1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/method.inline.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "prims/jvmtiImpl.hpp"
49 #include "runtime/atomic.hpp"
50 #include "runtime/flags/flagSetting.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/jniHandles.inline.hpp"
54 #include "runtime/orderAccess.hpp"
55 #include "runtime/os.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/sweeper.hpp"
59 #include "runtime/vmThread.hpp"
60 #include "utilities/align.hpp"
61 #include "utilities/dtrace.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/resourceHash.hpp"
64 #include "utilities/xmlstream.hpp"
65 #if INCLUDE_JVMCI
66 #include "jvmci/jvmciJavaClasses.hpp"
67 #endif
68
69 #ifdef DTRACE_ENABLED
70
71 // Only bother with this argument setup if dtrace is available
72
73 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
74 { \
75 Method* m = (method); \
76 if (m != NULL) { \
77 Symbol* klass_name = m->klass_name(); \
78 Symbol* name = m->name(); \
79 Symbol* signature = m->signature(); \
80 HOTSPOT_COMPILED_METHOD_UNLOAD( \
81 (char *) klass_name->bytes(), klass_name->utf8_length(), \
82 (char *) name->bytes(), name->utf8_length(), \
83 (char *) signature->bytes(), signature->utf8_length()); \
84 } \
85 }
86
87 #else // ndef DTRACE_ENABLED
88
89 #define DTRACE_METHOD_UNLOAD_PROBE(method)
90
91 #endif
92
93 //---------------------------------------------------------------------------------
94 // NMethod statistics
95 // They are printed under various flags, including:
96 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
97 // (In the latter two cases, they like other stats are printed to the log only.)
98
99 #ifndef PRODUCT
100 // These variables are put into one block to reduce relocations
101 // and make it simpler to print from the debugger.
102 struct java_nmethod_stats_struct {
103 int nmethod_count;
104 int total_size;
105 int relocation_size;
106 int consts_size;
107 int insts_size;
108 int stub_size;
109 int scopes_data_size;
110 int scopes_pcs_size;
111 int dependencies_size;
112 int handler_table_size;
113 int nul_chk_table_size;
114 int oops_size;
115 int metadata_size;
116
117 void note_nmethod(nmethod* nm) {
118 nmethod_count += 1;
119 total_size += nm->size();
120 relocation_size += nm->relocation_size();
121 consts_size += nm->consts_size();
122 insts_size += nm->insts_size();
123 stub_size += nm->stub_size();
124 oops_size += nm->oops_size();
125 metadata_size += nm->metadata_size();
126 scopes_data_size += nm->scopes_data_size();
127 scopes_pcs_size += nm->scopes_pcs_size();
128 dependencies_size += nm->dependencies_size();
129 handler_table_size += nm->handler_table_size();
130 nul_chk_table_size += nm->nul_chk_table_size();
131 }
132 void print_nmethod_stats(const char* name) {
133 if (nmethod_count == 0) return;
134 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
135 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
136 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
137 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
138 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
139 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
140 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
141 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
142 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
143 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
144 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
145 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
146 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
147 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
148 }
149 };
150
151 struct native_nmethod_stats_struct {
152 int native_nmethod_count;
153 int native_total_size;
154 int native_relocation_size;
155 int native_insts_size;
156 int native_oops_size;
157 int native_metadata_size;
158 void note_native_nmethod(nmethod* nm) {
159 native_nmethod_count += 1;
160 native_total_size += nm->size();
161 native_relocation_size += nm->relocation_size();
162 native_insts_size += nm->insts_size();
163 native_oops_size += nm->oops_size();
164 native_metadata_size += nm->metadata_size();
165 }
166 void print_native_nmethod_stats() {
167 if (native_nmethod_count == 0) return;
168 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
169 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
170 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
171 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
172 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
173 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
174 }
175 };
176
177 struct pc_nmethod_stats_struct {
178 int pc_desc_resets; // number of resets (= number of caches)
179 int pc_desc_queries; // queries to nmethod::find_pc_desc
180 int pc_desc_approx; // number of those which have approximate true
181 int pc_desc_repeats; // number of _pc_descs[0] hits
182 int pc_desc_hits; // number of LRU cache hits
183 int pc_desc_tests; // total number of PcDesc examinations
184 int pc_desc_searches; // total number of quasi-binary search steps
185 int pc_desc_adds; // number of LUR cache insertions
186
187 void print_pc_stats() {
188 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
189 pc_desc_queries,
190 (double)(pc_desc_tests + pc_desc_searches)
191 / pc_desc_queries);
192 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
193 pc_desc_resets,
194 pc_desc_queries, pc_desc_approx,
195 pc_desc_repeats, pc_desc_hits,
196 pc_desc_tests, pc_desc_searches, pc_desc_adds);
197 }
198 };
199
200 #ifdef COMPILER1
201 static java_nmethod_stats_struct c1_java_nmethod_stats;
202 #endif
203 #ifdef COMPILER2
204 static java_nmethod_stats_struct c2_java_nmethod_stats;
205 #endif
206 #if INCLUDE_JVMCI
207 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
208 #endif
209 static java_nmethod_stats_struct unknown_java_nmethod_stats;
210
211 static native_nmethod_stats_struct native_nmethod_stats;
212 static pc_nmethod_stats_struct pc_nmethod_stats;
213
214 static void note_java_nmethod(nmethod* nm) {
215 #ifdef COMPILER1
216 if (nm->is_compiled_by_c1()) {
217 c1_java_nmethod_stats.note_nmethod(nm);
218 } else
219 #endif
220 #ifdef COMPILER2
221 if (nm->is_compiled_by_c2()) {
222 c2_java_nmethod_stats.note_nmethod(nm);
223 } else
224 #endif
225 #if INCLUDE_JVMCI
226 if (nm->is_compiled_by_jvmci()) {
227 jvmci_java_nmethod_stats.note_nmethod(nm);
228 } else
229 #endif
230 {
231 unknown_java_nmethod_stats.note_nmethod(nm);
232 }
233 }
234 #endif // !PRODUCT
235
236 //---------------------------------------------------------------------------------
237
238
239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
240 assert(pc != NULL, "Must be non null");
241 assert(exception.not_null(), "Must be non null");
242 assert(handler != NULL, "Must be non null");
243
244 _count = 0;
245 _exception_type = exception->klass();
246 _next = NULL;
247 _purge_list_next = NULL;
248
249 add_address_and_handler(pc,handler);
250 }
251
252
253 address ExceptionCache::match(Handle exception, address pc) {
254 assert(pc != NULL,"Must be non null");
255 assert(exception.not_null(),"Must be non null");
256 if (exception->klass() == exception_type()) {
257 return (test_address(pc));
258 }
259
260 return NULL;
261 }
262
263
264 bool ExceptionCache::match_exception_with_space(Handle exception) {
265 assert(exception.not_null(),"Must be non null");
266 if (exception->klass() == exception_type() && count() < cache_size) {
267 return true;
268 }
269 return false;
270 }
271
272
273 address ExceptionCache::test_address(address addr) {
274 int limit = count();
275 for (int i = 0; i < limit; i++) {
276 if (pc_at(i) == addr) {
277 return handler_at(i);
278 }
279 }
280 return NULL;
281 }
282
283
284 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
285 if (test_address(addr) == handler) return true;
286
287 int index = count();
288 if (index < cache_size) {
289 set_pc_at(index, addr);
290 set_handler_at(index, handler);
291 increment_count();
292 return true;
293 }
294 return false;
295 }
296
297 ExceptionCache* ExceptionCache::next() {
298 return Atomic::load(&_next);
299 }
300
301 void ExceptionCache::set_next(ExceptionCache *ec) {
302 Atomic::store(ec, &_next);
303 }
304
305 //-----------------------------------------------------------------------------
306
307
308 // Helper used by both find_pc_desc methods.
309 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
310 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
311 if (!approximate)
312 return pc->pc_offset() == pc_offset;
313 else
314 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
315 }
316
317 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
318 if (initial_pc_desc == NULL) {
319 _pc_descs[0] = NULL; // native method; no PcDescs at all
320 return;
321 }
322 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
323 // reset the cache by filling it with benign (non-null) values
324 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
325 for (int i = 0; i < cache_size; i++)
326 _pc_descs[i] = initial_pc_desc;
327 }
328
329 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
330 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
331 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
332
333 // Note: one might think that caching the most recently
334 // read value separately would be a win, but one would be
335 // wrong. When many threads are updating it, the cache
336 // line it's in would bounce between caches, negating
337 // any benefit.
338
339 // In order to prevent race conditions do not load cache elements
340 // repeatedly, but use a local copy:
341 PcDesc* res;
342
343 // Step one: Check the most recently added value.
344 res = _pc_descs[0];
345 if (res == NULL) return NULL; // native method; no PcDescs at all
346 if (match_desc(res, pc_offset, approximate)) {
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
348 return res;
349 }
350
351 // Step two: Check the rest of the LRU cache.
352 for (int i = 1; i < cache_size; ++i) {
353 res = _pc_descs[i];
354 if (res->pc_offset() < 0) break; // optimization: skip empty cache
355 if (match_desc(res, pc_offset, approximate)) {
356 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
357 return res;
358 }
359 }
360
361 // Report failure.
362 return NULL;
363 }
364
365 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
366 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
367 // Update the LRU cache by shifting pc_desc forward.
368 for (int i = 0; i < cache_size; i++) {
369 PcDesc* next = _pc_descs[i];
370 _pc_descs[i] = pc_desc;
371 pc_desc = next;
372 }
373 }
374
375 // adjust pcs_size so that it is a multiple of both oopSize and
376 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
377 // of oopSize, then 2*sizeof(PcDesc) is)
378 static int adjust_pcs_size(int pcs_size) {
379 int nsize = align_up(pcs_size, oopSize);
380 if ((nsize % sizeof(PcDesc)) != 0) {
381 nsize = pcs_size + sizeof(PcDesc);
382 }
383 assert((nsize % oopSize) == 0, "correct alignment");
384 return nsize;
385 }
386
387
388 int nmethod::total_size() const {
389 return
390 consts_size() +
391 insts_size() +
392 stub_size() +
393 scopes_data_size() +
394 scopes_pcs_size() +
395 handler_table_size() +
396 nul_chk_table_size();
397 }
398
399 address* nmethod::orig_pc_addr(const frame* fr) {
400 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
401 }
402
403 const char* nmethod::compile_kind() const {
404 if (is_osr_method()) return "osr";
405 if (method() != NULL && is_native_method()) return "c2n";
406 return NULL;
407 }
408
409 // Fill in default values for various flag fields
410 void nmethod::init_defaults() {
411 _state = not_installed;
412 _has_flushed_dependencies = 0;
413 _lock_count = 0;
414 _stack_traversal_mark = 0;
415 _unload_reported = false; // jvmti state
416 _is_far_code = false; // nmethods are located in CodeCache
417
418 #ifdef ASSERT
419 _oops_are_stale = false;
420 #endif
421
422 _oops_do_mark_link = NULL;
423 _jmethod_id = NULL;
424 _osr_link = NULL;
425 _unloading_next = NULL;
426 _scavenge_root_link = NULL;
427 _scavenge_root_state = 0;
428 #if INCLUDE_RTM_OPT
429 _rtm_state = NoRTM;
430 #endif
431 #if INCLUDE_JVMCI
432 _jvmci_installed_code = NULL;
433 _speculation_log = NULL;
434 _jvmci_installed_code_triggers_invalidation = false;
435 #endif
436 }
437
438 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
439 int compile_id,
440 CodeBuffer *code_buffer,
441 int vep_offset,
442 int frame_complete,
443 int frame_size,
444 ByteSize basic_lock_owner_sp_offset,
445 ByteSize basic_lock_sp_offset,
446 OopMapSet* oop_maps) {
447 code_buffer->finalize_oop_references(method);
448 // create nmethod
449 nmethod* nm = NULL;
450 {
451 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
452 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
453 CodeOffsets offsets;
454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
456 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
457 compile_id, &offsets,
458 code_buffer, frame_size,
459 basic_lock_owner_sp_offset,
460 basic_lock_sp_offset, oop_maps);
461 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
462 }
463
464 if (nm != NULL) {
465 // verify nmethod
466 debug_only(nm->verify();) // might block
467
468 nm->log_new_nmethod();
469 nm->make_in_use();
470 }
471 return nm;
472 }
473
474 nmethod* nmethod::new_nmethod(const methodHandle& method,
475 int compile_id,
476 int entry_bci,
477 CodeOffsets* offsets,
478 int orig_pc_offset,
479 DebugInformationRecorder* debug_info,
480 Dependencies* dependencies,
481 CodeBuffer* code_buffer, int frame_size,
482 OopMapSet* oop_maps,
483 ExceptionHandlerTable* handler_table,
484 ImplicitExceptionTable* nul_chk_table,
485 AbstractCompiler* compiler,
486 int comp_level
487 #if INCLUDE_JVMCI
488 , jweak installed_code,
489 jweak speculationLog
490 #endif
491 )
492 {
493 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
494 code_buffer->finalize_oop_references(method);
495 // create nmethod
496 nmethod* nm = NULL;
497 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
498 int nmethod_size =
499 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
500 + adjust_pcs_size(debug_info->pcs_size())
501 + align_up((int)dependencies->size_in_bytes(), oopSize)
502 + align_up(handler_table->size_in_bytes() , oopSize)
503 + align_up(nul_chk_table->size_in_bytes() , oopSize)
504 + align_up(debug_info->data_size() , oopSize);
505
506 nm = new (nmethod_size, comp_level)
507 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
508 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
509 oop_maps,
510 handler_table,
511 nul_chk_table,
512 compiler,
513 comp_level
514 #if INCLUDE_JVMCI
515 , installed_code,
516 speculationLog
517 #endif
518 );
519
520 if (nm != NULL) {
521 // To make dependency checking during class loading fast, record
522 // the nmethod dependencies in the classes it is dependent on.
523 // This allows the dependency checking code to simply walk the
524 // class hierarchy above the loaded class, checking only nmethods
525 // which are dependent on those classes. The slow way is to
526 // check every nmethod for dependencies which makes it linear in
527 // the number of methods compiled. For applications with a lot
528 // classes the slow way is too slow.
529 for (Dependencies::DepStream deps(nm); deps.next(); ) {
530 if (deps.type() == Dependencies::call_site_target_value) {
531 // CallSite dependencies are managed on per-CallSite instance basis.
532 oop call_site = deps.argument_oop(0);
533 MethodHandles::add_dependent_nmethod(call_site, nm);
534 } else {
535 Klass* klass = deps.context_type();
536 if (klass == NULL) {
537 continue; // ignore things like evol_method
538 }
539 // record this nmethod as dependent on this klass
540 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
541 }
542 }
543 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
544 }
545 }
546 // Do verification and logging outside CodeCache_lock.
547 if (nm != NULL) {
548 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
549 DEBUG_ONLY(nm->verify();)
550 nm->log_new_nmethod();
551 }
552 return nm;
553 }
554
555 // For native wrappers
556 nmethod::nmethod(
557 Method* method,
558 CompilerType type,
559 int nmethod_size,
560 int compile_id,
561 CodeOffsets* offsets,
562 CodeBuffer* code_buffer,
563 int frame_size,
564 ByteSize basic_lock_owner_sp_offset,
565 ByteSize basic_lock_sp_offset,
566 OopMapSet* oop_maps )
567 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
568 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
569 _native_basic_lock_sp_offset(basic_lock_sp_offset)
570 {
571 {
572 int scopes_data_offset = 0;
573 int deoptimize_offset = 0;
574 int deoptimize_mh_offset = 0;
575
576 debug_only(NoSafepointVerifier nsv;)
577 assert_locked_or_safepoint(CodeCache_lock);
578
579 init_defaults();
580 _entry_bci = InvocationEntryBci;
581 // We have no exception handler or deopt handler make the
582 // values something that will never match a pc like the nmethod vtable entry
583 _exception_offset = 0;
584 _orig_pc_offset = 0;
585
586 _consts_offset = data_offset();
587 _stub_offset = data_offset();
588 _oops_offset = data_offset();
589 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
590 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
591 _scopes_pcs_offset = scopes_data_offset;
592 _dependencies_offset = _scopes_pcs_offset;
593 _handler_table_offset = _dependencies_offset;
594 _nul_chk_table_offset = _handler_table_offset;
595 _nmethod_end_offset = _nul_chk_table_offset;
596 _compile_id = compile_id;
597 _comp_level = CompLevel_none;
598 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
599 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
600 _osr_entry_point = NULL;
601 _exception_cache = NULL;
602 _pc_desc_container.reset_to(NULL);
603 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
604
605 _scopes_data_begin = (address) this + scopes_data_offset;
606 _deopt_handler_begin = (address) this + deoptimize_offset;
607 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
608
609 code_buffer->copy_code_and_locs_to(this);
610 code_buffer->copy_values_to(this);
611 if (ScavengeRootsInCode) {
612 Universe::heap()->register_nmethod(this);
613 }
614 debug_only(Universe::heap()->verify_nmethod(this));
615 CodeCache::commit(this);
616 }
617
618 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
619 ttyLocker ttyl; // keep the following output all in one block
620 // This output goes directly to the tty, not the compiler log.
621 // To enable tools to match it up with the compilation activity,
622 // be sure to tag this tty output with the compile ID.
623 if (xtty != NULL) {
624 xtty->begin_head("print_native_nmethod");
625 xtty->method(_method);
626 xtty->stamp();
627 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
628 }
629 // print the header part first
630 print();
631 // then print the requested information
632 if (PrintNativeNMethods) {
633 print_code();
634 if (oop_maps != NULL) {
635 oop_maps->print();
636 }
637 }
638 if (PrintRelocations) {
639 print_relocations();
640 }
641 if (xtty != NULL) {
642 xtty->tail("print_native_nmethod");
643 }
644 }
645 }
646
647 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
648 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
649 }
650
651 nmethod::nmethod(
652 Method* method,
653 CompilerType type,
654 int nmethod_size,
655 int compile_id,
656 int entry_bci,
657 CodeOffsets* offsets,
658 int orig_pc_offset,
659 DebugInformationRecorder* debug_info,
660 Dependencies* dependencies,
661 CodeBuffer *code_buffer,
662 int frame_size,
663 OopMapSet* oop_maps,
664 ExceptionHandlerTable* handler_table,
665 ImplicitExceptionTable* nul_chk_table,
666 AbstractCompiler* compiler,
667 int comp_level
668 #if INCLUDE_JVMCI
669 , jweak installed_code,
670 jweak speculation_log
671 #endif
672 )
673 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
674 _native_receiver_sp_offset(in_ByteSize(-1)),
675 _native_basic_lock_sp_offset(in_ByteSize(-1))
676 {
677 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
678 {
679 debug_only(NoSafepointVerifier nsv;)
680 assert_locked_or_safepoint(CodeCache_lock);
681
682 _deopt_handler_begin = (address) this;
683 _deopt_mh_handler_begin = (address) this;
684
685 init_defaults();
686 _entry_bci = entry_bci;
687 _compile_id = compile_id;
688 _comp_level = comp_level;
689 _orig_pc_offset = orig_pc_offset;
690 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
691
692 // Section offsets
693 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
694 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
695 set_ctable_begin(header_begin() + _consts_offset);
696
697 #if INCLUDE_JVMCI
698 _jvmci_installed_code = installed_code;
699 _speculation_log = speculation_log;
700 oop obj = JNIHandles::resolve(installed_code);
701 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
702 _jvmci_installed_code_triggers_invalidation = false;
703 } else {
704 _jvmci_installed_code_triggers_invalidation = true;
705 }
706
707 if (compiler->is_jvmci()) {
708 // JVMCI might not produce any stub sections
709 if (offsets->value(CodeOffsets::Exceptions) != -1) {
710 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
711 } else {
712 _exception_offset = -1;
713 }
714 if (offsets->value(CodeOffsets::Deopt) != -1) {
715 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
716 } else {
717 _deopt_handler_begin = NULL;
718 }
719 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
720 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
721 } else {
722 _deopt_mh_handler_begin = NULL;
723 }
724 } else {
725 #endif
726 // Exception handler and deopt handler are in the stub section
727 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
728 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
729
730 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
731 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
732 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
733 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
734 } else {
735 _deopt_mh_handler_begin = NULL;
736 #if INCLUDE_JVMCI
737 }
738 #endif
739 }
740 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
741 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
742 } else {
743 _unwind_handler_offset = -1;
744 }
745
746 _oops_offset = data_offset();
747 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
748 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
749
750 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
751 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
752 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
753 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
754 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
755 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
756 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
757 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
758 _exception_cache = NULL;
759
760 _scopes_data_begin = (address) this + scopes_data_offset;
761
762 _pc_desc_container.reset_to(scopes_pcs_begin());
763
764 code_buffer->copy_code_and_locs_to(this);
765 // Copy contents of ScopeDescRecorder to nmethod
766 code_buffer->copy_values_to(this);
767 debug_info->copy_to(this);
768 dependencies->copy_to(this);
769 if (ScavengeRootsInCode) {
770 Universe::heap()->register_nmethod(this);
771 }
772 debug_only(Universe::heap()->verify_nmethod(this));
773
774 CodeCache::commit(this);
775
776 // Copy contents of ExceptionHandlerTable to nmethod
777 handler_table->copy_to(this);
778 nul_chk_table->copy_to(this);
779
780 // we use the information of entry points to find out if a method is
781 // static or non static
782 assert(compiler->is_c2() || compiler->is_jvmci() ||
783 _method->is_static() == (entry_point() == _verified_entry_point),
784 " entry points must be same for static methods and vice versa");
785 }
786 }
787
788 // Print a short set of xml attributes to identify this nmethod. The
789 // output should be embedded in some other element.
790 void nmethod::log_identity(xmlStream* log) const {
791 log->print(" compile_id='%d'", compile_id());
792 const char* nm_kind = compile_kind();
793 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
794 log->print(" compiler='%s'", compiler_name());
795 if (TieredCompilation) {
796 log->print(" level='%d'", comp_level());
797 }
798 #if INCLUDE_JVMCI
799 char buffer[O_BUFLEN];
800 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN);
801 if (jvmci_name != NULL) {
802 log->print(" jvmci_installed_code_name='");
803 log->text("%s", jvmci_name);
804 log->print("'");
805 }
806 #endif
807 }
808
809
810 #define LOG_OFFSET(log, name) \
811 if (p2i(name##_end()) - p2i(name##_begin())) \
812 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
813 p2i(name##_begin()) - p2i(this))
814
815
816 void nmethod::log_new_nmethod() const {
817 if (LogCompilation && xtty != NULL) {
818 ttyLocker ttyl;
819 HandleMark hm;
820 xtty->begin_elem("nmethod");
821 log_identity(xtty);
822 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
823 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
824
825 LOG_OFFSET(xtty, relocation);
826 LOG_OFFSET(xtty, consts);
827 LOG_OFFSET(xtty, insts);
828 LOG_OFFSET(xtty, stub);
829 LOG_OFFSET(xtty, scopes_data);
830 LOG_OFFSET(xtty, scopes_pcs);
831 LOG_OFFSET(xtty, dependencies);
832 LOG_OFFSET(xtty, handler_table);
833 LOG_OFFSET(xtty, nul_chk_table);
834 LOG_OFFSET(xtty, oops);
835 LOG_OFFSET(xtty, metadata);
836
837 xtty->method(method());
838 xtty->stamp();
839 xtty->end_elem();
840 }
841 }
842
843 #undef LOG_OFFSET
844
845
846 // Print out more verbose output usually for a newly created nmethod.
847 void nmethod::print_on(outputStream* st, const char* msg) const {
848 if (st != NULL) {
849 ttyLocker ttyl;
850 if (WizardMode) {
851 CompileTask::print(st, this, msg, /*short_form:*/ true);
852 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
853 } else {
854 CompileTask::print(st, this, msg, /*short_form:*/ false);
855 }
856 }
857 }
858
859 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
860 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
861 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
862 print_nmethod(printnmethods);
863 }
864 }
865
866 void nmethod::print_nmethod(bool printmethod) {
867 ttyLocker ttyl; // keep the following output all in one block
868 if (xtty != NULL) {
869 xtty->begin_head("print_nmethod");
870 xtty->stamp();
871 xtty->end_head();
872 }
873 // print the header part first
874 print();
875 // then print the requested information
876 if (printmethod) {
877 print_code();
878 print_pcs();
879 if (oop_maps()) {
880 oop_maps()->print();
881 }
882 }
883 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
884 print_scopes();
885 }
886 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
887 print_relocations();
888 }
889 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
890 print_dependencies();
891 }
892 if (printmethod || PrintExceptionHandlers) {
893 print_handler_table();
894 print_nul_chk_table();
895 }
896 if (printmethod) {
897 print_recorded_oops();
898 print_recorded_metadata();
899 }
900 if (xtty != NULL) {
901 xtty->tail("print_nmethod");
902 }
903 }
904
905
906 // Promote one word from an assembly-time handle to a live embedded oop.
907 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
908 if (handle == NULL ||
909 // As a special case, IC oops are initialized to 1 or -1.
910 handle == (jobject) Universe::non_oop_word()) {
911 (*dest) = (oop) handle;
912 } else {
913 (*dest) = JNIHandles::resolve_non_null(handle);
914 }
915 }
916
917
918 // Have to have the same name because it's called by a template
919 void nmethod::copy_values(GrowableArray<jobject>* array) {
920 int length = array->length();
921 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
922 oop* dest = oops_begin();
923 for (int index = 0 ; index < length; index++) {
924 initialize_immediate_oop(&dest[index], array->at(index));
925 }
926
927 // Now we can fix up all the oops in the code. We need to do this
928 // in the code because the assembler uses jobjects as placeholders.
929 // The code and relocations have already been initialized by the
930 // CodeBlob constructor, so it is valid even at this early point to
931 // iterate over relocations and patch the code.
932 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
933 }
934
935 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
936 int length = array->length();
937 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
938 Metadata** dest = metadata_begin();
939 for (int index = 0 ; index < length; index++) {
940 dest[index] = array->at(index);
941 }
942 }
943
944 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
945 // re-patch all oop-bearing instructions, just in case some oops moved
946 RelocIterator iter(this, begin, end);
947 while (iter.next()) {
948 if (iter.type() == relocInfo::oop_type) {
949 oop_Relocation* reloc = iter.oop_reloc();
950 if (initialize_immediates && reloc->oop_is_immediate()) {
951 oop* dest = reloc->oop_addr();
952 initialize_immediate_oop(dest, (jobject) *dest);
953 }
954 // Refresh the oop-related bits of this instruction.
955 reloc->fix_oop_relocation();
956 } else if (iter.type() == relocInfo::metadata_type) {
957 metadata_Relocation* reloc = iter.metadata_reloc();
958 reloc->fix_metadata_relocation();
959 }
960 }
961 }
962
963
964 void nmethod::verify_clean_inline_caches() {
965 assert_locked_or_safepoint(CompiledIC_lock);
966
967 ResourceMark rm;
968 RelocIterator iter(this, oops_reloc_begin());
969 while(iter.next()) {
970 switch(iter.type()) {
971 case relocInfo::virtual_call_type:
972 case relocInfo::opt_virtual_call_type: {
973 CompiledIC *ic = CompiledIC_at(&iter);
974 // Ok, to lookup references to zombies here
975 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
976 assert(cb != NULL, "destination not in CodeBlob?");
977 nmethod* nm = cb->as_nmethod_or_null();
978 if( nm != NULL ) {
979 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
980 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
981 assert(ic->is_clean(), "IC should be clean");
982 }
983 }
984 break;
985 }
986 case relocInfo::static_call_type: {
987 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
988 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
989 assert(cb != NULL, "destination not in CodeBlob?");
990 nmethod* nm = cb->as_nmethod_or_null();
991 if( nm != NULL ) {
992 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
993 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
994 assert(csc->is_clean(), "IC should be clean");
995 }
996 }
997 break;
998 }
999 default:
1000 break;
1001 }
1002 }
1003 }
1004
1005 // This is a private interface with the sweeper.
1006 void nmethod::mark_as_seen_on_stack() {
1007 assert(is_alive(), "Must be an alive method");
1008 // Set the traversal mark to ensure that the sweeper does 2
1009 // cleaning passes before moving to zombie.
1010 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1011 }
1012
1013 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1014 // there are no activations on the stack, not in use by the VM,
1015 // and not in use by the ServiceThread)
1016 bool nmethod::can_convert_to_zombie() {
1017 assert(is_not_entrant(), "must be a non-entrant method");
1018
1019 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1020 // count can be greater than the stack traversal count before it hits the
1021 // nmethod for the second time.
1022 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1023 !is_locked_by_vm();
1024 }
1025
1026 void nmethod::inc_decompile_count() {
1027 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1028 // Could be gated by ProfileTraps, but do not bother...
1029 Method* m = method();
1030 if (m == NULL) return;
1031 MethodData* mdo = m->method_data();
1032 if (mdo == NULL) return;
1033 // There is a benign race here. See comments in methodData.hpp.
1034 mdo->inc_decompile_count();
1035 }
1036
1037 void nmethod::make_unloaded(oop cause) {
1038
1039 post_compiled_method_unload();
1040
1041 // This nmethod is being unloaded, make sure that dependencies
1042 // recorded in instanceKlasses get flushed.
1043 // Since this work is being done during a GC, defer deleting dependencies from the
1044 // InstanceKlass.
1045 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1046 flush_dependencies(/*delete_immediately*/false);
1047
1048 // Break cycle between nmethod & method
1049 LogTarget(Trace, class, unload, nmethod) lt;
1050 if (lt.is_enabled()) {
1051 LogStream ls(lt);
1052 ls.print("making nmethod " INTPTR_FORMAT
1053 " unloadable, Method*(" INTPTR_FORMAT
1054 "), cause(" INTPTR_FORMAT ") ",
1055 p2i(this), p2i(_method), p2i(cause));
1056 if (cause != NULL) {
1057 cause->print_value_on(&ls);
1058 }
1059 ls.cr();
1060 }
1061 // Unlink the osr method, so we do not look this up again
1062 if (is_osr_method()) {
1063 // Invalidate the osr nmethod only once
1064 if (is_in_use()) {
1065 invalidate_osr_method();
1066 }
1067 #ifdef ASSERT
1068 if (method() != NULL) {
1069 // Make sure osr nmethod is invalidated, i.e. not on the list
1070 bool found = method()->method_holder()->remove_osr_nmethod(this);
1071 assert(!found, "osr nmethod should have been invalidated");
1072 }
1073 #endif
1074 }
1075
1076 // If _method is already NULL the Method* is about to be unloaded,
1077 // so we don't have to break the cycle. Note that it is possible to
1078 // have the Method* live here, in case we unload the nmethod because
1079 // it is pointing to some oop (other than the Method*) being unloaded.
1080 if (_method != NULL) {
1081 // OSR methods point to the Method*, but the Method* does not
1082 // point back!
1083 if (_method->code() == this) {
1084 _method->clear_code(); // Break a cycle
1085 }
1086 _method = NULL; // Clear the method of this dead nmethod
1087 }
1088
1089 // Make the class unloaded - i.e., change state and notify sweeper
1090 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1091 if (is_in_use()) {
1092 // Transitioning directly from live to unloaded -- so
1093 // we need to force a cache clean-up; remember this
1094 // for later on.
1095 CodeCache::set_needs_cache_clean(true);
1096 }
1097
1098 // Unregister must be done before the state change
1099 Universe::heap()->unregister_nmethod(this);
1100
1101 _state = unloaded;
1102
1103 // Log the unloading.
1104 log_state_change(cause);
1105
1106 #if INCLUDE_JVMCI
1107 // The method can only be unloaded after the pointer to the installed code
1108 // Java wrapper is no longer alive. Here we need to clear out this weak
1109 // reference to the dead object.
1110 maybe_invalidate_installed_code();
1111 #endif
1112
1113 // The Method* is gone at this point
1114 assert(_method == NULL, "Tautology");
1115
1116 set_osr_link(NULL);
1117 NMethodSweeper::report_state_change(this);
1118 }
1119
1120 void nmethod::invalidate_osr_method() {
1121 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1122 // Remove from list of active nmethods
1123 if (method() != NULL) {
1124 method()->method_holder()->remove_osr_nmethod(this);
1125 }
1126 }
1127
1128 void nmethod::log_state_change(oop cause) const {
1129 if (LogCompilation) {
1130 if (xtty != NULL) {
1131 ttyLocker ttyl; // keep the following output all in one block
1132 if (_state == unloaded) {
1133 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1134 os::current_thread_id());
1135 } else {
1136 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1137 os::current_thread_id(),
1138 (_state == zombie ? " zombie='1'" : ""));
1139 }
1140 log_identity(xtty);
1141 if (cause != NULL) {
1142 xtty->print(" cause='%s'", cause->klass()->external_name());
1143 }
1144 xtty->stamp();
1145 xtty->end_elem();
1146 }
1147 }
1148
1149 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1150 CompileTask::print_ul(this, state_msg);
1151 if (PrintCompilation && _state != unloaded) {
1152 print_on(tty, state_msg);
1153 }
1154 }
1155
1156 /**
1157 * Common functionality for both make_not_entrant and make_zombie
1158 */
1159 bool nmethod::make_not_entrant_or_zombie(int state) {
1160 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1161 assert(!is_zombie(), "should not already be a zombie");
1162
1163 if (_state == state) {
1164 // Avoid taking the lock if already in required state.
1165 // This is safe from races because the state is an end-state,
1166 // which the nmethod cannot back out of once entered.
1167 // No need for fencing either.
1168 return false;
1169 }
1170
1171 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1172 nmethodLocker nml(this);
1173 methodHandle the_method(method());
1174 // This can be called while the system is already at a safepoint which is ok
1175 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1176
1177 // during patching, depending on the nmethod state we must notify the GC that
1178 // code has been unloaded, unregistering it. We cannot do this right while
1179 // holding the Patching_lock because we need to use the CodeCache_lock. This
1180 // would be prone to deadlocks.
1181 // This flag is used to remember whether we need to later lock and unregister.
1182 bool nmethod_needs_unregister = false;
1183
1184 {
1185 // invalidate osr nmethod before acquiring the patching lock since
1186 // they both acquire leaf locks and we don't want a deadlock.
1187 // This logic is equivalent to the logic below for patching the
1188 // verified entry point of regular methods. We check that the
1189 // nmethod is in use to ensure that it is invalidated only once.
1190 if (is_osr_method() && is_in_use()) {
1191 // this effectively makes the osr nmethod not entrant
1192 invalidate_osr_method();
1193 }
1194
1195 // Enter critical section. Does not block for safepoint.
1196 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1197
1198 if (_state == state) {
1199 // another thread already performed this transition so nothing
1200 // to do, but return false to indicate this.
1201 return false;
1202 }
1203
1204 // The caller can be calling the method statically or through an inline
1205 // cache call.
1206 if (!is_osr_method() && !is_not_entrant()) {
1207 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1208 SharedRuntime::get_handle_wrong_method_stub());
1209 }
1210
1211 if (is_in_use() && update_recompile_counts()) {
1212 // It's a true state change, so mark the method as decompiled.
1213 // Do it only for transition from alive.
1214 inc_decompile_count();
1215 }
1216
1217 // If the state is becoming a zombie, signal to unregister the nmethod with
1218 // the heap.
1219 // This nmethod may have already been unloaded during a full GC.
1220 if ((state == zombie) && !is_unloaded()) {
1221 nmethod_needs_unregister = true;
1222 }
1223
1224 // Must happen before state change. Otherwise we have a race condition in
1225 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1226 // transition its state from 'not_entrant' to 'zombie' without having to wait
1227 // for stack scanning.
1228 if (state == not_entrant) {
1229 mark_as_seen_on_stack();
1230 OrderAccess::storestore(); // _stack_traversal_mark and _state
1231 }
1232
1233 // Change state
1234 _state = state;
1235
1236 // Log the transition once
1237 log_state_change();
1238
1239 // Invalidate while holding the patching lock
1240 JVMCI_ONLY(maybe_invalidate_installed_code());
1241
1242 // Remove nmethod from method.
1243 // We need to check if both the _code and _from_compiled_code_entry_point
1244 // refer to this nmethod because there is a race in setting these two fields
1245 // in Method* as seen in bugid 4947125.
1246 // If the vep() points to the zombie nmethod, the memory for the nmethod
1247 // could be flushed and the compiler and vtable stubs could still call
1248 // through it.
1249 if (method() != NULL && (method()->code() == this ||
1250 method()->from_compiled_entry() == verified_entry_point())) {
1251 HandleMark hm;
1252 method()->clear_code(false /* already owns Patching_lock */);
1253 }
1254 } // leave critical region under Patching_lock
1255
1256 #ifdef ASSERT
1257 if (is_osr_method() && method() != NULL) {
1258 // Make sure osr nmethod is invalidated, i.e. not on the list
1259 bool found = method()->method_holder()->remove_osr_nmethod(this);
1260 assert(!found, "osr nmethod should have been invalidated");
1261 }
1262 #endif
1263
1264 // When the nmethod becomes zombie it is no longer alive so the
1265 // dependencies must be flushed. nmethods in the not_entrant
1266 // state will be flushed later when the transition to zombie
1267 // happens or they get unloaded.
1268 if (state == zombie) {
1269 {
1270 // Flushing dependencies must be done before any possible
1271 // safepoint can sneak in, otherwise the oops used by the
1272 // dependency logic could have become stale.
1273 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1274 if (nmethod_needs_unregister) {
1275 Universe::heap()->unregister_nmethod(this);
1276 }
1277 flush_dependencies(/*delete_immediately*/true);
1278 }
1279
1280 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1281 // event and it hasn't already been reported for this nmethod then
1282 // report it now. The event may have been reported earlier if the GC
1283 // marked it for unloading). JvmtiDeferredEventQueue support means
1284 // we no longer go to a safepoint here.
1285 post_compiled_method_unload();
1286
1287 #ifdef ASSERT
1288 // It's no longer safe to access the oops section since zombie
1289 // nmethods aren't scanned for GC.
1290 _oops_are_stale = true;
1291 #endif
1292 // the Method may be reclaimed by class unloading now that the
1293 // nmethod is in zombie state
1294 set_method(NULL);
1295 } else {
1296 assert(state == not_entrant, "other cases may need to be handled differently");
1297 }
1298
1299 if (TraceCreateZombies) {
1300 ResourceMark m;
1301 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");
1302 }
1303
1304 NMethodSweeper::report_state_change(this);
1305 return true;
1306 }
1307
1308 void nmethod::flush() {
1309 // Note that there are no valid oops in the nmethod anymore.
1310 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1311 "osr nmethod must be unloaded or zombie before flushing");
1312 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1313 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1314 assert_locked_or_safepoint(CodeCache_lock);
1315
1316 // completely deallocate this method
1317 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1318 if (PrintMethodFlushing) {
1319 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1320 "/Free CodeCache:" SIZE_FORMAT "Kb",
1321 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1322 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1323 }
1324
1325 // We need to deallocate any ExceptionCache data.
1326 // Note that we do not need to grab the nmethod lock for this, it
1327 // better be thread safe if we're disposing of it!
1328 ExceptionCache* ec = exception_cache();
1329 set_exception_cache(NULL);
1330 while(ec != NULL) {
1331 ExceptionCache* next = ec->next();
1332 delete ec;
1333 ec = next;
1334 }
1335
1336 if (on_scavenge_root_list()) {
1337 CodeCache::drop_scavenge_root_nmethod(this);
1338 }
1339
1340 #if INCLUDE_JVMCI
1341 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1342 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1343 #endif
1344
1345 CodeBlob::flush();
1346 CodeCache::free(this);
1347 }
1348
1349 //
1350 // Notify all classes this nmethod is dependent on that it is no
1351 // longer dependent. This should only be called in two situations.
1352 // First, when a nmethod transitions to a zombie all dependents need
1353 // to be clear. Since zombification happens at a safepoint there's no
1354 // synchronization issues. The second place is a little more tricky.
1355 // During phase 1 of mark sweep class unloading may happen and as a
1356 // result some nmethods may get unloaded. In this case the flushing
1357 // of dependencies must happen during phase 1 since after GC any
1358 // dependencies in the unloaded nmethod won't be updated, so
1359 // traversing the dependency information in unsafe. In that case this
1360 // function is called with a boolean argument and this function only
1361 // notifies instanceKlasses that are reachable
1362
1363 void nmethod::flush_dependencies(bool delete_immediately) {
1364 assert_locked_or_safepoint(CodeCache_lock);
1365 assert(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 // If this oop is not live, the nmethod can be unloaded.
1394 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root) {
1395 assert(root != NULL, "just checking");
1396 oop obj = *root;
1397 if (obj == NULL || is_alive->do_object_b(obj)) {
1398 return false;
1399 }
1400
1401 // An nmethod might be unloaded simply because one of its constant oops has gone dead.
1402 // No actual classes need to be unloaded in order for this to occur.
1403 make_unloaded(obj);
1404 return true;
1405 }
1406
1407 // ------------------------------------------------------------------
1408 // post_compiled_method_load_event
1409 // new method for install_code() path
1410 // Transfer information from compilation to jvmti
1411 void nmethod::post_compiled_method_load_event() {
1412
1413 Method* moop = method();
1414 HOTSPOT_COMPILED_METHOD_LOAD(
1415 (char *) moop->klass_name()->bytes(),
1416 moop->klass_name()->utf8_length(),
1417 (char *) moop->name()->bytes(),
1418 moop->name()->utf8_length(),
1419 (char *) moop->signature()->bytes(),
1420 moop->signature()->utf8_length(),
1421 insts_begin(), insts_size());
1422
1423 if (JvmtiExport::should_post_compiled_method_load() ||
1424 JvmtiExport::should_post_compiled_method_unload()) {
1425 get_and_cache_jmethod_id();
1426 }
1427
1428 if (JvmtiExport::should_post_compiled_method_load()) {
1429 // Let the Service thread (which is a real Java thread) post the event
1430 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1431 JvmtiDeferredEventQueue::enqueue(
1432 JvmtiDeferredEvent::compiled_method_load_event(this));
1433 }
1434 }
1435
1436 jmethodID nmethod::get_and_cache_jmethod_id() {
1437 if (_jmethod_id == NULL) {
1438 // Cache the jmethod_id since it can no longer be looked up once the
1439 // method itself has been marked for unloading.
1440 _jmethod_id = method()->jmethod_id();
1441 }
1442 return _jmethod_id;
1443 }
1444
1445 void nmethod::post_compiled_method_unload() {
1446 if (unload_reported()) {
1447 // During unloading we transition to unloaded and then to zombie
1448 // and the unloading is reported during the first transition.
1449 return;
1450 }
1451
1452 assert(_method != NULL && !is_unloaded(), "just checking");
1453 DTRACE_METHOD_UNLOAD_PROBE(method());
1454
1455 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1456 // post the event. Sometime later this nmethod will be made a zombie
1457 // by the sweeper but the Method* will not be valid at that point.
1458 // If the _jmethod_id is null then no load event was ever requested
1459 // so don't bother posting the unload. The main reason for this is
1460 // that the jmethodID is a weak reference to the Method* so if
1461 // it's being unloaded there's no way to look it up since the weak
1462 // ref will have been cleared.
1463 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1464 assert(!unload_reported(), "already unloaded");
1465 JvmtiDeferredEvent event =
1466 JvmtiDeferredEvent::compiled_method_unload_event(this,
1467 _jmethod_id, insts_begin());
1468 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1469 JvmtiDeferredEventQueue::enqueue(event);
1470 }
1471
1472 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1473 // any time. As the nmethod is being unloaded now we mark it has
1474 // having the unload event reported - this will ensure that we don't
1475 // attempt to report the event in the unlikely scenario where the
1476 // event is enabled at the time the nmethod is made a zombie.
1477 set_unload_reported();
1478 }
1479
1480 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive) {
1481 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1482
1483 oop_Relocation* r = iter_at_oop->oop_reloc();
1484 // Traverse those oops directly embedded in the code.
1485 // Other oops (oop_index>0) are seen as part of scopes_oops.
1486 assert(1 == (r->oop_is_immediate()) +
1487 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1488 "oop must be found in exactly one place");
1489 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1490 // Unload this nmethod if the oop is dead.
1491 if (can_unload(is_alive, r->oop_addr())) {
1492 return true;;
1493 }
1494 }
1495
1496 return false;
1497 }
1498
1499 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive) {
1500 // Scopes
1501 for (oop* p = oops_begin(); p < oops_end(); p++) {
1502 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1503 if (can_unload(is_alive, p)) {
1504 return true;
1505 }
1506 }
1507 return false;
1508 }
1509
1510 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive) {
1511 // Compiled code
1512
1513 // Prevent extra code cache walk for platforms that don't have immediate oops.
1514 if (relocInfo::mustIterateImmediateOopsInCode()) {
1515 RelocIterator iter(this, low_boundary);
1516 while (iter.next()) {
1517 if (iter.type() == relocInfo::oop_type) {
1518 if (unload_if_dead_at(&iter, is_alive)) {
1519 return true;
1520 }
1521 }
1522 }
1523 }
1524
1525 return do_unloading_scopes(is_alive);
1526 }
1527
1528 #if INCLUDE_JVMCI
1529 bool nmethod::do_unloading_jvmci() {
1530 if (_jvmci_installed_code != NULL) {
1531 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1532 if (_jvmci_installed_code_triggers_invalidation) {
1533 // The reference to the installed code has been dropped so invalidate
1534 // this nmethod and allow the sweeper to reclaim it.
1535 make_not_entrant();
1536 }
1537 clear_jvmci_installed_code();
1538 }
1539 }
1540 return false;
1541 }
1542 #endif
1543
1544 // Iterate over metadata calling this function. Used by RedefineClasses
1545 void nmethod::metadata_do(void f(Metadata*)) {
1546 {
1547 // Visit all immediate references that are embedded in the instruction stream.
1548 RelocIterator iter(this, oops_reloc_begin());
1549 while (iter.next()) {
1550 if (iter.type() == relocInfo::metadata_type ) {
1551 metadata_Relocation* r = iter.metadata_reloc();
1552 // In this metadata, we must only follow those metadatas directly embedded in
1553 // the code. Other metadatas (oop_index>0) are seen as part of
1554 // the metadata section below.
1555 assert(1 == (r->metadata_is_immediate()) +
1556 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1557 "metadata must be found in exactly one place");
1558 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1559 Metadata* md = r->metadata_value();
1560 if (md != _method) f(md);
1561 }
1562 } else if (iter.type() == relocInfo::virtual_call_type) {
1563 // Check compiledIC holders associated with this nmethod
1564 ResourceMark rm;
1565 CompiledIC *ic = CompiledIC_at(&iter);
1566 if (ic->is_icholder_call()) {
1567 CompiledICHolder* cichk = ic->cached_icholder();
1568 f(cichk->holder_metadata());
1569 f(cichk->holder_klass());
1570 } else {
1571 Metadata* ic_oop = ic->cached_metadata();
1572 if (ic_oop != NULL) {
1573 f(ic_oop);
1574 }
1575 }
1576 }
1577 }
1578 }
1579
1580 // Visit the metadata section
1581 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1582 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1583 Metadata* md = *p;
1584 f(md);
1585 }
1586
1587 // Visit metadata not embedded in the other places.
1588 if (_method != NULL) f(_method);
1589 }
1590
1591 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1592 // make sure the oops ready to receive visitors
1593 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1594 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1595
1596 // Prevent extra code cache walk for platforms that don't have immediate oops.
1597 if (relocInfo::mustIterateImmediateOopsInCode()) {
1598 RelocIterator iter(this, oops_reloc_begin());
1599
1600 while (iter.next()) {
1601 if (iter.type() == relocInfo::oop_type ) {
1602 oop_Relocation* r = iter.oop_reloc();
1603 // In this loop, we must only follow those oops directly embedded in
1604 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1605 assert(1 == (r->oop_is_immediate()) +
1606 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1607 "oop must be found in exactly one place");
1608 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1609 f->do_oop(r->oop_addr());
1610 }
1611 }
1612 }
1613 }
1614
1615 // Scopes
1616 // This includes oop constants not inlined in the code stream.
1617 for (oop* p = oops_begin(); p < oops_end(); p++) {
1618 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1619 f->do_oop(p);
1620 }
1621 }
1622
1623 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1624
1625 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1626
1627 // An nmethod is "marked" if its _mark_link is set non-null.
1628 // Even if it is the end of the linked list, it will have a non-null link value,
1629 // as long as it is on the list.
1630 // This code must be MP safe, because it is used from parallel GC passes.
1631 bool nmethod::test_set_oops_do_mark() {
1632 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1633 if (_oops_do_mark_link == NULL) {
1634 // Claim this nmethod for this thread to mark.
1635 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1636 // Atomically append this nmethod (now claimed) to the head of the list:
1637 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1638 for (;;) {
1639 nmethod* required_mark_nmethods = observed_mark_nmethods;
1640 _oops_do_mark_link = required_mark_nmethods;
1641 observed_mark_nmethods =
1642 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1643 if (observed_mark_nmethods == required_mark_nmethods)
1644 break;
1645 }
1646 // Mark was clear when we first saw this guy.
1647 LogTarget(Trace, gc, nmethod) lt;
1648 if (lt.is_enabled()) {
1649 LogStream ls(lt);
1650 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1651 }
1652 return false;
1653 }
1654 }
1655 // On fall through, another racing thread marked this nmethod before we did.
1656 return true;
1657 }
1658
1659 void nmethod::oops_do_marking_prologue() {
1660 log_trace(gc, nmethod)("oops_do_marking_prologue");
1661 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1662 // We use cmpxchg instead of regular assignment here because the user
1663 // may fork a bunch of threads, and we need them all to see the same state.
1664 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1665 guarantee(observed == NULL, "no races in this sequential code");
1666 }
1667
1668 void nmethod::oops_do_marking_epilogue() {
1669 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1670 nmethod* cur = _oops_do_mark_nmethods;
1671 while (cur != NMETHOD_SENTINEL) {
1672 assert(cur != NULL, "not NULL-terminated");
1673 nmethod* next = cur->_oops_do_mark_link;
1674 cur->_oops_do_mark_link = NULL;
1675 DEBUG_ONLY(cur->verify_oop_relocations());
1676
1677 LogTarget(Trace, gc, nmethod) lt;
1678 if (lt.is_enabled()) {
1679 LogStream ls(lt);
1680 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1681 }
1682 cur = next;
1683 }
1684 nmethod* required = _oops_do_mark_nmethods;
1685 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1686 guarantee(observed == required, "no races in this sequential code");
1687 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1688 }
1689
1690 class DetectScavengeRoot: public OopClosure {
1691 bool _detected_scavenge_root;
1692 nmethod* _print_nm;
1693 public:
1694 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1695
1696 bool detected_scavenge_root() { return _detected_scavenge_root; }
1697 virtual void do_oop(oop* p) {
1698 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1699 NOT_PRODUCT(maybe_print(p));
1700 _detected_scavenge_root = true;
1701 }
1702 }
1703 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1704
1705 #ifndef PRODUCT
1706 void maybe_print(oop* p) {
1707 LogTarget(Trace, gc, nmethod) lt;
1708 if (lt.is_enabled()) {
1709 LogStream ls(lt);
1710 if (!_detected_scavenge_root) {
1711 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1712 }
1713 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1714 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1715 p2i(*p), p2i(p));
1716 ls.cr();
1717 }
1718 }
1719 #endif //PRODUCT
1720 };
1721
1722 bool nmethod::detect_scavenge_root_oops() {
1723 DetectScavengeRoot detect_scavenge_root(this);
1724 oops_do(&detect_scavenge_root);
1725 return detect_scavenge_root.detected_scavenge_root();
1726 }
1727
1728 inline bool includes(void* p, void* from, void* to) {
1729 return from <= p && p < to;
1730 }
1731
1732
1733 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1734 assert(count >= 2, "must be sentinel values, at least");
1735
1736 #ifdef ASSERT
1737 // must be sorted and unique; we do a binary search in find_pc_desc()
1738 int prev_offset = pcs[0].pc_offset();
1739 assert(prev_offset == PcDesc::lower_offset_limit,
1740 "must start with a sentinel");
1741 for (int i = 1; i < count; i++) {
1742 int this_offset = pcs[i].pc_offset();
1743 assert(this_offset > prev_offset, "offsets must be sorted");
1744 prev_offset = this_offset;
1745 }
1746 assert(prev_offset == PcDesc::upper_offset_limit,
1747 "must end with a sentinel");
1748 #endif //ASSERT
1749
1750 // Search for MethodHandle invokes and tag the nmethod.
1751 for (int i = 0; i < count; i++) {
1752 if (pcs[i].is_method_handle_invoke()) {
1753 set_has_method_handle_invokes(true);
1754 break;
1755 }
1756 }
1757 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1758
1759 int size = count * sizeof(PcDesc);
1760 assert(scopes_pcs_size() >= size, "oob");
1761 memcpy(scopes_pcs_begin(), pcs, size);
1762
1763 // Adjust the final sentinel downward.
1764 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1765 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1766 last_pc->set_pc_offset(content_size() + 1);
1767 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1768 // Fill any rounding gaps with copies of the last record.
1769 last_pc[1] = last_pc[0];
1770 }
1771 // The following assert could fail if sizeof(PcDesc) is not
1772 // an integral multiple of oopSize (the rounding term).
1773 // If it fails, change the logic to always allocate a multiple
1774 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1775 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1776 }
1777
1778 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1779 assert(scopes_data_size() >= size, "oob");
1780 memcpy(scopes_data_begin(), buffer, size);
1781 }
1782
1783 #ifdef ASSERT
1784 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1785 PcDesc* lower = search.scopes_pcs_begin();
1786 PcDesc* upper = search.scopes_pcs_end();
1787 lower += 1; // exclude initial sentinel
1788 PcDesc* res = NULL;
1789 for (PcDesc* p = lower; p < upper; p++) {
1790 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1791 if (match_desc(p, pc_offset, approximate)) {
1792 if (res == NULL)
1793 res = p;
1794 else
1795 res = (PcDesc*) badAddress;
1796 }
1797 }
1798 return res;
1799 }
1800 #endif
1801
1802
1803 // Finds a PcDesc with real-pc equal to "pc"
1804 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1805 address base_address = search.code_begin();
1806 if ((pc < base_address) ||
1807 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1808 return NULL; // PC is wildly out of range
1809 }
1810 int pc_offset = (int) (pc - base_address);
1811
1812 // Check the PcDesc cache if it contains the desired PcDesc
1813 // (This as an almost 100% hit rate.)
1814 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1815 if (res != NULL) {
1816 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1817 return res;
1818 }
1819
1820 // Fallback algorithm: quasi-linear search for the PcDesc
1821 // Find the last pc_offset less than the given offset.
1822 // The successor must be the required match, if there is a match at all.
1823 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1824 PcDesc* lower = search.scopes_pcs_begin();
1825 PcDesc* upper = search.scopes_pcs_end();
1826 upper -= 1; // exclude final sentinel
1827 if (lower >= upper) return NULL; // native method; no PcDescs at all
1828
1829 #define assert_LU_OK \
1830 /* invariant on lower..upper during the following search: */ \
1831 assert(lower->pc_offset() < pc_offset, "sanity"); \
1832 assert(upper->pc_offset() >= pc_offset, "sanity")
1833 assert_LU_OK;
1834
1835 // Use the last successful return as a split point.
1836 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1837 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1838 if (mid->pc_offset() < pc_offset) {
1839 lower = mid;
1840 } else {
1841 upper = mid;
1842 }
1843
1844 // Take giant steps at first (4096, then 256, then 16, then 1)
1845 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1846 const int RADIX = (1 << LOG2_RADIX);
1847 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1848 while ((mid = lower + step) < upper) {
1849 assert_LU_OK;
1850 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1851 if (mid->pc_offset() < pc_offset) {
1852 lower = mid;
1853 } else {
1854 upper = mid;
1855 break;
1856 }
1857 }
1858 assert_LU_OK;
1859 }
1860
1861 // Sneak up on the value with a linear search of length ~16.
1862 while (true) {
1863 assert_LU_OK;
1864 mid = lower + 1;
1865 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1866 if (mid->pc_offset() < pc_offset) {
1867 lower = mid;
1868 } else {
1869 upper = mid;
1870 break;
1871 }
1872 }
1873 #undef assert_LU_OK
1874
1875 if (match_desc(upper, pc_offset, approximate)) {
1876 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1877 _pc_desc_cache.add_pc_desc(upper);
1878 return upper;
1879 } else {
1880 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1881 return NULL;
1882 }
1883 }
1884
1885
1886 void nmethod::check_all_dependencies(DepChange& changes) {
1887 // Checked dependencies are allocated into this ResourceMark
1888 ResourceMark rm;
1889
1890 // Turn off dependency tracing while actually testing dependencies.
1891 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1892
1893 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1894 &DependencySignature::equals, 11027> DepTable;
1895
1896 DepTable* table = new DepTable();
1897
1898 // Iterate over live nmethods and check dependencies of all nmethods that are not
1899 // marked for deoptimization. A particular dependency is only checked once.
1900 NMethodIterator iter;
1901 while(iter.next()) {
1902 nmethod* nm = iter.method();
1903 // Only notify for live nmethods
1904 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1905 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1906 // Construct abstraction of a dependency.
1907 DependencySignature* current_sig = new DependencySignature(deps);
1908
1909 // Determine if dependency is already checked. table->put(...) returns
1910 // 'true' if the dependency is added (i.e., was not in the hashtable).
1911 if (table->put(*current_sig, 1)) {
1912 if (deps.check_dependency() != NULL) {
1913 // Dependency checking failed. Print out information about the failed
1914 // dependency and finally fail with an assert. We can fail here, since
1915 // dependency checking is never done in a product build.
1916 tty->print_cr("Failed dependency:");
1917 changes.print();
1918 nm->print();
1919 nm->print_dependencies();
1920 assert(false, "Should have been marked for deoptimization");
1921 }
1922 }
1923 }
1924 }
1925 }
1926 }
1927
1928 bool nmethod::check_dependency_on(DepChange& changes) {
1929 // What has happened:
1930 // 1) a new class dependee has been added
1931 // 2) dependee and all its super classes have been marked
1932 bool found_check = false; // set true if we are upset
1933 for (Dependencies::DepStream deps(this); deps.next(); ) {
1934 // Evaluate only relevant dependencies.
1935 if (deps.spot_check_dependency_at(changes) != NULL) {
1936 found_check = true;
1937 NOT_DEBUG(break);
1938 }
1939 }
1940 return found_check;
1941 }
1942
1943 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1944 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1945 Array<Method*>* dependee_methods = dependee_ik->methods();
1946 for (Dependencies::DepStream deps(this); deps.next(); ) {
1947 if (deps.type() == Dependencies::evol_method) {
1948 Method* method = deps.method_argument(0);
1949 for (int j = 0; j < dependee_methods->length(); j++) {
1950 if (dependee_methods->at(j) == method) {
1951 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1952 ResourceMark rm;
1953 log_debug(redefine, class, nmethod)
1954 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1955 _method->method_holder()->external_name(),
1956 _method->name()->as_C_string(),
1957 _method->signature()->as_C_string(),
1958 compile_id(),
1959 method->method_holder()->external_name(),
1960 method->name()->as_C_string(),
1961 method->signature()->as_C_string());
1962 }
1963 if (TraceDependencies || LogCompilation)
1964 deps.log_dependency(dependee);
1965 return true;
1966 }
1967 }
1968 }
1969 }
1970 return false;
1971 }
1972
1973 // Called from mark_for_deoptimization, when dependee is invalidated.
1974 bool nmethod::is_dependent_on_method(Method* dependee) {
1975 for (Dependencies::DepStream deps(this); deps.next(); ) {
1976 if (deps.type() != Dependencies::evol_method)
1977 continue;
1978 Method* method = deps.method_argument(0);
1979 if (method == dependee) return true;
1980 }
1981 return false;
1982 }
1983
1984
1985 bool nmethod::is_patchable_at(address instr_addr) {
1986 assert(insts_contains(instr_addr), "wrong nmethod used");
1987 if (is_zombie()) {
1988 // a zombie may never be patched
1989 return false;
1990 }
1991 return true;
1992 }
1993
1994
1995 address nmethod::continuation_for_implicit_exception(address pc) {
1996 // Exception happened outside inline-cache check code => we are inside
1997 // an active nmethod => use cpc to determine a return address
1998 int exception_offset = pc - code_begin();
1999 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2000 #ifdef ASSERT
2001 if (cont_offset == 0) {
2002 Thread* thread = Thread::current();
2003 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2004 HandleMark hm(thread);
2005 ResourceMark rm(thread);
2006 CodeBlob* cb = CodeCache::find_blob(pc);
2007 assert(cb != NULL && cb == this, "");
2008 ttyLocker ttyl;
2009 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2010 print();
2011 method()->print_codes();
2012 print_code();
2013 print_pcs();
2014 }
2015 #endif
2016 if (cont_offset == 0) {
2017 // Let the normal error handling report the exception
2018 return NULL;
2019 }
2020 return code_begin() + cont_offset;
2021 }
2022
2023
2024
2025 void nmethod_init() {
2026 // make sure you didn't forget to adjust the filler fields
2027 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2028 }
2029
2030
2031 //-------------------------------------------------------------------------------------------
2032
2033
2034 // QQQ might we make this work from a frame??
2035 nmethodLocker::nmethodLocker(address pc) {
2036 CodeBlob* cb = CodeCache::find_blob(pc);
2037 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2038 _nm = cb->as_compiled_method();
2039 lock_nmethod(_nm);
2040 }
2041
2042 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2043 // should pass zombie_ok == true.
2044 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2045 if (cm == NULL) return;
2046 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2047 nmethod* nm = cm->as_nmethod();
2048 Atomic::inc(&nm->_lock_count);
2049 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2050 }
2051
2052 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2053 if (cm == NULL) return;
2054 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2055 nmethod* nm = cm->as_nmethod();
2056 Atomic::dec(&nm->_lock_count);
2057 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2058 }
2059
2060
2061 // -----------------------------------------------------------------------------
2062 // Verification
2063
2064 class VerifyOopsClosure: public OopClosure {
2065 nmethod* _nm;
2066 bool _ok;
2067 public:
2068 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2069 bool ok() { return _ok; }
2070 virtual void do_oop(oop* p) {
2071 if (oopDesc::is_oop_or_null(*p)) return;
2072 if (_ok) {
2073 _nm->print_nmethod(true);
2074 _ok = false;
2075 }
2076 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2077 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2078 }
2079 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2080 };
2081
2082 void nmethod::verify() {
2083
2084 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2085 // seems odd.
2086
2087 if (is_zombie() || is_not_entrant() || is_unloaded())
2088 return;
2089
2090 // Make sure all the entry points are correctly aligned for patching.
2091 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2092
2093 // assert(oopDesc::is_oop(method()), "must be valid");
2094
2095 ResourceMark rm;
2096
2097 if (!CodeCache::contains(this)) {
2098 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2099 }
2100
2101 if(is_native_method() )
2102 return;
2103
2104 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2105 if (nm != this) {
2106 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2107 }
2108
2109 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2110 if (! p->verify(this)) {
2111 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2112 }
2113 }
2114
2115 VerifyOopsClosure voc(this);
2116 oops_do(&voc);
2117 assert(voc.ok(), "embedded oops must be OK");
2118 Universe::heap()->verify_nmethod(this);
2119
2120 verify_scopes();
2121 }
2122
2123
2124 void nmethod::verify_interrupt_point(address call_site) {
2125 // Verify IC only when nmethod installation is finished.
2126 if (!is_not_installed()) {
2127 Thread *cur = Thread::current();
2128 if (CompiledIC_lock->owner() == cur ||
2129 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2130 SafepointSynchronize::is_at_safepoint())) {
2131 CompiledIC_at(this, call_site);
2132 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2133 } else {
2134 MutexLocker ml_verify (CompiledIC_lock);
2135 CompiledIC_at(this, call_site);
2136 }
2137 }
2138
2139 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2140 assert(pd != NULL, "PcDesc must exist");
2141 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2142 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2143 pd->return_oop());
2144 !sd->is_top(); sd = sd->sender()) {
2145 sd->verify();
2146 }
2147 }
2148
2149 void nmethod::verify_scopes() {
2150 if( !method() ) return; // Runtime stubs have no scope
2151 if (method()->is_native()) return; // Ignore stub methods.
2152 // iterate through all interrupt point
2153 // and verify the debug information is valid.
2154 RelocIterator iter((nmethod*)this);
2155 while (iter.next()) {
2156 address stub = NULL;
2157 switch (iter.type()) {
2158 case relocInfo::virtual_call_type:
2159 verify_interrupt_point(iter.addr());
2160 break;
2161 case relocInfo::opt_virtual_call_type:
2162 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2163 verify_interrupt_point(iter.addr());
2164 break;
2165 case relocInfo::static_call_type:
2166 stub = iter.static_call_reloc()->static_stub(false);
2167 //verify_interrupt_point(iter.addr());
2168 break;
2169 case relocInfo::runtime_call_type:
2170 case relocInfo::runtime_call_w_cp_type: {
2171 address destination = iter.reloc()->value();
2172 // Right now there is no way to find out which entries support
2173 // an interrupt point. It would be nice if we had this
2174 // information in a table.
2175 break;
2176 }
2177 default:
2178 break;
2179 }
2180 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2181 }
2182 }
2183
2184
2185 // -----------------------------------------------------------------------------
2186 // Non-product code
2187 #ifndef PRODUCT
2188
2189 class DebugScavengeRoot: public OopClosure {
2190 nmethod* _nm;
2191 bool _ok;
2192 public:
2193 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2194 bool ok() { return _ok; }
2195 virtual void do_oop(oop* p) {
2196 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2197 if (_ok) {
2198 _nm->print_nmethod(true);
2199 _ok = false;
2200 }
2201 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2202 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2203 (*p)->print();
2204 }
2205 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2206 };
2207
2208 void nmethod::verify_scavenge_root_oops() {
2209 if (!on_scavenge_root_list()) {
2210 // Actually look inside, to verify the claim that it's clean.
2211 DebugScavengeRoot debug_scavenge_root(this);
2212 oops_do(&debug_scavenge_root);
2213 if (!debug_scavenge_root.ok())
2214 fatal("found an unadvertised bad scavengable oop in the code cache");
2215 }
2216 assert(scavenge_root_not_marked(), "");
2217 }
2218
2219 #endif // PRODUCT
2220
2221 // Printing operations
2222
2223 void nmethod::print() const {
2224 ResourceMark rm;
2225 ttyLocker ttyl; // keep the following output all in one block
2226
2227 tty->print("Compiled method ");
2228
2229 if (is_compiled_by_c1()) {
2230 tty->print("(c1) ");
2231 } else if (is_compiled_by_c2()) {
2232 tty->print("(c2) ");
2233 } else if (is_compiled_by_jvmci()) {
2234 tty->print("(JVMCI) ");
2235 } else {
2236 tty->print("(nm) ");
2237 }
2238
2239 print_on(tty, NULL);
2240
2241 if (WizardMode) {
2242 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2243 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2244 tty->print(" { ");
2245 tty->print_cr("%s ", state());
2246 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2247 tty->print_cr("}:");
2248 }
2249 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2250 p2i(this),
2251 p2i(this) + size(),
2252 size());
2253 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2254 p2i(relocation_begin()),
2255 p2i(relocation_end()),
2256 relocation_size());
2257 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2258 p2i(consts_begin()),
2259 p2i(consts_end()),
2260 consts_size());
2261 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2262 p2i(insts_begin()),
2263 p2i(insts_end()),
2264 insts_size());
2265 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(stub_begin()),
2267 p2i(stub_end()),
2268 stub_size());
2269 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(oops_begin()),
2271 p2i(oops_end()),
2272 oops_size());
2273 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(metadata_begin()),
2275 p2i(metadata_end()),
2276 metadata_size());
2277 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(scopes_data_begin()),
2279 p2i(scopes_data_end()),
2280 scopes_data_size());
2281 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 p2i(scopes_pcs_begin()),
2283 p2i(scopes_pcs_end()),
2284 scopes_pcs_size());
2285 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 p2i(dependencies_begin()),
2287 p2i(dependencies_end()),
2288 dependencies_size());
2289 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(handler_table_begin()),
2291 p2i(handler_table_end()),
2292 handler_table_size());
2293 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(nul_chk_table_begin()),
2295 p2i(nul_chk_table_end()),
2296 nul_chk_table_size());
2297 }
2298
2299 #ifndef PRODUCT
2300
2301 void nmethod::print_scopes() {
2302 // Find the first pc desc for all scopes in the code and print it.
2303 ResourceMark rm;
2304 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2305 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2306 continue;
2307
2308 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2309 while (sd != NULL) {
2310 sd->print_on(tty, p);
2311 sd = sd->sender();
2312 }
2313 }
2314 }
2315
2316 void nmethod::print_dependencies() {
2317 ResourceMark rm;
2318 ttyLocker ttyl; // keep the following output all in one block
2319 tty->print_cr("Dependencies:");
2320 for (Dependencies::DepStream deps(this); deps.next(); ) {
2321 deps.print_dependency();
2322 Klass* ctxk = deps.context_type();
2323 if (ctxk != NULL) {
2324 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2325 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2326 }
2327 }
2328 deps.log_dependency(); // put it into the xml log also
2329 }
2330 }
2331
2332
2333 void nmethod::print_relocations() {
2334 ResourceMark m; // in case methods get printed via the debugger
2335 tty->print_cr("relocations:");
2336 RelocIterator iter(this);
2337 iter.print();
2338 }
2339
2340
2341 void nmethod::print_pcs() {
2342 ResourceMark m; // in case methods get printed via debugger
2343 tty->print_cr("pc-bytecode offsets:");
2344 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2345 p->print(this);
2346 }
2347 }
2348
2349 void nmethod::print_recorded_oops() {
2350 tty->print_cr("Recorded oops:");
2351 for (int i = 0; i < oops_count(); i++) {
2352 oop o = oop_at(i);
2353 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2354 if (o == Universe::non_oop_word()) {
2355 tty->print("non-oop word");
2356 } else {
2357 if (o != NULL) {
2358 o->print_value();
2359 } else {
2360 tty->print_cr("NULL");
2361 }
2362 }
2363 tty->cr();
2364 }
2365 }
2366
2367 void nmethod::print_recorded_metadata() {
2368 tty->print_cr("Recorded metadata:");
2369 for (int i = 0; i < metadata_count(); i++) {
2370 Metadata* m = metadata_at(i);
2371 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2372 if (m == (Metadata*)Universe::non_oop_word()) {
2373 tty->print("non-metadata word");
2374 } else {
2375 Metadata::print_value_on_maybe_null(tty, m);
2376 }
2377 tty->cr();
2378 }
2379 }
2380
2381 #endif // PRODUCT
2382
2383 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2384 RelocIterator iter(this, begin, end);
2385 bool have_one = false;
2386 while (iter.next()) {
2387 have_one = true;
2388 switch (iter.type()) {
2389 case relocInfo::none: return "no_reloc";
2390 case relocInfo::oop_type: {
2391 stringStream st;
2392 oop_Relocation* r = iter.oop_reloc();
2393 oop obj = r->oop_value();
2394 st.print("oop(");
2395 if (obj == NULL) st.print("NULL");
2396 else obj->print_value_on(&st);
2397 st.print(")");
2398 return st.as_string();
2399 }
2400 case relocInfo::metadata_type: {
2401 stringStream st;
2402 metadata_Relocation* r = iter.metadata_reloc();
2403 Metadata* obj = r->metadata_value();
2404 st.print("metadata(");
2405 if (obj == NULL) st.print("NULL");
2406 else obj->print_value_on(&st);
2407 st.print(")");
2408 return st.as_string();
2409 }
2410 case relocInfo::runtime_call_type:
2411 case relocInfo::runtime_call_w_cp_type: {
2412 stringStream st;
2413 st.print("runtime_call");
2414 CallRelocation* r = (CallRelocation*)iter.reloc();
2415 address dest = r->destination();
2416 CodeBlob* cb = CodeCache::find_blob(dest);
2417 if (cb != NULL) {
2418 st.print(" %s", cb->name());
2419 } else {
2420 ResourceMark rm;
2421 const int buflen = 1024;
2422 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2423 int offset;
2424 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2425 st.print(" %s", buf);
2426 if (offset != 0) {
2427 st.print("+%d", offset);
2428 }
2429 }
2430 }
2431 return st.as_string();
2432 }
2433 case relocInfo::virtual_call_type: {
2434 stringStream st;
2435 st.print_raw("virtual_call");
2436 virtual_call_Relocation* r = iter.virtual_call_reloc();
2437 Method* m = r->method_value();
2438 if (m != NULL) {
2439 assert(m->is_method(), "");
2440 m->print_short_name(&st);
2441 }
2442 return st.as_string();
2443 }
2444 case relocInfo::opt_virtual_call_type: {
2445 stringStream st;
2446 st.print_raw("optimized virtual_call");
2447 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2448 Method* m = r->method_value();
2449 if (m != NULL) {
2450 assert(m->is_method(), "");
2451 m->print_short_name(&st);
2452 }
2453 return st.as_string();
2454 }
2455 case relocInfo::static_call_type: {
2456 stringStream st;
2457 st.print_raw("static_call");
2458 static_call_Relocation* r = iter.static_call_reloc();
2459 Method* m = r->method_value();
2460 if (m != NULL) {
2461 assert(m->is_method(), "");
2462 m->print_short_name(&st);
2463 }
2464 return st.as_string();
2465 }
2466 case relocInfo::static_stub_type: return "static_stub";
2467 case relocInfo::external_word_type: return "external_word";
2468 case relocInfo::internal_word_type: return "internal_word";
2469 case relocInfo::section_word_type: return "section_word";
2470 case relocInfo::poll_type: return "poll";
2471 case relocInfo::poll_return_type: return "poll_return";
2472 case relocInfo::type_mask: return "type_bit_mask";
2473
2474 default:
2475 break;
2476 }
2477 }
2478 return have_one ? "other" : NULL;
2479 }
2480
2481 // Return a the last scope in (begin..end]
2482 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2483 PcDesc* p = pc_desc_near(begin+1);
2484 if (p != NULL && p->real_pc(this) <= end) {
2485 return new ScopeDesc(this, p->scope_decode_offset(),
2486 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2487 p->return_oop());
2488 }
2489 return NULL;
2490 }
2491
2492 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2493 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2494 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2495 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2496 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2497 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2498
2499 if (has_method_handle_invokes())
2500 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2501
2502 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2503
2504 if (block_begin == entry_point()) {
2505 methodHandle m = method();
2506 if (m.not_null()) {
2507 stream->print(" # ");
2508 m->print_value_on(stream);
2509 stream->cr();
2510 }
2511 if (m.not_null() && !is_osr_method()) {
2512 ResourceMark rm;
2513 int sizeargs = m->size_of_parameters();
2514 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2515 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2516 {
2517 int sig_index = 0;
2518 if (!m->is_static())
2519 sig_bt[sig_index++] = T_OBJECT; // 'this'
2520 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2521 BasicType t = ss.type();
2522 sig_bt[sig_index++] = t;
2523 if (type2size[t] == 2) {
2524 sig_bt[sig_index++] = T_VOID;
2525 } else {
2526 assert(type2size[t] == 1, "size is 1 or 2");
2527 }
2528 }
2529 assert(sig_index == sizeargs, "");
2530 }
2531 const char* spname = "sp"; // make arch-specific?
2532 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2533 int stack_slot_offset = this->frame_size() * wordSize;
2534 int tab1 = 14, tab2 = 24;
2535 int sig_index = 0;
2536 int arg_index = (m->is_static() ? 0 : -1);
2537 bool did_old_sp = false;
2538 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2539 bool at_this = (arg_index == -1);
2540 bool at_old_sp = false;
2541 BasicType t = (at_this ? T_OBJECT : ss.type());
2542 assert(t == sig_bt[sig_index], "sigs in sync");
2543 if (at_this)
2544 stream->print(" # this: ");
2545 else
2546 stream->print(" # parm%d: ", arg_index);
2547 stream->move_to(tab1);
2548 VMReg fst = regs[sig_index].first();
2549 VMReg snd = regs[sig_index].second();
2550 if (fst->is_reg()) {
2551 stream->print("%s", fst->name());
2552 if (snd->is_valid()) {
2553 stream->print(":%s", snd->name());
2554 }
2555 } else if (fst->is_stack()) {
2556 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2557 if (offset == stack_slot_offset) at_old_sp = true;
2558 stream->print("[%s+0x%x]", spname, offset);
2559 } else {
2560 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2561 }
2562 stream->print(" ");
2563 stream->move_to(tab2);
2564 stream->print("= ");
2565 if (at_this) {
2566 m->method_holder()->print_value_on(stream);
2567 } else {
2568 bool did_name = false;
2569 if (!at_this && ss.is_object()) {
2570 Symbol* name = ss.as_symbol_or_null();
2571 if (name != NULL) {
2572 name->print_value_on(stream);
2573 did_name = true;
2574 }
2575 }
2576 if (!did_name)
2577 stream->print("%s", type2name(t));
2578 }
2579 if (at_old_sp) {
2580 stream->print(" (%s of caller)", spname);
2581 did_old_sp = true;
2582 }
2583 stream->cr();
2584 sig_index += type2size[t];
2585 arg_index += 1;
2586 if (!at_this) ss.next();
2587 }
2588 if (!did_old_sp) {
2589 stream->print(" # ");
2590 stream->move_to(tab1);
2591 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2592 stream->print(" (%s of caller)", spname);
2593 stream->cr();
2594 }
2595 }
2596 }
2597 }
2598
2599 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2600 // First, find an oopmap in (begin, end].
2601 // We use the odd half-closed interval so that oop maps and scope descs
2602 // which are tied to the byte after a call are printed with the call itself.
2603 address base = code_begin();
2604 ImmutableOopMapSet* oms = oop_maps();
2605 if (oms != NULL) {
2606 for (int i = 0, imax = oms->count(); i < imax; i++) {
2607 const ImmutableOopMapPair* pair = oms->pair_at(i);
2608 const ImmutableOopMap* om = pair->get_from(oms);
2609 address pc = base + pair->pc_offset();
2610 if (pc > begin) {
2611 if (pc <= end) {
2612 st->move_to(column);
2613 st->print("; ");
2614 om->print_on(st);
2615 }
2616 break;
2617 }
2618 }
2619 }
2620
2621 // Print any debug info present at this pc.
2622 ScopeDesc* sd = scope_desc_in(begin, end);
2623 if (sd != NULL) {
2624 st->move_to(column);
2625 if (sd->bci() == SynchronizationEntryBCI) {
2626 st->print(";*synchronization entry");
2627 } else if (sd->bci() == AfterBci) {
2628 st->print(";* method exit (unlocked if synchronized)");
2629 } else if (sd->bci() == UnwindBci) {
2630 st->print(";* unwind (locked if synchronized)");
2631 } else if (sd->bci() == AfterExceptionBci) {
2632 st->print(";* unwind (unlocked if synchronized)");
2633 } else if (sd->bci() == UnknownBci) {
2634 st->print(";* unknown");
2635 } else if (sd->bci() == InvalidFrameStateBci) {
2636 st->print(";* invalid frame state");
2637 } else {
2638 if (sd->method() == NULL) {
2639 st->print("method is NULL");
2640 } else if (sd->method()->is_native()) {
2641 st->print("method is native");
2642 } else {
2643 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2644 st->print(";*%s", Bytecodes::name(bc));
2645 switch (bc) {
2646 case Bytecodes::_invokevirtual:
2647 case Bytecodes::_invokespecial:
2648 case Bytecodes::_invokestatic:
2649 case Bytecodes::_invokeinterface:
2650 {
2651 Bytecode_invoke invoke(sd->method(), sd->bci());
2652 st->print(" ");
2653 if (invoke.name() != NULL)
2654 invoke.name()->print_symbol_on(st);
2655 else
2656 st->print("<UNKNOWN>");
2657 break;
2658 }
2659 case Bytecodes::_getfield:
2660 case Bytecodes::_putfield:
2661 case Bytecodes::_getstatic:
2662 case Bytecodes::_putstatic:
2663 {
2664 Bytecode_field field(sd->method(), sd->bci());
2665 st->print(" ");
2666 if (field.name() != NULL)
2667 field.name()->print_symbol_on(st);
2668 else
2669 st->print("<UNKNOWN>");
2670 }
2671 default:
2672 break;
2673 }
2674 }
2675 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2676 }
2677
2678 // Print all scopes
2679 for (;sd != NULL; sd = sd->sender()) {
2680 st->move_to(column);
2681 st->print("; -");
2682 if (sd->method() == NULL) {
2683 st->print("method is NULL");
2684 } else {
2685 sd->method()->print_short_name(st);
2686 }
2687 int lineno = sd->method()->line_number_from_bci(sd->bci());
2688 if (lineno != -1) {
2689 st->print("@%d (line %d)", sd->bci(), lineno);
2690 } else {
2691 st->print("@%d", sd->bci());
2692 }
2693 st->cr();
2694 }
2695 }
2696
2697 // Print relocation information
2698 const char* str = reloc_string_for(begin, end);
2699 if (str != NULL) {
2700 if (sd != NULL) st->cr();
2701 st->move_to(column);
2702 st->print("; {%s}", str);
2703 }
2704 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2705 if (cont_offset != 0) {
2706 st->move_to(column);
2707 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2708 }
2709
2710 }
2711
2712 class DirectNativeCallWrapper: public NativeCallWrapper {
2713 private:
2714 NativeCall* _call;
2715
2716 public:
2717 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2718
2719 virtual address destination() const { return _call->destination(); }
2720 virtual address instruction_address() const { return _call->instruction_address(); }
2721 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2722 virtual address return_address() const { return _call->return_address(); }
2723
2724 virtual address get_resolve_call_stub(bool is_optimized) const {
2725 if (is_optimized) {
2726 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2727 }
2728 return SharedRuntime::get_resolve_virtual_call_stub();
2729 }
2730
2731 virtual void set_destination_mt_safe(address dest) {
2732 #if INCLUDE_AOT
2733 if (UseAOT) {
2734 CodeBlob* callee = CodeCache::find_blob(dest);
2735 CompiledMethod* cm = callee->as_compiled_method_or_null();
2736 if (cm != NULL && cm->is_far_code()) {
2737 // Temporary fix, see JDK-8143106
2738 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2739 csc->set_to_far(methodHandle(cm->method()), dest);
2740 return;
2741 }
2742 }
2743 #endif
2744 _call->set_destination_mt_safe(dest);
2745 }
2746
2747 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2748 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2749 #if INCLUDE_AOT
2750 if (info.to_aot()) {
2751 csc->set_to_far(method, info.entry());
2752 } else
2753 #endif
2754 {
2755 csc->set_to_interpreted(method, info.entry());
2756 }
2757 }
2758
2759 virtual void verify() const {
2760 // make sure code pattern is actually a call imm32 instruction
2761 _call->verify();
2762 _call->verify_alignment();
2763 }
2764
2765 virtual void verify_resolve_call(address dest) const {
2766 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2767 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2768 }
2769
2770 virtual bool is_call_to_interpreted(address dest) const {
2771 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2772 return cb->contains(dest);
2773 }
2774
2775 virtual bool is_safe_for_patching() const { return false; }
2776
2777 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2778 return nativeMovConstReg_at(r->cached_value());
2779 }
2780
2781 virtual void *get_data(NativeInstruction* instruction) const {
2782 return (void*)((NativeMovConstReg*) instruction)->data();
2783 }
2784
2785 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2786 ((NativeMovConstReg*) instruction)->set_data(data);
2787 }
2788 };
2789
2790 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2791 return new DirectNativeCallWrapper((NativeCall*) call);
2792 }
2793
2794 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2795 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2796 }
2797
2798 address nmethod::call_instruction_address(address pc) const {
2799 if (NativeCall::is_call_before(pc)) {
2800 NativeCall *ncall = nativeCall_before(pc);
2801 return ncall->instruction_address();
2802 }
2803 return NULL;
2804 }
2805
2806 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2807 return CompiledDirectStaticCall::at(call_site);
2808 }
2809
2810 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2811 return CompiledDirectStaticCall::at(call_site);
2812 }
2813
2814 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2815 return CompiledDirectStaticCall::before(return_addr);
2816 }
2817
2818 #ifndef PRODUCT
2819
2820 void nmethod::print_value_on(outputStream* st) const {
2821 st->print("nmethod");
2822 print_on(st, NULL);
2823 }
2824
2825 void nmethod::print_calls(outputStream* st) {
2826 RelocIterator iter(this);
2827 while (iter.next()) {
2828 switch (iter.type()) {
2829 case relocInfo::virtual_call_type:
2830 case relocInfo::opt_virtual_call_type: {
2831 VerifyMutexLocker mc(CompiledIC_lock);
2832 CompiledIC_at(&iter)->print();
2833 break;
2834 }
2835 case relocInfo::static_call_type:
2836 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2837 CompiledDirectStaticCall::at(iter.reloc())->print();
2838 break;
2839 default:
2840 break;
2841 }
2842 }
2843 }
2844
2845 void nmethod::print_handler_table() {
2846 ExceptionHandlerTable(this).print();
2847 }
2848
2849 void nmethod::print_nul_chk_table() {
2850 ImplicitExceptionTable(this).print(code_begin());
2851 }
2852
2853 void nmethod::print_statistics() {
2854 ttyLocker ttyl;
2855 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2856 native_nmethod_stats.print_native_nmethod_stats();
2857 #ifdef COMPILER1
2858 c1_java_nmethod_stats.print_nmethod_stats("C1");
2859 #endif
2860 #ifdef COMPILER2
2861 c2_java_nmethod_stats.print_nmethod_stats("C2");
2862 #endif
2863 #if INCLUDE_JVMCI
2864 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2865 #endif
2866 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2867 DebugInformationRecorder::print_statistics();
2868 #ifndef PRODUCT
2869 pc_nmethod_stats.print_pc_stats();
2870 #endif
2871 Dependencies::print_statistics();
2872 if (xtty != NULL) xtty->tail("statistics");
2873 }
2874
2875 #endif // !PRODUCT
2876
2877 #if INCLUDE_JVMCI
2878 void nmethod::clear_jvmci_installed_code() {
2879 assert_locked_or_safepoint(Patching_lock);
2880 if (_jvmci_installed_code != NULL) {
2881 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2882 _jvmci_installed_code = NULL;
2883 }
2884 }
2885
2886 void nmethod::clear_speculation_log() {
2887 assert_locked_or_safepoint(Patching_lock);
2888 if (_speculation_log != NULL) {
2889 JNIHandles::destroy_weak_global(_speculation_log);
2890 _speculation_log = NULL;
2891 }
2892 }
2893
2894 void nmethod::maybe_invalidate_installed_code() {
2895 assert(Patching_lock->is_locked() ||
2896 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2897 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2898 if (installed_code != NULL) {
2899 // Update the values in the InstalledCode instance if it still refers to this nmethod
2900 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2901 if (nm == this) {
2902 if (!is_alive()) {
2903 // Break the link between nmethod and InstalledCode such that the nmethod
2904 // can subsequently be flushed safely. The link must be maintained while
2905 // the method could have live activations since invalidateInstalledCode
2906 // might want to invalidate all existing activations.
2907 InstalledCode::set_address(installed_code, 0);
2908 InstalledCode::set_entryPoint(installed_code, 0);
2909 } else if (is_not_entrant()) {
2910 // Remove the entry point so any invocation will fail but keep
2911 // the address link around that so that existing activations can
2912 // be invalidated.
2913 InstalledCode::set_entryPoint(installed_code, 0);
2914 }
2915 }
2916 }
2917 if (!is_alive()) {
2918 // Clear these out after the nmethod has been unregistered and any
2919 // updates to the InstalledCode instance have been performed.
2920 clear_jvmci_installed_code();
2921 clear_speculation_log();
2922 }
2923 }
2924
2925 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2926 if (installedCode() == NULL) {
2927 THROW(vmSymbols::java_lang_NullPointerException());
2928 }
2929 jlong nativeMethod = InstalledCode::address(installedCode);
2930 nmethod* nm = (nmethod*)nativeMethod;
2931 if (nm == NULL) {
2932 // Nothing to do
2933 return;
2934 }
2935
2936 nmethodLocker nml(nm);
2937 #ifdef ASSERT
2938 {
2939 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2940 // This relationship can only be checked safely under a lock
2941 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2942 }
2943 #endif
2944
2945 if (nm->is_alive()) {
2946 // Invalidating the InstalledCode means we want the nmethod
2947 // to be deoptimized.
2948 nm->mark_for_deoptimization();
2949 VM_Deoptimize op;
2950 VMThread::execute(&op);
2951 }
2952
2953 // Multiple threads could reach this point so we now need to
2954 // lock and re-check the link to the nmethod so that only one
2955 // thread clears it.
2956 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2957 if (InstalledCode::address(installedCode) == nativeMethod) {
2958 InstalledCode::set_address(installedCode, 0);
2959 }
2960 }
2961
2962 oop nmethod::jvmci_installed_code() {
2963 return JNIHandles::resolve(_jvmci_installed_code);
2964 }
2965
2966 oop nmethod::speculation_log() {
2967 return JNIHandles::resolve(_speculation_log);
2968 }
2969
2970 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
2971 if (!this->is_compiled_by_jvmci()) {
2972 return NULL;
2973 }
2974 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2975 if (installed_code != NULL) {
2976 oop installed_code_name = NULL;
2977 if (installed_code->is_a(InstalledCode::klass())) {
2978 installed_code_name = InstalledCode::name(installed_code);
2979 }
2980 if (installed_code_name != NULL) {
2981 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2982 }
2983 }
2984 return NULL;
2985 }
2986 #endif