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