1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "asm/assembler.inline.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/compiledMethod.inline.hpp"
31 #include "code/dependencies.hpp"
32 #include "code/nativeInst.hpp"
33 #include "code/nmethod.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/access.inline.hpp"
48 #include "oops/method.inline.hpp"
49 #include "oops/methodData.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiImpl.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/deoptimization.hpp"
55 #include "runtime/flags/flagSetting.hpp"
56 #include "runtime/frame.inline.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/jniHandles.inline.hpp"
59 #include "runtime/orderAccess.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepointVerifiers.hpp"
62 #include "runtime/serviceThread.hpp"
63 #include "runtime/sharedRuntime.hpp"
64 #include "runtime/sweeper.hpp"
65 #include "runtime/vmThread.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/dtrace.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/resourceHash.hpp"
70 #include "utilities/xmlstream.hpp"
71 #if INCLUDE_JVMCI
72 #include "jvmci/jvmciRuntime.hpp"
73 #endif
74
75 #ifdef DTRACE_ENABLED
76
77 // Only bother with this argument setup if dtrace is available
78
79 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
80 { \
81 Method* m = (method); \
82 if (m != NULL) { \
83 Symbol* klass_name = m->klass_name(); \
84 Symbol* name = m->name(); \
85 Symbol* signature = m->signature(); \
86 HOTSPOT_COMPILED_METHOD_UNLOAD( \
87 (char *) klass_name->bytes(), klass_name->utf8_length(), \
88 (char *) name->bytes(), name->utf8_length(), \
89 (char *) signature->bytes(), signature->utf8_length()); \
90 } \
91 }
92
93 #else // ndef DTRACE_ENABLED
94
95 #define DTRACE_METHOD_UNLOAD_PROBE(method)
96
97 #endif
98
99 //---------------------------------------------------------------------------------
100 // NMethod statistics
101 // They are printed under various flags, including:
102 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
103 // (In the latter two cases, they like other stats are printed to the log only.)
104
105 #ifndef PRODUCT
106 // These variables are put into one block to reduce relocations
107 // and make it simpler to print from the debugger.
108 struct java_nmethod_stats_struct {
109 int nmethod_count;
110 int total_size;
111 int relocation_size;
112 int consts_size;
113 int insts_size;
114 int stub_size;
115 int scopes_data_size;
116 int scopes_pcs_size;
117 int dependencies_size;
118 int handler_table_size;
119 int nul_chk_table_size;
120 #if INCLUDE_JVMCI
121 int speculations_size;
122 int jvmci_data_size;
123 #endif
124 int oops_size;
125 int metadata_size;
126
127 void note_nmethod(nmethod* nm) {
128 nmethod_count += 1;
129 total_size += nm->size();
130 relocation_size += nm->relocation_size();
131 consts_size += nm->consts_size();
132 insts_size += nm->insts_size();
133 stub_size += nm->stub_size();
134 oops_size += nm->oops_size();
135 metadata_size += nm->metadata_size();
136 scopes_data_size += nm->scopes_data_size();
137 scopes_pcs_size += nm->scopes_pcs_size();
138 dependencies_size += nm->dependencies_size();
139 handler_table_size += nm->handler_table_size();
140 nul_chk_table_size += nm->nul_chk_table_size();
141 #if INCLUDE_JVMCI
142 speculations_size += nm->speculations_size();
143 jvmci_data_size += nm->jvmci_data_size();
144 #endif
145 }
146 void print_nmethod_stats(const char* name) {
147 if (nmethod_count == 0) return;
148 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
149 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
150 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
151 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
152 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
153 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
154 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
155 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
156 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
157 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
158 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
159 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
160 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
161 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
162 #if INCLUDE_JVMCI
163 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
164 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
165 #endif
166 }
167 };
168
169 struct native_nmethod_stats_struct {
170 int native_nmethod_count;
171 int native_total_size;
172 int native_relocation_size;
173 int native_insts_size;
174 int native_oops_size;
175 int native_metadata_size;
176 void note_native_nmethod(nmethod* nm) {
177 native_nmethod_count += 1;
178 native_total_size += nm->size();
179 native_relocation_size += nm->relocation_size();
180 native_insts_size += nm->insts_size();
181 native_oops_size += nm->oops_size();
182 native_metadata_size += nm->metadata_size();
183 }
184 void print_native_nmethod_stats() {
185 if (native_nmethod_count == 0) return;
186 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
187 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
188 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
189 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
190 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
191 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
192 }
193 };
194
195 struct pc_nmethod_stats_struct {
196 int pc_desc_resets; // number of resets (= number of caches)
197 int pc_desc_queries; // queries to nmethod::find_pc_desc
198 int pc_desc_approx; // number of those which have approximate true
199 int pc_desc_repeats; // number of _pc_descs[0] hits
200 int pc_desc_hits; // number of LRU cache hits
201 int pc_desc_tests; // total number of PcDesc examinations
202 int pc_desc_searches; // total number of quasi-binary search steps
203 int pc_desc_adds; // number of LUR cache insertions
204
205 void print_pc_stats() {
206 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
207 pc_desc_queries,
208 (double)(pc_desc_tests + pc_desc_searches)
209 / pc_desc_queries);
210 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
211 pc_desc_resets,
212 pc_desc_queries, pc_desc_approx,
213 pc_desc_repeats, pc_desc_hits,
214 pc_desc_tests, pc_desc_searches, pc_desc_adds);
215 }
216 };
217
218 #ifdef COMPILER1
219 static java_nmethod_stats_struct c1_java_nmethod_stats;
220 #endif
221 #ifdef COMPILER2
222 static java_nmethod_stats_struct c2_java_nmethod_stats;
223 #endif
224 #if INCLUDE_JVMCI
225 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
226 #endif
227 static java_nmethod_stats_struct unknown_java_nmethod_stats;
228
229 static native_nmethod_stats_struct native_nmethod_stats;
230 static pc_nmethod_stats_struct pc_nmethod_stats;
231
232 static void note_java_nmethod(nmethod* nm) {
233 #ifdef COMPILER1
234 if (nm->is_compiled_by_c1()) {
235 c1_java_nmethod_stats.note_nmethod(nm);
236 } else
237 #endif
238 #ifdef COMPILER2
239 if (nm->is_compiled_by_c2()) {
240 c2_java_nmethod_stats.note_nmethod(nm);
241 } else
242 #endif
243 #if INCLUDE_JVMCI
244 if (nm->is_compiled_by_jvmci()) {
245 jvmci_java_nmethod_stats.note_nmethod(nm);
246 } else
247 #endif
248 {
249 unknown_java_nmethod_stats.note_nmethod(nm);
250 }
251 }
252 #endif // !PRODUCT
253
254 //---------------------------------------------------------------------------------
255
256
257 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
258 assert(pc != NULL, "Must be non null");
259 assert(exception.not_null(), "Must be non null");
260 assert(handler != NULL, "Must be non null");
261
262 _count = 0;
263 _exception_type = exception->klass();
264 _next = NULL;
265 _purge_list_next = NULL;
266
267 add_address_and_handler(pc,handler);
268 }
269
270
271 address ExceptionCache::match(Handle exception, address pc) {
272 assert(pc != NULL,"Must be non null");
273 assert(exception.not_null(),"Must be non null");
274 if (exception->klass() == exception_type()) {
275 return (test_address(pc));
276 }
277
278 return NULL;
279 }
280
281
282 bool ExceptionCache::match_exception_with_space(Handle exception) {
283 assert(exception.not_null(),"Must be non null");
284 if (exception->klass() == exception_type() && count() < cache_size) {
285 return true;
286 }
287 return false;
288 }
289
290
291 address ExceptionCache::test_address(address addr) {
292 int limit = count();
293 for (int i = 0; i < limit; i++) {
294 if (pc_at(i) == addr) {
295 return handler_at(i);
296 }
297 }
298 return NULL;
299 }
300
301
302 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
303 if (test_address(addr) == handler) return true;
304
305 int index = count();
306 if (index < cache_size) {
307 set_pc_at(index, addr);
308 set_handler_at(index, handler);
309 increment_count();
310 return true;
311 }
312 return false;
313 }
314
315 ExceptionCache* ExceptionCache::next() {
316 return Atomic::load(&_next);
317 }
318
319 void ExceptionCache::set_next(ExceptionCache *ec) {
320 Atomic::store(&_next, ec);
321 }
322
323 //-----------------------------------------------------------------------------
324
325
326 // Helper used by both find_pc_desc methods.
327 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
328 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
329 if (!approximate)
330 return pc->pc_offset() == pc_offset;
331 else
332 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
333 }
334
335 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
336 if (initial_pc_desc == NULL) {
337 _pc_descs[0] = NULL; // native method; no PcDescs at all
338 return;
339 }
340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
341 // reset the cache by filling it with benign (non-null) values
342 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
343 for (int i = 0; i < cache_size; i++)
344 _pc_descs[i] = initial_pc_desc;
345 }
346
347 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
349 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
350
351 // Note: one might think that caching the most recently
352 // read value separately would be a win, but one would be
353 // wrong. When many threads are updating it, the cache
354 // line it's in would bounce between caches, negating
355 // any benefit.
356
357 // In order to prevent race conditions do not load cache elements
358 // repeatedly, but use a local copy:
359 PcDesc* res;
360
361 // Step one: Check the most recently added value.
362 res = _pc_descs[0];
363 if (res == NULL) return NULL; // native method; no PcDescs at all
364 if (match_desc(res, pc_offset, approximate)) {
365 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
366 return res;
367 }
368
369 // Step two: Check the rest of the LRU cache.
370 for (int i = 1; i < cache_size; ++i) {
371 res = _pc_descs[i];
372 if (res->pc_offset() < 0) break; // optimization: skip empty cache
373 if (match_desc(res, pc_offset, approximate)) {
374 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
375 return res;
376 }
377 }
378
379 // Report failure.
380 return NULL;
381 }
382
383 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
384 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
385 // Update the LRU cache by shifting pc_desc forward.
386 for (int i = 0; i < cache_size; i++) {
387 PcDesc* next = _pc_descs[i];
388 _pc_descs[i] = pc_desc;
389 pc_desc = next;
390 }
391 }
392
393 // adjust pcs_size so that it is a multiple of both oopSize and
394 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
395 // of oopSize, then 2*sizeof(PcDesc) is)
396 static int adjust_pcs_size(int pcs_size) {
397 int nsize = align_up(pcs_size, oopSize);
398 if ((nsize % sizeof(PcDesc)) != 0) {
399 nsize = pcs_size + sizeof(PcDesc);
400 }
401 assert((nsize % oopSize) == 0, "correct alignment");
402 return nsize;
403 }
404
405
406 int nmethod::total_size() const {
407 return
408 consts_size() +
409 insts_size() +
410 stub_size() +
411 scopes_data_size() +
412 scopes_pcs_size() +
413 handler_table_size() +
414 nul_chk_table_size();
415 }
416
417 address* nmethod::orig_pc_addr(const frame* fr) {
418 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
419 }
420
421 const char* nmethod::compile_kind() const {
422 if (is_osr_method()) return "osr";
423 if (method() != NULL && is_native_method()) return "c2n";
424 return NULL;
425 }
426
427 // Fill in default values for various flag fields
428 void nmethod::init_defaults() {
429 _state = not_installed;
430 _has_flushed_dependencies = 0;
431 _lock_count = 0;
432 _stack_traversal_mark = 0;
433 _load_reported = false; // jvmti state
434 _unload_reported = false;
435 _is_far_code = false; // nmethods are located in CodeCache
436
437 #ifdef ASSERT
438 _oops_are_stale = false;
439 #endif
440
441 _oops_do_mark_link = NULL;
442 _osr_link = NULL;
443 #if INCLUDE_RTM_OPT
444 _rtm_state = NoRTM;
445 #endif
446 }
447
448 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
449 int compile_id,
450 CodeBuffer *code_buffer,
451 int vep_offset,
452 int frame_complete,
453 int frame_size,
454 ByteSize basic_lock_owner_sp_offset,
455 ByteSize basic_lock_sp_offset,
456 OopMapSet* oop_maps) {
457 code_buffer->finalize_oop_references(method);
458 // create nmethod
459 nmethod* nm = NULL;
460 {
461 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
462 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
463
464 CodeOffsets offsets;
465 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
466 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
467 nm = new (native_nmethod_size, CompLevel_none)
468 nmethod(method(), compiler_none, native_nmethod_size,
469 compile_id, &offsets,
470 code_buffer, frame_size,
471 basic_lock_owner_sp_offset,
472 basic_lock_sp_offset,
473 oop_maps);
474 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
475 }
476
477 if (nm != NULL) {
478 // verify nmethod
479 debug_only(nm->verify();) // might block
480
481 nm->log_new_nmethod();
482 }
483 return nm;
484 }
485
486 nmethod* nmethod::new_nmethod(const methodHandle& method,
487 int compile_id,
488 int entry_bci,
489 CodeOffsets* offsets,
490 int orig_pc_offset,
491 DebugInformationRecorder* debug_info,
492 Dependencies* dependencies,
493 CodeBuffer* code_buffer, int frame_size,
494 OopMapSet* oop_maps,
495 ExceptionHandlerTable* handler_table,
496 ImplicitExceptionTable* nul_chk_table,
497 AbstractCompiler* compiler,
498 int comp_level
499 #if INCLUDE_JVMCI
500 , char* speculations,
501 int speculations_len,
502 int nmethod_mirror_index,
503 const char* nmethod_mirror_name,
504 FailedSpeculation** failed_speculations
505 #endif
506 )
507 {
508 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
509 code_buffer->finalize_oop_references(method);
510 // create nmethod
511 nmethod* nm = NULL;
512 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
513 #if INCLUDE_JVMCI
514 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
515 #endif
516 int nmethod_size =
517 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
518 + adjust_pcs_size(debug_info->pcs_size())
519 + align_up((int)dependencies->size_in_bytes(), oopSize)
520 + align_up(handler_table->size_in_bytes() , oopSize)
521 + align_up(nul_chk_table->size_in_bytes() , oopSize)
522 #if INCLUDE_JVMCI
523 + align_up(speculations_len , oopSize)
524 + align_up(jvmci_data_size , oopSize)
525 #endif
526 + align_up(debug_info->data_size() , oopSize);
527
528 nm = new (nmethod_size, comp_level)
529 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
530 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
531 oop_maps,
532 handler_table,
533 nul_chk_table,
534 compiler,
535 comp_level
536 #if INCLUDE_JVMCI
537 , speculations,
538 speculations_len,
539 jvmci_data_size
540 #endif
541 );
542
543 if (nm != NULL) {
544 #if INCLUDE_JVMCI
545 if (compiler->is_jvmci()) {
546 // Initialize the JVMCINMethodData object inlined into nm
547 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
548 }
549 #endif
550 // To make dependency checking during class loading fast, record
551 // the nmethod dependencies in the classes it is dependent on.
552 // This allows the dependency checking code to simply walk the
553 // class hierarchy above the loaded class, checking only nmethods
554 // which are dependent on those classes. The slow way is to
555 // check every nmethod for dependencies which makes it linear in
556 // the number of methods compiled. For applications with a lot
557 // classes the slow way is too slow.
558 for (Dependencies::DepStream deps(nm); deps.next(); ) {
559 if (deps.type() == Dependencies::call_site_target_value) {
560 // CallSite dependencies are managed on per-CallSite instance basis.
561 oop call_site = deps.argument_oop(0);
562 MethodHandles::add_dependent_nmethod(call_site, nm);
563 } else {
564 Klass* klass = deps.context_type();
565 if (klass == NULL) {
566 continue; // ignore things like evol_method
567 }
568 // record this nmethod as dependent on this klass
569 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
570 }
571 }
572 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
573 }
574 }
575 // Do verification and logging outside CodeCache_lock.
576 if (nm != NULL) {
577 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
578 DEBUG_ONLY(nm->verify();)
579 nm->log_new_nmethod();
580 }
581 return nm;
582 }
583
584 // For native wrappers
585 nmethod::nmethod(
586 Method* method,
587 CompilerType type,
588 int nmethod_size,
589 int compile_id,
590 CodeOffsets* offsets,
591 CodeBuffer* code_buffer,
592 int frame_size,
593 ByteSize basic_lock_owner_sp_offset,
594 ByteSize basic_lock_sp_offset,
595 OopMapSet* oop_maps )
596 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
597 _is_unloading_state(0),
598 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
599 _native_basic_lock_sp_offset(basic_lock_sp_offset)
600 {
601 {
602 int scopes_data_offset = 0;
603 int deoptimize_offset = 0;
604 int deoptimize_mh_offset = 0;
605
606 debug_only(NoSafepointVerifier nsv;)
607 assert_locked_or_safepoint(CodeCache_lock);
608
609 init_defaults();
610 _entry_bci = InvocationEntryBci;
611 // We have no exception handler or deopt handler make the
612 // values something that will never match a pc like the nmethod vtable entry
613 _exception_offset = 0;
614 _orig_pc_offset = 0;
615
616 _consts_offset = data_offset();
617 _stub_offset = data_offset();
618 _oops_offset = data_offset();
619 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
620 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
621 _scopes_pcs_offset = scopes_data_offset;
622 _dependencies_offset = _scopes_pcs_offset;
623 _handler_table_offset = _dependencies_offset;
624 _nul_chk_table_offset = _handler_table_offset;
625 #if INCLUDE_JVMCI
626 _speculations_offset = _nul_chk_table_offset;
627 _jvmci_data_offset = _speculations_offset;
628 _nmethod_end_offset = _jvmci_data_offset;
629 #else
630 _nmethod_end_offset = _nul_chk_table_offset;
631 #endif
632 _compile_id = compile_id;
633 _comp_level = CompLevel_none;
634 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
635 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
636 _osr_entry_point = NULL;
637 _exception_cache = NULL;
638 _pc_desc_container.reset_to(NULL);
639 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
640
641 _scopes_data_begin = (address) this + scopes_data_offset;
642 _deopt_handler_begin = (address) this + deoptimize_offset;
643 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
644
645 code_buffer->copy_code_and_locs_to(this);
646 code_buffer->copy_values_to(this);
647
648 clear_unloading_state();
649
650 Universe::heap()->register_nmethod(this);
651 debug_only(Universe::heap()->verify_nmethod(this));
652
653 CodeCache::commit(this);
654 }
655
656 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
657 ttyLocker ttyl; // keep the following output all in one block
658 // This output goes directly to the tty, not the compiler log.
659 // To enable tools to match it up with the compilation activity,
660 // be sure to tag this tty output with the compile ID.
661 if (xtty != NULL) {
662 xtty->begin_head("print_native_nmethod");
663 xtty->method(_method);
664 xtty->stamp();
665 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
666 }
667 // Print the header part, then print the requested information.
668 // This is both handled in decode2(), called via print_code() -> decode()
669 if (PrintNativeNMethods) {
670 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
671 print_code();
672 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
673 #if defined(SUPPORT_DATA_STRUCTS)
674 if (AbstractDisassembler::show_structs()) {
675 if (oop_maps != NULL) {
676 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
677 oop_maps->print_on(tty);
678 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
679 }
680 }
681 #endif
682 } else {
683 print(); // print the header part only.
684 }
685 #if defined(SUPPORT_DATA_STRUCTS)
686 if (AbstractDisassembler::show_structs()) {
687 if (PrintRelocations) {
688 print_relocations();
689 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
690 }
691 }
692 #endif
693 if (xtty != NULL) {
694 xtty->tail("print_native_nmethod");
695 }
696 }
697 }
698
699 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
700 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
701 }
702
703 nmethod::nmethod(
704 Method* method,
705 CompilerType type,
706 int nmethod_size,
707 int compile_id,
708 int entry_bci,
709 CodeOffsets* offsets,
710 int orig_pc_offset,
711 DebugInformationRecorder* debug_info,
712 Dependencies* dependencies,
713 CodeBuffer *code_buffer,
714 int frame_size,
715 OopMapSet* oop_maps,
716 ExceptionHandlerTable* handler_table,
717 ImplicitExceptionTable* nul_chk_table,
718 AbstractCompiler* compiler,
719 int comp_level
720 #if INCLUDE_JVMCI
721 , char* speculations,
722 int speculations_len,
723 int jvmci_data_size
724 #endif
725 )
726 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
727 _is_unloading_state(0),
728 _native_receiver_sp_offset(in_ByteSize(-1)),
729 _native_basic_lock_sp_offset(in_ByteSize(-1))
730 {
731 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
732 {
733 debug_only(NoSafepointVerifier nsv;)
734 assert_locked_or_safepoint(CodeCache_lock);
735
736 _deopt_handler_begin = (address) this;
737 _deopt_mh_handler_begin = (address) this;
738
739 init_defaults();
740 _entry_bci = entry_bci;
741 _compile_id = compile_id;
742 _comp_level = comp_level;
743 _orig_pc_offset = orig_pc_offset;
744 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
745
746 // Section offsets
747 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
748 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
749 set_ctable_begin(header_begin() + _consts_offset);
750
751 #if INCLUDE_JVMCI
752 if (compiler->is_jvmci()) {
753 // JVMCI might not produce any stub sections
754 if (offsets->value(CodeOffsets::Exceptions) != -1) {
755 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
756 } else {
757 _exception_offset = -1;
758 }
759 if (offsets->value(CodeOffsets::Deopt) != -1) {
760 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
761 } else {
762 _deopt_handler_begin = NULL;
763 }
764 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
765 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
766 } else {
767 _deopt_mh_handler_begin = NULL;
768 }
769 } else
770 #endif
771 {
772 // Exception handler and deopt handler are in the stub section
773 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
774 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
775
776 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
777 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
778 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
779 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
780 } else {
781 _deopt_mh_handler_begin = NULL;
782 }
783 }
784 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
785 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
786 } else {
787 _unwind_handler_offset = -1;
788 }
789
790 _oops_offset = data_offset();
791 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
792 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
793
794 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
795 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
796 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
797 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
798 #if INCLUDE_JVMCI
799 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
800 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
801 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
802 #else
803 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
804 #endif
805 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
806 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
807 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
808 _exception_cache = NULL;
809 _scopes_data_begin = (address) this + scopes_data_offset;
810
811 _pc_desc_container.reset_to(scopes_pcs_begin());
812
813 code_buffer->copy_code_and_locs_to(this);
814 // Copy contents of ScopeDescRecorder to nmethod
815 code_buffer->copy_values_to(this);
816 debug_info->copy_to(this);
817 dependencies->copy_to(this);
818 clear_unloading_state();
819
820 Universe::heap()->register_nmethod(this);
821 debug_only(Universe::heap()->verify_nmethod(this));
822
823 CodeCache::commit(this);
824
825 // Copy contents of ExceptionHandlerTable to nmethod
826 handler_table->copy_to(this);
827 nul_chk_table->copy_to(this);
828
829 #if INCLUDE_JVMCI
830 // Copy speculations to nmethod
831 if (speculations_size() != 0) {
832 memcpy(speculations_begin(), speculations, speculations_len);
833 }
834 #endif
835
836 // we use the information of entry points to find out if a method is
837 // static or non static
838 assert(compiler->is_c2() || compiler->is_jvmci() ||
839 _method->is_static() == (entry_point() == _verified_entry_point),
840 " entry points must be same for static methods and vice versa");
841 }
842 }
843
844 // Print a short set of xml attributes to identify this nmethod. The
845 // output should be embedded in some other element.
846 void nmethod::log_identity(xmlStream* log) const {
847 log->print(" compile_id='%d'", compile_id());
848 const char* nm_kind = compile_kind();
849 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
850 log->print(" compiler='%s'", compiler_name());
851 if (TieredCompilation) {
852 log->print(" level='%d'", comp_level());
853 }
854 #if INCLUDE_JVMCI
855 if (jvmci_nmethod_data() != NULL) {
856 const char* jvmci_name = jvmci_nmethod_data()->name();
857 if (jvmci_name != NULL) {
858 log->print(" jvmci_mirror_name='");
859 log->text("%s", jvmci_name);
860 log->print("'");
861 }
862 }
863 #endif
864 }
865
866
867 #define LOG_OFFSET(log, name) \
868 if (p2i(name##_end()) - p2i(name##_begin())) \
869 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
870 p2i(name##_begin()) - p2i(this))
871
872
873 void nmethod::log_new_nmethod() const {
874 if (LogCompilation && xtty != NULL) {
875 ttyLocker ttyl;
876 HandleMark hm;
877 xtty->begin_elem("nmethod");
878 log_identity(xtty);
879 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
880 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
881
882 LOG_OFFSET(xtty, relocation);
883 LOG_OFFSET(xtty, consts);
884 LOG_OFFSET(xtty, insts);
885 LOG_OFFSET(xtty, stub);
886 LOG_OFFSET(xtty, scopes_data);
887 LOG_OFFSET(xtty, scopes_pcs);
888 LOG_OFFSET(xtty, dependencies);
889 LOG_OFFSET(xtty, handler_table);
890 LOG_OFFSET(xtty, nul_chk_table);
891 LOG_OFFSET(xtty, oops);
892 LOG_OFFSET(xtty, metadata);
893
894 xtty->method(method());
895 xtty->stamp();
896 xtty->end_elem();
897 }
898 }
899
900 #undef LOG_OFFSET
901
902
903 // Print out more verbose output usually for a newly created nmethod.
904 void nmethod::print_on(outputStream* st, const char* msg) const {
905 if (st != NULL) {
906 ttyLocker ttyl;
907 if (WizardMode) {
908 CompileTask::print(st, this, msg, /*short_form:*/ true);
909 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
910 } else {
911 CompileTask::print(st, this, msg, /*short_form:*/ false);
912 }
913 }
914 }
915
916 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
917 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
918 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
919 print_nmethod(printnmethods);
920 }
921 }
922
923 void nmethod::print_nmethod(bool printmethod) {
924 ttyLocker ttyl; // keep the following output all in one block
925 if (xtty != NULL) {
926 xtty->begin_head("print_nmethod");
927 log_identity(xtty);
928 xtty->stamp();
929 xtty->end_head();
930 }
931 // Print the header part, then print the requested information.
932 // This is both handled in decode2().
933 if (printmethod) {
934 HandleMark hm;
935 ResourceMark m;
936 if (is_compiled_by_c1()) {
937 tty->cr();
938 tty->print_cr("============================= C1-compiled nmethod ==============================");
939 }
940 if (is_compiled_by_jvmci()) {
941 tty->cr();
942 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
943 }
944 tty->print_cr("----------------------------------- Assembly -----------------------------------");
945 decode2(tty);
946 #if defined(SUPPORT_DATA_STRUCTS)
947 if (AbstractDisassembler::show_structs()) {
948 // Print the oops from the underlying CodeBlob as well.
949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
950 print_oops(tty);
951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
952 print_metadata(tty);
953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
954 print_pcs();
955 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
956 if (oop_maps() != NULL) {
957 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
958 oop_maps()->print_on(tty);
959 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
960 }
961 }
962 #endif
963 } else {
964 print(); // print the header part only.
965 }
966
967 #if defined(SUPPORT_DATA_STRUCTS)
968 if (AbstractDisassembler::show_structs()) {
969 methodHandle mh(Thread::current(), _method);
970 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(mh, "PrintDebugInfo")) {
971 print_scopes();
972 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
973 }
974 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(mh, "PrintRelocations")) {
975 print_relocations();
976 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
977 }
978 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(mh, "PrintDependencies")) {
979 print_dependencies();
980 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
981 }
982 if (printmethod || PrintExceptionHandlers) {
983 print_handler_table();
984 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
985 print_nul_chk_table();
986 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
987 }
988
989 if (printmethod) {
990 print_recorded_oops();
991 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
992 print_recorded_metadata();
993 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
994 }
995 }
996 #endif
997
998 if (xtty != NULL) {
999 xtty->tail("print_nmethod");
1000 }
1001 }
1002
1003
1004 // Promote one word from an assembly-time handle to a live embedded oop.
1005 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1006 if (handle == NULL ||
1007 // As a special case, IC oops are initialized to 1 or -1.
1008 handle == (jobject) Universe::non_oop_word()) {
1009 (*dest) = (oop) handle;
1010 } else {
1011 (*dest) = JNIHandles::resolve_non_null(handle);
1012 }
1013 }
1014
1015
1016 // Have to have the same name because it's called by a template
1017 void nmethod::copy_values(GrowableArray<jobject>* array) {
1018 int length = array->length();
1019 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1020 oop* dest = oops_begin();
1021 for (int index = 0 ; index < length; index++) {
1022 initialize_immediate_oop(&dest[index], array->at(index));
1023 }
1024
1025 // Now we can fix up all the oops in the code. We need to do this
1026 // in the code because the assembler uses jobjects as placeholders.
1027 // The code and relocations have already been initialized by the
1028 // CodeBlob constructor, so it is valid even at this early point to
1029 // iterate over relocations and patch the code.
1030 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1031 }
1032
1033 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1034 int length = array->length();
1035 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1036 Metadata** dest = metadata_begin();
1037 for (int index = 0 ; index < length; index++) {
1038 dest[index] = array->at(index);
1039 }
1040 }
1041
1042 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1043 // re-patch all oop-bearing instructions, just in case some oops moved
1044 RelocIterator iter(this, begin, end);
1045 while (iter.next()) {
1046 if (iter.type() == relocInfo::oop_type) {
1047 oop_Relocation* reloc = iter.oop_reloc();
1048 if (initialize_immediates && reloc->oop_is_immediate()) {
1049 oop* dest = reloc->oop_addr();
1050 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest));
1051 }
1052 // Refresh the oop-related bits of this instruction.
1053 reloc->fix_oop_relocation();
1054 } else if (iter.type() == relocInfo::metadata_type) {
1055 metadata_Relocation* reloc = iter.metadata_reloc();
1056 reloc->fix_metadata_relocation();
1057 }
1058 }
1059 }
1060
1061
1062 void nmethod::verify_clean_inline_caches() {
1063 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1064
1065 ResourceMark rm;
1066 RelocIterator iter(this, oops_reloc_begin());
1067 while(iter.next()) {
1068 switch(iter.type()) {
1069 case relocInfo::virtual_call_type:
1070 case relocInfo::opt_virtual_call_type: {
1071 CompiledIC *ic = CompiledIC_at(&iter);
1072 // Ok, to lookup references to zombies here
1073 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1074 assert(cb != NULL, "destination not in CodeBlob?");
1075 nmethod* nm = cb->as_nmethod_or_null();
1076 if( nm != NULL ) {
1077 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1078 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1079 assert(ic->is_clean(), "IC should be clean");
1080 }
1081 }
1082 break;
1083 }
1084 case relocInfo::static_call_type: {
1085 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1086 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1087 assert(cb != NULL, "destination not in CodeBlob?");
1088 nmethod* nm = cb->as_nmethod_or_null();
1089 if( nm != NULL ) {
1090 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1091 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1092 assert(csc->is_clean(), "IC should be clean");
1093 }
1094 }
1095 break;
1096 }
1097 default:
1098 break;
1099 }
1100 }
1101 }
1102
1103 // This is a private interface with the sweeper.
1104 void nmethod::mark_as_seen_on_stack() {
1105 assert(is_alive(), "Must be an alive method");
1106 // Set the traversal mark to ensure that the sweeper does 2
1107 // cleaning passes before moving to zombie.
1108 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1109 }
1110
1111 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1112 // there are no activations on the stack, not in use by the VM,
1113 // and not in use by the ServiceThread)
1114 bool nmethod::can_convert_to_zombie() {
1115 // Note that this is called when the sweeper has observed the nmethod to be
1116 // not_entrant. However, with concurrent code cache unloading, the state
1117 // might have moved on to unloaded if it is_unloading(), due to racing
1118 // concurrent GC threads.
1119 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1120
1121 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1122 // count can be greater than the stack traversal count before it hits the
1123 // nmethod for the second time.
1124 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1125 // convert it to zombie due to GC unloading interactions. However, if it
1126 // has become unloaded, then it is okay to convert such nmethods to zombie.
1127 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1128 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1129 }
1130
1131 void nmethod::inc_decompile_count() {
1132 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1133 // Could be gated by ProfileTraps, but do not bother...
1134 Method* m = method();
1135 if (m == NULL) return;
1136 MethodData* mdo = m->method_data();
1137 if (mdo == NULL) return;
1138 // There is a benign race here. See comments in methodData.hpp.
1139 mdo->inc_decompile_count();
1140 }
1141
1142 bool nmethod::try_transition(int new_state_int) {
1143 signed char new_state = new_state_int;
1144 #ifdef DEBUG
1145 if (new_state != unloaded) {
1146 assert_lock_strong(CompiledMethod_lock);
1147 }
1148 #endif
1149 for (;;) {
1150 signed char old_state = Atomic::load(&_state);
1151 if (old_state >= new_state) {
1152 // Ensure monotonicity of transitions.
1153 return false;
1154 }
1155 if (Atomic::cmpxchg(&_state, old_state, new_state) == old_state) {
1156 return true;
1157 }
1158 }
1159 }
1160
1161 void nmethod::make_unloaded() {
1162 post_compiled_method_unload();
1163
1164 // This nmethod is being unloaded, make sure that dependencies
1165 // recorded in instanceKlasses get flushed.
1166 // Since this work is being done during a GC, defer deleting dependencies from the
1167 // InstanceKlass.
1168 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1169 "should only be called during gc");
1170 flush_dependencies(/*delete_immediately*/false);
1171
1172 // Break cycle between nmethod & method
1173 LogTarget(Trace, class, unload, nmethod) lt;
1174 if (lt.is_enabled()) {
1175 LogStream ls(lt);
1176 ls.print("making nmethod " INTPTR_FORMAT
1177 " unloadable, Method*(" INTPTR_FORMAT
1178 ") ",
1179 p2i(this), p2i(_method));
1180 ls.cr();
1181 }
1182 // Unlink the osr method, so we do not look this up again
1183 if (is_osr_method()) {
1184 // Invalidate the osr nmethod only once. Note that with concurrent
1185 // code cache unloading, OSR nmethods are invalidated before they
1186 // are made unloaded. Therefore, this becomes a no-op then.
1187 if (is_in_use()) {
1188 invalidate_osr_method();
1189 }
1190 #ifdef ASSERT
1191 if (method() != NULL) {
1192 // Make sure osr nmethod is invalidated, i.e. not on the list
1193 bool found = method()->method_holder()->remove_osr_nmethod(this);
1194 assert(!found, "osr nmethod should have been invalidated");
1195 }
1196 #endif
1197 }
1198
1199 // If _method is already NULL the Method* is about to be unloaded,
1200 // so we don't have to break the cycle. Note that it is possible to
1201 // have the Method* live here, in case we unload the nmethod because
1202 // it is pointing to some oop (other than the Method*) being unloaded.
1203 if (_method != NULL) {
1204 _method->unlink_code(this);
1205 }
1206
1207 // Make the class unloaded - i.e., change state and notify sweeper
1208 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1209 "must be at safepoint");
1210
1211 {
1212 // Clear ICStubs and release any CompiledICHolders.
1213 CompiledICLocker ml(this);
1214 clear_ic_callsites();
1215 }
1216
1217 // Unregister must be done before the state change
1218 {
1219 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1220 Mutex::_no_safepoint_check_flag);
1221 Universe::heap()->unregister_nmethod(this);
1222 }
1223
1224 // Clear the method of this dead nmethod
1225 set_method(NULL);
1226
1227 // Log the unloading.
1228 log_state_change();
1229
1230 // The Method* is gone at this point
1231 assert(_method == NULL, "Tautology");
1232
1233 set_osr_link(NULL);
1234 NMethodSweeper::report_state_change(this);
1235
1236 bool transition_success = try_transition(unloaded);
1237
1238 // It is an important invariant that there exists no race between
1239 // the sweeper and GC thread competing for making the same nmethod
1240 // zombie and unloaded respectively. This is ensured by
1241 // can_convert_to_zombie() returning false for any is_unloading()
1242 // nmethod, informing the sweeper not to step on any GC toes.
1243 assert(transition_success, "Invalid nmethod transition to unloaded");
1244
1245 #if INCLUDE_JVMCI
1246 // Clear the link between this nmethod and a HotSpotNmethod mirror
1247 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1248 if (nmethod_data != NULL) {
1249 nmethod_data->invalidate_nmethod_mirror(this);
1250 nmethod_data->clear_nmethod_mirror(this);
1251 }
1252 #endif
1253 }
1254
1255 void nmethod::invalidate_osr_method() {
1256 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1257 // Remove from list of active nmethods
1258 if (method() != NULL) {
1259 method()->method_holder()->remove_osr_nmethod(this);
1260 }
1261 }
1262
1263 void nmethod::log_state_change() const {
1264 if (LogCompilation) {
1265 if (xtty != NULL) {
1266 ttyLocker ttyl; // keep the following output all in one block
1267 if (_state == unloaded) {
1268 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1269 os::current_thread_id());
1270 } else {
1271 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1272 os::current_thread_id(),
1273 (_state == zombie ? " zombie='1'" : ""));
1274 }
1275 log_identity(xtty);
1276 xtty->stamp();
1277 xtty->end_elem();
1278 }
1279 }
1280
1281 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1282 CompileTask::print_ul(this, state_msg);
1283 if (PrintCompilation && _state != unloaded) {
1284 print_on(tty, state_msg);
1285 }
1286 }
1287
1288 void nmethod::unlink_from_method() {
1289 if (method() != NULL) {
1290 method()->unlink_code(this);
1291 }
1292 }
1293
1294 /**
1295 * Common functionality for both make_not_entrant and make_zombie
1296 */
1297 bool nmethod::make_not_entrant_or_zombie(int state) {
1298 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1299
1300 if (Atomic::load(&_state) >= state) {
1301 // Avoid taking the lock if already in required state.
1302 // This is safe from races because the state is an end-state,
1303 // which the nmethod cannot back out of once entered.
1304 // No need for fencing either.
1305 return false;
1306 }
1307
1308 // Make sure the nmethod is not flushed.
1309 nmethodLocker nml(this);
1310 // This can be called while the system is already at a safepoint which is ok
1311 NoSafepointVerifier nsv;
1312
1313 // during patching, depending on the nmethod state we must notify the GC that
1314 // code has been unloaded, unregistering it. We cannot do this right while
1315 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1316 // would be prone to deadlocks.
1317 // This flag is used to remember whether we need to later lock and unregister.
1318 bool nmethod_needs_unregister = false;
1319
1320 {
1321 // Enter critical section. Does not block for safepoint.
1322 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1323
1324 // This logic is equivalent to the logic below for patching the
1325 // verified entry point of regular methods. We check that the
1326 // nmethod is in use to ensure that it is invalidated only once.
1327 if (is_osr_method() && is_in_use()) {
1328 // this effectively makes the osr nmethod not entrant
1329 invalidate_osr_method();
1330 }
1331
1332 if (Atomic::load(&_state) >= state) {
1333 // another thread already performed this transition so nothing
1334 // to do, but return false to indicate this.
1335 return false;
1336 }
1337
1338 // The caller can be calling the method statically or through an inline
1339 // cache call.
1340 if (!is_osr_method() && !is_not_entrant()) {
1341 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1342 SharedRuntime::get_handle_wrong_method_stub());
1343 }
1344
1345 if (is_in_use() && update_recompile_counts()) {
1346 // It's a true state change, so mark the method as decompiled.
1347 // Do it only for transition from alive.
1348 inc_decompile_count();
1349 }
1350
1351 // If the state is becoming a zombie, signal to unregister the nmethod with
1352 // the heap.
1353 // This nmethod may have already been unloaded during a full GC.
1354 if ((state == zombie) && !is_unloaded()) {
1355 nmethod_needs_unregister = true;
1356 }
1357
1358 // Must happen before state change. Otherwise we have a race condition in
1359 // nmethod::can_convert_to_zombie(). I.e., a method can immediately
1360 // transition its state from 'not_entrant' to 'zombie' without having to wait
1361 // for stack scanning.
1362 if (state == not_entrant) {
1363 mark_as_seen_on_stack();
1364 OrderAccess::storestore(); // _stack_traversal_mark and _state
1365 }
1366
1367 // Change state
1368 if (!try_transition(state)) {
1369 // If the transition fails, it is due to another thread making the nmethod more
1370 // dead. In particular, one thread might be making the nmethod unloaded concurrently.
1371 // If so, having patched in the jump in the verified entry unnecessarily is fine.
1372 // The nmethod is no longer possible to call by Java threads.
1373 // Incrementing the decompile count is also fine as the caller of make_not_entrant()
1374 // had a valid reason to deoptimize the nmethod.
1375 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now
1376 // !is_alive(), and the seen on stack value is only used to convert not_entrant
1377 // nmethods to zombie in can_convert_to_zombie().
1378 return false;
1379 }
1380
1381 // Log the transition once
1382 log_state_change();
1383
1384 // Remove nmethod from method.
1385 unlink_from_method();
1386
1387 } // leave critical region under CompiledMethod_lock
1388
1389 #if INCLUDE_JVMCI
1390 // Invalidate can't occur while holding the Patching lock
1391 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1392 if (nmethod_data != NULL) {
1393 nmethod_data->invalidate_nmethod_mirror(this);
1394 }
1395 #endif
1396
1397 #ifdef ASSERT
1398 if (is_osr_method() && method() != NULL) {
1399 // Make sure osr nmethod is invalidated, i.e. not on the list
1400 bool found = method()->method_holder()->remove_osr_nmethod(this);
1401 assert(!found, "osr nmethod should have been invalidated");
1402 }
1403 #endif
1404
1405 // When the nmethod becomes zombie it is no longer alive so the
1406 // dependencies must be flushed. nmethods in the not_entrant
1407 // state will be flushed later when the transition to zombie
1408 // happens or they get unloaded.
1409 if (state == zombie) {
1410 {
1411 // Flushing dependencies must be done before any possible
1412 // safepoint can sneak in, otherwise the oops used by the
1413 // dependency logic could have become stale.
1414 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1415 if (nmethod_needs_unregister) {
1416 Universe::heap()->unregister_nmethod(this);
1417 }
1418 flush_dependencies(/*delete_immediately*/true);
1419 }
1420
1421 #if INCLUDE_JVMCI
1422 // Now that the nmethod has been unregistered, it's
1423 // safe to clear the HotSpotNmethod mirror oop.
1424 if (nmethod_data != NULL) {
1425 nmethod_data->clear_nmethod_mirror(this);
1426 }
1427 #endif
1428
1429 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1430 // nmethods during the next safepoint (see ICStub::finalize), as well
1431 // as to free up CompiledICHolder resources.
1432 {
1433 CompiledICLocker ml(this);
1434 clear_ic_callsites();
1435 }
1436
1437 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1438 // event and it hasn't already been reported for this nmethod then
1439 // report it now. The event may have been reported earlier if the GC
1440 // marked it for unloading). JvmtiDeferredEventQueue support means
1441 // we no longer go to a safepoint here.
1442 post_compiled_method_unload();
1443
1444 #ifdef ASSERT
1445 // It's no longer safe to access the oops section since zombie
1446 // nmethods aren't scanned for GC.
1447 _oops_are_stale = true;
1448 #endif
1449 // the Method may be reclaimed by class unloading now that the
1450 // nmethod is in zombie state
1451 set_method(NULL);
1452 } else {
1453 assert(state == not_entrant, "other cases may need to be handled differently");
1454 }
1455
1456 if (TraceCreateZombies && state == zombie) {
1457 ResourceMark m;
1458 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");
1459 }
1460
1461 NMethodSweeper::report_state_change(this);
1462 return true;
1463 }
1464
1465 void nmethod::flush() {
1466 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1467 // Note that there are no valid oops in the nmethod anymore.
1468 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1469 "osr nmethod must be unloaded or zombie before flushing");
1470 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1471 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1472 assert_locked_or_safepoint(CodeCache_lock);
1473
1474 // completely deallocate this method
1475 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1476 if (PrintMethodFlushing) {
1477 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1478 "/Free CodeCache:" SIZE_FORMAT "Kb",
1479 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1480 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1481 }
1482
1483 // We need to deallocate any ExceptionCache data.
1484 // Note that we do not need to grab the nmethod lock for this, it
1485 // better be thread safe if we're disposing of it!
1486 ExceptionCache* ec = exception_cache();
1487 set_exception_cache(NULL);
1488 while(ec != NULL) {
1489 ExceptionCache* next = ec->next();
1490 delete ec;
1491 ec = next;
1492 }
1493
1494 Universe::heap()->flush_nmethod(this);
1495 CodeCache::unregister_old_nmethod(this);
1496
1497 CodeBlob::flush();
1498 CodeCache::free(this);
1499 }
1500
1501 oop nmethod::oop_at(int index) const {
1502 if (index == 0) {
1503 return NULL;
1504 }
1505 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1506 }
1507
1508 oop nmethod::oop_at_phantom(int index) const {
1509 if (index == 0) {
1510 return NULL;
1511 }
1512 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1513 }
1514
1515 //
1516 // Notify all classes this nmethod is dependent on that it is no
1517 // longer dependent. This should only be called in two situations.
1518 // First, when a nmethod transitions to a zombie all dependents need
1519 // to be clear. Since zombification happens at a safepoint there's no
1520 // synchronization issues. The second place is a little more tricky.
1521 // During phase 1 of mark sweep class unloading may happen and as a
1522 // result some nmethods may get unloaded. In this case the flushing
1523 // of dependencies must happen during phase 1 since after GC any
1524 // dependencies in the unloaded nmethod won't be updated, so
1525 // traversing the dependency information in unsafe. In that case this
1526 // function is called with a boolean argument and this function only
1527 // notifies instanceKlasses that are reachable
1528
1529 void nmethod::flush_dependencies(bool delete_immediately) {
1530 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1531 assert(called_by_gc != delete_immediately,
1532 "delete_immediately is false if and only if we are called during GC");
1533 if (!has_flushed_dependencies()) {
1534 set_has_flushed_dependencies();
1535 for (Dependencies::DepStream deps(this); deps.next(); ) {
1536 if (deps.type() == Dependencies::call_site_target_value) {
1537 // CallSite dependencies are managed on per-CallSite instance basis.
1538 oop call_site = deps.argument_oop(0);
1539 if (delete_immediately) {
1540 assert_locked_or_safepoint(CodeCache_lock);
1541 MethodHandles::remove_dependent_nmethod(call_site, this);
1542 } else {
1543 MethodHandles::clean_dependency_context(call_site);
1544 }
1545 } else {
1546 Klass* klass = deps.context_type();
1547 if (klass == NULL) {
1548 continue; // ignore things like evol_method
1549 }
1550 // During GC delete_immediately is false, and liveness
1551 // of dependee determines class that needs to be updated.
1552 if (delete_immediately) {
1553 assert_locked_or_safepoint(CodeCache_lock);
1554 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1555 } else if (klass->is_loader_alive()) {
1556 // The GC may clean dependency contexts concurrently and in parallel.
1557 InstanceKlass::cast(klass)->clean_dependency_context();
1558 }
1559 }
1560 }
1561 }
1562 }
1563
1564 // ------------------------------------------------------------------
1565 // post_compiled_method_load_event
1566 // new method for install_code() path
1567 // Transfer information from compilation to jvmti
1568 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
1569
1570 // Don't post this nmethod load event if it is already dying
1571 // because the sweeper might already be deleting this nmethod.
1572 if (is_not_entrant() && can_convert_to_zombie()) {
1573 return;
1574 }
1575
1576 // This is a bad time for a safepoint. We don't want
1577 // this nmethod to get unloaded while we're queueing the event.
1578 NoSafepointVerifier nsv;
1579
1580 Method* m = method();
1581 HOTSPOT_COMPILED_METHOD_LOAD(
1582 (char *) m->klass_name()->bytes(),
1583 m->klass_name()->utf8_length(),
1584 (char *) m->name()->bytes(),
1585 m->name()->utf8_length(),
1586 (char *) m->signature()->bytes(),
1587 m->signature()->utf8_length(),
1588 insts_begin(), insts_size());
1589
1590
1591 if (JvmtiExport::should_post_compiled_method_load()) {
1592 // Only post unload events if load events are found.
1593 set_load_reported();
1594 // If a JavaThread hasn't been passed in, let the Service thread
1595 // (which is a real Java thread) post the event
1596 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
1597 if (state == NULL) {
1598 // Execute any barrier code for this nmethod as if it's called, since
1599 // keeping it alive looks like stack walking.
1600 run_nmethod_entry_barrier();
1601 ServiceThread::enqueue_deferred_event(&event);
1602 } else {
1603 // This enters the nmethod barrier outside in the caller.
1604 state->enqueue_event(&event);
1605 }
1606 }
1607 }
1608
1609 void nmethod::post_compiled_method_unload() {
1610 if (unload_reported()) {
1611 // During unloading we transition to unloaded and then to zombie
1612 // and the unloading is reported during the first transition.
1613 return;
1614 }
1615
1616 assert(_method != NULL && !is_unloaded(), "just checking");
1617 DTRACE_METHOD_UNLOAD_PROBE(method());
1618
1619 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1620 // post the event. Sometime later this nmethod will be made a zombie
1621 // by the sweeper but the Method* will not be valid at that point.
1622 // The jmethodID is a weak reference to the Method* so if
1623 // it's being unloaded there's no way to look it up since the weak
1624 // ref will have been cleared.
1625
1626 // Don't bother posting the unload if the load event wasn't posted.
1627 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
1628 assert(!unload_reported(), "already unloaded");
1629 JvmtiDeferredEvent event =
1630 JvmtiDeferredEvent::compiled_method_unload_event(
1631 method()->jmethod_id(), insts_begin());
1632 ServiceThread::enqueue_deferred_event(&event);
1633 }
1634
1635 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1636 // any time. As the nmethod is being unloaded now we mark it has
1637 // having the unload event reported - this will ensure that we don't
1638 // attempt to report the event in the unlikely scenario where the
1639 // event is enabled at the time the nmethod is made a zombie.
1640 set_unload_reported();
1641 }
1642
1643 // Iterate over metadata calling this function. Used by RedefineClasses
1644 void nmethod::metadata_do(MetadataClosure* f) {
1645 {
1646 // Visit all immediate references that are embedded in the instruction stream.
1647 RelocIterator iter(this, oops_reloc_begin());
1648 while (iter.next()) {
1649 if (iter.type() == relocInfo::metadata_type) {
1650 metadata_Relocation* r = iter.metadata_reloc();
1651 // In this metadata, we must only follow those metadatas directly embedded in
1652 // the code. Other metadatas (oop_index>0) are seen as part of
1653 // the metadata section below.
1654 assert(1 == (r->metadata_is_immediate()) +
1655 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1656 "metadata must be found in exactly one place");
1657 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1658 Metadata* md = r->metadata_value();
1659 if (md != _method) f->do_metadata(md);
1660 }
1661 } else if (iter.type() == relocInfo::virtual_call_type) {
1662 // Check compiledIC holders associated with this nmethod
1663 ResourceMark rm;
1664 CompiledIC *ic = CompiledIC_at(&iter);
1665 if (ic->is_icholder_call()) {
1666 CompiledICHolder* cichk = ic->cached_icholder();
1667 f->do_metadata(cichk->holder_metadata());
1668 f->do_metadata(cichk->holder_klass());
1669 } else {
1670 Metadata* ic_oop = ic->cached_metadata();
1671 if (ic_oop != NULL) {
1672 f->do_metadata(ic_oop);
1673 }
1674 }
1675 }
1676 }
1677 }
1678
1679 // Visit the metadata section
1680 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1681 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1682 Metadata* md = *p;
1683 f->do_metadata(md);
1684 }
1685
1686 // Visit metadata not embedded in the other places.
1687 if (_method != NULL) f->do_metadata(_method);
1688 }
1689
1690 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1691 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1692 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1693 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1694 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1695
1696 class IsUnloadingState: public AllStatic {
1697 static const uint8_t _is_unloading_mask = 1;
1698 static const uint8_t _is_unloading_shift = 0;
1699 static const uint8_t _unloading_cycle_mask = 6;
1700 static const uint8_t _unloading_cycle_shift = 1;
1701
1702 static uint8_t set_is_unloading(uint8_t state, bool value) {
1703 state &= ~_is_unloading_mask;
1704 if (value) {
1705 state |= 1 << _is_unloading_shift;
1706 }
1707 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1708 return state;
1709 }
1710
1711 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1712 state &= ~_unloading_cycle_mask;
1713 state |= value << _unloading_cycle_shift;
1714 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1715 return state;
1716 }
1717
1718 public:
1719 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1720 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1721
1722 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1723 uint8_t state = 0;
1724 state = set_is_unloading(state, is_unloading);
1725 state = set_unloading_cycle(state, unloading_cycle);
1726 return state;
1727 }
1728 };
1729
1730 bool nmethod::is_unloading() {
1731 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1732 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1733 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1734 if (state_is_unloading) {
1735 return true;
1736 }
1737 uint8_t current_cycle = CodeCache::unloading_cycle();
1738 if (state_unloading_cycle == current_cycle) {
1739 return false;
1740 }
1741
1742 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1743 // oops in the CompiledMethod, by calling oops_do on it.
1744 state_unloading_cycle = current_cycle;
1745
1746 if (is_zombie()) {
1747 // Zombies without calculated unloading epoch are never unloading due to GC.
1748
1749 // There are no races where a previously observed is_unloading() nmethod
1750 // suddenly becomes not is_unloading() due to here being observed as zombie.
1751
1752 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1753 // and unloaded in the safepoint. That makes races where an nmethod is first
1754 // observed as is_alive() && is_unloading() and subsequently observed as
1755 // is_zombie() impossible.
1756
1757 // With concurrent unloading, all references to is_unloading() nmethods are
1758 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1759 // handshake operation is performed with all JavaThreads before finally
1760 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1761 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1762 // the global handshake, it is impossible for is_unloading() nmethods to
1763 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1764 // nmethods before taking that global handshake, meaning that it will never
1765 // be recalculated after the handshake.
1766
1767 // After that global handshake, is_unloading() nmethods are only observable
1768 // to the iterators, and they will never trigger recomputation of the cached
1769 // is_unloading_state, and hence may not suffer from such races.
1770
1771 state_is_unloading = false;
1772 } else {
1773 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1774 }
1775
1776 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1777
1778 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1779
1780 return state_is_unloading;
1781 }
1782
1783 void nmethod::clear_unloading_state() {
1784 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1785 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1786 }
1787
1788
1789 // This is called at the end of the strong tracing/marking phase of a
1790 // GC to unload an nmethod if it contains otherwise unreachable
1791 // oops.
1792
1793 void nmethod::do_unloading(bool unloading_occurred) {
1794 // Make sure the oop's ready to receive visitors
1795 assert(!is_zombie() && !is_unloaded(),
1796 "should not call follow on zombie or unloaded nmethod");
1797
1798 if (is_unloading()) {
1799 make_unloaded();
1800 } else {
1801 guarantee(unload_nmethod_caches(unloading_occurred),
1802 "Should not need transition stubs");
1803 }
1804 }
1805
1806 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1807 // make sure the oops ready to receive visitors
1808 assert(allow_dead || is_alive(), "should not call follow on dead nmethod");
1809
1810 // Prevent extra code cache walk for platforms that don't have immediate oops.
1811 if (relocInfo::mustIterateImmediateOopsInCode()) {
1812 RelocIterator iter(this, oops_reloc_begin());
1813
1814 while (iter.next()) {
1815 if (iter.type() == relocInfo::oop_type ) {
1816 oop_Relocation* r = iter.oop_reloc();
1817 // In this loop, we must only follow those oops directly embedded in
1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1819 assert(1 == (r->oop_is_immediate()) +
1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1821 "oop must be found in exactly one place");
1822 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1823 f->do_oop(r->oop_addr());
1824 }
1825 }
1826 }
1827 }
1828
1829 // Scopes
1830 // This includes oop constants not inlined in the code stream.
1831 for (oop* p = oops_begin(); p < oops_end(); p++) {
1832 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1833 f->do_oop(p);
1834 }
1835 }
1836
1837 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1838
1839 void nmethod::oops_do_log_change(const char* state) {
1840 LogTarget(Trace, gc, nmethod) lt;
1841 if (lt.is_enabled()) {
1842 LogStream ls(lt);
1843 CompileTask::print(&ls, this, state, true /* short_form */);
1844 }
1845 }
1846
1847 bool nmethod::oops_do_try_claim() {
1848 if (oops_do_try_claim_weak_request()) {
1849 nmethod* result = oops_do_try_add_to_list_as_weak_done();
1850 assert(result == NULL, "adding to global list as weak done must always succeed.");
1851 return true;
1852 }
1853 return false;
1854 }
1855
1856 bool nmethod::oops_do_try_claim_weak_request() {
1857 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1858
1859 if ((_oops_do_mark_link == NULL) &&
1860 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
1861 oops_do_log_change("oops_do, mark weak request");
1862 return true;
1863 }
1864 return false;
1865 }
1866
1867 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
1868 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
1869 }
1870
1871 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
1872 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1873
1874 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(NULL, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
1875 if (old_next == NULL) {
1876 oops_do_log_change("oops_do, mark strong done");
1877 }
1878 return old_next;
1879 }
1880
1881 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
1882 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1883 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
1884
1885 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
1886 if (old_next == next) {
1887 oops_do_log_change("oops_do, mark strong request");
1888 }
1889 return old_next;
1890 }
1891
1892 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1893 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1894 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1895
1896 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
1897 if (old_next == next) {
1898 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1899 return true;
1900 }
1901 return false;
1902 }
1903
1904 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1905 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1906
1907 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1908 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1909 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1910
1911 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1912 // Self-loop if needed.
1913 if (old_head == NULL) {
1914 old_head = this;
1915 }
1916 // Try to install end of list and weak done tag.
1917 if (Atomic::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
1918 oops_do_log_change("oops_do, mark weak done");
1919 return NULL;
1920 } else {
1921 return old_head;
1922 }
1923 }
1924
1925 void nmethod::oops_do_add_to_list_as_strong_done() {
1926 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1927
1928 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1929 // Self-loop if needed.
1930 if (old_head == NULL) {
1931 old_head = this;
1932 }
1933 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1934 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1935
1936 oops_do_set_strong_done(old_head);
1937 }
1938
1939 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1940 if (!oops_do_try_claim_weak_request()) {
1941 // Failed to claim for weak processing.
1942 oops_do_log_change("oops_do, mark weak request fail");
1943 return;
1944 }
1945
1946 p->do_regular_processing(this);
1947
1948 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
1949 if (old_head == NULL) {
1950 return;
1951 }
1952 oops_do_log_change("oops_do, mark weak done fail");
1953 // Adding to global list failed, another thread added a strong request.
1954 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1955 "must be but is %u", extract_state(_oops_do_mark_link));
1956
1957 oops_do_log_change("oops_do, mark weak request -> mark strong done");
1958
1959 oops_do_set_strong_done(old_head);
1960 // Do missing strong processing.
1961 p->do_remaining_strong_processing(this);
1962 }
1963
1964 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
1965 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
1966 if (next_raw == NULL) {
1967 p->do_regular_processing(this);
1968 oops_do_add_to_list_as_strong_done();
1969 return;
1970 }
1971 // Claim failed. Figure out why and handle it.
1972 if (oops_do_has_weak_request(next_raw)) {
1973 oops_do_mark_link* old = next_raw;
1974 // Claim failed because being weak processed (state == "weak request").
1975 // Try to request deferred strong processing.
1976 next_raw = oops_do_try_add_strong_request(old);
1977 if (next_raw == old) {
1978 // Successfully requested deferred strong processing.
1979 return;
1980 }
1981 // Failed because of a concurrent transition. No longer in "weak request" state.
1982 }
1983 if (oops_do_has_any_strong_state(next_raw)) {
1984 // Already claimed for strong processing or requested for such.
1985 return;
1986 }
1987 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
1988 // Successfully claimed "weak done" as "strong done". Do the missing marking.
1989 p->do_remaining_strong_processing(this);
1990 return;
1991 }
1992 // Claim failed, some other thread got it.
1993 }
1994
1995 void nmethod::oops_do_marking_prologue() {
1996 assert_at_safepoint();
1997
1998 log_trace(gc, nmethod)("oops_do_marking_prologue");
1999 assert(_oops_do_mark_nmethods == NULL, "must be empty");
2000 }
2001
2002 void nmethod::oops_do_marking_epilogue() {
2003 assert_at_safepoint();
2004
2005 nmethod* next = _oops_do_mark_nmethods;
2006 _oops_do_mark_nmethods = NULL;
2007 if (next != NULL) {
2008 nmethod* cur;
2009 do {
2010 cur = next;
2011 next = extract_nmethod(cur->_oops_do_mark_link);
2012 cur->_oops_do_mark_link = NULL;
2013 DEBUG_ONLY(cur->verify_oop_relocations());
2014
2015 LogTarget(Trace, gc, nmethod) lt;
2016 if (lt.is_enabled()) {
2017 LogStream ls(lt);
2018 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2019 }
2020 // End if self-loop has been detected.
2021 } while (cur != next);
2022 }
2023 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2024 }
2025
2026 inline bool includes(void* p, void* from, void* to) {
2027 return from <= p && p < to;
2028 }
2029
2030
2031 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2032 assert(count >= 2, "must be sentinel values, at least");
2033
2034 #ifdef ASSERT
2035 // must be sorted and unique; we do a binary search in find_pc_desc()
2036 int prev_offset = pcs[0].pc_offset();
2037 assert(prev_offset == PcDesc::lower_offset_limit,
2038 "must start with a sentinel");
2039 for (int i = 1; i < count; i++) {
2040 int this_offset = pcs[i].pc_offset();
2041 assert(this_offset > prev_offset, "offsets must be sorted");
2042 prev_offset = this_offset;
2043 }
2044 assert(prev_offset == PcDesc::upper_offset_limit,
2045 "must end with a sentinel");
2046 #endif //ASSERT
2047
2048 // Search for MethodHandle invokes and tag the nmethod.
2049 for (int i = 0; i < count; i++) {
2050 if (pcs[i].is_method_handle_invoke()) {
2051 set_has_method_handle_invokes(true);
2052 break;
2053 }
2054 }
2055 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
2056
2057 int size = count * sizeof(PcDesc);
2058 assert(scopes_pcs_size() >= size, "oob");
2059 memcpy(scopes_pcs_begin(), pcs, size);
2060
2061 // Adjust the final sentinel downward.
2062 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2063 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2064 last_pc->set_pc_offset(content_size() + 1);
2065 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2066 // Fill any rounding gaps with copies of the last record.
2067 last_pc[1] = last_pc[0];
2068 }
2069 // The following assert could fail if sizeof(PcDesc) is not
2070 // an integral multiple of oopSize (the rounding term).
2071 // If it fails, change the logic to always allocate a multiple
2072 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2073 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2074 }
2075
2076 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2077 assert(scopes_data_size() >= size, "oob");
2078 memcpy(scopes_data_begin(), buffer, size);
2079 }
2080
2081 #ifdef ASSERT
2082 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
2083 PcDesc* lower = search.scopes_pcs_begin();
2084 PcDesc* upper = search.scopes_pcs_end();
2085 lower += 1; // exclude initial sentinel
2086 PcDesc* res = NULL;
2087 for (PcDesc* p = lower; p < upper; p++) {
2088 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2089 if (match_desc(p, pc_offset, approximate)) {
2090 if (res == NULL)
2091 res = p;
2092 else
2093 res = (PcDesc*) badAddress;
2094 }
2095 }
2096 return res;
2097 }
2098 #endif
2099
2100
2101 // Finds a PcDesc with real-pc equal to "pc"
2102 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
2103 address base_address = search.code_begin();
2104 if ((pc < base_address) ||
2105 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2106 return NULL; // PC is wildly out of range
2107 }
2108 int pc_offset = (int) (pc - base_address);
2109
2110 // Check the PcDesc cache if it contains the desired PcDesc
2111 // (This as an almost 100% hit rate.)
2112 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2113 if (res != NULL) {
2114 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
2115 return res;
2116 }
2117
2118 // Fallback algorithm: quasi-linear search for the PcDesc
2119 // Find the last pc_offset less than the given offset.
2120 // The successor must be the required match, if there is a match at all.
2121 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2122 PcDesc* lower = search.scopes_pcs_begin();
2123 PcDesc* upper = search.scopes_pcs_end();
2124 upper -= 1; // exclude final sentinel
2125 if (lower >= upper) return NULL; // native method; no PcDescs at all
2126
2127 #define assert_LU_OK \
2128 /* invariant on lower..upper during the following search: */ \
2129 assert(lower->pc_offset() < pc_offset, "sanity"); \
2130 assert(upper->pc_offset() >= pc_offset, "sanity")
2131 assert_LU_OK;
2132
2133 // Use the last successful return as a split point.
2134 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2135 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2136 if (mid->pc_offset() < pc_offset) {
2137 lower = mid;
2138 } else {
2139 upper = mid;
2140 }
2141
2142 // Take giant steps at first (4096, then 256, then 16, then 1)
2143 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2144 const int RADIX = (1 << LOG2_RADIX);
2145 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2146 while ((mid = lower + step) < upper) {
2147 assert_LU_OK;
2148 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2149 if (mid->pc_offset() < pc_offset) {
2150 lower = mid;
2151 } else {
2152 upper = mid;
2153 break;
2154 }
2155 }
2156 assert_LU_OK;
2157 }
2158
2159 // Sneak up on the value with a linear search of length ~16.
2160 while (true) {
2161 assert_LU_OK;
2162 mid = lower + 1;
2163 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2164 if (mid->pc_offset() < pc_offset) {
2165 lower = mid;
2166 } else {
2167 upper = mid;
2168 break;
2169 }
2170 }
2171 #undef assert_LU_OK
2172
2173 if (match_desc(upper, pc_offset, approximate)) {
2174 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2175 _pc_desc_cache.add_pc_desc(upper);
2176 return upper;
2177 } else {
2178 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2179 return NULL;
2180 }
2181 }
2182
2183
2184 void nmethod::check_all_dependencies(DepChange& changes) {
2185 // Checked dependencies are allocated into this ResourceMark
2186 ResourceMark rm;
2187
2188 // Turn off dependency tracing while actually testing dependencies.
2189 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2190
2191 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2192 &DependencySignature::equals, 11027> DepTable;
2193
2194 DepTable* table = new DepTable();
2195
2196 // Iterate over live nmethods and check dependencies of all nmethods that are not
2197 // marked for deoptimization. A particular dependency is only checked once.
2198 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2199 while(iter.next()) {
2200 nmethod* nm = iter.method();
2201 // Only notify for live nmethods
2202 if (!nm->is_marked_for_deoptimization()) {
2203 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2204 // Construct abstraction of a dependency.
2205 DependencySignature* current_sig = new DependencySignature(deps);
2206
2207 // Determine if dependency is already checked. table->put(...) returns
2208 // 'true' if the dependency is added (i.e., was not in the hashtable).
2209 if (table->put(*current_sig, 1)) {
2210 if (deps.check_dependency() != NULL) {
2211 // Dependency checking failed. Print out information about the failed
2212 // dependency and finally fail with an assert. We can fail here, since
2213 // dependency checking is never done in a product build.
2214 tty->print_cr("Failed dependency:");
2215 changes.print();
2216 nm->print();
2217 nm->print_dependencies();
2218 assert(false, "Should have been marked for deoptimization");
2219 }
2220 }
2221 }
2222 }
2223 }
2224 }
2225
2226 bool nmethod::check_dependency_on(DepChange& changes) {
2227 // What has happened:
2228 // 1) a new class dependee has been added
2229 // 2) dependee and all its super classes have been marked
2230 bool found_check = false; // set true if we are upset
2231 for (Dependencies::DepStream deps(this); deps.next(); ) {
2232 // Evaluate only relevant dependencies.
2233 if (deps.spot_check_dependency_at(changes) != NULL) {
2234 found_check = true;
2235 NOT_DEBUG(break);
2236 }
2237 }
2238 return found_check;
2239 }
2240
2241 // Called from mark_for_deoptimization, when dependee is invalidated.
2242 bool nmethod::is_dependent_on_method(Method* dependee) {
2243 for (Dependencies::DepStream deps(this); deps.next(); ) {
2244 if (deps.type() != Dependencies::evol_method)
2245 continue;
2246 Method* method = deps.method_argument(0);
2247 if (method == dependee) return true;
2248 }
2249 return false;
2250 }
2251
2252
2253 bool nmethod::is_patchable_at(address instr_addr) {
2254 assert(insts_contains(instr_addr), "wrong nmethod used");
2255 if (is_zombie()) {
2256 // a zombie may never be patched
2257 return false;
2258 }
2259 return true;
2260 }
2261
2262
2263 void nmethod_init() {
2264 // make sure you didn't forget to adjust the filler fields
2265 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2266 }
2267
2268
2269 //-------------------------------------------------------------------------------------------
2270
2271
2272 // QQQ might we make this work from a frame??
2273 nmethodLocker::nmethodLocker(address pc) {
2274 CodeBlob* cb = CodeCache::find_blob(pc);
2275 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2276 _nm = cb->as_compiled_method();
2277 lock_nmethod(_nm);
2278 }
2279
2280 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2281 // should pass zombie_ok == true.
2282 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2283 if (cm == NULL) return;
2284 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2285 nmethod* nm = cm->as_nmethod();
2286 Atomic::inc(&nm->_lock_count);
2287 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2288 }
2289
2290 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2291 if (cm == NULL) return;
2292 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2293 nmethod* nm = cm->as_nmethod();
2294 Atomic::dec(&nm->_lock_count);
2295 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2296 }
2297
2298
2299 // -----------------------------------------------------------------------------
2300 // Verification
2301
2302 class VerifyOopsClosure: public OopClosure {
2303 nmethod* _nm;
2304 bool _ok;
2305 public:
2306 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2307 bool ok() { return _ok; }
2308 virtual void do_oop(oop* p) {
2309 if (oopDesc::is_oop_or_null(*p)) return;
2310 // Print diagnostic information before calling print_nmethod().
2311 // Assertions therein might prevent call from returning.
2312 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2313 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2314 if (_ok) {
2315 _nm->print_nmethod(true);
2316 _ok = false;
2317 }
2318 }
2319 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2320 };
2321
2322 class VerifyMetadataClosure: public MetadataClosure {
2323 public:
2324 void do_metadata(Metadata* md) {
2325 if (md->is_method()) {
2326 Method* method = (Method*)md;
2327 assert(!method->is_old(), "Should not be installing old methods");
2328 }
2329 }
2330 };
2331
2332
2333 void nmethod::verify() {
2334
2335 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2336 // seems odd.
2337
2338 if (is_zombie() || is_not_entrant() || is_unloaded())
2339 return;
2340
2341 // Make sure all the entry points are correctly aligned for patching.
2342 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2343
2344 // assert(oopDesc::is_oop(method()), "must be valid");
2345
2346 ResourceMark rm;
2347
2348 if (!CodeCache::contains(this)) {
2349 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2350 }
2351
2352 if(is_native_method() )
2353 return;
2354
2355 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2356 if (nm != this) {
2357 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2358 }
2359
2360 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2361 if (! p->verify(this)) {
2362 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2363 }
2364 }
2365
2366 #ifdef ASSERT
2367 #if INCLUDE_JVMCI
2368 {
2369 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2370 ImmutableOopMapSet* oms = oop_maps();
2371 ImplicitExceptionTable implicit_table(this);
2372 for (uint i = 0; i < implicit_table.len(); i++) {
2373 int exec_offset = (int) implicit_table.get_exec_offset(i);
2374 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2375 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2376 bool found = false;
2377 for (int i = 0, imax = oms->count(); i < imax; i++) {
2378 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2379 found = true;
2380 break;
2381 }
2382 }
2383 assert(found, "missing oopmap");
2384 }
2385 }
2386 }
2387 #endif
2388 #endif
2389
2390 VerifyOopsClosure voc(this);
2391 oops_do(&voc);
2392 assert(voc.ok(), "embedded oops must be OK");
2393 Universe::heap()->verify_nmethod(this);
2394
2395 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT,
2396 nm->method()->external_name(), p2i(_oops_do_mark_link));
2397 verify_scopes();
2398
2399 CompiledICLocker nm_verify(this);
2400 VerifyMetadataClosure vmc;
2401 metadata_do(&vmc);
2402 }
2403
2404
2405 void nmethod::verify_interrupt_point(address call_site) {
2406 // Verify IC only when nmethod installation is finished.
2407 if (!is_not_installed()) {
2408 if (CompiledICLocker::is_safe(this)) {
2409 CompiledIC_at(this, call_site);
2410 } else {
2411 CompiledICLocker ml_verify(this);
2412 CompiledIC_at(this, call_site);
2413 }
2414 }
2415
2416 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2417 assert(pd != NULL, "PcDesc must exist");
2418 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2419 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2420 pd->return_oop());
2421 !sd->is_top(); sd = sd->sender()) {
2422 sd->verify();
2423 }
2424 }
2425
2426 void nmethod::verify_scopes() {
2427 if( !method() ) return; // Runtime stubs have no scope
2428 if (method()->is_native()) return; // Ignore stub methods.
2429 // iterate through all interrupt point
2430 // and verify the debug information is valid.
2431 RelocIterator iter((nmethod*)this);
2432 while (iter.next()) {
2433 address stub = NULL;
2434 switch (iter.type()) {
2435 case relocInfo::virtual_call_type:
2436 verify_interrupt_point(iter.addr());
2437 break;
2438 case relocInfo::opt_virtual_call_type:
2439 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2440 verify_interrupt_point(iter.addr());
2441 break;
2442 case relocInfo::static_call_type:
2443 stub = iter.static_call_reloc()->static_stub(false);
2444 //verify_interrupt_point(iter.addr());
2445 break;
2446 case relocInfo::runtime_call_type:
2447 case relocInfo::runtime_call_w_cp_type: {
2448 address destination = iter.reloc()->value();
2449 // Right now there is no way to find out which entries support
2450 // an interrupt point. It would be nice if we had this
2451 // information in a table.
2452 break;
2453 }
2454 default:
2455 break;
2456 }
2457 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2458 }
2459 }
2460
2461
2462 // -----------------------------------------------------------------------------
2463 // Printing operations
2464
2465 void nmethod::print() const {
2466 ttyLocker ttyl; // keep the following output all in one block
2467 print(tty);
2468 }
2469
2470 void nmethod::print(outputStream* st) const {
2471 ResourceMark rm;
2472
2473 st->print("Compiled method ");
2474
2475 if (is_compiled_by_c1()) {
2476 st->print("(c1) ");
2477 } else if (is_compiled_by_c2()) {
2478 st->print("(c2) ");
2479 } else if (is_compiled_by_jvmci()) {
2480 st->print("(JVMCI) ");
2481 } else {
2482 st->print("(n/a) ");
2483 }
2484
2485 print_on(tty, NULL);
2486
2487 if (WizardMode) {
2488 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2489 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2490 st->print(" { ");
2491 st->print_cr("%s ", state());
2492 st->print_cr("}:");
2493 }
2494 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2495 p2i(this),
2496 p2i(this) + size(),
2497 size());
2498 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2499 p2i(relocation_begin()),
2500 p2i(relocation_end()),
2501 relocation_size());
2502 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2503 p2i(consts_begin()),
2504 p2i(consts_end()),
2505 consts_size());
2506 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2507 p2i(insts_begin()),
2508 p2i(insts_end()),
2509 insts_size());
2510 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2511 p2i(stub_begin()),
2512 p2i(stub_end()),
2513 stub_size());
2514 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2515 p2i(oops_begin()),
2516 p2i(oops_end()),
2517 oops_size());
2518 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2519 p2i(metadata_begin()),
2520 p2i(metadata_end()),
2521 metadata_size());
2522 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2523 p2i(scopes_data_begin()),
2524 p2i(scopes_data_end()),
2525 scopes_data_size());
2526 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2527 p2i(scopes_pcs_begin()),
2528 p2i(scopes_pcs_end()),
2529 scopes_pcs_size());
2530 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2531 p2i(dependencies_begin()),
2532 p2i(dependencies_end()),
2533 dependencies_size());
2534 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2535 p2i(handler_table_begin()),
2536 p2i(handler_table_end()),
2537 handler_table_size());
2538 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2539 p2i(nul_chk_table_begin()),
2540 p2i(nul_chk_table_end()),
2541 nul_chk_table_size());
2542 #if INCLUDE_JVMCI
2543 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2544 p2i(speculations_begin()),
2545 p2i(speculations_end()),
2546 speculations_size());
2547 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2548 p2i(jvmci_data_begin()),
2549 p2i(jvmci_data_end()),
2550 jvmci_data_size());
2551 #endif
2552 }
2553
2554 void nmethod::print_code() {
2555 HandleMark hm;
2556 ResourceMark m;
2557 ttyLocker ttyl;
2558 // Call the specialized decode method of this class.
2559 decode(tty);
2560 }
2561
2562 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2563
2564 void nmethod::print_dependencies() {
2565 ResourceMark rm;
2566 ttyLocker ttyl; // keep the following output all in one block
2567 tty->print_cr("Dependencies:");
2568 for (Dependencies::DepStream deps(this); deps.next(); ) {
2569 deps.print_dependency();
2570 Klass* ctxk = deps.context_type();
2571 if (ctxk != NULL) {
2572 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2573 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2574 }
2575 }
2576 deps.log_dependency(); // put it into the xml log also
2577 }
2578 }
2579 #endif
2580
2581 #if defined(SUPPORT_DATA_STRUCTS)
2582
2583 // Print the oops from the underlying CodeBlob.
2584 void nmethod::print_oops(outputStream* st) {
2585 HandleMark hm;
2586 ResourceMark m;
2587 st->print("Oops:");
2588 if (oops_begin() < oops_end()) {
2589 st->cr();
2590 for (oop* p = oops_begin(); p < oops_end(); p++) {
2591 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2592 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2593 if (*p == Universe::non_oop_word()) {
2594 st->print_cr("NON_OOP");
2595 continue; // skip non-oops
2596 }
2597 if (*p == NULL) {
2598 st->print_cr("NULL-oop");
2599 continue; // skip non-oops
2600 }
2601 (*p)->print_value_on(st);
2602 st->cr();
2603 }
2604 } else {
2605 st->print_cr(" <list empty>");
2606 }
2607 }
2608
2609 // Print metadata pool.
2610 void nmethod::print_metadata(outputStream* st) {
2611 HandleMark hm;
2612 ResourceMark m;
2613 st->print("Metadata:");
2614 if (metadata_begin() < metadata_end()) {
2615 st->cr();
2616 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2617 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2618 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2619 if (*p && *p != Universe::non_oop_word()) {
2620 (*p)->print_value_on(st);
2621 }
2622 st->cr();
2623 }
2624 } else {
2625 st->print_cr(" <list empty>");
2626 }
2627 }
2628
2629 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2630 void nmethod::print_scopes_on(outputStream* st) {
2631 // Find the first pc desc for all scopes in the code and print it.
2632 ResourceMark rm;
2633 st->print("scopes:");
2634 if (scopes_pcs_begin() < scopes_pcs_end()) {
2635 st->cr();
2636 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2637 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2638 continue;
2639
2640 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2641 while (sd != NULL) {
2642 sd->print_on(st, p); // print output ends with a newline
2643 sd = sd->sender();
2644 }
2645 }
2646 } else {
2647 st->print_cr(" <list empty>");
2648 }
2649 }
2650 #endif
2651
2652 #ifndef PRODUCT // RelocIterator does support printing only then.
2653 void nmethod::print_relocations() {
2654 ResourceMark m; // in case methods get printed via the debugger
2655 tty->print_cr("relocations:");
2656 RelocIterator iter(this);
2657 iter.print();
2658 }
2659 #endif
2660
2661 void nmethod::print_pcs_on(outputStream* st) {
2662 ResourceMark m; // in case methods get printed via debugger
2663 st->print("pc-bytecode offsets:");
2664 if (scopes_pcs_begin() < scopes_pcs_end()) {
2665 st->cr();
2666 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2667 p->print_on(st, this); // print output ends with a newline
2668 }
2669 } else {
2670 st->print_cr(" <list empty>");
2671 }
2672 }
2673
2674 void nmethod::print_handler_table() {
2675 ExceptionHandlerTable(this).print();
2676 }
2677
2678 void nmethod::print_nul_chk_table() {
2679 ImplicitExceptionTable(this).print(code_begin());
2680 }
2681
2682 void nmethod::print_recorded_oops() {
2683 const int n = oops_count();
2684 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2685 tty->print("Recorded oops:");
2686 if (n > 0) {
2687 tty->cr();
2688 for (int i = 0; i < n; i++) {
2689 oop o = oop_at(i);
2690 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2691 if (o == (oop)Universe::non_oop_word()) {
2692 tty->print("non-oop word");
2693 } else if (o == NULL) {
2694 tty->print("NULL-oop");
2695 } else {
2696 o->print_value_on(tty);
2697 }
2698 tty->cr();
2699 }
2700 } else {
2701 tty->print_cr(" <list empty>");
2702 }
2703 }
2704
2705 void nmethod::print_recorded_metadata() {
2706 const int n = metadata_count();
2707 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2708 tty->print("Recorded metadata:");
2709 if (n > 0) {
2710 tty->cr();
2711 for (int i = 0; i < n; i++) {
2712 Metadata* m = metadata_at(i);
2713 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2714 if (m == (Metadata*)Universe::non_oop_word()) {
2715 tty->print("non-metadata word");
2716 } else if (m == NULL) {
2717 tty->print("NULL-oop");
2718 } else {
2719 Metadata::print_value_on_maybe_null(tty, m);
2720 }
2721 tty->cr();
2722 }
2723 } else {
2724 tty->print_cr(" <list empty>");
2725 }
2726 }
2727 #endif
2728
2729 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2730
2731 void nmethod::print_constant_pool(outputStream* st) {
2732 //-----------------------------------
2733 //---< Print the constant pool >---
2734 //-----------------------------------
2735 int consts_size = this->consts_size();
2736 if ( consts_size > 0 ) {
2737 unsigned char* cstart = this->consts_begin();
2738 unsigned char* cp = cstart;
2739 unsigned char* cend = cp + consts_size;
2740 unsigned int bytes_per_line = 4;
2741 unsigned int CP_alignment = 8;
2742 unsigned int n;
2743
2744 st->cr();
2745
2746 //---< print CP header to make clear what's printed >---
2747 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2748 n = bytes_per_line;
2749 st->print_cr("[Constant Pool]");
2750 Disassembler::print_location(cp, cstart, cend, st, true, true);
2751 Disassembler::print_hexdata(cp, n, st, true);
2752 st->cr();
2753 } else {
2754 n = (uintptr_t)cp&(bytes_per_line-1);
2755 st->print_cr("[Constant Pool (unaligned)]");
2756 }
2757
2758 //---< print CP contents, bytes_per_line at a time >---
2759 while (cp < cend) {
2760 Disassembler::print_location(cp, cstart, cend, st, true, false);
2761 Disassembler::print_hexdata(cp, n, st, false);
2762 cp += n;
2763 n = bytes_per_line;
2764 st->cr();
2765 }
2766
2767 //---< Show potential alignment gap between constant pool and code >---
2768 cend = code_begin();
2769 if( cp < cend ) {
2770 n = 4;
2771 st->print_cr("[Code entry alignment]");
2772 while (cp < cend) {
2773 Disassembler::print_location(cp, cstart, cend, st, false, false);
2774 cp += n;
2775 st->cr();
2776 }
2777 }
2778 } else {
2779 st->print_cr("[Constant Pool (empty)]");
2780 }
2781 st->cr();
2782 }
2783
2784 #endif
2785
2786 // Disassemble this nmethod.
2787 // Print additional debug information, if requested. This could be code
2788 // comments, block comments, profiling counters, etc.
2789 // The undisassembled format is useful no disassembler library is available.
2790 // The resulting hex dump (with markers) can be disassembled later, or on
2791 // another system, when/where a disassembler library is available.
2792 void nmethod::decode2(outputStream* ost) const {
2793
2794 // Called from frame::back_trace_with_decode without ResourceMark.
2795 ResourceMark rm;
2796
2797 // Make sure we have a valid stream to print on.
2798 outputStream* st = ost ? ost : tty;
2799
2800 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2801 const bool use_compressed_format = true;
2802 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2803 AbstractDisassembler::show_block_comment());
2804 #else
2805 const bool use_compressed_format = Disassembler::is_abstract();
2806 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2807 AbstractDisassembler::show_block_comment());
2808 #endif
2809
2810 st->cr();
2811 this->print(st);
2812 st->cr();
2813
2814 #if defined(SUPPORT_ASSEMBLY)
2815 //----------------------------------
2816 //---< Print real disassembly >---
2817 //----------------------------------
2818 if (! use_compressed_format) {
2819 Disassembler::decode(const_cast<nmethod*>(this), st);
2820 return;
2821 }
2822 #endif
2823
2824 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2825
2826 // Compressed undisassembled disassembly format.
2827 // The following stati are defined/supported:
2828 // = 0 - currently at bol() position, nothing printed yet on current line.
2829 // = 1 - currently at position after print_location().
2830 // > 1 - in the midst of printing instruction stream bytes.
2831 int compressed_format_idx = 0;
2832 int code_comment_column = 0;
2833 const int instr_maxlen = Assembler::instr_maxlen();
2834 const uint tabspacing = 8;
2835 unsigned char* start = this->code_begin();
2836 unsigned char* p = this->code_begin();
2837 unsigned char* end = this->code_end();
2838 unsigned char* pss = p; // start of a code section (used for offsets)
2839
2840 if ((start == NULL) || (end == NULL)) {
2841 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2842 return;
2843 }
2844 #endif
2845
2846 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2847 //---< plain abstract disassembly, no comments or anything, just section headers >---
2848 if (use_compressed_format && ! compressed_with_comments) {
2849 const_cast<nmethod*>(this)->print_constant_pool(st);
2850
2851 //---< Open the output (Marker for post-mortem disassembler) >---
2852 st->print_cr("[MachCode]");
2853 const char* header = NULL;
2854 address p0 = p;
2855 while (p < end) {
2856 address pp = p;
2857 while ((p < end) && (header == NULL)) {
2858 header = nmethod_section_label(p);
2859 pp = p;
2860 p += Assembler::instr_len(p);
2861 }
2862 if (pp > p0) {
2863 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2864 p0 = pp;
2865 p = pp;
2866 header = NULL;
2867 } else if (header != NULL) {
2868 st->bol();
2869 st->print_cr("%s", header);
2870 header = NULL;
2871 }
2872 }
2873 //---< Close the output (Marker for post-mortem disassembler) >---
2874 st->bol();
2875 st->print_cr("[/MachCode]");
2876 return;
2877 }
2878 #endif
2879
2880 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2881 //---< abstract disassembly with comments and section headers merged in >---
2882 if (compressed_with_comments) {
2883 const_cast<nmethod*>(this)->print_constant_pool(st);
2884
2885 //---< Open the output (Marker for post-mortem disassembler) >---
2886 st->print_cr("[MachCode]");
2887 while ((p < end) && (p != NULL)) {
2888 const int instruction_size_in_bytes = Assembler::instr_len(p);
2889
2890 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2891 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2892 // Prints nmethod_section_label as well.
2893 if (AbstractDisassembler::show_block_comment()) {
2894 print_block_comment(st, p);
2895 if (st->position() == 0) {
2896 compressed_format_idx = 0;
2897 }
2898 }
2899
2900 //---< New location information after line break >---
2901 if (compressed_format_idx == 0) {
2902 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2903 compressed_format_idx = 1;
2904 }
2905
2906 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2907 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2908 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2909
2910 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2911 //---< interrupt instruction byte stream for code comment >---
2912 if (compressed_format_idx > 1) {
2913 st->cr(); // interrupt byte stream
2914 st->cr(); // add an empty line
2915 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2916 }
2917 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2918 st->bol();
2919 compressed_format_idx = 0;
2920 }
2921
2922 //---< New location information after line break >---
2923 if (compressed_format_idx == 0) {
2924 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2925 compressed_format_idx = 1;
2926 }
2927
2928 //---< Nicely align instructions for readability >---
2929 if (compressed_format_idx > 1) {
2930 Disassembler::print_delimiter(st);
2931 }
2932
2933 //---< Now, finally, print the actual instruction bytes >---
2934 unsigned char* p0 = p;
2935 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2936 compressed_format_idx += p - p0;
2937
2938 if (Disassembler::start_newline(compressed_format_idx-1)) {
2939 st->cr();
2940 compressed_format_idx = 0;
2941 }
2942 }
2943 //---< Close the output (Marker for post-mortem disassembler) >---
2944 st->bol();
2945 st->print_cr("[/MachCode]");
2946 return;
2947 }
2948 #endif
2949 }
2950
2951 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2952
2953 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2954 RelocIterator iter(this, begin, end);
2955 bool have_one = false;
2956 while (iter.next()) {
2957 have_one = true;
2958 switch (iter.type()) {
2959 case relocInfo::none: return "no_reloc";
2960 case relocInfo::oop_type: {
2961 // Get a non-resizable resource-allocated stringStream.
2962 // Our callees make use of (nested) ResourceMarks.
2963 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2964 oop_Relocation* r = iter.oop_reloc();
2965 oop obj = r->oop_value();
2966 st.print("oop(");
2967 if (obj == NULL) st.print("NULL");
2968 else obj->print_value_on(&st);
2969 st.print(")");
2970 return st.as_string();
2971 }
2972 case relocInfo::metadata_type: {
2973 stringStream st;
2974 metadata_Relocation* r = iter.metadata_reloc();
2975 Metadata* obj = r->metadata_value();
2976 st.print("metadata(");
2977 if (obj == NULL) st.print("NULL");
2978 else obj->print_value_on(&st);
2979 st.print(")");
2980 return st.as_string();
2981 }
2982 case relocInfo::runtime_call_type:
2983 case relocInfo::runtime_call_w_cp_type: {
2984 stringStream st;
2985 st.print("runtime_call");
2986 CallRelocation* r = (CallRelocation*)iter.reloc();
2987 address dest = r->destination();
2988 CodeBlob* cb = CodeCache::find_blob(dest);
2989 if (cb != NULL) {
2990 st.print(" %s", cb->name());
2991 } else {
2992 ResourceMark rm;
2993 const int buflen = 1024;
2994 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2995 int offset;
2996 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2997 st.print(" %s", buf);
2998 if (offset != 0) {
2999 st.print("+%d", offset);
3000 }
3001 }
3002 }
3003 return st.as_string();
3004 }
3005 case relocInfo::virtual_call_type: {
3006 stringStream st;
3007 st.print_raw("virtual_call");
3008 virtual_call_Relocation* r = iter.virtual_call_reloc();
3009 Method* m = r->method_value();
3010 if (m != NULL) {
3011 assert(m->is_method(), "");
3012 m->print_short_name(&st);
3013 }
3014 return st.as_string();
3015 }
3016 case relocInfo::opt_virtual_call_type: {
3017 stringStream st;
3018 st.print_raw("optimized virtual_call");
3019 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3020 Method* m = r->method_value();
3021 if (m != NULL) {
3022 assert(m->is_method(), "");
3023 m->print_short_name(&st);
3024 }
3025 return st.as_string();
3026 }
3027 case relocInfo::static_call_type: {
3028 stringStream st;
3029 st.print_raw("static_call");
3030 static_call_Relocation* r = iter.static_call_reloc();
3031 Method* m = r->method_value();
3032 if (m != NULL) {
3033 assert(m->is_method(), "");
3034 m->print_short_name(&st);
3035 }
3036 return st.as_string();
3037 }
3038 case relocInfo::static_stub_type: return "static_stub";
3039 case relocInfo::external_word_type: return "external_word";
3040 case relocInfo::internal_word_type: return "internal_word";
3041 case relocInfo::section_word_type: return "section_word";
3042 case relocInfo::poll_type: return "poll";
3043 case relocInfo::poll_return_type: return "poll_return";
3044 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3045 case relocInfo::type_mask: return "type_bit_mask";
3046
3047 default:
3048 break;
3049 }
3050 }
3051 return have_one ? "other" : NULL;
3052 }
3053
3054 // Return a the last scope in (begin..end]
3055 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3056 PcDesc* p = pc_desc_near(begin+1);
3057 if (p != NULL && p->real_pc(this) <= end) {
3058 return new ScopeDesc(this, p->scope_decode_offset(),
3059 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3060 p->return_oop());
3061 }
3062 return NULL;
3063 }
3064
3065 const char* nmethod::nmethod_section_label(address pos) const {
3066 const char* label = NULL;
3067 if (pos == code_begin()) label = "[Instructions begin]";
3068 if (pos == entry_point()) label = "[Entry Point]";
3069 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3070 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3071 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3072 // Check stub_code before checking exception_handler or deopt_handler.
3073 if (pos == this->stub_begin()) label = "[Stub Code]";
3074 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3075 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3076 return label;
3077 }
3078
3079 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3080 if (print_section_labels) {
3081 const char* label = nmethod_section_label(block_begin);
3082 if (label != NULL) {
3083 stream->bol();
3084 stream->print_cr("%s", label);
3085 }
3086 }
3087
3088 if (block_begin == entry_point()) {
3089 Method* m = method();
3090 if (m != NULL) {
3091 stream->print(" # ");
3092 m->print_value_on(stream);
3093 stream->cr();
3094 }
3095 if (m != NULL && !is_osr_method()) {
3096 ResourceMark rm;
3097 int sizeargs = m->size_of_parameters();
3098 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3099 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3100 {
3101 int sig_index = 0;
3102 if (!m->is_static())
3103 sig_bt[sig_index++] = T_OBJECT; // 'this'
3104 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3105 BasicType t = ss.type();
3106 sig_bt[sig_index++] = t;
3107 if (type2size[t] == 2) {
3108 sig_bt[sig_index++] = T_VOID;
3109 } else {
3110 assert(type2size[t] == 1, "size is 1 or 2");
3111 }
3112 }
3113 assert(sig_index == sizeargs, "");
3114 }
3115 const char* spname = "sp"; // make arch-specific?
3116 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3117 int stack_slot_offset = this->frame_size() * wordSize;
3118 int tab1 = 14, tab2 = 24;
3119 int sig_index = 0;
3120 int arg_index = (m->is_static() ? 0 : -1);
3121 bool did_old_sp = false;
3122 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3123 bool at_this = (arg_index == -1);
3124 bool at_old_sp = false;
3125 BasicType t = (at_this ? T_OBJECT : ss.type());
3126 assert(t == sig_bt[sig_index], "sigs in sync");
3127 if (at_this)
3128 stream->print(" # this: ");
3129 else
3130 stream->print(" # parm%d: ", arg_index);
3131 stream->move_to(tab1);
3132 VMReg fst = regs[sig_index].first();
3133 VMReg snd = regs[sig_index].second();
3134 if (fst->is_reg()) {
3135 stream->print("%s", fst->name());
3136 if (snd->is_valid()) {
3137 stream->print(":%s", snd->name());
3138 }
3139 } else if (fst->is_stack()) {
3140 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3141 if (offset == stack_slot_offset) at_old_sp = true;
3142 stream->print("[%s+0x%x]", spname, offset);
3143 } else {
3144 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3145 }
3146 stream->print(" ");
3147 stream->move_to(tab2);
3148 stream->print("= ");
3149 if (at_this) {
3150 m->method_holder()->print_value_on(stream);
3151 } else {
3152 bool did_name = false;
3153 if (!at_this && ss.is_reference()) {
3154 Symbol* name = ss.as_symbol();
3155 name->print_value_on(stream);
3156 did_name = true;
3157 }
3158 if (!did_name)
3159 stream->print("%s", type2name(t));
3160 }
3161 if (at_old_sp) {
3162 stream->print(" (%s of caller)", spname);
3163 did_old_sp = true;
3164 }
3165 stream->cr();
3166 sig_index += type2size[t];
3167 arg_index += 1;
3168 if (!at_this) ss.next();
3169 }
3170 if (!did_old_sp) {
3171 stream->print(" # ");
3172 stream->move_to(tab1);
3173 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3174 stream->print(" (%s of caller)", spname);
3175 stream->cr();
3176 }
3177 }
3178 }
3179 }
3180
3181 // Returns whether this nmethod has code comments.
3182 bool nmethod::has_code_comment(address begin, address end) {
3183 // scopes?
3184 ScopeDesc* sd = scope_desc_in(begin, end);
3185 if (sd != NULL) return true;
3186
3187 // relocations?
3188 const char* str = reloc_string_for(begin, end);
3189 if (str != NULL) return true;
3190
3191 // implicit exceptions?
3192 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3193 if (cont_offset != 0) return true;
3194
3195 return false;
3196 }
3197
3198 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3199 ImplicitExceptionTable implicit_table(this);
3200 int pc_offset = begin - code_begin();
3201 int cont_offset = implicit_table.continuation_offset(pc_offset);
3202 bool oop_map_required = false;
3203 if (cont_offset != 0) {
3204 st->move_to(column, 6, 0);
3205 if (pc_offset == cont_offset) {
3206 st->print("; implicit exception: deoptimizes");
3207 oop_map_required = true;
3208 } else {
3209 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3210 }
3211 }
3212
3213 // Find an oopmap in (begin, end]. We use the odd half-closed
3214 // interval so that oop maps and scope descs which are tied to the
3215 // byte after a call are printed with the call itself. OopMaps
3216 // associated with implicit exceptions are printed with the implicit
3217 // instruction.
3218 address base = code_begin();
3219 ImmutableOopMapSet* oms = oop_maps();
3220 if (oms != NULL) {
3221 for (int i = 0, imax = oms->count(); i < imax; i++) {
3222 const ImmutableOopMapPair* pair = oms->pair_at(i);
3223 const ImmutableOopMap* om = pair->get_from(oms);
3224 address pc = base + pair->pc_offset();
3225 if (pc >= begin) {
3226 #if INCLUDE_JVMCI
3227 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3228 #else
3229 bool is_implicit_deopt = false;
3230 #endif
3231 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3232 st->move_to(column, 6, 0);
3233 st->print("; ");
3234 om->print_on(st);
3235 oop_map_required = false;
3236 }
3237 }
3238 if (pc > end) {
3239 break;
3240 }
3241 }
3242 }
3243 assert(!oop_map_required, "missed oopmap");
3244
3245 Thread* thread = Thread::current();
3246
3247 // Print any debug info present at this pc.
3248 ScopeDesc* sd = scope_desc_in(begin, end);
3249 if (sd != NULL) {
3250 st->move_to(column, 6, 0);
3251 if (sd->bci() == SynchronizationEntryBCI) {
3252 st->print(";*synchronization entry");
3253 } else if (sd->bci() == AfterBci) {
3254 st->print(";* method exit (unlocked if synchronized)");
3255 } else if (sd->bci() == UnwindBci) {
3256 st->print(";* unwind (locked if synchronized)");
3257 } else if (sd->bci() == AfterExceptionBci) {
3258 st->print(";* unwind (unlocked if synchronized)");
3259 } else if (sd->bci() == UnknownBci) {
3260 st->print(";* unknown");
3261 } else if (sd->bci() == InvalidFrameStateBci) {
3262 st->print(";* invalid frame state");
3263 } else {
3264 if (sd->method() == NULL) {
3265 st->print("method is NULL");
3266 } else if (sd->method()->is_native()) {
3267 st->print("method is native");
3268 } else {
3269 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3270 st->print(";*%s", Bytecodes::name(bc));
3271 switch (bc) {
3272 case Bytecodes::_invokevirtual:
3273 case Bytecodes::_invokespecial:
3274 case Bytecodes::_invokestatic:
3275 case Bytecodes::_invokeinterface:
3276 {
3277 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
3278 st->print(" ");
3279 if (invoke.name() != NULL)
3280 invoke.name()->print_symbol_on(st);
3281 else
3282 st->print("<UNKNOWN>");
3283 break;
3284 }
3285 case Bytecodes::_getfield:
3286 case Bytecodes::_putfield:
3287 case Bytecodes::_getstatic:
3288 case Bytecodes::_putstatic:
3289 {
3290 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
3291 st->print(" ");
3292 if (field.name() != NULL)
3293 field.name()->print_symbol_on(st);
3294 else
3295 st->print("<UNKNOWN>");
3296 }
3297 default:
3298 break;
3299 }
3300 }
3301 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3302 }
3303
3304 // Print all scopes
3305 for (;sd != NULL; sd = sd->sender()) {
3306 st->move_to(column, 6, 0);
3307 st->print("; -");
3308 if (sd->should_reexecute()) {
3309 st->print(" (reexecute)");
3310 }
3311 if (sd->method() == NULL) {
3312 st->print("method is NULL");
3313 } else {
3314 sd->method()->print_short_name(st);
3315 }
3316 int lineno = sd->method()->line_number_from_bci(sd->bci());
3317 if (lineno != -1) {
3318 st->print("@%d (line %d)", sd->bci(), lineno);
3319 } else {
3320 st->print("@%d", sd->bci());
3321 }
3322 st->cr();
3323 }
3324 }
3325
3326 // Print relocation information
3327 // Prevent memory leak: allocating without ResourceMark.
3328 ResourceMark rm;
3329 const char* str = reloc_string_for(begin, end);
3330 if (str != NULL) {
3331 if (sd != NULL) st->cr();
3332 st->move_to(column, 6, 0);
3333 st->print("; {%s}", str);
3334 }
3335 }
3336
3337 #endif
3338
3339 class DirectNativeCallWrapper: public NativeCallWrapper {
3340 private:
3341 NativeCall* _call;
3342
3343 public:
3344 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3345
3346 virtual address destination() const { return _call->destination(); }
3347 virtual address instruction_address() const { return _call->instruction_address(); }
3348 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3349 virtual address return_address() const { return _call->return_address(); }
3350
3351 virtual address get_resolve_call_stub(bool is_optimized) const {
3352 if (is_optimized) {
3353 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3354 }
3355 return SharedRuntime::get_resolve_virtual_call_stub();
3356 }
3357
3358 virtual void set_destination_mt_safe(address dest) {
3359 #if INCLUDE_AOT
3360 if (UseAOT) {
3361 CodeBlob* callee = CodeCache::find_blob(dest);
3362 CompiledMethod* cm = callee->as_compiled_method_or_null();
3363 if (cm != NULL && cm->is_far_code()) {
3364 // Temporary fix, see JDK-8143106
3365 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3366 csc->set_to_far(methodHandle(Thread::current(), cm->method()), dest);
3367 return;
3368 }
3369 }
3370 #endif
3371 _call->set_destination_mt_safe(dest);
3372 }
3373
3374 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3375 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3376 #if INCLUDE_AOT
3377 if (info.to_aot()) {
3378 csc->set_to_far(method, info.entry());
3379 } else
3380 #endif
3381 {
3382 csc->set_to_interpreted(method, info.entry());
3383 }
3384 }
3385
3386 virtual void verify() const {
3387 // make sure code pattern is actually a call imm32 instruction
3388 _call->verify();
3389 _call->verify_alignment();
3390 }
3391
3392 virtual void verify_resolve_call(address dest) const {
3393 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3394 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3395 }
3396
3397 virtual bool is_call_to_interpreted(address dest) const {
3398 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3399 return cb->contains(dest);
3400 }
3401
3402 virtual bool is_safe_for_patching() const { return false; }
3403
3404 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3405 return nativeMovConstReg_at(r->cached_value());
3406 }
3407
3408 virtual void *get_data(NativeInstruction* instruction) const {
3409 return (void*)((NativeMovConstReg*) instruction)->data();
3410 }
3411
3412 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3413 ((NativeMovConstReg*) instruction)->set_data(data);
3414 }
3415 };
3416
3417 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3418 return new DirectNativeCallWrapper((NativeCall*) call);
3419 }
3420
3421 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3422 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3423 }
3424
3425 address nmethod::call_instruction_address(address pc) const {
3426 if (NativeCall::is_call_before(pc)) {
3427 NativeCall *ncall = nativeCall_before(pc);
3428 return ncall->instruction_address();
3429 }
3430 return NULL;
3431 }
3432
3433 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3434 return CompiledDirectStaticCall::at(call_site);
3435 }
3436
3437 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3438 return CompiledDirectStaticCall::at(call_site);
3439 }
3440
3441 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3442 return CompiledDirectStaticCall::before(return_addr);
3443 }
3444
3445 #if defined(SUPPORT_DATA_STRUCTS)
3446 void nmethod::print_value_on(outputStream* st) const {
3447 st->print("nmethod");
3448 print_on(st, NULL);
3449 }
3450 #endif
3451
3452 #ifndef PRODUCT
3453
3454 void nmethod::print_calls(outputStream* st) {
3455 RelocIterator iter(this);
3456 while (iter.next()) {
3457 switch (iter.type()) {
3458 case relocInfo::virtual_call_type:
3459 case relocInfo::opt_virtual_call_type: {
3460 CompiledICLocker ml_verify(this);
3461 CompiledIC_at(&iter)->print();
3462 break;
3463 }
3464 case relocInfo::static_call_type:
3465 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3466 CompiledDirectStaticCall::at(iter.reloc())->print();
3467 break;
3468 default:
3469 break;
3470 }
3471 }
3472 }
3473
3474 void nmethod::print_statistics() {
3475 ttyLocker ttyl;
3476 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3477 native_nmethod_stats.print_native_nmethod_stats();
3478 #ifdef COMPILER1
3479 c1_java_nmethod_stats.print_nmethod_stats("C1");
3480 #endif
3481 #ifdef COMPILER2
3482 c2_java_nmethod_stats.print_nmethod_stats("C2");
3483 #endif
3484 #if INCLUDE_JVMCI
3485 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3486 #endif
3487 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3488 DebugInformationRecorder::print_statistics();
3489 #ifndef PRODUCT
3490 pc_nmethod_stats.print_pc_stats();
3491 #endif
3492 Dependencies::print_statistics();
3493 if (xtty != NULL) xtty->tail("statistics");
3494 }
3495
3496 #endif // !PRODUCT
3497
3498 #if INCLUDE_JVMCI
3499 void nmethod::update_speculation(JavaThread* thread) {
3500 jlong speculation = thread->pending_failed_speculation();
3501 if (speculation != 0) {
3502 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3503 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3504 thread->set_pending_failed_speculation(0);
3505 }
3506 }
3507
3508 const char* nmethod::jvmci_name() {
3509 if (jvmci_nmethod_data() != NULL) {
3510 return jvmci_nmethod_data()->name();
3511 }
3512 return NULL;
3513 }
3514 #endif