1 /*
2 * Copyright (c) 1997, 2017, 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 "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvmtiImpl.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/orderAccess.inline.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/sweeper.hpp"
51 #include "utilities/align.hpp"
52 #include "utilities/dtrace.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/resourceHash.hpp"
55 #include "utilities/xmlstream.hpp"
56 #ifdef SHARK
57 #include "shark/sharkCompiler.hpp"
58 #endif
59 #if INCLUDE_JVMCI
60 #include "jvmci/jvmciJavaClasses.hpp"
61 #endif
62
63 #ifdef DTRACE_ENABLED
64
65 // Only bother with this argument setup if dtrace is available
66
67 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
68 { \
69 Method* m = (method); \
70 if (m != NULL) { \
71 Symbol* klass_name = m->klass_name(); \
72 Symbol* name = m->name(); \
73 Symbol* signature = m->signature(); \
74 HOTSPOT_COMPILED_METHOD_UNLOAD( \
75 (char *) klass_name->bytes(), klass_name->utf8_length(), \
76 (char *) name->bytes(), name->utf8_length(), \
77 (char *) signature->bytes(), signature->utf8_length()); \
78 } \
79 }
80
81 #else // ndef DTRACE_ENABLED
82
83 #define DTRACE_METHOD_UNLOAD_PROBE(method)
84
85 #endif
86
87 //---------------------------------------------------------------------------------
88 // NMethod statistics
89 // They are printed under various flags, including:
90 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
91 // (In the latter two cases, they like other stats are printed to the log only.)
92
93 #ifndef PRODUCT
94 // These variables are put into one block to reduce relocations
95 // and make it simpler to print from the debugger.
96 struct java_nmethod_stats_struct {
97 int nmethod_count;
98 int total_size;
99 int relocation_size;
100 int consts_size;
101 int insts_size;
102 int stub_size;
103 int scopes_data_size;
104 int scopes_pcs_size;
105 int dependencies_size;
106 int handler_table_size;
107 int nul_chk_table_size;
108 int oops_size;
109 int metadata_size;
110
111 void note_nmethod(nmethod* nm) {
112 nmethod_count += 1;
113 total_size += nm->size();
114 relocation_size += nm->relocation_size();
115 consts_size += nm->consts_size();
116 insts_size += nm->insts_size();
117 stub_size += nm->stub_size();
118 oops_size += nm->oops_size();
119 metadata_size += nm->metadata_size();
120 scopes_data_size += nm->scopes_data_size();
121 scopes_pcs_size += nm->scopes_pcs_size();
122 dependencies_size += nm->dependencies_size();
123 handler_table_size += nm->handler_table_size();
124 nul_chk_table_size += nm->nul_chk_table_size();
125 }
126 void print_nmethod_stats(const char* name) {
127 if (nmethod_count == 0) return;
128 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
129 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
130 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
131 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
132 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
133 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
134 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
135 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
136 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
137 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
138 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
139 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
140 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
141 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
142 }
143 };
144
145 struct native_nmethod_stats_struct {
146 int native_nmethod_count;
147 int native_total_size;
148 int native_relocation_size;
149 int native_insts_size;
150 int native_oops_size;
151 int native_metadata_size;
152 void note_native_nmethod(nmethod* nm) {
153 native_nmethod_count += 1;
154 native_total_size += nm->size();
155 native_relocation_size += nm->relocation_size();
156 native_insts_size += nm->insts_size();
157 native_oops_size += nm->oops_size();
158 native_metadata_size += nm->metadata_size();
159 }
160 void print_native_nmethod_stats() {
161 if (native_nmethod_count == 0) return;
162 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
163 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
164 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
165 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
166 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
167 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
168 }
169 };
170
171 struct pc_nmethod_stats_struct {
172 int pc_desc_resets; // number of resets (= number of caches)
173 int pc_desc_queries; // queries to nmethod::find_pc_desc
174 int pc_desc_approx; // number of those which have approximate true
175 int pc_desc_repeats; // number of _pc_descs[0] hits
176 int pc_desc_hits; // number of LRU cache hits
177 int pc_desc_tests; // total number of PcDesc examinations
178 int pc_desc_searches; // total number of quasi-binary search steps
179 int pc_desc_adds; // number of LUR cache insertions
180
181 void print_pc_stats() {
182 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
183 pc_desc_queries,
184 (double)(pc_desc_tests + pc_desc_searches)
185 / pc_desc_queries);
186 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
187 pc_desc_resets,
188 pc_desc_queries, pc_desc_approx,
189 pc_desc_repeats, pc_desc_hits,
190 pc_desc_tests, pc_desc_searches, pc_desc_adds);
191 }
192 };
193
194 #ifdef COMPILER1
195 static java_nmethod_stats_struct c1_java_nmethod_stats;
196 #endif
197 #ifdef COMPILER2
198 static java_nmethod_stats_struct c2_java_nmethod_stats;
199 #endif
200 #if INCLUDE_JVMCI
201 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
202 #endif
203 #ifdef SHARK
204 static java_nmethod_stats_struct shark_java_nmethod_stats;
205 #endif
206 static java_nmethod_stats_struct unknown_java_nmethod_stats;
207
208 static native_nmethod_stats_struct native_nmethod_stats;
209 static pc_nmethod_stats_struct pc_nmethod_stats;
210
211 static void note_java_nmethod(nmethod* nm) {
212 #ifdef COMPILER1
213 if (nm->is_compiled_by_c1()) {
214 c1_java_nmethod_stats.note_nmethod(nm);
215 } else
216 #endif
217 #ifdef COMPILER2
218 if (nm->is_compiled_by_c2()) {
219 c2_java_nmethod_stats.note_nmethod(nm);
220 } else
221 #endif
222 #if INCLUDE_JVMCI
223 if (nm->is_compiled_by_jvmci()) {
224 jvmci_java_nmethod_stats.note_nmethod(nm);
225 } else
226 #endif
227 #ifdef SHARK
228 if (nm->is_compiled_by_shark()) {
229 shark_java_nmethod_stats.note_nmethod(nm);
230 } else
231 #endif
232 {
233 unknown_java_nmethod_stats.note_nmethod(nm);
234 }
235 }
236 #endif // !PRODUCT
237
238 //---------------------------------------------------------------------------------
239
240
241 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
242 assert(pc != NULL, "Must be non null");
243 assert(exception.not_null(), "Must be non null");
244 assert(handler != NULL, "Must be non null");
245
246 _count = 0;
247 _exception_type = exception->klass();
248 _next = NULL;
249
250 add_address_and_handler(pc,handler);
251 }
252
253
254 address ExceptionCache::match(Handle exception, address pc) {
255 assert(pc != NULL,"Must be non null");
256 assert(exception.not_null(),"Must be non null");
257 if (exception->klass() == exception_type()) {
258 return (test_address(pc));
259 }
260
261 return NULL;
262 }
263
264
265 bool ExceptionCache::match_exception_with_space(Handle exception) {
266 assert(exception.not_null(),"Must be non null");
267 if (exception->klass() == exception_type() && count() < cache_size) {
268 return true;
269 }
270 return false;
271 }
272
273
274 address ExceptionCache::test_address(address addr) {
275 int limit = count();
276 for (int i = 0; i < limit; i++) {
277 if (pc_at(i) == addr) {
278 return handler_at(i);
279 }
280 }
281 return NULL;
282 }
283
284
285 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
286 if (test_address(addr) == handler) return true;
287
288 int index = count();
289 if (index < cache_size) {
290 set_pc_at(index, addr);
291 set_handler_at(index, handler);
292 increment_count();
293 return true;
294 }
295 return false;
296 }
297
298 //-----------------------------------------------------------------------------
299
300
301 // Helper used by both find_pc_desc methods.
302 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
303 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
304 if (!approximate)
305 return pc->pc_offset() == pc_offset;
306 else
307 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
308 }
309
310 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
311 if (initial_pc_desc == NULL) {
312 _pc_descs[0] = NULL; // native method; no PcDescs at all
313 return;
314 }
315 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
316 // reset the cache by filling it with benign (non-null) values
317 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
318 for (int i = 0; i < cache_size; i++)
319 _pc_descs[i] = initial_pc_desc;
320 }
321
322 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
324 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
325
326 // Note: one might think that caching the most recently
327 // read value separately would be a win, but one would be
328 // wrong. When many threads are updating it, the cache
329 // line it's in would bounce between caches, negating
330 // any benefit.
331
332 // In order to prevent race conditions do not load cache elements
333 // repeatedly, but use a local copy:
334 PcDesc* res;
335
336 // Step one: Check the most recently added value.
337 res = _pc_descs[0];
338 if (res == NULL) return NULL; // native method; no PcDescs at all
339 if (match_desc(res, pc_offset, approximate)) {
340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
341 return res;
342 }
343
344 // Step two: Check the rest of the LRU cache.
345 for (int i = 1; i < cache_size; ++i) {
346 res = _pc_descs[i];
347 if (res->pc_offset() < 0) break; // optimization: skip empty cache
348 if (match_desc(res, pc_offset, approximate)) {
349 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
350 return res;
351 }
352 }
353
354 // Report failure.
355 return NULL;
356 }
357
358 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
360 // Update the LRU cache by shifting pc_desc forward.
361 for (int i = 0; i < cache_size; i++) {
362 PcDesc* next = _pc_descs[i];
363 _pc_descs[i] = pc_desc;
364 pc_desc = next;
365 }
366 }
367
368 // adjust pcs_size so that it is a multiple of both oopSize and
369 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
370 // of oopSize, then 2*sizeof(PcDesc) is)
371 static int adjust_pcs_size(int pcs_size) {
372 int nsize = align_up(pcs_size, oopSize);
373 if ((nsize % sizeof(PcDesc)) != 0) {
374 nsize = pcs_size + sizeof(PcDesc);
375 }
376 assert((nsize % oopSize) == 0, "correct alignment");
377 return nsize;
378 }
379
380
381 int nmethod::total_size() const {
382 return
383 consts_size() +
384 insts_size() +
385 stub_size() +
386 scopes_data_size() +
387 scopes_pcs_size() +
388 handler_table_size() +
389 nul_chk_table_size();
390 }
391
392 const char* nmethod::compile_kind() const {
393 if (is_osr_method()) return "osr";
394 if (method() != NULL && is_native_method()) return "c2n";
395 return NULL;
396 }
397
398 // Fill in default values for various flag fields
399 void nmethod::init_defaults() {
400 _state = in_use;
401 _has_flushed_dependencies = 0;
402 _lock_count = 0;
403 _stack_traversal_mark = 0;
404 _unload_reported = false; // jvmti state
405 _is_far_code = false; // nmethods are located in CodeCache
406
407 #ifdef ASSERT
408 _oops_are_stale = false;
409 #endif
410
411 _oops_do_mark_link = NULL;
412 _jmethod_id = NULL;
413 _osr_link = NULL;
414 if (UseG1GC) {
415 _unloading_next = NULL;
416 } else {
417 _scavenge_root_link = NULL;
418 }
419 _scavenge_root_state = 0;
420 #if INCLUDE_RTM_OPT
421 _rtm_state = NoRTM;
422 #endif
423 #if INCLUDE_JVMCI
424 _jvmci_installed_code = NULL;
425 _speculation_log = NULL;
426 #endif
427 }
428
429 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
430 int compile_id,
431 CodeBuffer *code_buffer,
432 int vep_offset,
433 int frame_complete,
434 int frame_size,
435 ByteSize basic_lock_owner_sp_offset,
436 ByteSize basic_lock_sp_offset,
437 OopMapSet* oop_maps) {
438 code_buffer->finalize_oop_references(method);
439 // create nmethod
440 nmethod* nm = NULL;
441 {
442 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
443 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
444 CodeOffsets offsets;
445 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
446 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
447 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
448 compile_id, &offsets,
449 code_buffer, frame_size,
450 basic_lock_owner_sp_offset,
451 basic_lock_sp_offset, oop_maps);
452 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
453 }
454 // verify nmethod
455 debug_only(if (nm) nm->verify();) // might block
456
457 if (nm != NULL) {
458 nm->log_new_nmethod();
459 }
460
461 return nm;
462 }
463
464 nmethod* nmethod::new_nmethod(const methodHandle& method,
465 int compile_id,
466 int entry_bci,
467 CodeOffsets* offsets,
468 int orig_pc_offset,
469 DebugInformationRecorder* debug_info,
470 Dependencies* dependencies,
471 CodeBuffer* code_buffer, int frame_size,
472 OopMapSet* oop_maps,
473 ExceptionHandlerTable* handler_table,
474 ImplicitExceptionTable* nul_chk_table,
475 AbstractCompiler* compiler,
476 int comp_level
477 #if INCLUDE_JVMCI
478 , Handle installed_code,
479 Handle speculationLog
480 #endif
481 )
482 {
483 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
484 code_buffer->finalize_oop_references(method);
485 // create nmethod
486 nmethod* nm = NULL;
487 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
488 int nmethod_size =
489 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
490 + adjust_pcs_size(debug_info->pcs_size())
491 + align_up((int)dependencies->size_in_bytes(), oopSize)
492 + align_up(handler_table->size_in_bytes() , oopSize)
493 + align_up(nul_chk_table->size_in_bytes() , oopSize)
494 + align_up(debug_info->data_size() , oopSize);
495
496 nm = new (nmethod_size, comp_level)
497 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
498 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
499 oop_maps,
500 handler_table,
501 nul_chk_table,
502 compiler,
503 comp_level
504 #if INCLUDE_JVMCI
505 , installed_code,
506 speculationLog
507 #endif
508 );
509
510 if (nm != NULL) {
511 // To make dependency checking during class loading fast, record
512 // the nmethod dependencies in the classes it is dependent on.
513 // This allows the dependency checking code to simply walk the
514 // class hierarchy above the loaded class, checking only nmethods
515 // which are dependent on those classes. The slow way is to
516 // check every nmethod for dependencies which makes it linear in
517 // the number of methods compiled. For applications with a lot
518 // classes the slow way is too slow.
519 for (Dependencies::DepStream deps(nm); deps.next(); ) {
520 if (deps.type() == Dependencies::call_site_target_value) {
521 // CallSite dependencies are managed on per-CallSite instance basis.
522 oop call_site = deps.argument_oop(0);
523 MethodHandles::add_dependent_nmethod(call_site, nm);
524 } else {
525 Klass* klass = deps.context_type();
526 if (klass == NULL) {
527 continue; // ignore things like evol_method
528 }
529 // record this nmethod as dependent on this klass
530 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
531 }
532 }
533 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
534 }
535 }
536 // Do verification and logging outside CodeCache_lock.
537 if (nm != NULL) {
538 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
539 DEBUG_ONLY(nm->verify();)
540 nm->log_new_nmethod();
541 }
542 return nm;
543 }
544
545 // For native wrappers
546 nmethod::nmethod(
547 Method* method,
548 CompilerType type,
549 int nmethod_size,
550 int compile_id,
551 CodeOffsets* offsets,
552 CodeBuffer* code_buffer,
553 int frame_size,
554 ByteSize basic_lock_owner_sp_offset,
555 ByteSize basic_lock_sp_offset,
556 OopMapSet* oop_maps )
557 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
558 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
559 _native_basic_lock_sp_offset(basic_lock_sp_offset)
560 {
561 {
562 int scopes_data_offset = 0;
563 int deoptimize_offset = 0;
564 int deoptimize_mh_offset = 0;
565
566 debug_only(NoSafepointVerifier nsv;)
567 assert_locked_or_safepoint(CodeCache_lock);
568
569 init_defaults();
570 _entry_bci = InvocationEntryBci;
571 // We have no exception handler or deopt handler make the
572 // values something that will never match a pc like the nmethod vtable entry
573 _exception_offset = 0;
574 _orig_pc_offset = 0;
575
576 _consts_offset = data_offset();
577 _stub_offset = data_offset();
578 _oops_offset = data_offset();
579 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
580 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
581 _scopes_pcs_offset = scopes_data_offset;
582 _dependencies_offset = _scopes_pcs_offset;
583 _handler_table_offset = _dependencies_offset;
584 _nul_chk_table_offset = _handler_table_offset;
585 _nmethod_end_offset = _nul_chk_table_offset;
586 _compile_id = compile_id;
587 _comp_level = CompLevel_none;
588 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
589 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
590 _osr_entry_point = NULL;
591 _exception_cache = NULL;
592 _pc_desc_container.reset_to(NULL);
593 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
594
595 _scopes_data_begin = (address) this + scopes_data_offset;
596 _deopt_handler_begin = (address) this + deoptimize_offset;
597 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
598
599 code_buffer->copy_code_and_locs_to(this);
600 code_buffer->copy_values_to(this);
601 if (ScavengeRootsInCode) {
602 if (detect_scavenge_root_oops()) {
603 CodeCache::add_scavenge_root_nmethod(this);
604 }
605 Universe::heap()->register_nmethod(this);
606 }
607 debug_only(verify_scavenge_root_oops());
608 CodeCache::commit(this);
609 }
610
611 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
612 ttyLocker ttyl; // keep the following output all in one block
613 // This output goes directly to the tty, not the compiler log.
614 // To enable tools to match it up with the compilation activity,
615 // be sure to tag this tty output with the compile ID.
616 if (xtty != NULL) {
617 xtty->begin_head("print_native_nmethod");
618 xtty->method(_method);
619 xtty->stamp();
620 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
621 }
622 // print the header part first
623 print();
624 // then print the requested information
625 if (PrintNativeNMethods) {
626 print_code();
627 if (oop_maps != NULL) {
628 oop_maps->print();
629 }
630 }
631 if (PrintRelocations) {
632 print_relocations();
633 }
634 if (xtty != NULL) {
635 xtty->tail("print_native_nmethod");
636 }
637 }
638 }
639
640 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
641 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
642 }
643
644 nmethod::nmethod(
645 Method* method,
646 CompilerType type,
647 int nmethod_size,
648 int compile_id,
649 int entry_bci,
650 CodeOffsets* offsets,
651 int orig_pc_offset,
652 DebugInformationRecorder* debug_info,
653 Dependencies* dependencies,
654 CodeBuffer *code_buffer,
655 int frame_size,
656 OopMapSet* oop_maps,
657 ExceptionHandlerTable* handler_table,
658 ImplicitExceptionTable* nul_chk_table,
659 AbstractCompiler* compiler,
660 int comp_level
661 #if INCLUDE_JVMCI
662 , Handle installed_code,
663 Handle speculation_log
664 #endif
665 )
666 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
667 _native_receiver_sp_offset(in_ByteSize(-1)),
668 _native_basic_lock_sp_offset(in_ByteSize(-1))
669 {
670 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
671 {
672 debug_only(NoSafepointVerifier nsv;)
673 assert_locked_or_safepoint(CodeCache_lock);
674
675 _deopt_handler_begin = (address) this;
676 _deopt_mh_handler_begin = (address) this;
677
678 init_defaults();
679 _entry_bci = entry_bci;
680 _compile_id = compile_id;
681 _comp_level = comp_level;
682 _orig_pc_offset = orig_pc_offset;
683 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
684
685 // Section offsets
686 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
687 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
688 set_ctable_begin(header_begin() + _consts_offset);
689
690 #if INCLUDE_JVMCI
691 _jvmci_installed_code = installed_code();
692 _speculation_log = (instanceOop)speculation_log();
693
694 if (compiler->is_jvmci()) {
695 // JVMCI might not produce any stub sections
696 if (offsets->value(CodeOffsets::Exceptions) != -1) {
697 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
698 } else {
699 _exception_offset = -1;
700 }
701 if (offsets->value(CodeOffsets::Deopt) != -1) {
702 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
703 } else {
704 _deopt_handler_begin = NULL;
705 }
706 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
707 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
708 } else {
709 _deopt_mh_handler_begin = NULL;
710 }
711 } else {
712 #endif
713 // Exception handler and deopt handler are in the stub section
714 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
715 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
716
717 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
718 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
719 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
720 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
721 } else {
722 _deopt_mh_handler_begin = NULL;
723 #if INCLUDE_JVMCI
724 }
725 #endif
726 }
727 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
728 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
729 } else {
730 _unwind_handler_offset = -1;
731 }
732
733 _oops_offset = data_offset();
734 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
735 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
736
737 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
738 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
739 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
740 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
741 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
742 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
743 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
744 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
745 _exception_cache = NULL;
746
747 _scopes_data_begin = (address) this + scopes_data_offset;
748
749 _pc_desc_container.reset_to(scopes_pcs_begin());
750
751 code_buffer->copy_code_and_locs_to(this);
752 // Copy contents of ScopeDescRecorder to nmethod
753 code_buffer->copy_values_to(this);
754 debug_info->copy_to(this);
755 dependencies->copy_to(this);
756 if (ScavengeRootsInCode) {
757 if (detect_scavenge_root_oops()) {
758 CodeCache::add_scavenge_root_nmethod(this);
759 }
760 Universe::heap()->register_nmethod(this);
761 }
762 debug_only(verify_scavenge_root_oops());
763
764 CodeCache::commit(this);
765
766 // Copy contents of ExceptionHandlerTable to nmethod
767 handler_table->copy_to(this);
768 nul_chk_table->copy_to(this);
769
770 // we use the information of entry points to find out if a method is
771 // static or non static
772 assert(compiler->is_c2() || compiler->is_jvmci() ||
773 _method->is_static() == (entry_point() == _verified_entry_point),
774 " entry points must be same for static methods and vice versa");
775 }
776 }
777
778 // Print a short set of xml attributes to identify this nmethod. The
779 // output should be embedded in some other element.
780 void nmethod::log_identity(xmlStream* log) const {
781 log->print(" compile_id='%d'", compile_id());
782 const char* nm_kind = compile_kind();
783 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
784 log->print(" compiler='%s'", compiler_name());
785 if (TieredCompilation) {
786 log->print(" level='%d'", comp_level());
787 }
788 }
789
790
791 #define LOG_OFFSET(log, name) \
792 if (p2i(name##_end()) - p2i(name##_begin())) \
793 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
794 p2i(name##_begin()) - p2i(this))
795
796
797 void nmethod::log_new_nmethod() const {
798 if (LogCompilation && xtty != NULL) {
799 ttyLocker ttyl;
800 HandleMark hm;
801 xtty->begin_elem("nmethod");
802 log_identity(xtty);
803 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
804 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
805
806 LOG_OFFSET(xtty, relocation);
807 LOG_OFFSET(xtty, consts);
808 LOG_OFFSET(xtty, insts);
809 LOG_OFFSET(xtty, stub);
810 LOG_OFFSET(xtty, scopes_data);
811 LOG_OFFSET(xtty, scopes_pcs);
812 LOG_OFFSET(xtty, dependencies);
813 LOG_OFFSET(xtty, handler_table);
814 LOG_OFFSET(xtty, nul_chk_table);
815 LOG_OFFSET(xtty, oops);
816 LOG_OFFSET(xtty, metadata);
817
818 xtty->method(method());
819 xtty->stamp();
820 xtty->end_elem();
821 }
822 }
823
824 #undef LOG_OFFSET
825
826
827 // Print out more verbose output usually for a newly created nmethod.
828 void nmethod::print_on(outputStream* st, const char* msg) const {
829 if (st != NULL) {
830 ttyLocker ttyl;
831 if (WizardMode) {
832 CompileTask::print(st, this, msg, /*short_form:*/ true);
833 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
834 } else {
835 CompileTask::print(st, this, msg, /*short_form:*/ false);
836 }
837 }
838 }
839
840 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
841 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
842 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
843 print_nmethod(printnmethods);
844 }
845 }
846
847 void nmethod::print_nmethod(bool printmethod) {
848 ttyLocker ttyl; // keep the following output all in one block
849 if (xtty != NULL) {
850 xtty->begin_head("print_nmethod");
851 xtty->stamp();
852 xtty->end_head();
853 }
854 // print the header part first
855 print();
856 // then print the requested information
857 if (printmethod) {
858 print_code();
859 print_pcs();
860 if (oop_maps()) {
861 oop_maps()->print();
862 }
863 }
864 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
865 print_scopes();
866 }
867 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
868 print_relocations();
869 }
870 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
871 print_dependencies();
872 }
873 if (printmethod || PrintExceptionHandlers) {
874 print_handler_table();
875 print_nul_chk_table();
876 }
877 if (printmethod) {
878 print_recorded_oops();
879 print_recorded_metadata();
880 }
881 if (xtty != NULL) {
882 xtty->tail("print_nmethod");
883 }
884 }
885
886
887 // Promote one word from an assembly-time handle to a live embedded oop.
888 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
889 if (handle == NULL ||
890 // As a special case, IC oops are initialized to 1 or -1.
891 handle == (jobject) Universe::non_oop_word()) {
892 (*dest) = (oop) handle;
893 } else {
894 (*dest) = JNIHandles::resolve_non_null(handle);
895 }
896 }
897
898
899 // Have to have the same name because it's called by a template
900 void nmethod::copy_values(GrowableArray<jobject>* array) {
901 int length = array->length();
902 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
903 oop* dest = oops_begin();
904 for (int index = 0 ; index < length; index++) {
905 initialize_immediate_oop(&dest[index], array->at(index));
906 }
907
908 // Now we can fix up all the oops in the code. We need to do this
909 // in the code because the assembler uses jobjects as placeholders.
910 // The code and relocations have already been initialized by the
911 // CodeBlob constructor, so it is valid even at this early point to
912 // iterate over relocations and patch the code.
913 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
914 }
915
916 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
917 int length = array->length();
918 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
919 Metadata** dest = metadata_begin();
920 for (int index = 0 ; index < length; index++) {
921 dest[index] = array->at(index);
922 }
923 }
924
925 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
926 // re-patch all oop-bearing instructions, just in case some oops moved
927 RelocIterator iter(this, begin, end);
928 while (iter.next()) {
929 if (iter.type() == relocInfo::oop_type) {
930 oop_Relocation* reloc = iter.oop_reloc();
931 if (initialize_immediates && reloc->oop_is_immediate()) {
932 oop* dest = reloc->oop_addr();
933 initialize_immediate_oop(dest, (jobject) *dest);
934 }
935 // Refresh the oop-related bits of this instruction.
936 reloc->fix_oop_relocation();
937 } else if (iter.type() == relocInfo::metadata_type) {
938 metadata_Relocation* reloc = iter.metadata_reloc();
939 reloc->fix_metadata_relocation();
940 }
941 }
942 }
943
944
945 void nmethod::verify_clean_inline_caches() {
946 assert_locked_or_safepoint(CompiledIC_lock);
947
948 // If the method is not entrant or zombie then a JMP is plastered over the
949 // first few bytes. If an oop in the old code was there, that oop
950 // should not get GC'd. Skip the first few bytes of oops on
951 // not-entrant methods.
952 address low_boundary = verified_entry_point();
953 if (!is_in_use()) {
954 low_boundary += NativeJump::instruction_size;
955 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
956 // This means that the low_boundary is going to be a little too high.
957 // This shouldn't matter, since oops of non-entrant methods are never used.
958 // In fact, why are we bothering to look at oops in a non-entrant method??
959 }
960
961 ResourceMark rm;
962 RelocIterator iter(this, low_boundary);
963 while(iter.next()) {
964 switch(iter.type()) {
965 case relocInfo::virtual_call_type:
966 case relocInfo::opt_virtual_call_type: {
967 CompiledIC *ic = CompiledIC_at(&iter);
968 // Ok, to lookup references to zombies here
969 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
970 nmethod* nm = cb->as_nmethod_or_null();
971 if( nm != NULL ) {
972 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
973 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
974 assert(ic->is_clean(), "IC should be clean");
975 }
976 }
977 break;
978 }
979 case relocInfo::static_call_type: {
980 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
981 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
982 nmethod* nm = cb->as_nmethod_or_null();
983 if( nm != NULL ) {
984 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
985 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
986 assert(csc->is_clean(), "IC should be clean");
987 }
988 }
989 break;
990 }
991 default:
992 break;
993 }
994 }
995 }
996
997 // This is a private interface with the sweeper.
998 void nmethod::mark_as_seen_on_stack() {
999 assert(is_alive(), "Must be an alive method");
1000 // Set the traversal mark to ensure that the sweeper does 2
1001 // cleaning passes before moving to zombie.
1002 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1003 }
1004
1005 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1006 // there are no activations on the stack, not in use by the VM,
1007 // and not in use by the ServiceThread)
1008 bool nmethod::can_convert_to_zombie() {
1009 assert(is_not_entrant(), "must be a non-entrant method");
1010
1011 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1012 // count can be greater than the stack traversal count before it hits the
1013 // nmethod for the second time.
1014 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1015 !is_locked_by_vm();
1016 }
1017
1018 void nmethod::inc_decompile_count() {
1019 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1020 // Could be gated by ProfileTraps, but do not bother...
1021 Method* m = method();
1022 if (m == NULL) return;
1023 MethodData* mdo = m->method_data();
1024 if (mdo == NULL) return;
1025 // There is a benign race here. See comments in methodData.hpp.
1026 mdo->inc_decompile_count();
1027 }
1028
1029 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1030
1031 post_compiled_method_unload();
1032
1033 // Since this nmethod is being unloaded, make sure that dependencies
1034 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1035 // indicate that this work is being done during a GC.
1036 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1037 assert(is_alive != NULL, "Should be non-NULL");
1038 // A non-NULL is_alive closure indicates that this is being called during GC.
1039 flush_dependencies(is_alive);
1040
1041 // Break cycle between nmethod & method
1042 LogTarget(Trace, class, unload) lt;
1043 if (lt.is_enabled()) {
1044 LogStream ls(lt);
1045 ls.print_cr("making nmethod " INTPTR_FORMAT
1046 " unloadable, Method*(" INTPTR_FORMAT
1047 "), cause(" INTPTR_FORMAT ")",
1048 p2i(this), p2i(_method), p2i(cause));
1049 if (!Universe::heap()->is_gc_active())
1050 cause->klass()->print_on(&ls);
1051 }
1052 // Unlink the osr method, so we do not look this up again
1053 if (is_osr_method()) {
1054 // Invalidate the osr nmethod only once
1055 if (is_in_use()) {
1056 invalidate_osr_method();
1057 }
1058 #ifdef ASSERT
1059 if (method() != NULL) {
1060 // Make sure osr nmethod is invalidated, i.e. not on the list
1061 bool found = method()->method_holder()->remove_osr_nmethod(this);
1062 assert(!found, "osr nmethod should have been invalidated");
1063 }
1064 #endif
1065 }
1066
1067 // If _method is already NULL the Method* is about to be unloaded,
1068 // so we don't have to break the cycle. Note that it is possible to
1069 // have the Method* live here, in case we unload the nmethod because
1070 // it is pointing to some oop (other than the Method*) being unloaded.
1071 if (_method != NULL) {
1072 // OSR methods point to the Method*, but the Method* does not
1073 // point back!
1074 if (_method->code() == this) {
1075 _method->clear_code(); // Break a cycle
1076 }
1077 _method = NULL; // Clear the method of this dead nmethod
1078 }
1079
1080 // Make the class unloaded - i.e., change state and notify sweeper
1081 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1082 if (is_in_use()) {
1083 // Transitioning directly from live to unloaded -- so
1084 // we need to force a cache clean-up; remember this
1085 // for later on.
1086 CodeCache::set_needs_cache_clean(true);
1087 }
1088
1089 // Unregister must be done before the state change
1090 Universe::heap()->unregister_nmethod(this);
1091
1092 _state = unloaded;
1093
1094 // Log the unloading.
1095 log_state_change();
1096
1097 #if INCLUDE_JVMCI
1098 // The method can only be unloaded after the pointer to the installed code
1099 // Java wrapper is no longer alive. Here we need to clear out this weak
1100 // reference to the dead object. Nulling out the reference has to happen
1101 // after the method is unregistered since the original value may be still
1102 // tracked by the rset.
1103 maybe_invalidate_installed_code();
1104 // Clear these out after the nmethod has been unregistered and any
1105 // updates to the InstalledCode instance have been performed.
1106 _jvmci_installed_code = NULL;
1107 _speculation_log = NULL;
1108 #endif
1109
1110 // The Method* is gone at this point
1111 assert(_method == NULL, "Tautology");
1112
1113 set_osr_link(NULL);
1114 NMethodSweeper::report_state_change(this);
1115 }
1116
1117 void nmethod::invalidate_osr_method() {
1118 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1119 // Remove from list of active nmethods
1120 if (method() != NULL) {
1121 method()->method_holder()->remove_osr_nmethod(this);
1122 }
1123 }
1124
1125 void nmethod::log_state_change() const {
1126 if (LogCompilation) {
1127 if (xtty != NULL) {
1128 ttyLocker ttyl; // keep the following output all in one block
1129 if (_state == unloaded) {
1130 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1131 os::current_thread_id());
1132 } else {
1133 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1134 os::current_thread_id(),
1135 (_state == zombie ? " zombie='1'" : ""));
1136 }
1137 log_identity(xtty);
1138 xtty->stamp();
1139 xtty->end_elem();
1140 }
1141 }
1142
1143 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1144 CompileTask::print_ul(this, state_msg);
1145 if (PrintCompilation && _state != unloaded) {
1146 print_on(tty, state_msg);
1147 }
1148 }
1149
1150 /**
1151 * Common functionality for both make_not_entrant and make_zombie
1152 */
1153 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1154 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1155 assert(!is_zombie(), "should not already be a zombie");
1156
1157 if (_state == state) {
1158 // Avoid taking the lock if already in required state.
1159 // This is safe from races because the state is an end-state,
1160 // which the nmethod cannot back out of once entered.
1161 // No need for fencing either.
1162 return false;
1163 }
1164
1165 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1166 nmethodLocker nml(this);
1167 methodHandle the_method(method());
1168 NoSafepointVerifier nsv;
1169
1170 // during patching, depending on the nmethod state we must notify the GC that
1171 // code has been unloaded, unregistering it. We cannot do this right while
1172 // holding the Patching_lock because we need to use the CodeCache_lock. This
1173 // would be prone to deadlocks.
1174 // This flag is used to remember whether we need to later lock and unregister.
1175 bool nmethod_needs_unregister = false;
1176
1177 {
1178 // invalidate osr nmethod before acquiring the patching lock since
1179 // they both acquire leaf locks and we don't want a deadlock.
1180 // This logic is equivalent to the logic below for patching the
1181 // verified entry point of regular methods. We check that the
1182 // nmethod is in use to ensure that it is invalidated only once.
1183 if (is_osr_method() && is_in_use()) {
1184 // this effectively makes the osr nmethod not entrant
1185 invalidate_osr_method();
1186 }
1187
1188 // Enter critical section. Does not block for safepoint.
1189 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1190
1191 if (_state == state) {
1192 // another thread already performed this transition so nothing
1193 // to do, but return false to indicate this.
1194 return false;
1195 }
1196
1197 // The caller can be calling the method statically or through an inline
1198 // cache call.
1199 if (!is_osr_method() && !is_not_entrant()) {
1200 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1201 SharedRuntime::get_handle_wrong_method_stub());
1202 }
1203
1204 if (is_in_use() && update_recompile_counts()) {
1205 // It's a true state change, so mark the method as decompiled.
1206 // Do it only for transition from alive.
1207 inc_decompile_count();
1208 }
1209
1210 // If the state is becoming a zombie, signal to unregister the nmethod with
1211 // the heap.
1212 // This nmethod may have already been unloaded during a full GC.
1213 if ((state == zombie) && !is_unloaded()) {
1214 nmethod_needs_unregister = true;
1215 }
1216
1217 // Must happen before state change. Otherwise we have a race condition in
1218 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1219 // transition its state from 'not_entrant' to 'zombie' without having to wait
1220 // for stack scanning.
1221 if (state == not_entrant) {
1222 mark_as_seen_on_stack();
1223 OrderAccess::storestore();
1224 }
1225
1226 // Change state
1227 _state = state;
1228
1229 // Log the transition once
1230 log_state_change();
1231
1232 // Invalidate while holding the patching lock
1233 JVMCI_ONLY(maybe_invalidate_installed_code());
1234
1235 // Remove nmethod from method.
1236 // We need to check if both the _code and _from_compiled_code_entry_point
1237 // refer to this nmethod because there is a race in setting these two fields
1238 // in Method* as seen in bugid 4947125.
1239 // If the vep() points to the zombie nmethod, the memory for the nmethod
1240 // could be flushed and the compiler and vtable stubs could still call
1241 // through it.
1242 if (method() != NULL && (method()->code() == this ||
1243 method()->from_compiled_entry() == verified_entry_point())) {
1244 HandleMark hm;
1245 method()->clear_code(false /* already owns Patching_lock */);
1246 }
1247 } // leave critical region under Patching_lock
1248
1249 #ifdef ASSERT
1250 if (is_osr_method() && method() != NULL) {
1251 // Make sure osr nmethod is invalidated, i.e. not on the list
1252 bool found = method()->method_holder()->remove_osr_nmethod(this);
1253 assert(!found, "osr nmethod should have been invalidated");
1254 }
1255 #endif
1256
1257 // When the nmethod becomes zombie it is no longer alive so the
1258 // dependencies must be flushed. nmethods in the not_entrant
1259 // state will be flushed later when the transition to zombie
1260 // happens or they get unloaded.
1261 if (state == zombie) {
1262 {
1263 // Flushing dependencies must be done before any possible
1264 // safepoint can sneak in, otherwise the oops used by the
1265 // dependency logic could have become stale.
1266 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1267 if (nmethod_needs_unregister) {
1268 Universe::heap()->unregister_nmethod(this);
1269 #ifdef JVMCI
1270 _jvmci_installed_code = NULL;
1271 _speculation_log = NULL;
1272 #endif
1273 }
1274 flush_dependencies(NULL);
1275 }
1276
1277 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1278 // event and it hasn't already been reported for this nmethod then
1279 // report it now. The event may have been reported earlier if the GC
1280 // marked it for unloading). JvmtiDeferredEventQueue support means
1281 // we no longer go to a safepoint here.
1282 post_compiled_method_unload();
1283
1284 #ifdef ASSERT
1285 // It's no longer safe to access the oops section since zombie
1286 // nmethods aren't scanned for GC.
1287 _oops_are_stale = true;
1288 #endif
1289 // the Method may be reclaimed by class unloading now that the
1290 // nmethod is in zombie state
1291 set_method(NULL);
1292 } else {
1293 assert(state == not_entrant, "other cases may need to be handled differently");
1294 }
1295
1296 if (TraceCreateZombies) {
1297 ResourceMark m;
1298 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1299 }
1300
1301 NMethodSweeper::report_state_change(this);
1302 return true;
1303 }
1304
1305 void nmethod::flush() {
1306 // Note that there are no valid oops in the nmethod anymore.
1307 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1308 "osr nmethod must be unloaded or zombie before flushing");
1309 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1310 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1311 assert_locked_or_safepoint(CodeCache_lock);
1312
1313 // completely deallocate this method
1314 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1315 if (PrintMethodFlushing) {
1316 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1317 "/Free CodeCache:" SIZE_FORMAT "Kb",
1318 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1319 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1320 }
1321
1322 // We need to deallocate any ExceptionCache data.
1323 // Note that we do not need to grab the nmethod lock for this, it
1324 // better be thread safe if we're disposing of it!
1325 ExceptionCache* ec = exception_cache();
1326 set_exception_cache(NULL);
1327 while(ec != NULL) {
1328 ExceptionCache* next = ec->next();
1329 delete ec;
1330 ec = next;
1331 }
1332
1333 if (on_scavenge_root_list()) {
1334 CodeCache::drop_scavenge_root_nmethod(this);
1335 }
1336
1337 #ifdef SHARK
1338 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1339 #endif // SHARK
1340
1341 CodeBlob::flush();
1342 CodeCache::free(this);
1343 }
1344
1345 //
1346 // Notify all classes this nmethod is dependent on that it is no
1347 // longer dependent. This should only be called in two situations.
1348 // First, when a nmethod transitions to a zombie all dependents need
1349 // to be clear. Since zombification happens at a safepoint there's no
1350 // synchronization issues. The second place is a little more tricky.
1351 // During phase 1 of mark sweep class unloading may happen and as a
1352 // result some nmethods may get unloaded. In this case the flushing
1353 // of dependencies must happen during phase 1 since after GC any
1354 // dependencies in the unloaded nmethod won't be updated, so
1355 // traversing the dependency information in unsafe. In that case this
1356 // function is called with a non-NULL argument and this function only
1357 // notifies instanceKlasses that are reachable
1358
1359 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1360 assert_locked_or_safepoint(CodeCache_lock);
1361 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1362 "is_alive is non-NULL if and only if we are called during GC");
1363 if (!has_flushed_dependencies()) {
1364 set_has_flushed_dependencies();
1365 for (Dependencies::DepStream deps(this); deps.next(); ) {
1366 if (deps.type() == Dependencies::call_site_target_value) {
1367 // CallSite dependencies are managed on per-CallSite instance basis.
1368 oop call_site = deps.argument_oop(0);
1369 MethodHandles::remove_dependent_nmethod(call_site, this);
1370 } else {
1371 Klass* klass = deps.context_type();
1372 if (klass == NULL) {
1373 continue; // ignore things like evol_method
1374 }
1375 // During GC the is_alive closure is non-NULL, and is used to
1376 // determine liveness of dependees that need to be updated.
1377 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1378 // The GC defers deletion of this entry, since there might be multiple threads
1379 // iterating over the _dependencies graph. Other call paths are single-threaded
1380 // and may delete it immediately.
1381 bool delete_immediately = is_alive == NULL;
1382 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1383 }
1384 }
1385 }
1386 }
1387 }
1388
1389
1390 // If this oop is not live, the nmethod can be unloaded.
1391 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1392 assert(root != NULL, "just checking");
1393 oop obj = *root;
1394 if (obj == NULL || is_alive->do_object_b(obj)) {
1395 return false;
1396 }
1397
1398 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1399 // simply because one of its constant oops has gone dead.
1400 // No actual classes need to be unloaded in order for this to occur.
1401 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1402 make_unloaded(is_alive, obj);
1403 return true;
1404 }
1405
1406 // ------------------------------------------------------------------
1407 // post_compiled_method_load_event
1408 // new method for install_code() path
1409 // Transfer information from compilation to jvmti
1410 void nmethod::post_compiled_method_load_event() {
1411
1412 Method* moop = method();
1413 HOTSPOT_COMPILED_METHOD_LOAD(
1414 (char *) moop->klass_name()->bytes(),
1415 moop->klass_name()->utf8_length(),
1416 (char *) moop->name()->bytes(),
1417 moop->name()->utf8_length(),
1418 (char *) moop->signature()->bytes(),
1419 moop->signature()->utf8_length(),
1420 insts_begin(), insts_size());
1421
1422 if (JvmtiExport::should_post_compiled_method_load() ||
1423 JvmtiExport::should_post_compiled_method_unload()) {
1424 get_and_cache_jmethod_id();
1425 }
1426
1427 if (JvmtiExport::should_post_compiled_method_load()) {
1428 // Let the Service thread (which is a real Java thread) post the event
1429 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1430 JvmtiDeferredEventQueue::enqueue(
1431 JvmtiDeferredEvent::compiled_method_load_event(this));
1432 }
1433 }
1434
1435 jmethodID nmethod::get_and_cache_jmethod_id() {
1436 if (_jmethod_id == NULL) {
1437 // Cache the jmethod_id since it can no longer be looked up once the
1438 // method itself has been marked for unloading.
1439 _jmethod_id = method()->jmethod_id();
1440 }
1441 return _jmethod_id;
1442 }
1443
1444 void nmethod::post_compiled_method_unload() {
1445 if (unload_reported()) {
1446 // During unloading we transition to unloaded and then to zombie
1447 // and the unloading is reported during the first transition.
1448 return;
1449 }
1450
1451 assert(_method != NULL && !is_unloaded(), "just checking");
1452 DTRACE_METHOD_UNLOAD_PROBE(method());
1453
1454 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1455 // post the event. Sometime later this nmethod will be made a zombie
1456 // by the sweeper but the Method* will not be valid at that point.
1457 // If the _jmethod_id is null then no load event was ever requested
1458 // so don't bother posting the unload. The main reason for this is
1459 // that the jmethodID is a weak reference to the Method* so if
1460 // it's being unloaded there's no way to look it up since the weak
1461 // ref will have been cleared.
1462 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1463 assert(!unload_reported(), "already unloaded");
1464 JvmtiDeferredEvent event =
1465 JvmtiDeferredEvent::compiled_method_unload_event(this,
1466 _jmethod_id, insts_begin());
1467 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1468 JvmtiDeferredEventQueue::enqueue(event);
1469 }
1470
1471 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1472 // any time. As the nmethod is being unloaded now we mark it has
1473 // having the unload event reported - this will ensure that we don't
1474 // attempt to report the event in the unlikely scenario where the
1475 // event is enabled at the time the nmethod is made a zombie.
1476 set_unload_reported();
1477 }
1478
1479 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1480 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1481
1482 oop_Relocation* r = iter_at_oop->oop_reloc();
1483 // Traverse those oops directly embedded in the code.
1484 // Other oops (oop_index>0) are seen as part of scopes_oops.
1485 assert(1 == (r->oop_is_immediate()) +
1486 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1487 "oop must be found in exactly one place");
1488 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1489 // Unload this nmethod if the oop is dead.
1490 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1491 return true;;
1492 }
1493 }
1494
1495 return false;
1496 }
1497
1498 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1499 // Scopes
1500 for (oop* p = oops_begin(); p < oops_end(); p++) {
1501 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1502 if (can_unload(is_alive, p, unloading_occurred)) {
1503 return true;
1504 }
1505 }
1506 return false;
1507 }
1508
1509 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1510 // Compiled code
1511 {
1512 RelocIterator iter(this, low_boundary);
1513 while (iter.next()) {
1514 if (iter.type() == relocInfo::oop_type) {
1515 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1516 return true;
1517 }
1518 }
1519 }
1520 }
1521
1522 return do_unloading_scopes(is_alive, unloading_occurred);
1523 }
1524
1525 #if INCLUDE_JVMCI
1526 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1527 bool is_unloaded = false;
1528 // Follow JVMCI method
1529 BarrierSet* bs = Universe::heap()->barrier_set();
1530 if (_jvmci_installed_code != NULL) {
1531 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1532 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1533 clear_jvmci_installed_code();
1534 }
1535 } else {
1536 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1537 return true;
1538 }
1539 }
1540 }
1541
1542 if (_speculation_log != NULL) {
1543 if (!is_alive->do_object_b(_speculation_log)) {
1544 bs->write_ref_nmethod_pre(&_speculation_log, this);
1545 _speculation_log = NULL;
1546 bs->write_ref_nmethod_post(&_speculation_log, this);
1547 }
1548 }
1549 return is_unloaded;
1550 }
1551 #endif
1552
1553 // Iterate over metadata calling this function. Used by RedefineClasses
1554 void nmethod::metadata_do(void f(Metadata*)) {
1555 address low_boundary = verified_entry_point();
1556 if (is_not_entrant()) {
1557 low_boundary += NativeJump::instruction_size;
1558 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1559 // (See comment above.)
1560 }
1561 {
1562 // Visit all immediate references that are embedded in the instruction stream.
1563 RelocIterator iter(this, low_boundary);
1564 while (iter.next()) {
1565 if (iter.type() == relocInfo::metadata_type ) {
1566 metadata_Relocation* r = iter.metadata_reloc();
1567 // In this metadata, we must only follow those metadatas directly embedded in
1568 // the code. Other metadatas (oop_index>0) are seen as part of
1569 // the metadata section below.
1570 assert(1 == (r->metadata_is_immediate()) +
1571 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1572 "metadata must be found in exactly one place");
1573 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1574 Metadata* md = r->metadata_value();
1575 if (md != _method) f(md);
1576 }
1577 } else if (iter.type() == relocInfo::virtual_call_type) {
1578 // Check compiledIC holders associated with this nmethod
1579 CompiledIC *ic = CompiledIC_at(&iter);
1580 if (ic->is_icholder_call()) {
1581 CompiledICHolder* cichk = ic->cached_icholder();
1582 f(cichk->holder_method());
1583 f(cichk->holder_klass());
1584 } else {
1585 Metadata* ic_oop = ic->cached_metadata();
1586 if (ic_oop != NULL) {
1587 f(ic_oop);
1588 }
1589 }
1590 }
1591 }
1592 }
1593
1594 // Visit the metadata section
1595 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1596 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1597 Metadata* md = *p;
1598 f(md);
1599 }
1600
1601 // Visit metadata not embedded in the other places.
1602 if (_method != NULL) f(_method);
1603 }
1604
1605 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1606 // make sure the oops ready to receive visitors
1607 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1608 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1609
1610 // If the method is not entrant or zombie then a JMP is plastered over the
1611 // first few bytes. If an oop in the old code was there, that oop
1612 // should not get GC'd. Skip the first few bytes of oops on
1613 // not-entrant methods.
1614 address low_boundary = verified_entry_point();
1615 if (is_not_entrant()) {
1616 low_boundary += NativeJump::instruction_size;
1617 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1618 // (See comment above.)
1619 }
1620
1621 #if INCLUDE_JVMCI
1622 if (_jvmci_installed_code != NULL) {
1623 f->do_oop((oop*) &_jvmci_installed_code);
1624 }
1625 if (_speculation_log != NULL) {
1626 f->do_oop((oop*) &_speculation_log);
1627 }
1628 #endif
1629
1630 RelocIterator iter(this, low_boundary);
1631
1632 while (iter.next()) {
1633 if (iter.type() == relocInfo::oop_type ) {
1634 oop_Relocation* r = iter.oop_reloc();
1635 // In this loop, we must only follow those oops directly embedded in
1636 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1637 assert(1 == (r->oop_is_immediate()) +
1638 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1639 "oop must be found in exactly one place");
1640 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1641 f->do_oop(r->oop_addr());
1642 }
1643 }
1644 }
1645
1646 // Scopes
1647 // This includes oop constants not inlined in the code stream.
1648 for (oop* p = oops_begin(); p < oops_end(); p++) {
1649 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1650 f->do_oop(p);
1651 }
1652 }
1653
1654 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1655
1656 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1657
1658 // An nmethod is "marked" if its _mark_link is set non-null.
1659 // Even if it is the end of the linked list, it will have a non-null link value,
1660 // as long as it is on the list.
1661 // This code must be MP safe, because it is used from parallel GC passes.
1662 bool nmethod::test_set_oops_do_mark() {
1663 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1664 nmethod* observed_mark_link = _oops_do_mark_link;
1665 if (observed_mark_link == NULL) {
1666 // Claim this nmethod for this thread to mark.
1667 observed_mark_link = (nmethod*)
1668 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1669 if (observed_mark_link == NULL) {
1670
1671 // Atomically append this nmethod (now claimed) to the head of the list:
1672 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1673 for (;;) {
1674 nmethod* required_mark_nmethods = observed_mark_nmethods;
1675 _oops_do_mark_link = required_mark_nmethods;
1676 observed_mark_nmethods = (nmethod*)
1677 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1678 if (observed_mark_nmethods == required_mark_nmethods)
1679 break;
1680 }
1681 // Mark was clear when we first saw this guy.
1682 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1683 return false;
1684 }
1685 }
1686 // On fall through, another racing thread marked this nmethod before we did.
1687 return true;
1688 }
1689
1690 void nmethod::oops_do_marking_prologue() {
1691 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1692 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1693 // We use cmpxchg_ptr instead of regular assignment here because the user
1694 // may fork a bunch of threads, and we need them all to see the same state.
1695 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1696 guarantee(observed == NULL, "no races in this sequential code");
1697 }
1698
1699 void nmethod::oops_do_marking_epilogue() {
1700 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1701 nmethod* cur = _oops_do_mark_nmethods;
1702 while (cur != NMETHOD_SENTINEL) {
1703 assert(cur != NULL, "not NULL-terminated");
1704 nmethod* next = cur->_oops_do_mark_link;
1705 cur->_oops_do_mark_link = NULL;
1706 DEBUG_ONLY(cur->verify_oop_relocations());
1707 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1708 cur = next;
1709 }
1710 void* required = _oops_do_mark_nmethods;
1711 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1712 guarantee(observed == required, "no races in this sequential code");
1713 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1714 }
1715
1716 class DetectScavengeRoot: public OopClosure {
1717 bool _detected_scavenge_root;
1718 public:
1719 DetectScavengeRoot() : _detected_scavenge_root(false)
1720 { NOT_PRODUCT(_print_nm = NULL); }
1721 bool detected_scavenge_root() { return _detected_scavenge_root; }
1722 virtual void do_oop(oop* p) {
1723 if ((*p) != NULL && (*p)->is_scavengable()) {
1724 NOT_PRODUCT(maybe_print(p));
1725 _detected_scavenge_root = true;
1726 }
1727 }
1728 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1729
1730 #ifndef PRODUCT
1731 nmethod* _print_nm;
1732 void maybe_print(oop* p) {
1733 if (_print_nm == NULL) return;
1734 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1735 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1736 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1737 p2i(*p), p2i(p));
1738 (*p)->print();
1739 }
1740 #endif //PRODUCT
1741 };
1742
1743 bool nmethod::detect_scavenge_root_oops() {
1744 DetectScavengeRoot detect_scavenge_root;
1745 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1746 oops_do(&detect_scavenge_root);
1747 return detect_scavenge_root.detected_scavenge_root();
1748 }
1749
1750 inline bool includes(void* p, void* from, void* to) {
1751 return from <= p && p < to;
1752 }
1753
1754
1755 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1756 assert(count >= 2, "must be sentinel values, at least");
1757
1758 #ifdef ASSERT
1759 // must be sorted and unique; we do a binary search in find_pc_desc()
1760 int prev_offset = pcs[0].pc_offset();
1761 assert(prev_offset == PcDesc::lower_offset_limit,
1762 "must start with a sentinel");
1763 for (int i = 1; i < count; i++) {
1764 int this_offset = pcs[i].pc_offset();
1765 assert(this_offset > prev_offset, "offsets must be sorted");
1766 prev_offset = this_offset;
1767 }
1768 assert(prev_offset == PcDesc::upper_offset_limit,
1769 "must end with a sentinel");
1770 #endif //ASSERT
1771
1772 // Search for MethodHandle invokes and tag the nmethod.
1773 for (int i = 0; i < count; i++) {
1774 if (pcs[i].is_method_handle_invoke()) {
1775 set_has_method_handle_invokes(true);
1776 break;
1777 }
1778 }
1779 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1780
1781 int size = count * sizeof(PcDesc);
1782 assert(scopes_pcs_size() >= size, "oob");
1783 memcpy(scopes_pcs_begin(), pcs, size);
1784
1785 // Adjust the final sentinel downward.
1786 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1787 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1788 last_pc->set_pc_offset(content_size() + 1);
1789 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1790 // Fill any rounding gaps with copies of the last record.
1791 last_pc[1] = last_pc[0];
1792 }
1793 // The following assert could fail if sizeof(PcDesc) is not
1794 // an integral multiple of oopSize (the rounding term).
1795 // If it fails, change the logic to always allocate a multiple
1796 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1797 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1798 }
1799
1800 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1801 assert(scopes_data_size() >= size, "oob");
1802 memcpy(scopes_data_begin(), buffer, size);
1803 }
1804
1805 #ifdef ASSERT
1806 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1807 PcDesc* lower = search.scopes_pcs_begin();
1808 PcDesc* upper = search.scopes_pcs_end();
1809 lower += 1; // exclude initial sentinel
1810 PcDesc* res = NULL;
1811 for (PcDesc* p = lower; p < upper; p++) {
1812 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1813 if (match_desc(p, pc_offset, approximate)) {
1814 if (res == NULL)
1815 res = p;
1816 else
1817 res = (PcDesc*) badAddress;
1818 }
1819 }
1820 return res;
1821 }
1822 #endif
1823
1824
1825 // Finds a PcDesc with real-pc equal to "pc"
1826 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1827 address base_address = search.code_begin();
1828 if ((pc < base_address) ||
1829 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1830 return NULL; // PC is wildly out of range
1831 }
1832 int pc_offset = (int) (pc - base_address);
1833
1834 // Check the PcDesc cache if it contains the desired PcDesc
1835 // (This as an almost 100% hit rate.)
1836 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1837 if (res != NULL) {
1838 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1839 return res;
1840 }
1841
1842 // Fallback algorithm: quasi-linear search for the PcDesc
1843 // Find the last pc_offset less than the given offset.
1844 // The successor must be the required match, if there is a match at all.
1845 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1846 PcDesc* lower = search.scopes_pcs_begin();
1847 PcDesc* upper = search.scopes_pcs_end();
1848 upper -= 1; // exclude final sentinel
1849 if (lower >= upper) return NULL; // native method; no PcDescs at all
1850
1851 #define assert_LU_OK \
1852 /* invariant on lower..upper during the following search: */ \
1853 assert(lower->pc_offset() < pc_offset, "sanity"); \
1854 assert(upper->pc_offset() >= pc_offset, "sanity")
1855 assert_LU_OK;
1856
1857 // Use the last successful return as a split point.
1858 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1859 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1860 if (mid->pc_offset() < pc_offset) {
1861 lower = mid;
1862 } else {
1863 upper = mid;
1864 }
1865
1866 // Take giant steps at first (4096, then 256, then 16, then 1)
1867 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1868 const int RADIX = (1 << LOG2_RADIX);
1869 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1870 while ((mid = lower + step) < upper) {
1871 assert_LU_OK;
1872 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1873 if (mid->pc_offset() < pc_offset) {
1874 lower = mid;
1875 } else {
1876 upper = mid;
1877 break;
1878 }
1879 }
1880 assert_LU_OK;
1881 }
1882
1883 // Sneak up on the value with a linear search of length ~16.
1884 while (true) {
1885 assert_LU_OK;
1886 mid = lower + 1;
1887 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1888 if (mid->pc_offset() < pc_offset) {
1889 lower = mid;
1890 } else {
1891 upper = mid;
1892 break;
1893 }
1894 }
1895 #undef assert_LU_OK
1896
1897 if (match_desc(upper, pc_offset, approximate)) {
1898 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1899 _pc_desc_cache.add_pc_desc(upper);
1900 return upper;
1901 } else {
1902 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1903 return NULL;
1904 }
1905 }
1906
1907
1908 void nmethod::check_all_dependencies(DepChange& changes) {
1909 // Checked dependencies are allocated into this ResourceMark
1910 ResourceMark rm;
1911
1912 // Turn off dependency tracing while actually testing dependencies.
1913 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1914
1915 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1916 &DependencySignature::equals, 11027> DepTable;
1917
1918 DepTable* table = new DepTable();
1919
1920 // Iterate over live nmethods and check dependencies of all nmethods that are not
1921 // marked for deoptimization. A particular dependency is only checked once.
1922 NMethodIterator iter;
1923 while(iter.next()) {
1924 nmethod* nm = iter.method();
1925 // Only notify for live nmethods
1926 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1927 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1928 // Construct abstraction of a dependency.
1929 DependencySignature* current_sig = new DependencySignature(deps);
1930
1931 // Determine if dependency is already checked. table->put(...) returns
1932 // 'true' if the dependency is added (i.e., was not in the hashtable).
1933 if (table->put(*current_sig, 1)) {
1934 if (deps.check_dependency() != NULL) {
1935 // Dependency checking failed. Print out information about the failed
1936 // dependency and finally fail with an assert. We can fail here, since
1937 // dependency checking is never done in a product build.
1938 tty->print_cr("Failed dependency:");
1939 changes.print();
1940 nm->print();
1941 nm->print_dependencies();
1942 assert(false, "Should have been marked for deoptimization");
1943 }
1944 }
1945 }
1946 }
1947 }
1948 }
1949
1950 bool nmethod::check_dependency_on(DepChange& changes) {
1951 // What has happened:
1952 // 1) a new class dependee has been added
1953 // 2) dependee and all its super classes have been marked
1954 bool found_check = false; // set true if we are upset
1955 for (Dependencies::DepStream deps(this); deps.next(); ) {
1956 // Evaluate only relevant dependencies.
1957 if (deps.spot_check_dependency_at(changes) != NULL) {
1958 found_check = true;
1959 NOT_DEBUG(break);
1960 }
1961 }
1962 return found_check;
1963 }
1964
1965 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1966 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1967 Array<Method*>* dependee_methods = dependee_ik->methods();
1968 for (Dependencies::DepStream deps(this); deps.next(); ) {
1969 if (deps.type() == Dependencies::evol_method) {
1970 Method* method = deps.method_argument(0);
1971 for (int j = 0; j < dependee_methods->length(); j++) {
1972 if (dependee_methods->at(j) == method) {
1973 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1974 ResourceMark rm;
1975 log_debug(redefine, class, nmethod)
1976 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1977 _method->method_holder()->external_name(),
1978 _method->name()->as_C_string(),
1979 _method->signature()->as_C_string(),
1980 compile_id(),
1981 method->method_holder()->external_name(),
1982 method->name()->as_C_string(),
1983 method->signature()->as_C_string());
1984 }
1985 if (TraceDependencies || LogCompilation)
1986 deps.log_dependency(dependee);
1987 return true;
1988 }
1989 }
1990 }
1991 }
1992 return false;
1993 }
1994
1995 // Called from mark_for_deoptimization, when dependee is invalidated.
1996 bool nmethod::is_dependent_on_method(Method* dependee) {
1997 for (Dependencies::DepStream deps(this); deps.next(); ) {
1998 if (deps.type() != Dependencies::evol_method)
1999 continue;
2000 Method* method = deps.method_argument(0);
2001 if (method == dependee) return true;
2002 }
2003 return false;
2004 }
2005
2006
2007 bool nmethod::is_patchable_at(address instr_addr) {
2008 assert(insts_contains(instr_addr), "wrong nmethod used");
2009 if (is_zombie()) {
2010 // a zombie may never be patched
2011 return false;
2012 }
2013 return true;
2014 }
2015
2016
2017 address nmethod::continuation_for_implicit_exception(address pc) {
2018 // Exception happened outside inline-cache check code => we are inside
2019 // an active nmethod => use cpc to determine a return address
2020 int exception_offset = pc - code_begin();
2021 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2022 #ifdef ASSERT
2023 if (cont_offset == 0) {
2024 Thread* thread = Thread::current();
2025 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2026 HandleMark hm(thread);
2027 ResourceMark rm(thread);
2028 CodeBlob* cb = CodeCache::find_blob(pc);
2029 assert(cb != NULL && cb == this, "");
2030 ttyLocker ttyl;
2031 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2032 print();
2033 method()->print_codes();
2034 print_code();
2035 print_pcs();
2036 }
2037 #endif
2038 if (cont_offset == 0) {
2039 // Let the normal error handling report the exception
2040 return NULL;
2041 }
2042 return code_begin() + cont_offset;
2043 }
2044
2045
2046
2047 void nmethod_init() {
2048 // make sure you didn't forget to adjust the filler fields
2049 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2050 }
2051
2052
2053 //-------------------------------------------------------------------------------------------
2054
2055
2056 // QQQ might we make this work from a frame??
2057 nmethodLocker::nmethodLocker(address pc) {
2058 CodeBlob* cb = CodeCache::find_blob(pc);
2059 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2060 _nm = cb->as_compiled_method();
2061 lock_nmethod(_nm);
2062 }
2063
2064 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2065 // should pass zombie_ok == true.
2066 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2067 if (cm == NULL) return;
2068 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2069 nmethod* nm = cm->as_nmethod();
2070 Atomic::inc(&nm->_lock_count);
2071 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2072 }
2073
2074 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2075 if (cm == NULL) return;
2076 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2077 nmethod* nm = cm->as_nmethod();
2078 Atomic::dec(&nm->_lock_count);
2079 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2080 }
2081
2082
2083 // -----------------------------------------------------------------------------
2084 // Verification
2085
2086 class VerifyOopsClosure: public OopClosure {
2087 nmethod* _nm;
2088 bool _ok;
2089 public:
2090 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2091 bool ok() { return _ok; }
2092 virtual void do_oop(oop* p) {
2093 if ((*p) == NULL || (*p)->is_oop()) return;
2094 if (_ok) {
2095 _nm->print_nmethod(true);
2096 _ok = false;
2097 }
2098 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2099 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2100 }
2101 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2102 };
2103
2104 void nmethod::verify() {
2105
2106 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2107 // seems odd.
2108
2109 if (is_zombie() || is_not_entrant() || is_unloaded())
2110 return;
2111
2112 // Make sure all the entry points are correctly aligned for patching.
2113 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2114
2115 // assert(method()->is_oop(), "must be valid");
2116
2117 ResourceMark rm;
2118
2119 if (!CodeCache::contains(this)) {
2120 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2121 }
2122
2123 if(is_native_method() )
2124 return;
2125
2126 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2127 if (nm != this) {
2128 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2129 }
2130
2131 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2132 if (! p->verify(this)) {
2133 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2134 }
2135 }
2136
2137 VerifyOopsClosure voc(this);
2138 oops_do(&voc);
2139 assert(voc.ok(), "embedded oops must be OK");
2140 verify_scavenge_root_oops();
2141
2142 verify_scopes();
2143 }
2144
2145
2146 void nmethod::verify_interrupt_point(address call_site) {
2147 // Verify IC only when nmethod installation is finished.
2148 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2149 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2150 if (is_installed) {
2151 Thread *cur = Thread::current();
2152 if (CompiledIC_lock->owner() == cur ||
2153 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2154 SafepointSynchronize::is_at_safepoint())) {
2155 CompiledIC_at(this, call_site);
2156 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2157 } else {
2158 MutexLocker ml_verify (CompiledIC_lock);
2159 CompiledIC_at(this, call_site);
2160 }
2161 }
2162
2163 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2164 assert(pd != NULL, "PcDesc must exist");
2165 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2166 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2167 pd->return_oop());
2168 !sd->is_top(); sd = sd->sender()) {
2169 sd->verify();
2170 }
2171 }
2172
2173 void nmethod::verify_scopes() {
2174 if( !method() ) return; // Runtime stubs have no scope
2175 if (method()->is_native()) return; // Ignore stub methods.
2176 // iterate through all interrupt point
2177 // and verify the debug information is valid.
2178 RelocIterator iter((nmethod*)this);
2179 while (iter.next()) {
2180 address stub = NULL;
2181 switch (iter.type()) {
2182 case relocInfo::virtual_call_type:
2183 verify_interrupt_point(iter.addr());
2184 break;
2185 case relocInfo::opt_virtual_call_type:
2186 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2187 verify_interrupt_point(iter.addr());
2188 break;
2189 case relocInfo::static_call_type:
2190 stub = iter.static_call_reloc()->static_stub(false);
2191 //verify_interrupt_point(iter.addr());
2192 break;
2193 case relocInfo::runtime_call_type:
2194 case relocInfo::runtime_call_w_cp_type: {
2195 address destination = iter.reloc()->value();
2196 // Right now there is no way to find out which entries support
2197 // an interrupt point. It would be nice if we had this
2198 // information in a table.
2199 break;
2200 }
2201 default:
2202 break;
2203 }
2204 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2205 }
2206 }
2207
2208
2209 // -----------------------------------------------------------------------------
2210 // Non-product code
2211 #ifndef PRODUCT
2212
2213 class DebugScavengeRoot: public OopClosure {
2214 nmethod* _nm;
2215 bool _ok;
2216 public:
2217 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2218 bool ok() { return _ok; }
2219 virtual void do_oop(oop* p) {
2220 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2221 if (_ok) {
2222 _nm->print_nmethod(true);
2223 _ok = false;
2224 }
2225 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2226 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2227 (*p)->print();
2228 }
2229 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2230 };
2231
2232 void nmethod::verify_scavenge_root_oops() {
2233 if (UseG1GC) {
2234 return;
2235 }
2236
2237 if (!on_scavenge_root_list()) {
2238 // Actually look inside, to verify the claim that it's clean.
2239 DebugScavengeRoot debug_scavenge_root(this);
2240 oops_do(&debug_scavenge_root);
2241 if (!debug_scavenge_root.ok())
2242 fatal("found an unadvertised bad scavengable oop in the code cache");
2243 }
2244 assert(scavenge_root_not_marked(), "");
2245 }
2246
2247 #endif // PRODUCT
2248
2249 // Printing operations
2250
2251 void nmethod::print() const {
2252 ResourceMark rm;
2253 ttyLocker ttyl; // keep the following output all in one block
2254
2255 tty->print("Compiled method ");
2256
2257 if (is_compiled_by_c1()) {
2258 tty->print("(c1) ");
2259 } else if (is_compiled_by_c2()) {
2260 tty->print("(c2) ");
2261 } else if (is_compiled_by_shark()) {
2262 tty->print("(shark) ");
2263 } else if (is_compiled_by_jvmci()) {
2264 tty->print("(JVMCI) ");
2265 } else {
2266 tty->print("(nm) ");
2267 }
2268
2269 print_on(tty, NULL);
2270
2271 if (WizardMode) {
2272 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2273 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2274 tty->print(" { ");
2275 tty->print_cr("%s ", state());
2276 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2277 tty->print_cr("}:");
2278 }
2279 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2280 p2i(this),
2281 p2i(this) + size(),
2282 size());
2283 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2284 p2i(relocation_begin()),
2285 p2i(relocation_end()),
2286 relocation_size());
2287 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2288 p2i(consts_begin()),
2289 p2i(consts_end()),
2290 consts_size());
2291 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2292 p2i(insts_begin()),
2293 p2i(insts_end()),
2294 insts_size());
2295 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2296 p2i(stub_begin()),
2297 p2i(stub_end()),
2298 stub_size());
2299 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2300 p2i(oops_begin()),
2301 p2i(oops_end()),
2302 oops_size());
2303 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2304 p2i(metadata_begin()),
2305 p2i(metadata_end()),
2306 metadata_size());
2307 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2308 p2i(scopes_data_begin()),
2309 p2i(scopes_data_end()),
2310 scopes_data_size());
2311 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2312 p2i(scopes_pcs_begin()),
2313 p2i(scopes_pcs_end()),
2314 scopes_pcs_size());
2315 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2316 p2i(dependencies_begin()),
2317 p2i(dependencies_end()),
2318 dependencies_size());
2319 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2320 p2i(handler_table_begin()),
2321 p2i(handler_table_end()),
2322 handler_table_size());
2323 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2324 p2i(nul_chk_table_begin()),
2325 p2i(nul_chk_table_end()),
2326 nul_chk_table_size());
2327 }
2328
2329 #ifndef PRODUCT
2330
2331 void nmethod::print_scopes() {
2332 // Find the first pc desc for all scopes in the code and print it.
2333 ResourceMark rm;
2334 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2335 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2336 continue;
2337
2338 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2339 while (sd != NULL) {
2340 sd->print_on(tty, p);
2341 sd = sd->sender();
2342 }
2343 }
2344 }
2345
2346 void nmethod::print_dependencies() {
2347 ResourceMark rm;
2348 ttyLocker ttyl; // keep the following output all in one block
2349 tty->print_cr("Dependencies:");
2350 for (Dependencies::DepStream deps(this); deps.next(); ) {
2351 deps.print_dependency();
2352 Klass* ctxk = deps.context_type();
2353 if (ctxk != NULL) {
2354 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2355 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2356 }
2357 }
2358 deps.log_dependency(); // put it into the xml log also
2359 }
2360 }
2361
2362
2363 void nmethod::print_relocations() {
2364 ResourceMark m; // in case methods get printed via the debugger
2365 tty->print_cr("relocations:");
2366 RelocIterator iter(this);
2367 iter.print();
2368 }
2369
2370
2371 void nmethod::print_pcs() {
2372 ResourceMark m; // in case methods get printed via debugger
2373 tty->print_cr("pc-bytecode offsets:");
2374 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2375 p->print(this);
2376 }
2377 }
2378
2379 void nmethod::print_recorded_oops() {
2380 tty->print_cr("Recorded oops:");
2381 for (int i = 0; i < oops_count(); i++) {
2382 oop o = oop_at(i);
2383 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2384 if (o == (oop)Universe::non_oop_word()) {
2385 tty->print("non-oop word");
2386 } else {
2387 o->print_value();
2388 }
2389 tty->cr();
2390 }
2391 }
2392
2393 void nmethod::print_recorded_metadata() {
2394 tty->print_cr("Recorded metadata:");
2395 for (int i = 0; i < metadata_count(); i++) {
2396 Metadata* m = metadata_at(i);
2397 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2398 if (m == (Metadata*)Universe::non_oop_word()) {
2399 tty->print("non-metadata word");
2400 } else {
2401 m->print_value_on_maybe_null(tty);
2402 }
2403 tty->cr();
2404 }
2405 }
2406
2407 #endif // PRODUCT
2408
2409 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2410 RelocIterator iter(this, begin, end);
2411 bool have_one = false;
2412 while (iter.next()) {
2413 have_one = true;
2414 switch (iter.type()) {
2415 case relocInfo::none: return "no_reloc";
2416 case relocInfo::oop_type: {
2417 stringStream st;
2418 oop_Relocation* r = iter.oop_reloc();
2419 oop obj = r->oop_value();
2420 st.print("oop(");
2421 if (obj == NULL) st.print("NULL");
2422 else obj->print_value_on(&st);
2423 st.print(")");
2424 return st.as_string();
2425 }
2426 case relocInfo::metadata_type: {
2427 stringStream st;
2428 metadata_Relocation* r = iter.metadata_reloc();
2429 Metadata* obj = r->metadata_value();
2430 st.print("metadata(");
2431 if (obj == NULL) st.print("NULL");
2432 else obj->print_value_on(&st);
2433 st.print(")");
2434 return st.as_string();
2435 }
2436 case relocInfo::runtime_call_type:
2437 case relocInfo::runtime_call_w_cp_type: {
2438 stringStream st;
2439 st.print("runtime_call");
2440 CallRelocation* r = (CallRelocation*)iter.reloc();
2441 address dest = r->destination();
2442 CodeBlob* cb = CodeCache::find_blob(dest);
2443 if (cb != NULL) {
2444 st.print(" %s", cb->name());
2445 } else {
2446 ResourceMark rm;
2447 const int buflen = 1024;
2448 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2449 int offset;
2450 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2451 st.print(" %s", buf);
2452 if (offset != 0) {
2453 st.print("+%d", offset);
2454 }
2455 }
2456 }
2457 return st.as_string();
2458 }
2459 case relocInfo::virtual_call_type: {
2460 stringStream st;
2461 st.print_raw("virtual_call");
2462 virtual_call_Relocation* r = iter.virtual_call_reloc();
2463 Method* m = r->method_value();
2464 if (m != NULL) {
2465 assert(m->is_method(), "");
2466 m->print_short_name(&st);
2467 }
2468 return st.as_string();
2469 }
2470 case relocInfo::opt_virtual_call_type: {
2471 stringStream st;
2472 st.print_raw("optimized virtual_call");
2473 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2474 Method* m = r->method_value();
2475 if (m != NULL) {
2476 assert(m->is_method(), "");
2477 m->print_short_name(&st);
2478 }
2479 return st.as_string();
2480 }
2481 case relocInfo::static_call_type: {
2482 stringStream st;
2483 st.print_raw("static_call");
2484 static_call_Relocation* r = iter.static_call_reloc();
2485 Method* m = r->method_value();
2486 if (m != NULL) {
2487 assert(m->is_method(), "");
2488 m->print_short_name(&st);
2489 }
2490 return st.as_string();
2491 }
2492 case relocInfo::static_stub_type: return "static_stub";
2493 case relocInfo::external_word_type: return "external_word";
2494 case relocInfo::internal_word_type: return "internal_word";
2495 case relocInfo::section_word_type: return "section_word";
2496 case relocInfo::poll_type: return "poll";
2497 case relocInfo::poll_return_type: return "poll_return";
2498 case relocInfo::type_mask: return "type_bit_mask";
2499
2500 default:
2501 break;
2502 }
2503 }
2504 return have_one ? "other" : NULL;
2505 }
2506
2507 // Return a the last scope in (begin..end]
2508 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2509 PcDesc* p = pc_desc_near(begin+1);
2510 if (p != NULL && p->real_pc(this) <= end) {
2511 return new ScopeDesc(this, p->scope_decode_offset(),
2512 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2513 p->return_oop());
2514 }
2515 return NULL;
2516 }
2517
2518 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2519 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2520 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2521 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2522 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2523 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2524
2525 if (has_method_handle_invokes())
2526 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2527
2528 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2529
2530 if (block_begin == entry_point()) {
2531 methodHandle m = method();
2532 if (m.not_null()) {
2533 stream->print(" # ");
2534 m->print_value_on(stream);
2535 stream->cr();
2536 }
2537 if (m.not_null() && !is_osr_method()) {
2538 ResourceMark rm;
2539 int sizeargs = m->size_of_parameters();
2540 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2541 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2542 {
2543 int sig_index = 0;
2544 if (!m->is_static())
2545 sig_bt[sig_index++] = T_OBJECT; // 'this'
2546 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2547 BasicType t = ss.type();
2548 sig_bt[sig_index++] = t;
2549 if (type2size[t] == 2) {
2550 sig_bt[sig_index++] = T_VOID;
2551 } else {
2552 assert(type2size[t] == 1, "size is 1 or 2");
2553 }
2554 }
2555 assert(sig_index == sizeargs, "");
2556 }
2557 const char* spname = "sp"; // make arch-specific?
2558 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2559 int stack_slot_offset = this->frame_size() * wordSize;
2560 int tab1 = 14, tab2 = 24;
2561 int sig_index = 0;
2562 int arg_index = (m->is_static() ? 0 : -1);
2563 bool did_old_sp = false;
2564 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2565 bool at_this = (arg_index == -1);
2566 bool at_old_sp = false;
2567 BasicType t = (at_this ? T_OBJECT : ss.type());
2568 assert(t == sig_bt[sig_index], "sigs in sync");
2569 if (at_this)
2570 stream->print(" # this: ");
2571 else
2572 stream->print(" # parm%d: ", arg_index);
2573 stream->move_to(tab1);
2574 VMReg fst = regs[sig_index].first();
2575 VMReg snd = regs[sig_index].second();
2576 if (fst->is_reg()) {
2577 stream->print("%s", fst->name());
2578 if (snd->is_valid()) {
2579 stream->print(":%s", snd->name());
2580 }
2581 } else if (fst->is_stack()) {
2582 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2583 if (offset == stack_slot_offset) at_old_sp = true;
2584 stream->print("[%s+0x%x]", spname, offset);
2585 } else {
2586 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2587 }
2588 stream->print(" ");
2589 stream->move_to(tab2);
2590 stream->print("= ");
2591 if (at_this) {
2592 m->method_holder()->print_value_on(stream);
2593 } else {
2594 bool did_name = false;
2595 if (!at_this && ss.is_object()) {
2596 Symbol* name = ss.as_symbol_or_null();
2597 if (name != NULL) {
2598 name->print_value_on(stream);
2599 did_name = true;
2600 }
2601 }
2602 if (!did_name)
2603 stream->print("%s", type2name(t));
2604 }
2605 if (at_old_sp) {
2606 stream->print(" (%s of caller)", spname);
2607 did_old_sp = true;
2608 }
2609 stream->cr();
2610 sig_index += type2size[t];
2611 arg_index += 1;
2612 if (!at_this) ss.next();
2613 }
2614 if (!did_old_sp) {
2615 stream->print(" # ");
2616 stream->move_to(tab1);
2617 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2618 stream->print(" (%s of caller)", spname);
2619 stream->cr();
2620 }
2621 }
2622 }
2623 }
2624
2625 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2626 // First, find an oopmap in (begin, end].
2627 // We use the odd half-closed interval so that oop maps and scope descs
2628 // which are tied to the byte after a call are printed with the call itself.
2629 address base = code_begin();
2630 ImmutableOopMapSet* oms = oop_maps();
2631 if (oms != NULL) {
2632 for (int i = 0, imax = oms->count(); i < imax; i++) {
2633 const ImmutableOopMapPair* pair = oms->pair_at(i);
2634 const ImmutableOopMap* om = pair->get_from(oms);
2635 address pc = base + pair->pc_offset();
2636 if (pc > begin) {
2637 if (pc <= end) {
2638 st->move_to(column);
2639 st->print("; ");
2640 om->print_on(st);
2641 }
2642 break;
2643 }
2644 }
2645 }
2646
2647 // Print any debug info present at this pc.
2648 ScopeDesc* sd = scope_desc_in(begin, end);
2649 if (sd != NULL) {
2650 st->move_to(column);
2651 if (sd->bci() == SynchronizationEntryBCI) {
2652 st->print(";*synchronization entry");
2653 } else {
2654 if (sd->method() == NULL) {
2655 st->print("method is NULL");
2656 } else if (sd->method()->is_native()) {
2657 st->print("method is native");
2658 } else {
2659 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2660 st->print(";*%s", Bytecodes::name(bc));
2661 switch (bc) {
2662 case Bytecodes::_invokevirtual:
2663 case Bytecodes::_invokespecial:
2664 case Bytecodes::_invokestatic:
2665 case Bytecodes::_invokeinterface:
2666 {
2667 Bytecode_invoke invoke(sd->method(), sd->bci());
2668 st->print(" ");
2669 if (invoke.name() != NULL)
2670 invoke.name()->print_symbol_on(st);
2671 else
2672 st->print("<UNKNOWN>");
2673 break;
2674 }
2675 case Bytecodes::_getfield:
2676 case Bytecodes::_putfield:
2677 case Bytecodes::_getstatic:
2678 case Bytecodes::_putstatic:
2679 {
2680 Bytecode_field field(sd->method(), sd->bci());
2681 st->print(" ");
2682 if (field.name() != NULL)
2683 field.name()->print_symbol_on(st);
2684 else
2685 st->print("<UNKNOWN>");
2686 }
2687 default:
2688 break;
2689 }
2690 }
2691 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2692 }
2693
2694 // Print all scopes
2695 for (;sd != NULL; sd = sd->sender()) {
2696 st->move_to(column);
2697 st->print("; -");
2698 if (sd->method() == NULL) {
2699 st->print("method is NULL");
2700 } else {
2701 sd->method()->print_short_name(st);
2702 }
2703 int lineno = sd->method()->line_number_from_bci(sd->bci());
2704 if (lineno != -1) {
2705 st->print("@%d (line %d)", sd->bci(), lineno);
2706 } else {
2707 st->print("@%d", sd->bci());
2708 }
2709 st->cr();
2710 }
2711 }
2712
2713 // Print relocation information
2714 const char* str = reloc_string_for(begin, end);
2715 if (str != NULL) {
2716 if (sd != NULL) st->cr();
2717 st->move_to(column);
2718 st->print("; {%s}", str);
2719 }
2720 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2721 if (cont_offset != 0) {
2722 st->move_to(column);
2723 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2724 }
2725
2726 }
2727
2728 class DirectNativeCallWrapper: public NativeCallWrapper {
2729 private:
2730 NativeCall* _call;
2731
2732 public:
2733 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2734
2735 virtual address destination() const { return _call->destination(); }
2736 virtual address instruction_address() const { return _call->instruction_address(); }
2737 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2738 virtual address return_address() const { return _call->return_address(); }
2739
2740 virtual address get_resolve_call_stub(bool is_optimized) const {
2741 if (is_optimized) {
2742 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2743 }
2744 return SharedRuntime::get_resolve_virtual_call_stub();
2745 }
2746
2747 virtual void set_destination_mt_safe(address dest) {
2748 #if INCLUDE_AOT
2749 if (UseAOT) {
2750 CodeBlob* callee = CodeCache::find_blob(dest);
2751 CompiledMethod* cm = callee->as_compiled_method_or_null();
2752 if (cm != NULL && cm->is_far_code()) {
2753 // Temporary fix, see JDK-8143106
2754 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2755 csc->set_to_far(methodHandle(cm->method()), dest);
2756 return;
2757 }
2758 }
2759 #endif
2760 _call->set_destination_mt_safe(dest);
2761 }
2762
2763 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2764 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2765 #if INCLUDE_AOT
2766 if (info.to_aot()) {
2767 csc->set_to_far(method, info.entry());
2768 } else
2769 #endif
2770 {
2771 csc->set_to_interpreted(method, info.entry());
2772 }
2773 }
2774
2775 virtual void verify() const {
2776 // make sure code pattern is actually a call imm32 instruction
2777 _call->verify();
2778 if (os::is_MP()) {
2779 _call->verify_alignment();
2780 }
2781 }
2782
2783 virtual void verify_resolve_call(address dest) const {
2784 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2785 assert(!db->is_adapter_blob(), "must use stub!");
2786 }
2787
2788 virtual bool is_call_to_interpreted(address dest) const {
2789 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2790 return cb->contains(dest);
2791 }
2792
2793 virtual bool is_safe_for_patching() const { return false; }
2794
2795 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2796 return nativeMovConstReg_at(r->cached_value());
2797 }
2798
2799 virtual void *get_data(NativeInstruction* instruction) const {
2800 return (void*)((NativeMovConstReg*) instruction)->data();
2801 }
2802
2803 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2804 ((NativeMovConstReg*) instruction)->set_data(data);
2805 }
2806 };
2807
2808 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2809 return new DirectNativeCallWrapper((NativeCall*) call);
2810 }
2811
2812 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2813 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2814 }
2815
2816 address nmethod::call_instruction_address(address pc) const {
2817 if (NativeCall::is_call_before(pc)) {
2818 NativeCall *ncall = nativeCall_before(pc);
2819 return ncall->instruction_address();
2820 }
2821 return NULL;
2822 }
2823
2824 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2825 return CompiledDirectStaticCall::at(call_site);
2826 }
2827
2828 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2829 return CompiledDirectStaticCall::at(call_site);
2830 }
2831
2832 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2833 return CompiledDirectStaticCall::before(return_addr);
2834 }
2835
2836 #ifndef PRODUCT
2837
2838 void nmethod::print_value_on(outputStream* st) const {
2839 st->print("nmethod");
2840 print_on(st, NULL);
2841 }
2842
2843 void nmethod::print_calls(outputStream* st) {
2844 RelocIterator iter(this);
2845 while (iter.next()) {
2846 switch (iter.type()) {
2847 case relocInfo::virtual_call_type:
2848 case relocInfo::opt_virtual_call_type: {
2849 VerifyMutexLocker mc(CompiledIC_lock);
2850 CompiledIC_at(&iter)->print();
2851 break;
2852 }
2853 case relocInfo::static_call_type:
2854 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2855 CompiledDirectStaticCall::at(iter.reloc())->print();
2856 break;
2857 default:
2858 break;
2859 }
2860 }
2861 }
2862
2863 void nmethod::print_handler_table() {
2864 ExceptionHandlerTable(this).print();
2865 }
2866
2867 void nmethod::print_nul_chk_table() {
2868 ImplicitExceptionTable(this).print(code_begin());
2869 }
2870
2871 void nmethod::print_statistics() {
2872 ttyLocker ttyl;
2873 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2874 native_nmethod_stats.print_native_nmethod_stats();
2875 #ifdef COMPILER1
2876 c1_java_nmethod_stats.print_nmethod_stats("C1");
2877 #endif
2878 #ifdef COMPILER2
2879 c2_java_nmethod_stats.print_nmethod_stats("C2");
2880 #endif
2881 #if INCLUDE_JVMCI
2882 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2883 #endif
2884 #ifdef SHARK
2885 shark_java_nmethod_stats.print_nmethod_stats("Shark");
2886 #endif
2887 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2888 DebugInformationRecorder::print_statistics();
2889 #ifndef PRODUCT
2890 pc_nmethod_stats.print_pc_stats();
2891 #endif
2892 Dependencies::print_statistics();
2893 if (xtty != NULL) xtty->tail("statistics");
2894 }
2895
2896 #endif // !PRODUCT
2897
2898 #if INCLUDE_JVMCI
2899 void nmethod::clear_jvmci_installed_code() {
2900 // write_ref_method_pre/post can only be safely called at a
2901 // safepoint or while holding the CodeCache_lock
2902 assert(CodeCache_lock->is_locked() ||
2903 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2904 if (_jvmci_installed_code != NULL) {
2905 // This must be done carefully to maintain nmethod remembered sets properly
2906 BarrierSet* bs = Universe::heap()->barrier_set();
2907 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2908 _jvmci_installed_code = NULL;
2909 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2910 }
2911 }
2912
2913 void nmethod::maybe_invalidate_installed_code() {
2914 assert(Patching_lock->is_locked() ||
2915 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2916 oop installed_code = jvmci_installed_code();
2917 if (installed_code != NULL) {
2918 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2919 if (nm == NULL || nm != this) {
2920 // The link has been broken or the InstalledCode instance is
2921 // associated with another nmethod so do nothing.
2922 return;
2923 }
2924 if (!is_alive()) {
2925 // Break the link between nmethod and InstalledCode such that the nmethod
2926 // can subsequently be flushed safely. The link must be maintained while
2927 // the method could have live activations since invalidateInstalledCode
2928 // might want to invalidate all existing activations.
2929 InstalledCode::set_address(installed_code, 0);
2930 InstalledCode::set_entryPoint(installed_code, 0);
2931 } else if (is_not_entrant()) {
2932 // Remove the entry point so any invocation will fail but keep
2933 // the address link around that so that existing activations can
2934 // be invalidated.
2935 InstalledCode::set_entryPoint(installed_code, 0);
2936 }
2937 }
2938 }
2939
2940 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2941 if (installedCode() == NULL) {
2942 THROW(vmSymbols::java_lang_NullPointerException());
2943 }
2944 jlong nativeMethod = InstalledCode::address(installedCode);
2945 nmethod* nm = (nmethod*)nativeMethod;
2946 if (nm == NULL) {
2947 // Nothing to do
2948 return;
2949 }
2950
2951 nmethodLocker nml(nm);
2952 #ifdef ASSERT
2953 {
2954 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2955 // This relationship can only be checked safely under a lock
2956 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2957 }
2958 #endif
2959
2960 if (nm->is_alive()) {
2961 // The nmethod state machinery maintains the link between the
2962 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2963 // alive assume there is work to do and deoptimize the nmethod.
2964 nm->mark_for_deoptimization();
2965 VM_Deoptimize op;
2966 VMThread::execute(&op);
2967 }
2968
2969 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2970 // Check that it's still associated with the same nmethod and break
2971 // the link if it is.
2972 if (InstalledCode::address(installedCode) == nativeMethod) {
2973 InstalledCode::set_address(installedCode, 0);
2974 }
2975 }
2976
2977 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2978 if (!this->is_compiled_by_jvmci()) {
2979 return NULL;
2980 }
2981 oop installedCode = this->jvmci_installed_code();
2982 if (installedCode != NULL) {
2983 oop installedCodeName = NULL;
2984 if (installedCode->is_a(InstalledCode::klass())) {
2985 installedCodeName = InstalledCode::name(installedCode);
2986 }
2987 if (installedCodeName != NULL) {
2988 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2989 } else {
2990 jio_snprintf(buf, buflen, "null");
2991 return buf;
2992 }
2993 }
2994 jio_snprintf(buf, buflen, "noInstalledCode");
2995 return buf;
2996 }
2997 #endif