155 * Common functionality for both make_not_entrant and make_zombie
1156 */
1157 bool nmethod::make_not_entrant_or_zombie(int state) {
1158 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1159 assert(!is_zombie(), "should not already be a zombie");
1160
1161 if (_state == state) {
1162 // Avoid taking the lock if already in required state.
1163 // This is safe from races because the state is an end-state,
1164 // which the nmethod cannot back out of once entered.
1165 // No need for fencing either.
1166 return false;
1167 }
1168
1169 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1170 nmethodLocker nml(this);
1171 methodHandle the_method(method());
1172 NoSafepointVerifier nsv;
1173
1174 // during patching, depending on the nmethod state we must notify the GC that
1175 // code has been unloaded, unregistering it. We cannot do this right while
1176 // holding the Patching_lock because we need to use the CodeCache_lock. This
1177 // would be prone to deadlocks.
1178 // This flag is used to remember whether we need to later lock and unregister.
1179 bool nmethod_needs_unregister = false;
1180
1181 {
1182 // invalidate osr nmethod before acquiring the patching lock since
1183 // they both acquire leaf locks and we don't want a deadlock.
1184 // This logic is equivalent to the logic below for patching the
1185 // verified entry point of regular methods. We check that the
1186 // nmethod is in use to ensure that it is invalidated only once.
1187 if (is_osr_method() && is_in_use()) {
1188 // this effectively makes the osr nmethod not entrant
1189 invalidate_osr_method();
1190 }
1191
1192 // Enter critical section. Does not block for safepoint.
1193 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1194
1195 if (_state == state) {
1196 // another thread already performed this transition so nothing
1197 // to do, but return false to indicate this.
1198 return false;
1199 }
1200
1201 // The caller can be calling the method statically or through an inline
1202 // cache call.
1203 if (!is_osr_method() && !is_not_entrant()) {
1204 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1205 SharedRuntime::get_handle_wrong_method_stub());
1206 }
1207
1208 if (is_in_use() && update_recompile_counts()) {
1209 // It's a true state change, so mark the method as decompiled.
1210 // Do it only for transition from alive.
1211 inc_decompile_count();
1212 }
1213
1214 // If the state is becoming a zombie, signal to unregister the nmethod with
1215 // the heap.
1216 // This nmethod may have already been unloaded during a full GC.
1217 if (state == zombie) {
1218 nmethod_needs_unregister = true;
1219 }
1220
1221 // Must happen before state change. Otherwise we have a race condition in
1222 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1223 // transition its state from 'not_entrant' to 'zombie' without having to wait
1224 // for stack scanning.
1225 if (state == not_entrant) {
1226 mark_as_seen_on_stack();
1227 OrderAccess::storestore(); // _stack_traversal_mark and _state
1228 }
1229
1230 // Change state
1231 _state = state;
1232
1233 // Log the transition once
1234 log_state_change();
1235
1236 // Invalidate while holding the patching lock
1237 JVMCI_ONLY(maybe_invalidate_installed_code());
1238
1239 // Remove nmethod from method.
1240 // We need to check if both the _code and _from_compiled_code_entry_point
1241 // refer to this nmethod because there is a race in setting these two fields
1242 // in Method* as seen in bugid 4947125.
1243 // If the vep() points to the zombie nmethod, the memory for the nmethod
1244 // could be flushed and the compiler and vtable stubs could still call
1245 // through it.
1246 if (method() != NULL && (method()->code() == this ||
1247 method()->from_compiled_entry() == verified_entry_point())) {
1248 HandleMark hm;
1249 method()->clear_code(false /* already owns Patching_lock */);
1250 }
1251 } // leave critical region under Patching_lock
1252
1253 #ifdef ASSERT
1254 if (is_osr_method() && method() != NULL) {
1255 // Make sure osr nmethod is invalidated, i.e. not on the list
1256 bool found = method()->method_holder()->remove_osr_nmethod(this);
1257 assert(!found, "osr nmethod should have been invalidated");
1258 }
1259 #endif
1260
1261 // When the nmethod becomes zombie it is no longer alive so the
1262 // dependencies must be flushed. nmethods in the not_entrant
1263 // state will be flushed later when the transition to zombie
1264 // happens or they get unloaded.
1265 if (state == zombie) {
1266 {
1267 // Flushing dependencies must be done before any possible
1268 // safepoint can sneak in, otherwise the oops used by the
1269 // dependency logic could have become stale.
1270 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1271 if (nmethod_needs_unregister) {
1272 Universe::heap()->unregister_nmethod(this);
1273 }
1274 flush_dependencies(/*delete_immediately*/true);
1275 }
1276
1277 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1278 // event and it hasn't already been reported for this nmethod then
1279 // report it now. The event may have been reported earlier if the GC
1280 // marked it for unloading). JvmtiDeferredEventQueue support means
1281 // we no longer go to a safepoint here.
1282 post_compiled_method_unload();
1283
1284 #ifdef ASSERT
1285 // It's no longer safe to access the oops section since zombie
1286 // nmethods aren't scanned for GC.
1287 _oops_are_stale = true;
1288 #endif
1289 // the Method may be reclaimed by class unloading now that the
1290 // nmethod is in zombie state
1291 set_method(NULL);
1292 } else {
1293 assert(state == not_entrant, "other cases may need to be handled differently");
1294 }
1295
1296 if (TraceCreateZombies) {
1297 ResourceMark m;
1298 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");
1299 }
1300
1301 NMethodSweeper::report_state_change(this);
1302 return true;
1303 }
1304
1305 void nmethod::flush() {
1306 // Note that there are no valid oops in the nmethod anymore.
1307 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1308 "osr nmethod must be unloaded or zombie before flushing");
1309 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1310 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1311 assert_locked_or_safepoint(CodeCache_lock);
1312
1313 // completely deallocate this method
1314 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1315 if (PrintMethodFlushing) {
1316 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1317 "/Free CodeCache:" SIZE_FORMAT "Kb",
1318 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1319 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1320 }
1321
1322 // We need to deallocate any ExceptionCache data.
1323 // Note that we do not need to grab the nmethod lock for this, it
1324 // better be thread safe if we're disposing of it!
1325 ExceptionCache* ec = exception_cache();
1326 set_exception_cache(NULL);
1327 while(ec != NULL) {
1328 ExceptionCache* next = ec->next();
1329 delete ec;
1330 ec = next;
1331 }
1332
1333 if (on_scavenge_root_list()) {
1334 CodeCache::drop_scavenge_root_nmethod(this);
1335 }
1336
1337 #if INCLUDE_JVMCI
1338 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1339 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1340 #endif
1341
1342 CodeBlob::flush();
1343 CodeCache::free(this);
1344 }
1345
1346 //
1347 // Notify all classes this nmethod is dependent on that it is no
1348 // longer dependent. This should only be called in two situations.
1349 // First, when a nmethod transitions to a zombie all dependents need
1350 // to be clear. Since zombification happens at a safepoint there's no
1351 // synchronization issues. The second place is a little more tricky.
1352 // During phase 1 of mark sweep class unloading may happen and as a
1353 // result some nmethods may get unloaded. In this case the flushing
1354 // of dependencies must happen during phase 1 since after GC any
1355 // dependencies in the unloaded nmethod won't be updated, so
1356 // traversing the dependency information in unsafe. In that case this
1357 // function is called with a boolean argument and this function only
1358 // notifies instanceKlasses that are reachable
1359
1360 void nmethod::flush_dependencies(bool delete_immediately) {
1361 MutexLockerEx m(SafepointSynchronize::is_at_safepoint() ||
1362 !CodeCache_lock->owned_by_self() ? CodeCache_lock : NULL,
1363 Mutex::_no_safepoint_check_flag);
1364 assert_locked_or_safepoint(CodeCache_lock);
1365 assert(UseZGC || Universe::heap()->is_gc_active() != delete_immediately,
1366 "delete_immediately is false if and only if we are called during GC");
1367 if (!has_flushed_dependencies()) {
1368 set_has_flushed_dependencies();
1369 for (Dependencies::DepStream deps(this); deps.next(); ) {
1370 if (deps.type() == Dependencies::call_site_target_value) {
1371 // CallSite dependencies are managed on per-CallSite instance basis.
1372 oop call_site = deps.argument_oop(0);
1373 MethodHandles::remove_dependent_nmethod(call_site, this);
1374 } else {
1375 Klass* klass = deps.context_type();
1376 if (klass == NULL) {
1377 continue; // ignore things like evol_method
1378 }
1379 // During GC delete_immediately is false, and liveness
1380 // of dependee determines class that needs to be updated.
1381 if (delete_immediately || klass->is_loader_alive()) {
1382 // The GC defers deletion of this entry, since there might be multiple threads
1383 // iterating over the _dependencies graph. Other call paths are single-threaded
1384 // and may delete it immediately.
1385 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1386 }
1387 }
1388 }
1389 }
1390 }
1391
1392 // ------------------------------------------------------------------
1393 // post_compiled_method_load_event
1394 // new method for install_code() path
1395 // Transfer information from compilation to jvmti
1396 void nmethod::post_compiled_method_load_event() {
1397
1398 Method* moop = method();
1399 HOTSPOT_COMPILED_METHOD_LOAD(
1400 (char *) moop->klass_name()->bytes(),
1401 moop->klass_name()->utf8_length(),
1402 (char *) moop->name()->bytes(),
1403 moop->name()->utf8_length(),
1404 (char *) moop->signature()->bytes(),
1405 moop->signature()->utf8_length(),
1406 insts_begin(), insts_size());
1407
1408 if (JvmtiExport::should_post_compiled_method_load() ||
1409 JvmtiExport::should_post_compiled_method_unload()) {
1410 get_and_cache_jmethod_id();
1411 }
1412
1413 if (JvmtiExport::should_post_compiled_method_load()) {
1414 // Let the Service thread (which is a real Java thread) post the event
1415 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1416 JvmtiDeferredEventQueue::enqueue(
1417 JvmtiDeferredEvent::compiled_method_load_event(this));
1418 }
1419 }
1420
1421 jmethodID nmethod::get_and_cache_jmethod_id() {
1422 if (_jmethod_id == NULL) {
1423 // Cache the jmethod_id since it can no longer be looked up once the
1424 // method itself has been marked for unloading.
1425 _jmethod_id = method()->jmethod_id();
1426 }
1427 return _jmethod_id;
1428 }
1429
1430 void nmethod::post_compiled_method_unload() {
1431 if (unload_reported()) {
1432 // During unloading we transition to unloaded and then to zombie
1433 // and the unloading is reported during the first transition.
1434 return;
1435 }
1436
1437 assert(_method != NULL && !is_unloaded(), "just checking");
1438 DTRACE_METHOD_UNLOAD_PROBE(method());
1439
1440 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1441 // post the event. Sometime later this nmethod will be made a zombie
1442 // by the sweeper but the Method* will not be valid at that point.
1443 // If the _jmethod_id is null then no load event was ever requested
1444 // so don't bother posting the unload. The main reason for this is
1445 // that the jmethodID is a weak reference to the Method* so if
1446 // it's being unloaded there's no way to look it up since the weak
1447 // ref will have been cleared.
1448 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1449 assert(!unload_reported(), "already unloaded");
1450 JvmtiDeferredEvent event =
1451 JvmtiDeferredEvent::compiled_method_unload_event(this,
1452 _jmethod_id, insts_begin());
1453 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1454 JvmtiDeferredEventQueue::enqueue(event);
1455 }
1456
1457 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1458 // any time. As the nmethod is being unloaded now we mark it has
1459 // having the unload event reported - this will ensure that we don't
1460 // attempt to report the event in the unlikely scenario where the
1461 // event is enabled at the time the nmethod is made a zombie.
1462 set_unload_reported();
1463 }
1464
1465 // Iterate over metadata calling this function. Used by RedefineClasses
1466 void nmethod::metadata_do(void f(Metadata*)) {
1467 {
1468 // Visit all immediate references that are embedded in the instruction stream.
1469 RelocIterator iter(this, oops_reloc_begin());
1470 while (iter.next()) {
1471 if (iter.type() == relocInfo::metadata_type ) {
1472 metadata_Relocation* r = iter.metadata_reloc();
1473 // In this metadata, we must only follow those metadatas directly embedded in
1474 // the code. Other metadatas (oop_index>0) are seen as part of
1475 // the metadata section below.
1476 assert(1 == (r->metadata_is_immediate()) +
1477 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1478 "metadata must be found in exactly one place");
1479 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1480 Metadata* md = r->metadata_value();
1481 if (md != _method) f(md);
1482 }
1483 } else if (iter.type() == relocInfo::virtual_call_type) {
1484 // Check compiledIC holders associated with this nmethod
1485 ResourceMark rm;
1486 CompiledIC *ic = CompiledIC_at(&iter);
1487 if (ic->is_icholder_call()) {
1488 CompiledICHolder* cichk = ic->cached_icholder();
1489 f(cichk->holder_metadata());
1490 f(cichk->holder_klass());
1491 } else {
1492 Metadata* ic_oop = ic->cached_metadata();
1493 if (ic_oop != NULL) {
1494 f(ic_oop);
1495 }
1496 }
1497 }
1498 }
1499 }
1500
1501 // Visit the metadata section
1502 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1503 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1504 Metadata* md = *p;
1505 f(md);
1506 }
1507
1508 // Visit metadata not embedded in the other places.
1509 if (_method != NULL) f(_method);
1510 }
1511
1512
1513 // This is called at the end of the strong tracing/marking phase of a
1514 // GC to unload an nmethod if it contains otherwise unreachable
1515 // oops.
1516
1517 void nmethod::do_unloading(bool unloading_occurred) {
1518 // Make sure the oop's ready to receive visitors
1519 assert(!is_zombie() && !is_unloaded(),
1520 "should not call follow on zombie or unloaded nmethod");
1521
1522 if (is_unloading()) {
1523 make_unloaded();
1524 } else {
1525 unload_nmethod_caches(unloading_occurred);
1526 }
1527 }
1528
1529 bool nmethod::is_unloading() {
1530 NMethodIsUnloadingUnion state;
1531 state._value = _is_unloading_state;
1532 if (state._inflated._is_unloading == 1) {
1533 return true;
1534 }
1535 if (state._inflated._unloading_cycle == CodeCache::unloading_cycle()) {
1536 return state._inflated._is_unloading == 1;
1537 }
1538
1539 state._inflated._unloading_cycle = CodeCache::unloading_cycle();
1540 bool is_unloading = false;
1541
1542 PhantomIsAliveBehaviour& is_alive = Behaviours::get_behaviour<PhantomIsAliveBehaviour>();
1543
1544 // Compiled code
1545
1546 // Prevent extra code cache walk for platforms that don't have immediate oops.
1547 if (relocInfo::mustIterateImmediateOopsInCode()) {
1548 RelocIterator iter(this, oops_reloc_begin());
1549 while (!is_unloading && iter.next()) {
1550 if (iter.type() == relocInfo::oop_type) {
1551 oop_Relocation* r = iter.oop_reloc();
1552 // Traverse those oops directly embedded in the code.
1553 // Other oops (oop_index>0) are seen as part of scopes_oops.
1554 assert(1 == (r->oop_is_immediate()) +
1555 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1556 "oop must be found in exactly one place");
1557 if (r->oop_is_immediate()) {
1558 // Unload this nmethod if the oop is dead.
1559 if (!is_alive.is_alive_or_null(r->oop_value())) {
1560 is_unloading = true;
1561 }
1562 }
1563 }
1564 }
1565 }
1566
1567 // Scopes
1568 for (oop* p = oops_begin(); !is_unloading && p < oops_end(); p++) {
1569 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1570 if (!is_alive.is_alive_or_null(*p)) {
1571 is_unloading = true;
1572 }
1573 }
1574
1575 // JVMCI
1576 #if INCLUDE_JVMCI
1577 if (!is_unloading && _jvmci_installed_code != NULL) {
1578 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1579 if (_jvmci_installed_code_triggers_unloading) {
1580 // jweak reference processing has already cleared the referent
1581 is_unloading = true;
1582 } else {
1583 clear_jvmci_installed_code();
1584 }
1585 }
1586 }
1587 #endif
1588
1589 state._inflated._is_unloading = is_unloading ? 1 : 0;
1590 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state._value);
1591
1592 return is_unloading;
1593 }
1594
1595 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1596 // make sure the oops ready to receive visitors
1597 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1598 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1599
1600 // Prevent extra code cache walk for platforms that don't have immediate oops.
1601 if (relocInfo::mustIterateImmediateOopsInCode()) {
1602 RelocIterator iter(this, oops_reloc_begin());
1603
1604 while (iter.next()) {
1605 if (iter.type() == relocInfo::oop_type ) {
1606 oop_Relocation* r = iter.oop_reloc();
1607 // In this loop, we must only follow those oops directly embedded in
1608 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1609 assert(1 == (r->oop_is_immediate()) +
1610 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1611 "oop must be found in exactly one place");
1612 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1613 f->do_oop(r->oop_addr());
1614 }
1615 }
1616 }
1617 }
1618
1619 // Scopes
1620 // This includes oop constants not inlined in the code stream.
1621 for (oop* p = oops_begin(); p < oops_end(); p++) {
1622 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1623 f->do_oop(p);
1624 }
1625 }
1626
1627 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1628
1629 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1630
1631 // An nmethod is "marked" if its _mark_link is set non-null.
1632 // Even if it is the end of the linked list, it will have a non-null link value,
1633 // as long as it is on the list.
1634 // This code must be MP safe, because it is used from parallel GC passes.
1635 bool nmethod::test_set_oops_do_mark() {
1636 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1637 if (_oops_do_mark_link == NULL) {
1638 // Claim this nmethod for this thread to mark.
1639 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1640 // Atomically append this nmethod (now claimed) to the head of the list:
1641 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1642 for (;;) {
1643 nmethod* required_mark_nmethods = observed_mark_nmethods;
1644 _oops_do_mark_link = required_mark_nmethods;
1645 observed_mark_nmethods =
1646 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1647 if (observed_mark_nmethods == required_mark_nmethods)
1648 break;
1649 }
1650 // Mark was clear when we first saw this guy.
1651 LogTarget(Trace, gc, nmethod) lt;
1652 if (lt.is_enabled()) {
1653 LogStream ls(lt);
1654 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1655 }
1656 return false;
1657 }
1658 }
1659 // On fall through, another racing thread marked this nmethod before we did.
1660 return true;
1661 }
1662
1663 void nmethod::oops_do_marking_prologue() {
1664 log_trace(gc, nmethod)("oops_do_marking_prologue");
1665 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1666 // We use cmpxchg instead of regular assignment here because the user
1667 // may fork a bunch of threads, and we need them all to see the same state.
1668 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1669 guarantee(observed == NULL, "no races in this sequential code");
1670 }
1671
1672 void nmethod::oops_do_marking_epilogue() {
1673 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1674 nmethod* cur = _oops_do_mark_nmethods;
1675 while (cur != NMETHOD_SENTINEL) {
1676 assert(cur != NULL, "not NULL-terminated");
1677 nmethod* next = cur->_oops_do_mark_link;
1678 cur->_oops_do_mark_link = NULL;
1679 DEBUG_ONLY(cur->verify_oop_relocations());
1680
1681 LogTarget(Trace, gc, nmethod) lt;
1682 if (lt.is_enabled()) {
1683 LogStream ls(lt);
1684 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1685 }
1686 cur = next;
1687 }
1688 nmethod* required = _oops_do_mark_nmethods;
1689 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1690 guarantee(observed == required, "no races in this sequential code");
1691 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1692 }
1693
1694 class DetectScavengeRoot: public OopClosure {
1695 bool _detected_scavenge_root;
1696 nmethod* _print_nm;
1697 public:
1698 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1699
1700 bool detected_scavenge_root() { return _detected_scavenge_root; }
1701 virtual void do_oop(oop* p) {
1702 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1703 NOT_PRODUCT(maybe_print(p));
1704 _detected_scavenge_root = true;
1705 }
1706 }
1707 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1708
1709 #ifndef PRODUCT
1710 void maybe_print(oop* p) {
1711 LogTarget(Trace, gc, nmethod) lt;
1712 if (lt.is_enabled()) {
1713 LogStream ls(lt);
1714 if (!_detected_scavenge_root) {
1715 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1716 }
1717 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1718 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1719 p2i(*p), p2i(p));
1720 ls.cr();
1721 }
1722 }
1723 #endif //PRODUCT
1724 };
1725
1726 bool nmethod::detect_scavenge_root_oops() {
1727 DetectScavengeRoot detect_scavenge_root(this);
1728 oops_do(&detect_scavenge_root);
1729 return detect_scavenge_root.detected_scavenge_root();
1730 }
1731
1732 inline bool includes(void* p, void* from, void* to) {
1733 return from <= p && p < to;
1734 }
1735
1736
1737 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1738 assert(count >= 2, "must be sentinel values, at least");
1739
1740 #ifdef ASSERT
1741 // must be sorted and unique; we do a binary search in find_pc_desc()
1742 int prev_offset = pcs[0].pc_offset();
1743 assert(prev_offset == PcDesc::lower_offset_limit,
1744 "must start with a sentinel");
1745 for (int i = 1; i < count; i++) {
1746 int this_offset = pcs[i].pc_offset();
1747 assert(this_offset > prev_offset, "offsets must be sorted");
1748 prev_offset = this_offset;
1749 }
1750 assert(prev_offset == PcDesc::upper_offset_limit,
1751 "must end with a sentinel");
1752 #endif //ASSERT
1753
1754 // Search for MethodHandle invokes and tag the nmethod.
1755 for (int i = 0; i < count; i++) {
1756 if (pcs[i].is_method_handle_invoke()) {
1757 set_has_method_handle_invokes(true);
1758 break;
1759 }
1760 }
1761 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1762
1763 int size = count * sizeof(PcDesc);
1764 assert(scopes_pcs_size() >= size, "oob");
1765 memcpy(scopes_pcs_begin(), pcs, size);
1766
1767 // Adjust the final sentinel downward.
1768 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1769 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1770 last_pc->set_pc_offset(content_size() + 1);
1771 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1772 // Fill any rounding gaps with copies of the last record.
1773 last_pc[1] = last_pc[0];
1774 }
1775 // The following assert could fail if sizeof(PcDesc) is not
1776 // an integral multiple of oopSize (the rounding term).
1777 // If it fails, change the logic to always allocate a multiple
1778 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1779 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1780 }
1781
1782 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1783 assert(scopes_data_size() >= size, "oob");
1784 memcpy(scopes_data_begin(), buffer, size);
1785 }
1786
1787 #ifdef ASSERT
1788 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1789 PcDesc* lower = search.scopes_pcs_begin();
1790 PcDesc* upper = search.scopes_pcs_end();
1791 lower += 1; // exclude initial sentinel
1792 PcDesc* res = NULL;
1793 for (PcDesc* p = lower; p < upper; p++) {
1794 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1795 if (match_desc(p, pc_offset, approximate)) {
1796 if (res == NULL)
1797 res = p;
1798 else
1799 res = (PcDesc*) badAddress;
1800 }
1801 }
1802 return res;
1803 }
1804 #endif
1805
1806
1807 // Finds a PcDesc with real-pc equal to "pc"
1808 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1809 address base_address = search.code_begin();
1810 if ((pc < base_address) ||
1811 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1812 return NULL; // PC is wildly out of range
1813 }
1814 int pc_offset = (int) (pc - base_address);
1815
1816 // Check the PcDesc cache if it contains the desired PcDesc
1817 // (This as an almost 100% hit rate.)
1818 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1819 if (res != NULL) {
1820 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1821 return res;
1822 }
1823
1824 // Fallback algorithm: quasi-linear search for the PcDesc
1825 // Find the last pc_offset less than the given offset.
1826 // The successor must be the required match, if there is a match at all.
1827 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1828 PcDesc* lower = search.scopes_pcs_begin();
1829 PcDesc* upper = search.scopes_pcs_end();
1830 upper -= 1; // exclude final sentinel
1831 if (lower >= upper) return NULL; // native method; no PcDescs at all
1832
1833 #define assert_LU_OK \
1834 /* invariant on lower..upper during the following search: */ \
1835 assert(lower->pc_offset() < pc_offset, "sanity"); \
1836 assert(upper->pc_offset() >= pc_offset, "sanity")
1837 assert_LU_OK;
1838
1839 // Use the last successful return as a split point.
1840 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1841 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1842 if (mid->pc_offset() < pc_offset) {
1843 lower = mid;
1844 } else {
1845 upper = mid;
1846 }
1847
1848 // Take giant steps at first (4096, then 256, then 16, then 1)
1849 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1850 const int RADIX = (1 << LOG2_RADIX);
1851 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1852 while ((mid = lower + step) < upper) {
1853 assert_LU_OK;
1854 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1855 if (mid->pc_offset() < pc_offset) {
1856 lower = mid;
1857 } else {
1858 upper = mid;
1859 break;
1860 }
1861 }
1862 assert_LU_OK;
1863 }
1864
1865 // Sneak up on the value with a linear search of length ~16.
1866 while (true) {
1867 assert_LU_OK;
1868 mid = lower + 1;
1869 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1870 if (mid->pc_offset() < pc_offset) {
1871 lower = mid;
1872 } else {
1873 upper = mid;
1874 break;
1875 }
1876 }
1877 #undef assert_LU_OK
1878
1879 if (match_desc(upper, pc_offset, approximate)) {
1880 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1881 _pc_desc_cache.add_pc_desc(upper);
1882 return upper;
1883 } else {
1884 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1885 return NULL;
1886 }
1887 }
1888
1889
1890 void nmethod::check_all_dependencies(DepChange& changes) {
1891 // Checked dependencies are allocated into this ResourceMark
1892 ResourceMark rm;
1893
1894 // Turn off dependency tracing while actually testing dependencies.
1895 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1896
1897 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1898 &DependencySignature::equals, 11027> DepTable;
1899
1900 DepTable* table = new DepTable();
1901
1902 // Iterate over live nmethods and check dependencies of all nmethods that are not
1903 // marked for deoptimization. A particular dependency is only checked once.
1904 NMethodIterator iter;
1905 while(iter.next()) {
1906 nmethod* nm = iter.method();
1907 // Only notify for live nmethods
1908 if (nm->is_alive() && !(nm->is_marked_for_deoptimization() || nm->is_unloading())) {
1909 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1910 // Construct abstraction of a dependency.
1911 DependencySignature* current_sig = new DependencySignature(deps);
1912
1913 // Determine if dependency is already checked. table->put(...) returns
1914 // 'true' if the dependency is added (i.e., was not in the hashtable).
1915 if (table->put(*current_sig, 1)) {
1916 if (deps.check_dependency() != NULL) {
1917 // Dependency checking failed. Print out information about the failed
1918 // dependency and finally fail with an assert. We can fail here, since
1919 // dependency checking is never done in a product build.
1920 tty->print_cr("Failed dependency:");
1921 changes.print();
1922 nm->print();
1923 nm->print_dependencies();
1924 assert(false, "Should have been marked for deoptimization");
1925 }
1926 }
1927 }
1928 }
1929 }
1930 }
1931
1932 bool nmethod::check_dependency_on(DepChange& changes) {
1933 // What has happened:
1934 // 1) a new class dependee has been added
1935 // 2) dependee and all its super classes have been marked
1936 bool found_check = false; // set true if we are upset
1937 for (Dependencies::DepStream deps(this); deps.next(); ) {
1938 // Evaluate only relevant dependencies.
1939 if (deps.spot_check_dependency_at(changes) != NULL) {
1940 found_check = true;
1941 NOT_DEBUG(break);
1942 }
1943 }
1944 return found_check;
1945 }
1946
1947 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1948 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1949 Array<Method*>* dependee_methods = dependee_ik->methods();
1950 for (Dependencies::DepStream deps(this); deps.next(); ) {
1951 if (deps.type() == Dependencies::evol_method) {
1952 Method* method = deps.method_argument(0);
1953 for (int j = 0; j < dependee_methods->length(); j++) {
1954 if (dependee_methods->at(j) == method) {
1955 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1956 ResourceMark rm;
1957 log_debug(redefine, class, nmethod)
1958 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1959 _method->method_holder()->external_name(),
1960 _method->name()->as_C_string(),
1961 _method->signature()->as_C_string(),
1962 compile_id(),
1963 method->method_holder()->external_name(),
1964 method->name()->as_C_string(),
1965 method->signature()->as_C_string());
1966 }
1967 if (TraceDependencies || LogCompilation)
1968 deps.log_dependency(dependee);
1969 return true;
1970 }
1971 }
1972 }
1973 }
1974 return false;
1975 }
1976
1977 // Called from mark_for_deoptimization, when dependee is invalidated.
1978 bool nmethod::is_dependent_on_method(Method* dependee) {
1979 for (Dependencies::DepStream deps(this); deps.next(); ) {
1980 if (deps.type() != Dependencies::evol_method)
1981 continue;
1982 Method* method = deps.method_argument(0);
1983 if (method == dependee) return true;
1984 }
1985 return false;
1986 }
1987
1988
1989 bool nmethod::is_patchable_at(address instr_addr) {
1990 assert(insts_contains(instr_addr), "wrong nmethod used");
1991 if (is_zombie()) {
1992 // a zombie may never be patched
1993 return false;
1994 }
1995 return true;
1996 }
1997
1998
1999 address nmethod::continuation_for_implicit_exception(address pc) {
2000 // Exception happened outside inline-cache check code => we are inside
2001 // an active nmethod => use cpc to determine a return address
2002 int exception_offset = pc - code_begin();
2003 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2004 #ifdef ASSERT
2005 if (cont_offset == 0) {
2006 Thread* thread = Thread::current();
2007 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2008 HandleMark hm(thread);
2009 ResourceMark rm(thread);
2010 CodeBlob* cb = CodeCache::find_blob(pc);
2011 assert(cb != NULL && cb == this, "");
2012 ttyLocker ttyl;
2013 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2014 print();
2015 method()->print_codes();
2016 print_code();
2017 print_pcs();
2018 }
2019 #endif
2020 if (cont_offset == 0) {
2021 // Let the normal error handling report the exception
2022 return NULL;
2023 }
2024 return code_begin() + cont_offset;
2025 }
2026
2027
2028
2029 void nmethod_init() {
2030 // make sure you didn't forget to adjust the filler fields
2031 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2032 }
2033
2034
2035 //-------------------------------------------------------------------------------------------
2036
2037
2038 // QQQ might we make this work from a frame??
2039 nmethodLocker::nmethodLocker(address pc) {
2040 CodeBlob* cb = CodeCache::find_blob(pc);
2041 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2042 _nm = cb->as_compiled_method();
2043 lock_nmethod(_nm);
2044 }
2045
2046 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2047 // should pass zombie_ok == true.
2048 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2049 if (cm == NULL) return;
2050 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2051 nmethod* nm = cm->as_nmethod();
2052 Atomic::inc(&nm->_lock_count);
2053 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2054 }
2055
2056 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2057 if (cm == NULL) return;
2058 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2059 nmethod* nm = cm->as_nmethod();
2060 Atomic::dec(&nm->_lock_count);
2061 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2062 }
2063
2064
2065 // -----------------------------------------------------------------------------
2066 // Verification
2067
2068 class VerifyOopsClosure: public OopClosure {
2069 nmethod* _nm;
2070 bool _ok;
2071 public:
2072 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2073 bool ok() { return _ok; }
2074 virtual void do_oop(oop* p) {
2075 if (oopDesc::is_oop_or_null(*p)) return;
2076 if (_ok) {
2077 _nm->print_nmethod(true);
2078 _ok = false;
2079 }
2080 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2081 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2082 }
2083 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2084 };
2085
2086 void nmethod::verify() {
2087
2088 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2089 // seems odd.
2090
2091 if (is_zombie() || is_not_entrant() || is_unloaded())
2092 return;
2093
2094 // Make sure all the entry points are correctly aligned for patching.
2095 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2096
2097 // assert(oopDesc::is_oop(method()), "must be valid");
2098
2099 ResourceMark rm;
2100
2101 if (!CodeCache::contains(this)) {
2102 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2103 }
2104
2105 if(is_native_method() )
2106 return;
2107
2108 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2109 if (nm != this) {
2110 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2111 }
2112
2113 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2114 if (! p->verify(this)) {
2115 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2116 }
2117 }
2118
2119 VerifyOopsClosure voc(this);
2120 oops_do(&voc);
2121 assert(voc.ok(), "embedded oops must be OK");
2122 Universe::heap()->verify_nmethod(this);
2123
2124 verify_scopes();
2125 }
2126
2127
2128 void nmethod::verify_interrupt_point(address call_site) {
2129 // Verify IC only when nmethod installation is finished.
2130 if (!is_not_installed()) {
2131 Thread *cur = Thread::current();
2132 if (CompiledIC_lock->owner() == cur ||
2133 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2134 SafepointSynchronize::is_at_safepoint())) {
2135 CompiledIC_at(this, call_site);
2136 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2137 } else {
2138 MutexLocker ml_verify (CompiledIC_lock);
2139 CompiledIC_at(this, call_site);
2140 }
2141 }
2142
2143 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2144 assert(pd != NULL, "PcDesc must exist");
2145 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2146 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2147 pd->return_oop());
2148 !sd->is_top(); sd = sd->sender()) {
2149 sd->verify();
2150 }
2151 }
2152
2153 void nmethod::verify_scopes() {
2154 if( !method() ) return; // Runtime stubs have no scope
2155 if (method()->is_native()) return; // Ignore stub methods.
2156 // iterate through all interrupt point
2157 // and verify the debug information is valid.
2158 RelocIterator iter((nmethod*)this);
2159 while (iter.next()) {
2160 address stub = NULL;
2161 switch (iter.type()) {
2162 case relocInfo::virtual_call_type:
2163 verify_interrupt_point(iter.addr());
2164 break;
2165 case relocInfo::opt_virtual_call_type:
2166 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2167 verify_interrupt_point(iter.addr());
2168 break;
2169 case relocInfo::static_call_type:
2170 stub = iter.static_call_reloc()->static_stub(false);
2171 //verify_interrupt_point(iter.addr());
2172 break;
2173 case relocInfo::runtime_call_type:
2174 case relocInfo::runtime_call_w_cp_type: {
2175 address destination = iter.reloc()->value();
2176 // Right now there is no way to find out which entries support
2177 // an interrupt point. It would be nice if we had this
2178 // information in a table.
2179 break;
2180 }
2181 default:
2182 break;
2183 }
2184 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2185 }
2186 }
2187
2188
2189 // -----------------------------------------------------------------------------
2190 // Non-product code
2191 #ifndef PRODUCT
2192
2193 class DebugScavengeRoot: public OopClosure {
2194 nmethod* _nm;
2195 bool _ok;
2196 public:
2197 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2198 bool ok() { return _ok; }
2199 virtual void do_oop(oop* p) {
2200 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2201 if (_ok) {
2202 _nm->print_nmethod(true);
2203 _ok = false;
2204 }
2205 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2206 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2207 (*p)->print();
2208 }
2209 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2210 };
2211
2212 void nmethod::verify_scavenge_root_oops() {
2213 if (!on_scavenge_root_list()) {
2214 // Actually look inside, to verify the claim that it's clean.
2215 DebugScavengeRoot debug_scavenge_root(this);
2216 oops_do(&debug_scavenge_root);
2217 if (!debug_scavenge_root.ok())
2218 fatal("found an unadvertised bad scavengable oop in the code cache");
2219 }
2220 assert(scavenge_root_not_marked(), "");
2221 }
2222
2223 #endif // PRODUCT
2224
2225 // Printing operations
2226
2227 void nmethod::print() const {
2228 ResourceMark rm;
2229 ttyLocker ttyl; // keep the following output all in one block
2230
2231 tty->print("Compiled method ");
2232
2233 if (is_compiled_by_c1()) {
2234 tty->print("(c1) ");
2235 } else if (is_compiled_by_c2()) {
2236 tty->print("(c2) ");
2237 } else if (is_compiled_by_jvmci()) {
2238 tty->print("(JVMCI) ");
2239 } else {
2240 tty->print("(nm) ");
2241 }
2242
2243 print_on(tty, NULL);
2244
2245 if (WizardMode) {
2246 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2247 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2248 tty->print(" { ");
2249 tty->print_cr("%s ", state());
2250 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2251 tty->print_cr("}:");
2252 }
2253 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2254 p2i(this),
2255 p2i(this) + size(),
2256 size());
2257 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2258 p2i(relocation_begin()),
2259 p2i(relocation_end()),
2260 relocation_size());
2261 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2262 p2i(consts_begin()),
2263 p2i(consts_end()),
2264 consts_size());
2265 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(insts_begin()),
2267 p2i(insts_end()),
2268 insts_size());
2269 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(stub_begin()),
2271 p2i(stub_end()),
2272 stub_size());
2273 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(oops_begin()),
2275 p2i(oops_end()),
2276 oops_size());
2277 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(metadata_begin()),
2279 p2i(metadata_end()),
2280 metadata_size());
2281 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 p2i(scopes_data_begin()),
2283 p2i(scopes_data_end()),
2284 scopes_data_size());
2285 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 p2i(scopes_pcs_begin()),
2287 p2i(scopes_pcs_end()),
2288 scopes_pcs_size());
2289 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(dependencies_begin()),
2291 p2i(dependencies_end()),
2292 dependencies_size());
2293 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(handler_table_begin()),
2295 p2i(handler_table_end()),
2296 handler_table_size());
2297 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 p2i(nul_chk_table_begin()),
2299 p2i(nul_chk_table_end()),
2300 nul_chk_table_size());
2301 }
2302
2303 #ifndef PRODUCT
2304
2305 void nmethod::print_scopes() {
2306 // Find the first pc desc for all scopes in the code and print it.
2307 ResourceMark rm;
2308 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2309 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2310 continue;
2311
2312 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2313 while (sd != NULL) {
2314 sd->print_on(tty, p);
2315 sd = sd->sender();
2316 }
2317 }
2318 }
2319
2320 void nmethod::print_dependencies() {
2321 ResourceMark rm;
2322 ttyLocker ttyl; // keep the following output all in one block
2323 tty->print_cr("Dependencies:");
2324 for (Dependencies::DepStream deps(this); deps.next(); ) {
2325 deps.print_dependency();
2326 Klass* ctxk = deps.context_type();
2327 if (ctxk != NULL) {
2328 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2329 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2330 }
2331 }
2332 deps.log_dependency(); // put it into the xml log also
2333 }
2334 }
2335
2336
2337 void nmethod::print_relocations() {
2338 ResourceMark m; // in case methods get printed via the debugger
2339 tty->print_cr("relocations:");
2340 RelocIterator iter(this);
2341 iter.print();
2342 }
2343
2344
2345 void nmethod::print_pcs() {
2346 ResourceMark m; // in case methods get printed via debugger
2347 tty->print_cr("pc-bytecode offsets:");
2348 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2349 p->print(this);
2350 }
2351 }
2352
2353 void nmethod::print_recorded_oops() {
2354 tty->print_cr("Recorded oops:");
2355 for (int i = 0; i < oops_count(); i++) {
2356 oop o = oop_at(i);
2357 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2358 if (o == (oop)Universe::non_oop_word()) {
2359 tty->print("non-oop word");
2360 } else {
2361 if (o != NULL) {
2362 o->print_value();
2363 } else {
2364 tty->print_cr("NULL");
2365 }
2366 }
2367 tty->cr();
2368 }
2369 }
2370
2371 void nmethod::print_recorded_metadata() {
2372 tty->print_cr("Recorded metadata:");
2373 for (int i = 0; i < metadata_count(); i++) {
2374 Metadata* m = metadata_at(i);
2375 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2376 if (m == (Metadata*)Universe::non_oop_word()) {
2377 tty->print("non-metadata word");
2378 } else {
2379 Metadata::print_value_on_maybe_null(tty, m);
2380 }
2381 tty->cr();
2382 }
2383 }
2384
2385 #endif // PRODUCT
2386
2387 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2388 RelocIterator iter(this, begin, end);
2389 bool have_one = false;
2390 while (iter.next()) {
2391 have_one = true;
2392 switch (iter.type()) {
2393 case relocInfo::none: return "no_reloc";
2394 case relocInfo::oop_type: {
2395 stringStream st;
2396 oop_Relocation* r = iter.oop_reloc();
2397 oop obj = r->oop_value();
2398 st.print("oop(");
2399 if (obj == NULL) st.print("NULL");
2400 else obj->print_value_on(&st);
2401 st.print(")");
2402 return st.as_string();
2403 }
2404 case relocInfo::metadata_type: {
2405 stringStream st;
2406 metadata_Relocation* r = iter.metadata_reloc();
2407 Metadata* obj = r->metadata_value();
2408 st.print("metadata(");
2409 if (obj == NULL) st.print("NULL");
2410 else obj->print_value_on(&st);
2411 st.print(")");
2412 return st.as_string();
2413 }
2414 case relocInfo::runtime_call_type:
2415 case relocInfo::runtime_call_w_cp_type: {
2416 stringStream st;
2417 st.print("runtime_call");
2418 CallRelocation* r = (CallRelocation*)iter.reloc();
2419 address dest = r->destination();
2420 CodeBlob* cb = CodeCache::find_blob(dest);
2421 if (cb != NULL) {
2422 st.print(" %s", cb->name());
2423 } else {
2424 ResourceMark rm;
2425 const int buflen = 1024;
2426 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2427 int offset;
2428 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2429 st.print(" %s", buf);
2430 if (offset != 0) {
2431 st.print("+%d", offset);
2432 }
2433 }
2434 }
2435 return st.as_string();
2436 }
2437 case relocInfo::virtual_call_type: {
2438 stringStream st;
2439 st.print_raw("virtual_call");
2440 virtual_call_Relocation* r = iter.virtual_call_reloc();
2441 Method* m = r->method_value();
2442 if (m != NULL) {
2443 assert(m->is_method(), "");
2444 m->print_short_name(&st);
2445 }
2446 return st.as_string();
2447 }
2448 case relocInfo::opt_virtual_call_type: {
2449 stringStream st;
2450 st.print_raw("optimized virtual_call");
2451 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2452 Method* m = r->method_value();
2453 if (m != NULL) {
2454 assert(m->is_method(), "");
2455 m->print_short_name(&st);
2456 }
2457 return st.as_string();
2458 }
2459 case relocInfo::static_call_type: {
2460 stringStream st;
2461 st.print_raw("static_call");
2462 static_call_Relocation* r = iter.static_call_reloc();
2463 Method* m = r->method_value();
2464 if (m != NULL) {
2465 assert(m->is_method(), "");
2466 m->print_short_name(&st);
2467 }
2468 return st.as_string();
2469 }
2470 case relocInfo::static_stub_type: return "static_stub";
2471 case relocInfo::external_word_type: return "external_word";
2472 case relocInfo::internal_word_type: return "internal_word";
2473 case relocInfo::section_word_type: return "section_word";
2474 case relocInfo::poll_type: return "poll";
2475 case relocInfo::poll_return_type: return "poll_return";
2476 case relocInfo::type_mask: return "type_bit_mask";
2477
2478 default:
2479 break;
2480 }
2481 }
2482 return have_one ? "other" : NULL;
2483 }
2484
2485 // Return a the last scope in (begin..end]
2486 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2487 PcDesc* p = pc_desc_near(begin+1);
2488 if (p != NULL && p->real_pc(this) <= end) {
2489 return new ScopeDesc(this, p->scope_decode_offset(),
2490 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2491 p->return_oop());
2492 }
2493 return NULL;
2494 }
2495
2496 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2497 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2498 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2499 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2500 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2501 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2502
2503 if (has_method_handle_invokes())
2504 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2505
2506 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2507
2508 if (block_begin == entry_point()) {
2509 methodHandle m = method();
2510 if (m.not_null()) {
2511 stream->print(" # ");
2512 m->print_value_on(stream);
2513 stream->cr();
2514 }
2515 if (m.not_null() && !is_osr_method()) {
2516 ResourceMark rm;
2517 int sizeargs = m->size_of_parameters();
2518 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2519 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2520 {
2521 int sig_index = 0;
2522 if (!m->is_static())
2523 sig_bt[sig_index++] = T_OBJECT; // 'this'
2524 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2525 BasicType t = ss.type();
2526 sig_bt[sig_index++] = t;
2527 if (type2size[t] == 2) {
2528 sig_bt[sig_index++] = T_VOID;
2529 } else {
2530 assert(type2size[t] == 1, "size is 1 or 2");
2531 }
2532 }
2533 assert(sig_index == sizeargs, "");
2534 }
2535 const char* spname = "sp"; // make arch-specific?
2536 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2537 int stack_slot_offset = this->frame_size() * wordSize;
2538 int tab1 = 14, tab2 = 24;
2539 int sig_index = 0;
2540 int arg_index = (m->is_static() ? 0 : -1);
2541 bool did_old_sp = false;
2542 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2543 bool at_this = (arg_index == -1);
2544 bool at_old_sp = false;
2545 BasicType t = (at_this ? T_OBJECT : ss.type());
2546 assert(t == sig_bt[sig_index], "sigs in sync");
2547 if (at_this)
2548 stream->print(" # this: ");
2549 else
2550 stream->print(" # parm%d: ", arg_index);
2551 stream->move_to(tab1);
2552 VMReg fst = regs[sig_index].first();
2553 VMReg snd = regs[sig_index].second();
2554 if (fst->is_reg()) {
2555 stream->print("%s", fst->name());
2556 if (snd->is_valid()) {
2557 stream->print(":%s", snd->name());
2558 }
2559 } else if (fst->is_stack()) {
2560 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2561 if (offset == stack_slot_offset) at_old_sp = true;
2562 stream->print("[%s+0x%x]", spname, offset);
2563 } else {
2564 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2565 }
2566 stream->print(" ");
2567 stream->move_to(tab2);
2568 stream->print("= ");
2569 if (at_this) {
2570 m->method_holder()->print_value_on(stream);
2571 } else {
2572 bool did_name = false;
2573 if (!at_this && ss.is_object()) {
2574 Symbol* name = ss.as_symbol_or_null();
2575 if (name != NULL) {
2576 name->print_value_on(stream);
2577 did_name = true;
2578 }
2579 }
2580 if (!did_name)
2581 stream->print("%s", type2name(t));
2582 }
2583 if (at_old_sp) {
2584 stream->print(" (%s of caller)", spname);
2585 did_old_sp = true;
2586 }
2587 stream->cr();
2588 sig_index += type2size[t];
2589 arg_index += 1;
2590 if (!at_this) ss.next();
2591 }
2592 if (!did_old_sp) {
2593 stream->print(" # ");
2594 stream->move_to(tab1);
2595 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2596 stream->print(" (%s of caller)", spname);
2597 stream->cr();
2598 }
2599 }
2600 }
2601 }
2602
2603 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2604 // First, find an oopmap in (begin, end].
2605 // We use the odd half-closed interval so that oop maps and scope descs
2606 // which are tied to the byte after a call are printed with the call itself.
2607 address base = code_begin();
2608 ImmutableOopMapSet* oms = oop_maps();
2609 if (oms != NULL) {
2610 for (int i = 0, imax = oms->count(); i < imax; i++) {
2611 const ImmutableOopMapPair* pair = oms->pair_at(i);
2612 const ImmutableOopMap* om = pair->get_from(oms);
2613 address pc = base + pair->pc_offset();
2614 if (pc > begin) {
2615 if (pc <= end) {
2616 st->move_to(column);
2617 st->print("; ");
2618 om->print_on(st);
2619 }
2620 break;
2621 }
2622 }
2623 }
2624
2625 // Print any debug info present at this pc.
2626 ScopeDesc* sd = scope_desc_in(begin, end);
2627 if (sd != NULL) {
2628 st->move_to(column);
2629 if (sd->bci() == SynchronizationEntryBCI) {
2630 st->print(";*synchronization entry");
2631 } else if (sd->bci() == AfterBci) {
2632 st->print(";* method exit (unlocked if synchronized)");
2633 } else if (sd->bci() == UnwindBci) {
2634 st->print(";* unwind (locked if synchronized)");
2635 } else if (sd->bci() == AfterExceptionBci) {
2636 st->print(";* unwind (unlocked if synchronized)");
2637 } else if (sd->bci() == UnknownBci) {
2638 st->print(";* unknown");
2639 } else if (sd->bci() == InvalidFrameStateBci) {
2640 st->print(";* invalid frame state");
2641 } else {
2642 if (sd->method() == NULL) {
2643 st->print("method is NULL");
2644 } else if (sd->method()->is_native()) {
2645 st->print("method is native");
2646 } else {
2647 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2648 st->print(";*%s", Bytecodes::name(bc));
2649 switch (bc) {
2650 case Bytecodes::_invokevirtual:
2651 case Bytecodes::_invokespecial:
2652 case Bytecodes::_invokestatic:
2653 case Bytecodes::_invokeinterface:
2654 {
2655 Bytecode_invoke invoke(sd->method(), sd->bci());
2656 st->print(" ");
2657 if (invoke.name() != NULL)
2658 invoke.name()->print_symbol_on(st);
2659 else
2660 st->print("<UNKNOWN>");
2661 break;
2662 }
2663 case Bytecodes::_getfield:
2664 case Bytecodes::_putfield:
2665 case Bytecodes::_getstatic:
2666 case Bytecodes::_putstatic:
2667 {
2668 Bytecode_field field(sd->method(), sd->bci());
2669 st->print(" ");
2670 if (field.name() != NULL)
2671 field.name()->print_symbol_on(st);
2672 else
2673 st->print("<UNKNOWN>");
2674 }
2675 default:
2676 break;
2677 }
2678 }
2679 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2680 }
2681
2682 // Print all scopes
2683 for (;sd != NULL; sd = sd->sender()) {
2684 st->move_to(column);
2685 st->print("; -");
2686 if (sd->method() == NULL) {
2687 st->print("method is NULL");
2688 } else {
2689 sd->method()->print_short_name(st);
2690 }
2691 int lineno = sd->method()->line_number_from_bci(sd->bci());
2692 if (lineno != -1) {
2693 st->print("@%d (line %d)", sd->bci(), lineno);
2694 } else {
2695 st->print("@%d", sd->bci());
2696 }
2697 st->cr();
2698 }
2699 }
2700
2701 // Print relocation information
2702 const char* str = reloc_string_for(begin, end);
2703 if (str != NULL) {
2704 if (sd != NULL) st->cr();
2705 st->move_to(column);
2706 st->print("; {%s}", str);
2707 }
2708 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2709 if (cont_offset != 0) {
2710 st->move_to(column);
2711 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2712 }
2713
2714 }
2715
2716 class DirectNativeCallWrapper: public NativeCallWrapper {
2717 private:
2718 NativeCall* _call;
2719
2720 public:
2721 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2722
2723 virtual address destination() const { return _call->destination(); }
2724 virtual address instruction_address() const { return _call->instruction_address(); }
2725 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2726 virtual address return_address() const { return _call->return_address(); }
2727
2728 virtual address get_resolve_call_stub(bool is_optimized) const {
2729 if (is_optimized) {
2730 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2731 }
2732 return SharedRuntime::get_resolve_virtual_call_stub();
2733 }
2734
2735 virtual void set_destination_mt_safe(address dest, bool is_safe = false) {
2736 #if INCLUDE_AOT
2737 if (UseAOT) {
2738 CodeBlob* callee = CodeCache::find_blob(dest);
2739 CompiledMethod* cm = callee->as_compiled_method_or_null();
2740 if (cm != NULL && cm->is_far_code()) {
2741 // Temporary fix, see JDK-8143106
2742 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2743 csc->set_to_far(methodHandle(cm->method()), dest);
2744 return;
2745 }
2746 }
2747 #endif
2748 _call->set_destination_mt_safe(dest, is_safe);
2749 }
2750
2751 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2752 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2753 #if INCLUDE_AOT
2754 if (info.to_aot()) {
2755 csc->set_to_far(method, info.entry());
2756 } else
2757 #endif
2758 {
2759 csc->set_to_interpreted(method, info.entry());
2760 }
2761 }
2762
2763 virtual void verify() const {
2764 // make sure code pattern is actually a call imm32 instruction
2765 _call->verify();
2766 if (os::is_MP()) {
2767 _call->verify_alignment();
2768 }
2769 }
2770
2771 virtual void verify_resolve_call(address dest) const {
2772 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2773 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2774 }
2775
2776 virtual bool is_call_to_interpreted(address dest) const {
2777 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2778 return cb->contains(dest);
2779 }
2780
2781 virtual bool is_safe_for_patching() const { return false; }
2782
2783 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2784 return nativeMovConstReg_at(r->cached_value());
2785 }
2786
2787 virtual void *get_data(NativeInstruction* instruction) const {
2788 return (void*)((NativeMovConstReg*) instruction)->data();
2789 }
2790
2791 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2792 ((NativeMovConstReg*) instruction)->set_data(data);
2793 }
2794 };
2795
2796 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2797 return new DirectNativeCallWrapper((NativeCall*) call);
2798 }
2799
2800 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2801 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2802 }
2803
2804 address nmethod::call_instruction_address(address pc) const {
2805 if (NativeCall::is_call_before(pc)) {
2806 NativeCall *ncall = nativeCall_before(pc);
2807 return ncall->instruction_address();
2808 }
2809 return NULL;
2810 }
2811
2812 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2813 return CompiledDirectStaticCall::at(call_site);
2814 }
2815
2816 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2817 return CompiledDirectStaticCall::at(call_site);
2818 }
2819
2820 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2821 return CompiledDirectStaticCall::before(return_addr);
2822 }
2823
2824 #ifndef PRODUCT
2825
2826 void nmethod::print_value_on(outputStream* st) const {
2827 st->print("nmethod");
2828 print_on(st, NULL);
2829 }
2830
2831 void nmethod::print_calls(outputStream* st) {
2832 RelocIterator iter(this);
2833 while (iter.next()) {
2834 switch (iter.type()) {
2835 case relocInfo::virtual_call_type:
2836 case relocInfo::opt_virtual_call_type: {
2837 VerifyMutexLocker mc(CompiledIC_lock);
2838 CompiledIC_at(&iter)->print();
2839 break;
2840 }
2841 case relocInfo::static_call_type:
2842 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2843 CompiledDirectStaticCall::at(iter.reloc())->print();
2844 break;
2845 default:
2846 break;
2847 }
2848 }
2849 }
2850
2851 void nmethod::print_handler_table() {
2852 ExceptionHandlerTable(this).print();
2853 }
2854
2855 void nmethod::print_nul_chk_table() {
2856 ImplicitExceptionTable(this).print(code_begin());
2857 }
2858
2859 void nmethod::print_statistics() {
2860 ttyLocker ttyl;
2861 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2862 native_nmethod_stats.print_native_nmethod_stats();
2863 #ifdef COMPILER1
2864 c1_java_nmethod_stats.print_nmethod_stats("C1");
2865 #endif
2866 #ifdef COMPILER2
2867 c2_java_nmethod_stats.print_nmethod_stats("C2");
2868 #endif
2869 #if INCLUDE_JVMCI
2870 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2871 #endif
2872 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2873 DebugInformationRecorder::print_statistics();
2874 #ifndef PRODUCT
2875 pc_nmethod_stats.print_pc_stats();
2876 #endif
2877 Dependencies::print_statistics();
2878 if (xtty != NULL) xtty->tail("statistics");
2879 }
2880
2881 #endif // !PRODUCT
2882
2883 #if INCLUDE_JVMCI
2884 void nmethod::clear_jvmci_installed_code() {
2885 assert_locked_or_safepoint(Patching_lock);
2886 if (_jvmci_installed_code != NULL) {
2887 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2888 _jvmci_installed_code = NULL;
2889 }
2890 }
2891
2892 void nmethod::clear_speculation_log() {
2893 assert_locked_or_safepoint(Patching_lock);
2894 if (_speculation_log != NULL) {
2895 JNIHandles::destroy_weak_global(_speculation_log);
2896 _speculation_log = NULL;
2897 }
2898 }
2899
2900 void nmethod::maybe_invalidate_installed_code() {
2901 MutexLockerEx m(!SafepointSynchronize::is_at_safepoint() &&
2902 !Patching_lock->owned_by_self() ? Patching_lock : NULL,
2903 Mutex::_no_safepoint_check_flag);
2904 assert(Patching_lock->is_locked() ||
2905 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2906 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2907 if (installed_code != NULL) {
2908 // Update the values in the InstalledCode instance if it still refers to this nmethod
2909 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2910 if (nm == this) {
2911 if (!is_alive() || is_unloading()) {
2912 // Break the link between nmethod and InstalledCode such that the nmethod
2913 // can subsequently be flushed safely. The link must be maintained while
2914 // the method could have live activations since invalidateInstalledCode
2915 // might want to invalidate all existing activations.
2916 InstalledCode::set_address(installed_code, 0);
2917 InstalledCode::set_entryPoint(installed_code, 0);
2918 } else if (is_not_entrant()) {
2919 // Remove the entry point so any invocation will fail but keep
2920 // the address link around that so that existing activations can
2921 // be invalidated.
2922 InstalledCode::set_entryPoint(installed_code, 0);
2923 }
2924 }
2925 }
2926 if (!is_alive() || is_unloading()) {
2927 // Clear these out after the nmethod has been unregistered and any
2928 // updates to the InstalledCode instance have been performed.
2929 clear_jvmci_installed_code();
2930 clear_speculation_log();
2931 }
2932 }
2933
2934 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2935 if (installedCode() == NULL) {
2936 THROW(vmSymbols::java_lang_NullPointerException());
2937 }
2938 jlong nativeMethod = InstalledCode::address(installedCode);
2939 nmethod* nm = (nmethod*)nativeMethod;
2940 if (nm == NULL) {
2941 // Nothing to do
2942 return;
2943 }
2944
2945 nmethodLocker nml(nm);
2946 #ifdef ASSERT
2947 {
2948 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2949 // This relationship can only be checked safely under a lock
2950 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2951 }
2952 #endif
2953
2954 if (nm->is_alive()) {
2955 // Invalidating the InstalledCode means we want the nmethod
2956 // to be deoptimized.
2957 nm->mark_for_deoptimization();
2958 VM_Deoptimize op;
2959 VMThread::execute(&op);
2960 }
2961
2962 // Multiple threads could reach this point so we now need to
2963 // lock and re-check the link to the nmethod so that only one
2964 // thread clears it.
2965 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2966 if (InstalledCode::address(installedCode) == nativeMethod) {
2967 InstalledCode::set_address(installedCode, 0);
2968 }
2969 }
2970
2971 oop nmethod::jvmci_installed_code() {
2972 return JNIHandles::resolve(_jvmci_installed_code);
2973 }
2974
2975 oop nmethod::speculation_log() {
2976 return JNIHandles::resolve(_speculation_log);
2977 }
2978
2979 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2980 if (!this->is_compiled_by_jvmci()) {
2981 return NULL;
2982 }
2983 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2984 if (installed_code != NULL) {
2985 oop installed_code_name = NULL;
2986 if (installed_code->is_a(InstalledCode::klass())) {
2987 installed_code_name = InstalledCode::name(installed_code);
2988 }
2989 if (installed_code_name != NULL) {
2990 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2991 }
2992 }
2993 return NULL;
2994 }
2995 #endif