1 /*
2 * Copyright (c) 1997, 2019, 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 "runtime/atomic.hpp"
53 #include "runtime/deoptimization.hpp"
54 #include "runtime/flags/flagSetting.hpp"
55 #include "runtime/frame.inline.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/orderAccess.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepointVerifiers.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/sweeper.hpp"
63 #include "runtime/vmThread.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/dtrace.hpp"
66 #include "utilities/events.hpp"
67 #include "utilities/resourceHash.hpp"
68 #include "utilities/xmlstream.hpp"
69 #if INCLUDE_JVMCI
70 #include "jvmci/jvmciRuntime.hpp"
71 #endif
72
73 #ifdef DTRACE_ENABLED
74
75 // Only bother with this argument setup if dtrace is available
76
77 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
78 { \
79 Method* m = (method); \
80 if (m != NULL) { \
81 Symbol* klass_name = m->klass_name(); \
82 Symbol* name = m->name(); \
83 Symbol* signature = m->signature(); \
84 HOTSPOT_COMPILED_METHOD_UNLOAD( \
85 (char *) klass_name->bytes(), klass_name->utf8_length(), \
86 (char *) name->bytes(), name->utf8_length(), \
87 (char *) signature->bytes(), signature->utf8_length()); \
88 } \
89 }
90
91 #else // ndef DTRACE_ENABLED
92
93 #define DTRACE_METHOD_UNLOAD_PROBE(method)
94
95 #endif
96
97 //---------------------------------------------------------------------------------
98 // NMethod statistics
99 // They are printed under various flags, including:
100 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
101 // (In the latter two cases, they like other stats are printed to the log only.)
102
103 #ifndef PRODUCT
104 // These variables are put into one block to reduce relocations
105 // and make it simpler to print from the debugger.
106 struct java_nmethod_stats_struct {
107 int nmethod_count;
108 int total_size;
109 int relocation_size;
110 int consts_size;
111 int insts_size;
112 int stub_size;
113 int scopes_data_size;
114 int scopes_pcs_size;
115 int dependencies_size;
116 int handler_table_size;
117 int nul_chk_table_size;
118 #if INCLUDE_JVMCI
119 int speculations_size;
120 int jvmci_data_size;
121 #endif
122 int oops_size;
123 int metadata_size;
124
125 void note_nmethod(nmethod* nm) {
126 nmethod_count += 1;
127 total_size += nm->size();
128 relocation_size += nm->relocation_size();
129 consts_size += nm->consts_size();
130 insts_size += nm->insts_size();
131 stub_size += nm->stub_size();
132 oops_size += nm->oops_size();
133 metadata_size += nm->metadata_size();
134 scopes_data_size += nm->scopes_data_size();
135 scopes_pcs_size += nm->scopes_pcs_size();
136 dependencies_size += nm->dependencies_size();
137 handler_table_size += nm->handler_table_size();
138 nul_chk_table_size += nm->nul_chk_table_size();
139 #if INCLUDE_JVMCI
140 speculations_size += nm->speculations_size();
141 jvmci_data_size += nm->jvmci_data_size();
142 #endif
143 }
144 void print_nmethod_stats(const char* name) {
145 if (nmethod_count == 0) return;
146 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
147 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
148 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
149 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
150 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
151 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
152 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
153 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
154 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
155 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
156 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
157 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
158 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
159 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
160 #if INCLUDE_JVMCI
161 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
162 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
163 #endif
164 }
165 };
166
167 struct native_nmethod_stats_struct {
168 int native_nmethod_count;
169 int native_total_size;
170 int native_relocation_size;
171 int native_insts_size;
172 int native_oops_size;
173 int native_metadata_size;
174 void note_native_nmethod(nmethod* nm) {
175 native_nmethod_count += 1;
176 native_total_size += nm->size();
177 native_relocation_size += nm->relocation_size();
178 native_insts_size += nm->insts_size();
179 native_oops_size += nm->oops_size();
180 native_metadata_size += nm->metadata_size();
181 }
182 void print_native_nmethod_stats() {
183 if (native_nmethod_count == 0) return;
184 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
185 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
186 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
187 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
188 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
189 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
190 }
191 };
192
193 struct pc_nmethod_stats_struct {
194 int pc_desc_resets; // number of resets (= number of caches)
195 int pc_desc_queries; // queries to nmethod::find_pc_desc
196 int pc_desc_approx; // number of those which have approximate true
197 int pc_desc_repeats; // number of _pc_descs[0] hits
198 int pc_desc_hits; // number of LRU cache hits
199 int pc_desc_tests; // total number of PcDesc examinations
200 int pc_desc_searches; // total number of quasi-binary search steps
201 int pc_desc_adds; // number of LUR cache insertions
202
203 void print_pc_stats() {
204 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
205 pc_desc_queries,
206 (double)(pc_desc_tests + pc_desc_searches)
207 / pc_desc_queries);
208 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
209 pc_desc_resets,
210 pc_desc_queries, pc_desc_approx,
211 pc_desc_repeats, pc_desc_hits,
212 pc_desc_tests, pc_desc_searches, pc_desc_adds);
213 }
214 };
215
216 #ifdef COMPILER1
217 static java_nmethod_stats_struct c1_java_nmethod_stats;
218 #endif
219 #ifdef COMPILER2
220 static java_nmethod_stats_struct c2_java_nmethod_stats;
221 #endif
222 #if INCLUDE_JVMCI
223 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
224 #endif
225 static java_nmethod_stats_struct unknown_java_nmethod_stats;
226
227 static native_nmethod_stats_struct native_nmethod_stats;
228 static pc_nmethod_stats_struct pc_nmethod_stats;
229
230 static void note_java_nmethod(nmethod* nm) {
231 #ifdef COMPILER1
232 if (nm->is_compiled_by_c1()) {
233 c1_java_nmethod_stats.note_nmethod(nm);
234 } else
235 #endif
236 #ifdef COMPILER2
237 if (nm->is_compiled_by_c2()) {
238 c2_java_nmethod_stats.note_nmethod(nm);
239 } else
240 #endif
241 #if INCLUDE_JVMCI
242 if (nm->is_compiled_by_jvmci()) {
243 jvmci_java_nmethod_stats.note_nmethod(nm);
244 } else
245 #endif
246 {
247 unknown_java_nmethod_stats.note_nmethod(nm);
248 }
249 }
250 #endif // !PRODUCT
251
252 //---------------------------------------------------------------------------------
253
254
255 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
256 assert(pc != NULL, "Must be non null");
257 assert(exception.not_null(), "Must be non null");
258 assert(handler != NULL, "Must be non null");
259
260 _count = 0;
261 _exception_type = exception->klass();
262 _next = NULL;
263 _purge_list_next = NULL;
264
265 add_address_and_handler(pc,handler);
266 }
267
268
269 address ExceptionCache::match(Handle exception, address pc) {
270 assert(pc != NULL,"Must be non null");
271 assert(exception.not_null(),"Must be non null");
272 if (exception->klass() == exception_type()) {
273 return (test_address(pc));
274 }
275
276 return NULL;
277 }
278
279
280 bool ExceptionCache::match_exception_with_space(Handle exception) {
281 assert(exception.not_null(),"Must be non null");
282 if (exception->klass() == exception_type() && count() < cache_size) {
283 return true;
284 }
285 return false;
286 }
287
288
289 address ExceptionCache::test_address(address addr) {
290 int limit = count();
291 for (int i = 0; i < limit; i++) {
292 if (pc_at(i) == addr) {
293 return handler_at(i);
294 }
295 }
296 return NULL;
297 }
298
299
300 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
301 if (test_address(addr) == handler) return true;
302
303 int index = count();
304 if (index < cache_size) {
305 set_pc_at(index, addr);
306 set_handler_at(index, handler);
307 increment_count();
308 return true;
309 }
310 return false;
311 }
312
313 ExceptionCache* ExceptionCache::next() {
314 return Atomic::load(&_next);
315 }
316
317 void ExceptionCache::set_next(ExceptionCache *ec) {
318 Atomic::store(ec, &_next);
319 }
320
321 //-----------------------------------------------------------------------------
322
323
324 // Helper used by both find_pc_desc methods.
325 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
326 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
327 if (!approximate)
328 return pc->pc_offset() == pc_offset;
329 else
330 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
331 }
332
333 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
334 if (initial_pc_desc == NULL) {
335 _pc_descs[0] = NULL; // native method; no PcDescs at all
336 return;
337 }
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
339 // reset the cache by filling it with benign (non-null) values
340 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
341 for (int i = 0; i < cache_size; i++)
342 _pc_descs[i] = initial_pc_desc;
343 }
344
345 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
346 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
347 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
348
349 // Note: one might think that caching the most recently
350 // read value separately would be a win, but one would be
351 // wrong. When many threads are updating it, the cache
352 // line it's in would bounce between caches, negating
353 // any benefit.
354
355 // In order to prevent race conditions do not load cache elements
356 // repeatedly, but use a local copy:
357 PcDesc* res;
358
359 // Step one: Check the most recently added value.
360 res = _pc_descs[0];
361 if (res == NULL) return NULL; // native method; no PcDescs at all
362 if (match_desc(res, pc_offset, approximate)) {
363 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
364 return res;
365 }
366
367 // Step two: Check the rest of the LRU cache.
368 for (int i = 1; i < cache_size; ++i) {
369 res = _pc_descs[i];
370 if (res->pc_offset() < 0) break; // optimization: skip empty cache
371 if (match_desc(res, pc_offset, approximate)) {
372 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
373 return res;
374 }
375 }
376
377 // Report failure.
378 return NULL;
379 }
380
381 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
382 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
383 // Update the LRU cache by shifting pc_desc forward.
384 for (int i = 0; i < cache_size; i++) {
385 PcDesc* next = _pc_descs[i];
386 _pc_descs[i] = pc_desc;
387 pc_desc = next;
388 }
389 }
390
391 // adjust pcs_size so that it is a multiple of both oopSize and
392 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
393 // of oopSize, then 2*sizeof(PcDesc) is)
394 static int adjust_pcs_size(int pcs_size) {
395 int nsize = align_up(pcs_size, oopSize);
396 if ((nsize % sizeof(PcDesc)) != 0) {
397 nsize = pcs_size + sizeof(PcDesc);
398 }
399 assert((nsize % oopSize) == 0, "correct alignment");
400 return nsize;
401 }
402
403
404 int nmethod::total_size() const {
405 return
406 consts_size() +
407 insts_size() +
408 stub_size() +
409 scopes_data_size() +
410 scopes_pcs_size() +
411 handler_table_size() +
412 nul_chk_table_size();
413 }
414
415 address* nmethod::orig_pc_addr(const frame* fr) {
416 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
417 }
418
419 const char* nmethod::compile_kind() const {
420 if (is_osr_method()) return "osr";
421 if (method() != NULL && is_native_method()) return "c2n";
422 return NULL;
423 }
424
425 // Fill in default values for various flag fields
426 void nmethod::init_defaults() {
427 _state = not_installed;
428 _has_flushed_dependencies = 0;
429 _lock_count = 0;
430 _stack_traversal_mark = 0;
431 _unload_reported = false; // jvmti state
432 _is_far_code = false; // nmethods are located in CodeCache
433
434 #ifdef ASSERT
435 _oops_are_stale = false;
436 #endif
437
438 _oops_do_mark_link = NULL;
439 _jmethod_id = NULL;
440 _osr_link = NULL;
441 #if INCLUDE_RTM_OPT
442 _rtm_state = NoRTM;
443 #endif
444 }
445
446 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
447 int compile_id,
448 CodeBuffer *code_buffer,
449 int vep_offset,
450 int frame_complete,
451 int frame_size,
452 ByteSize basic_lock_owner_sp_offset,
453 ByteSize basic_lock_sp_offset,
454 OopMapSet* oop_maps) {
455 code_buffer->finalize_oop_references(method);
456 // create nmethod
457 nmethod* nm = NULL;
458 {
459 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
460 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
461
462 CodeOffsets offsets;
463 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
464 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
465 nm = new (native_nmethod_size, CompLevel_none)
466 nmethod(method(), compiler_none, native_nmethod_size,
467 compile_id, &offsets,
468 code_buffer, frame_size,
469 basic_lock_owner_sp_offset,
470 basic_lock_sp_offset,
471 oop_maps);
472 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
473 }
474
475 if (nm != NULL) {
476 // verify nmethod
477 debug_only(nm->verify();) // might block
478
479 nm->log_new_nmethod();
480 nm->make_in_use();
481 }
482 return nm;
483 }
484
485 nmethod* nmethod::new_nmethod(const methodHandle& method,
486 int compile_id,
487 int entry_bci,
488 CodeOffsets* offsets,
489 int orig_pc_offset,
490 DebugInformationRecorder* debug_info,
491 Dependencies* dependencies,
492 CodeBuffer* code_buffer, int frame_size,
493 OopMapSet* oop_maps,
494 ExceptionHandlerTable* handler_table,
495 ImplicitExceptionTable* nul_chk_table,
496 AbstractCompiler* compiler,
497 int comp_level
498 #if INCLUDE_JVMCI
499 , char* speculations,
500 int speculations_len,
501 int nmethod_mirror_index,
502 const char* nmethod_mirror_name,
503 FailedSpeculation** failed_speculations
504 #endif
505 )
506 {
507 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
508 code_buffer->finalize_oop_references(method);
509 // create nmethod
510 nmethod* nm = NULL;
511 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
512 #if INCLUDE_JVMCI
513 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
514 #endif
515 int nmethod_size =
516 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
517 + adjust_pcs_size(debug_info->pcs_size())
518 + align_up((int)dependencies->size_in_bytes(), oopSize)
519 + align_up(handler_table->size_in_bytes() , oopSize)
520 + align_up(nul_chk_table->size_in_bytes() , oopSize)
521 #if INCLUDE_JVMCI
522 + align_up(speculations_len , oopSize)
523 + align_up(jvmci_data_size , oopSize)
524 #endif
525 + align_up(debug_info->data_size() , oopSize);
526
527 nm = new (nmethod_size, comp_level)
528 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
529 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
530 oop_maps,
531 handler_table,
532 nul_chk_table,
533 compiler,
534 comp_level
535 #if INCLUDE_JVMCI
536 , speculations,
537 speculations_len,
538 jvmci_data_size
539 #endif
540 );
541
542 if (nm != NULL) {
543 #if INCLUDE_JVMCI
544 if (compiler->is_jvmci()) {
545 // Initialize the JVMCINMethodData object inlined into nm
546 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
547 }
548 #endif
549 // To make dependency checking during class loading fast, record
550 // the nmethod dependencies in the classes it is dependent on.
551 // This allows the dependency checking code to simply walk the
552 // class hierarchy above the loaded class, checking only nmethods
553 // which are dependent on those classes. The slow way is to
554 // check every nmethod for dependencies which makes it linear in
555 // the number of methods compiled. For applications with a lot
556 // classes the slow way is too slow.
557 for (Dependencies::DepStream deps(nm); deps.next(); ) {
558 if (deps.type() == Dependencies::call_site_target_value) {
559 // CallSite dependencies are managed on per-CallSite instance basis.
560 oop call_site = deps.argument_oop(0);
561 MethodHandles::add_dependent_nmethod(call_site, nm);
562 } else {
563 Klass* klass = deps.context_type();
564 if (klass == NULL) {
565 continue; // ignore things like evol_method
566 }
567 // record this nmethod as dependent on this klass
568 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
569 }
570 }
571 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
572 }
573 }
574 // Do verification and logging outside CodeCache_lock.
575 if (nm != NULL) {
576 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
577 DEBUG_ONLY(nm->verify();)
578 nm->log_new_nmethod();
579 }
580 return nm;
581 }
582
583 // For native wrappers
584 nmethod::nmethod(
585 Method* method,
586 CompilerType type,
587 int nmethod_size,
588 int compile_id,
589 CodeOffsets* offsets,
590 CodeBuffer* code_buffer,
591 int frame_size,
592 ByteSize basic_lock_owner_sp_offset,
593 ByteSize basic_lock_sp_offset,
594 OopMapSet* oop_maps )
595 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
596 _is_unloading_state(0),
597 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
598 _native_basic_lock_sp_offset(basic_lock_sp_offset)
599 {
600 {
601 int scopes_data_offset = 0;
602 int deoptimize_offset = 0;
603 int deoptimize_mh_offset = 0;
604
605 debug_only(NoSafepointVerifier nsv;)
606 assert_locked_or_safepoint(CodeCache_lock);
607
608 init_defaults();
609 _entry_bci = InvocationEntryBci;
610 // We have no exception handler or deopt handler make the
611 // values something that will never match a pc like the nmethod vtable entry
612 _exception_offset = 0;
613 _orig_pc_offset = 0;
614
615 _consts_offset = data_offset();
616 _stub_offset = data_offset();
617 _oops_offset = data_offset();
618 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
619 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
620 _scopes_pcs_offset = scopes_data_offset;
621 _dependencies_offset = _scopes_pcs_offset;
622 _handler_table_offset = _dependencies_offset;
623 _nul_chk_table_offset = _handler_table_offset;
624 #if INCLUDE_JVMCI
625 _speculations_offset = _nul_chk_table_offset;
626 _jvmci_data_offset = _speculations_offset;
627 _nmethod_end_offset = _jvmci_data_offset;
628 #else
629 _nmethod_end_offset = _nul_chk_table_offset;
630 #endif
631 _compile_id = compile_id;
632 _comp_level = CompLevel_none;
633 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
634 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
635
636 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields
637 _value_entry_point = _entry_point;
638 _verified_value_entry_point = _verified_entry_point;
639 _verified_value_ro_entry_point = _verified_entry_point;
640
641 _osr_entry_point = NULL;
642 _exception_cache = NULL;
643 _pc_desc_container.reset_to(NULL);
644 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
645
646 _scopes_data_begin = (address) this + scopes_data_offset;
647 _deopt_handler_begin = (address) this + deoptimize_offset;
648 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
649
650 code_buffer->copy_code_and_locs_to(this);
651 code_buffer->copy_values_to(this);
652
653 clear_unloading_state();
654
655 Universe::heap()->register_nmethod(this);
656 debug_only(Universe::heap()->verify_nmethod(this));
657
658 CodeCache::commit(this);
659 }
660
661 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
662 ttyLocker ttyl; // keep the following output all in one block
663 // This output goes directly to the tty, not the compiler log.
664 // To enable tools to match it up with the compilation activity,
665 // be sure to tag this tty output with the compile ID.
666 if (xtty != NULL) {
667 xtty->begin_head("print_native_nmethod");
668 xtty->method(_method);
669 xtty->stamp();
670 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
671 }
672 // Print the header part, then print the requested information.
673 // This is both handled in decode2(), called via print_code() -> decode()
674 if (PrintNativeNMethods) {
675 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
676 print_code();
677 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
678 #if defined(SUPPORT_DATA_STRUCTS)
679 if (AbstractDisassembler::show_structs()) {
680 if (oop_maps != NULL) {
681 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
682 oop_maps->print_on(tty);
683 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
684 }
685 }
686 #endif
687 } else {
688 print(); // print the header part only.
689 }
690 #if defined(SUPPORT_DATA_STRUCTS)
691 if (AbstractDisassembler::show_structs()) {
692 if (PrintRelocations) {
693 print_relocations();
694 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
695 }
696 }
697 #endif
698 if (xtty != NULL) {
699 xtty->tail("print_native_nmethod");
700 }
701 }
702 }
703
704 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
705 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
706 }
707
708 nmethod::nmethod(
709 Method* method,
710 CompilerType type,
711 int nmethod_size,
712 int compile_id,
713 int entry_bci,
714 CodeOffsets* offsets,
715 int orig_pc_offset,
716 DebugInformationRecorder* debug_info,
717 Dependencies* dependencies,
718 CodeBuffer *code_buffer,
719 int frame_size,
720 OopMapSet* oop_maps,
721 ExceptionHandlerTable* handler_table,
722 ImplicitExceptionTable* nul_chk_table,
723 AbstractCompiler* compiler,
724 int comp_level
725 #if INCLUDE_JVMCI
726 , char* speculations,
727 int speculations_len,
728 int jvmci_data_size
729 #endif
730 )
731 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
732 _is_unloading_state(0),
733 _native_receiver_sp_offset(in_ByteSize(-1)),
734 _native_basic_lock_sp_offset(in_ByteSize(-1))
735 {
736 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
737 {
738 debug_only(NoSafepointVerifier nsv;)
739 assert_locked_or_safepoint(CodeCache_lock);
740
741 _deopt_handler_begin = (address) this;
742 _deopt_mh_handler_begin = (address) this;
743
744 init_defaults();
745 _entry_bci = entry_bci;
746 _compile_id = compile_id;
747 _comp_level = comp_level;
748 _orig_pc_offset = orig_pc_offset;
749 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
750
751 // Section offsets
752 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
753 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
754 set_ctable_begin(header_begin() + _consts_offset);
755
756 #if INCLUDE_JVMCI
757 if (compiler->is_jvmci()) {
758 // JVMCI might not produce any stub sections
759 if (offsets->value(CodeOffsets::Exceptions) != -1) {
760 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
761 } else {
762 _exception_offset = -1;
763 }
764 if (offsets->value(CodeOffsets::Deopt) != -1) {
765 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
766 } else {
767 _deopt_handler_begin = NULL;
768 }
769 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
770 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
771 } else {
772 _deopt_mh_handler_begin = NULL;
773 }
774 } else
775 #endif
776 {
777 // Exception handler and deopt handler are in the stub section
778 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
779 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
780
781 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
782 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
783 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
784 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
785 } else {
786 _deopt_mh_handler_begin = NULL;
787 }
788 }
789 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
790 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
791 } else {
792 _unwind_handler_offset = -1;
793 }
794
795 _oops_offset = data_offset();
796 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
797 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
798
799 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
800 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
801 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
802 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
803 #if INCLUDE_JVMCI
804 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
805 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
806 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
807 #else
808 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
809 #endif
810 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
811 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
812 _value_entry_point = code_begin() + offsets->value(CodeOffsets::Value_Entry);
813 _verified_value_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Value_Entry);
814 _verified_value_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Value_Entry_RO);
815 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
816 _exception_cache = NULL;
817 _scopes_data_begin = (address) this + scopes_data_offset;
818
819 _pc_desc_container.reset_to(scopes_pcs_begin());
820
821 code_buffer->copy_code_and_locs_to(this);
822 // Copy contents of ScopeDescRecorder to nmethod
823 code_buffer->copy_values_to(this);
824 debug_info->copy_to(this);
825 dependencies->copy_to(this);
826 clear_unloading_state();
827
828 Universe::heap()->register_nmethod(this);
829 debug_only(Universe::heap()->verify_nmethod(this));
830
831 CodeCache::commit(this);
832
833 // Copy contents of ExceptionHandlerTable to nmethod
834 handler_table->copy_to(this);
835 nul_chk_table->copy_to(this);
836
837 #if INCLUDE_JVMCI
838 // Copy speculations to nmethod
839 if (speculations_size() != 0) {
840 memcpy(speculations_begin(), speculations, speculations_len);
841 }
842 #endif
843
844 // we use the information of entry points to find out if a method is
845 // static or non static
846 assert(compiler->is_c2() || compiler->is_jvmci() ||
847 _method->is_static() == (entry_point() == _verified_entry_point),
848 " entry points must be same for static methods and vice versa");
849 }
850 }
851
852 // Print a short set of xml attributes to identify this nmethod. The
853 // output should be embedded in some other element.
854 void nmethod::log_identity(xmlStream* log) const {
855 log->print(" compile_id='%d'", compile_id());
856 const char* nm_kind = compile_kind();
857 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
858 log->print(" compiler='%s'", compiler_name());
859 if (TieredCompilation) {
860 log->print(" level='%d'", comp_level());
861 }
862 #if INCLUDE_JVMCI
863 if (jvmci_nmethod_data() != NULL) {
864 const char* jvmci_name = jvmci_nmethod_data()->name();
865 if (jvmci_name != NULL) {
866 log->print(" jvmci_mirror_name='");
867 log->text("%s", jvmci_name);
868 log->print("'");
869 }
870 }
871 #endif
872 }
873
874
875 #define LOG_OFFSET(log, name) \
876 if (p2i(name##_end()) - p2i(name##_begin())) \
877 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
878 p2i(name##_begin()) - p2i(this))
879
880
881 void nmethod::log_new_nmethod() const {
882 if (LogCompilation && xtty != NULL) {
883 ttyLocker ttyl;
884 HandleMark hm;
885 xtty->begin_elem("nmethod");
886 log_identity(xtty);
887 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
888 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
889
890 LOG_OFFSET(xtty, relocation);
891 LOG_OFFSET(xtty, consts);
892 LOG_OFFSET(xtty, insts);
893 LOG_OFFSET(xtty, stub);
894 LOG_OFFSET(xtty, scopes_data);
895 LOG_OFFSET(xtty, scopes_pcs);
896 LOG_OFFSET(xtty, dependencies);
897 LOG_OFFSET(xtty, handler_table);
898 LOG_OFFSET(xtty, nul_chk_table);
899 LOG_OFFSET(xtty, oops);
900 LOG_OFFSET(xtty, metadata);
901
902 xtty->method(method());
903 xtty->stamp();
904 xtty->end_elem();
905 }
906 }
907
908 #undef LOG_OFFSET
909
910
911 // Print out more verbose output usually for a newly created nmethod.
912 void nmethod::print_on(outputStream* st, const char* msg) const {
913 if (st != NULL) {
914 ttyLocker ttyl;
915 if (WizardMode) {
916 CompileTask::print(st, this, msg, /*short_form:*/ true);
917 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
918 } else {
919 CompileTask::print(st, this, msg, /*short_form:*/ false);
920 }
921 }
922 }
923
924 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
925 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
926 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
927 print_nmethod(printnmethods);
928 }
929 }
930
931 static nmethod* _nmethod_to_print = NULL;
932 static const CompiledEntrySignature* _nmethod_to_print_ces = NULL;
933
934 void nmethod::print_nmethod(bool printmethod) {
935 ResourceMark rm;
936 CompiledEntrySignature ces(method());
937 ces.compute_calling_conventions();
938 // ces.compute_calling_conventions() needs to grab the ProtectionDomainSet_lock, so we
939 // can't do that (inside nmethod::print_entry_parameters) while holding the ttyLocker.
940 // Hence we have do compute it here and pass via a global. Yuck.
941 ttyLocker ttyl; // keep the following output all in one block
942 assert(_nmethod_to_print == NULL && _nmethod_to_print_ces == NULL, "no nesting");
943 _nmethod_to_print = this;
944 _nmethod_to_print_ces = &ces;
945 if (xtty != NULL) {
946 xtty->begin_head("print_nmethod");
947 log_identity(xtty);
948 xtty->stamp();
949 xtty->end_head();
950 }
951 // Print the header part, then print the requested information.
952 // This is both handled in decode2().
953 if (printmethod) {
954 HandleMark hm;
955 ResourceMark m;
956 if (is_compiled_by_c1()) {
957 tty->cr();
958 tty->print_cr("============================= C1-compiled nmethod ==============================");
959 }
960 if (is_compiled_by_jvmci()) {
961 tty->cr();
962 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
963 }
964 tty->print_cr("----------------------------------- Assembly -----------------------------------");
965 decode2(tty);
966 #if defined(SUPPORT_DATA_STRUCTS)
967 if (AbstractDisassembler::show_structs()) {
968 // Print the oops from the underlying CodeBlob as well.
969 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
970 print_oops(tty);
971 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
972 print_metadata(tty);
973 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
974 print_pcs();
975 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
976 if (oop_maps() != NULL) {
977 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
978 oop_maps()->print_on(tty);
979 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
980 }
981 }
982 #endif
983 } else {
984 print(); // print the header part only.
985 }
986
987 #if defined(SUPPORT_DATA_STRUCTS)
988 if (AbstractDisassembler::show_structs()) {
989 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
990 print_scopes();
991 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
992 }
993 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
994 print_relocations();
995 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
996 }
997 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
998 print_dependencies();
999 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1000 }
1001 if (printmethod || PrintExceptionHandlers) {
1002 print_handler_table();
1003 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1004 print_nul_chk_table();
1005 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1006 }
1007
1008 if (printmethod) {
1009 print_recorded_oops();
1010 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1011 print_recorded_metadata();
1012 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1013 }
1014 }
1015 #endif
1016
1017 if (xtty != NULL) {
1018 xtty->tail("print_nmethod");
1019 }
1020
1021 _nmethod_to_print = NULL;
1022 _nmethod_to_print_ces = NULL;
1023 }
1024
1025
1026 // Promote one word from an assembly-time handle to a live embedded oop.
1027 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1028 if (handle == NULL ||
1029 // As a special case, IC oops are initialized to 1 or -1.
1030 handle == (jobject) Universe::non_oop_word()) {
1031 (*dest) = (oop) handle;
1032 } else {
1033 (*dest) = JNIHandles::resolve_non_null(handle);
1034 }
1035 }
1036
1037
1038 // Have to have the same name because it's called by a template
1039 void nmethod::copy_values(GrowableArray<jobject>* array) {
1040 int length = array->length();
1041 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1042 oop* dest = oops_begin();
1043 for (int index = 0 ; index < length; index++) {
1044 initialize_immediate_oop(&dest[index], array->at(index));
1045 }
1046
1047 // Now we can fix up all the oops in the code. We need to do this
1048 // in the code because the assembler uses jobjects as placeholders.
1049 // The code and relocations have already been initialized by the
1050 // CodeBlob constructor, so it is valid even at this early point to
1051 // iterate over relocations and patch the code.
1052 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1053 }
1054
1055 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1056 int length = array->length();
1057 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1058 Metadata** dest = metadata_begin();
1059 for (int index = 0 ; index < length; index++) {
1060 dest[index] = array->at(index);
1061 }
1062 }
1063
1064 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1065 // re-patch all oop-bearing instructions, just in case some oops moved
1066 RelocIterator iter(this, begin, end);
1067 while (iter.next()) {
1068 if (iter.type() == relocInfo::oop_type) {
1069 oop_Relocation* reloc = iter.oop_reloc();
1070 if (initialize_immediates && reloc->oop_is_immediate()) {
1071 oop* dest = reloc->oop_addr();
1072 initialize_immediate_oop(dest, (jobject) *dest);
1073 }
1074 // Refresh the oop-related bits of this instruction.
1075 reloc->fix_oop_relocation();
1076 } else if (iter.type() == relocInfo::metadata_type) {
1077 metadata_Relocation* reloc = iter.metadata_reloc();
1078 reloc->fix_metadata_relocation();
1079 }
1080 }
1081 }
1082
1083
1084 void nmethod::verify_clean_inline_caches() {
1085 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1086
1087 ResourceMark rm;
1088 RelocIterator iter(this, oops_reloc_begin());
1089 while(iter.next()) {
1090 switch(iter.type()) {
1091 case relocInfo::virtual_call_type:
1092 case relocInfo::opt_virtual_call_type: {
1093 CompiledIC *ic = CompiledIC_at(&iter);
1094 // Ok, to lookup references to zombies here
1095 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1096 assert(cb != NULL, "destination not in CodeBlob?");
1097 nmethod* nm = cb->as_nmethod_or_null();
1098 if( nm != NULL ) {
1099 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1100 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1101 assert(ic->is_clean(), "IC should be clean");
1102 }
1103 }
1104 break;
1105 }
1106 case relocInfo::static_call_type: {
1107 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1108 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1109 assert(cb != NULL, "destination not in CodeBlob?");
1110 nmethod* nm = cb->as_nmethod_or_null();
1111 if( nm != NULL ) {
1112 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1113 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1114 assert(csc->is_clean(), "IC should be clean");
1115 }
1116 }
1117 break;
1118 }
1119 default:
1120 break;
1121 }
1122 }
1123 }
1124
1125 // This is a private interface with the sweeper.
1126 void nmethod::mark_as_seen_on_stack() {
1127 assert(is_alive(), "Must be an alive method");
1128 // Set the traversal mark to ensure that the sweeper does 2
1129 // cleaning passes before moving to zombie.
1130 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1131 }
1132
1133 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1134 // there are no activations on the stack, not in use by the VM,
1135 // and not in use by the ServiceThread)
1136 bool nmethod::can_convert_to_zombie() {
1137 // Note that this is called when the sweeper has observed the nmethod to be
1138 // not_entrant. However, with concurrent code cache unloading, the state
1139 // might have moved on to unloaded if it is_unloading(), due to racing
1140 // concurrent GC threads.
1141 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1142
1143 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1144 // count can be greater than the stack traversal count before it hits the
1145 // nmethod for the second time.
1146 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1147 // convert it to zombie due to GC unloading interactions. However, if it
1148 // has become unloaded, then it is okay to convert such nmethods to zombie.
1149 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1150 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1151 }
1152
1153 void nmethod::inc_decompile_count() {
1154 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1155 // Could be gated by ProfileTraps, but do not bother...
1156 Method* m = method();
1157 if (m == NULL) return;
1158 MethodData* mdo = m->method_data();
1159 if (mdo == NULL) return;
1160 // There is a benign race here. See comments in methodData.hpp.
1161 mdo->inc_decompile_count();
1162 }
1163
1164 void nmethod::make_unloaded() {
1165 post_compiled_method_unload();
1166
1167 // This nmethod is being unloaded, make sure that dependencies
1168 // recorded in instanceKlasses get flushed.
1169 // Since this work is being done during a GC, defer deleting dependencies from the
1170 // InstanceKlass.
1171 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1172 "should only be called during gc");
1173 flush_dependencies(/*delete_immediately*/false);
1174
1175 // Break cycle between nmethod & method
1176 LogTarget(Trace, class, unload, nmethod) lt;
1177 if (lt.is_enabled()) {
1178 LogStream ls(lt);
1179 ls.print("making nmethod " INTPTR_FORMAT
1180 " unloadable, Method*(" INTPTR_FORMAT
1181 ") ",
1182 p2i(this), p2i(_method));
1183 ls.cr();
1184 }
1185 // Unlink the osr method, so we do not look this up again
1186 if (is_osr_method()) {
1187 // Invalidate the osr nmethod only once
1188 if (is_in_use()) {
1189 invalidate_osr_method();
1190 }
1191 #ifdef ASSERT
1192 if (method() != NULL) {
1193 // Make sure osr nmethod is invalidated, i.e. not on the list
1194 bool found = method()->method_holder()->remove_osr_nmethod(this);
1195 assert(!found, "osr nmethod should have been invalidated");
1196 }
1197 #endif
1198 }
1199
1200 // If _method is already NULL the Method* is about to be unloaded,
1201 // so we don't have to break the cycle. Note that it is possible to
1202 // have the Method* live here, in case we unload the nmethod because
1203 // it is pointing to some oop (other than the Method*) being unloaded.
1204 if (_method != NULL) {
1205 _method->unlink_code(this);
1206 }
1207
1208 // Make the class unloaded - i.e., change state and notify sweeper
1209 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1210 "must be at safepoint");
1211
1212 {
1213 // Clear ICStubs and release any CompiledICHolders.
1214 CompiledICLocker ml(this);
1215 clear_ic_callsites();
1216 }
1217
1218 // Unregister must be done before the state change
1219 {
1220 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1221 Mutex::_no_safepoint_check_flag);
1222 Universe::heap()->unregister_nmethod(this);
1223 }
1224
1225 // Clear the method of this dead nmethod
1226 set_method(NULL);
1227
1228 // Log the unloading.
1229 log_state_change();
1230
1231 // The Method* is gone at this point
1232 assert(_method == NULL, "Tautology");
1233
1234 set_osr_link(NULL);
1235 NMethodSweeper::report_state_change(this);
1236
1237 // The release is only needed for compile-time ordering, as accesses
1238 // into the nmethod after the store are not safe due to the sweeper
1239 // being allowed to free it when the store is observed, during
1240 // concurrent nmethod unloading. Therefore, there is no need for
1241 // acquire on the loader side.
1242 OrderAccess::release_store(&_state, (signed char)unloaded);
1243
1244 #if INCLUDE_JVMCI
1245 // Clear the link between this nmethod and a HotSpotNmethod mirror
1246 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1247 if (nmethod_data != NULL) {
1248 nmethod_data->invalidate_nmethod_mirror(this);
1249 nmethod_data->clear_nmethod_mirror(this);
1250 }
1251 #endif
1252 }
1253
1254 void nmethod::invalidate_osr_method() {
1255 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1256 // Remove from list of active nmethods
1257 if (method() != NULL) {
1258 method()->method_holder()->remove_osr_nmethod(this);
1259 }
1260 }
1261
1262 void nmethod::log_state_change() const {
1263 if (LogCompilation) {
1264 if (xtty != NULL) {
1265 ttyLocker ttyl; // keep the following output all in one block
1266 if (_state == unloaded) {
1267 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1268 os::current_thread_id());
1269 } else {
1270 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1271 os::current_thread_id(),
1272 (_state == zombie ? " zombie='1'" : ""));
1273 }
1274 log_identity(xtty);
1275 xtty->stamp();
1276 xtty->end_elem();
1277 }
1278 }
1279
1280 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1281 CompileTask::print_ul(this, state_msg);
1282 if (PrintCompilation && _state != unloaded) {
1283 print_on(tty, state_msg);
1284 }
1285 }
1286
1287 void nmethod::unlink_from_method() {
1288 if (method() != NULL) {
1289 method()->unlink_code(this);
1290 }
1291 }
1292
1293 /**
1294 * Common functionality for both make_not_entrant and make_zombie
1295 */
1296 bool nmethod::make_not_entrant_or_zombie(int state) {
1297 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1298 assert(!is_zombie(), "should not already be a zombie");
1299
1300 if (_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 neither the nmethod nor the method is flushed in case of a safepoint in code below.
1309 nmethodLocker nml(this);
1310 methodHandle the_method(method());
1311 // This can be called while the system is already at a safepoint which is ok
1312 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1313
1314 // during patching, depending on the nmethod state we must notify the GC that
1315 // code has been unloaded, unregistering it. We cannot do this right while
1316 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1317 // would be prone to deadlocks.
1318 // This flag is used to remember whether we need to later lock and unregister.
1319 bool nmethod_needs_unregister = false;
1320
1321 // invalidate osr nmethod before acquiring the patching lock since
1322 // they both acquire leaf locks and we don't want a deadlock.
1323 // This logic is equivalent to the logic below for patching the
1324 // verified entry point of regular methods. We check that the
1325 // nmethod is in use to ensure that it is invalidated only once.
1326 if (is_osr_method() && is_in_use()) {
1327 // this effectively makes the osr nmethod not entrant
1328 invalidate_osr_method();
1329 }
1330
1331 {
1332 // Enter critical section. Does not block for safepoint.
1333 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1334
1335 if (_state == state) {
1336 // another thread already performed this transition so nothing
1337 // to do, but return false to indicate this.
1338 return false;
1339 }
1340
1341 // The caller can be calling the method statically or through an inline
1342 // cache call.
1343 if (!is_osr_method() && !is_not_entrant()) {
1344 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1345 SharedRuntime::get_handle_wrong_method_stub());
1346 }
1347
1348 if (is_in_use() && update_recompile_counts()) {
1349 // It's a true state change, so mark the method as decompiled.
1350 // Do it only for transition from alive.
1351 inc_decompile_count();
1352 }
1353
1354 // If the state is becoming a zombie, signal to unregister the nmethod with
1355 // the heap.
1356 // This nmethod may have already been unloaded during a full GC.
1357 if ((state == zombie) && !is_unloaded()) {
1358 nmethod_needs_unregister = true;
1359 }
1360
1361 // Must happen before state change. Otherwise we have a race condition in
1362 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1363 // transition its state from 'not_entrant' to 'zombie' without having to wait
1364 // for stack scanning.
1365 if (state == not_entrant) {
1366 mark_as_seen_on_stack();
1367 OrderAccess::storestore(); // _stack_traversal_mark and _state
1368 }
1369
1370 // Change state
1371 _state = state;
1372
1373 // Log the transition once
1374 log_state_change();
1375
1376 // Remove nmethod from method.
1377 unlink_from_method();
1378
1379 } // leave critical region under CompiledMethod_lock
1380
1381 #if INCLUDE_JVMCI
1382 // Invalidate can't occur while holding the Patching lock
1383 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1384 if (nmethod_data != NULL) {
1385 nmethod_data->invalidate_nmethod_mirror(this);
1386 }
1387 #endif
1388
1389 #ifdef ASSERT
1390 if (is_osr_method() && method() != NULL) {
1391 // Make sure osr nmethod is invalidated, i.e. not on the list
1392 bool found = method()->method_holder()->remove_osr_nmethod(this);
1393 assert(!found, "osr nmethod should have been invalidated");
1394 }
1395 #endif
1396
1397 // When the nmethod becomes zombie it is no longer alive so the
1398 // dependencies must be flushed. nmethods in the not_entrant
1399 // state will be flushed later when the transition to zombie
1400 // happens or they get unloaded.
1401 if (state == zombie) {
1402 {
1403 // Flushing dependencies must be done before any possible
1404 // safepoint can sneak in, otherwise the oops used by the
1405 // dependency logic could have become stale.
1406 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1407 if (nmethod_needs_unregister) {
1408 Universe::heap()->unregister_nmethod(this);
1409 }
1410 flush_dependencies(/*delete_immediately*/true);
1411 }
1412
1413 #if INCLUDE_JVMCI
1414 // Now that the nmethod has been unregistered, it's
1415 // safe to clear the HotSpotNmethod mirror oop.
1416 if (nmethod_data != NULL) {
1417 nmethod_data->clear_nmethod_mirror(this);
1418 }
1419 #endif
1420
1421 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1422 // nmethods during the next safepoint (see ICStub::finalize), as well
1423 // as to free up CompiledICHolder resources.
1424 {
1425 CompiledICLocker ml(this);
1426 clear_ic_callsites();
1427 }
1428
1429 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1430 // event and it hasn't already been reported for this nmethod then
1431 // report it now. The event may have been reported earlier if the GC
1432 // marked it for unloading). JvmtiDeferredEventQueue support means
1433 // we no longer go to a safepoint here.
1434 post_compiled_method_unload();
1435
1436 #ifdef ASSERT
1437 // It's no longer safe to access the oops section since zombie
1438 // nmethods aren't scanned for GC.
1439 _oops_are_stale = true;
1440 #endif
1441 // the Method may be reclaimed by class unloading now that the
1442 // nmethod is in zombie state
1443 set_method(NULL);
1444 } else {
1445 assert(state == not_entrant, "other cases may need to be handled differently");
1446 }
1447
1448 if (TraceCreateZombies && state == zombie) {
1449 ResourceMark m;
1450 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");
1451 }
1452
1453 NMethodSweeper::report_state_change(this);
1454 return true;
1455 }
1456
1457 void nmethod::flush() {
1458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1459 // Note that there are no valid oops in the nmethod anymore.
1460 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1461 "osr nmethod must be unloaded or zombie before flushing");
1462 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1463 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1464 assert_locked_or_safepoint(CodeCache_lock);
1465
1466 // completely deallocate this method
1467 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1468 if (PrintMethodFlushing) {
1469 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1470 "/Free CodeCache:" SIZE_FORMAT "Kb",
1471 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1472 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1473 }
1474
1475 // We need to deallocate any ExceptionCache data.
1476 // Note that we do not need to grab the nmethod lock for this, it
1477 // better be thread safe if we're disposing of it!
1478 ExceptionCache* ec = exception_cache();
1479 set_exception_cache(NULL);
1480 while(ec != NULL) {
1481 ExceptionCache* next = ec->next();
1482 delete ec;
1483 ec = next;
1484 }
1485
1486 Universe::heap()->flush_nmethod(this);
1487 CodeCache::unregister_old_nmethod(this);
1488
1489 CodeBlob::flush();
1490 CodeCache::free(this);
1491 }
1492
1493 oop nmethod::oop_at(int index) const {
1494 if (index == 0) {
1495 return NULL;
1496 }
1497 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1498 }
1499
1500 //
1501 // Notify all classes this nmethod is dependent on that it is no
1502 // longer dependent. This should only be called in two situations.
1503 // First, when a nmethod transitions to a zombie all dependents need
1504 // to be clear. Since zombification happens at a safepoint there's no
1505 // synchronization issues. The second place is a little more tricky.
1506 // During phase 1 of mark sweep class unloading may happen and as a
1507 // result some nmethods may get unloaded. In this case the flushing
1508 // of dependencies must happen during phase 1 since after GC any
1509 // dependencies in the unloaded nmethod won't be updated, so
1510 // traversing the dependency information in unsafe. In that case this
1511 // function is called with a boolean argument and this function only
1512 // notifies instanceKlasses that are reachable
1513
1514 void nmethod::flush_dependencies(bool delete_immediately) {
1515 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1516 assert(called_by_gc != delete_immediately,
1517 "delete_immediately is false if and only if we are called during GC");
1518 if (!has_flushed_dependencies()) {
1519 set_has_flushed_dependencies();
1520 for (Dependencies::DepStream deps(this); deps.next(); ) {
1521 if (deps.type() == Dependencies::call_site_target_value) {
1522 // CallSite dependencies are managed on per-CallSite instance basis.
1523 oop call_site = deps.argument_oop(0);
1524 if (delete_immediately) {
1525 assert_locked_or_safepoint(CodeCache_lock);
1526 MethodHandles::remove_dependent_nmethod(call_site, this);
1527 } else {
1528 MethodHandles::clean_dependency_context(call_site);
1529 }
1530 } else {
1531 Klass* klass = deps.context_type();
1532 if (klass == NULL) {
1533 continue; // ignore things like evol_method
1534 }
1535 // During GC delete_immediately is false, and liveness
1536 // of dependee determines class that needs to be updated.
1537 if (delete_immediately) {
1538 assert_locked_or_safepoint(CodeCache_lock);
1539 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1540 } else if (klass->is_loader_alive()) {
1541 // The GC may clean dependency contexts concurrently and in parallel.
1542 InstanceKlass::cast(klass)->clean_dependency_context();
1543 }
1544 }
1545 }
1546 }
1547 }
1548
1549 // ------------------------------------------------------------------
1550 // post_compiled_method_load_event
1551 // new method for install_code() path
1552 // Transfer information from compilation to jvmti
1553 void nmethod::post_compiled_method_load_event() {
1554
1555 Method* moop = method();
1556 HOTSPOT_COMPILED_METHOD_LOAD(
1557 (char *) moop->klass_name()->bytes(),
1558 moop->klass_name()->utf8_length(),
1559 (char *) moop->name()->bytes(),
1560 moop->name()->utf8_length(),
1561 (char *) moop->signature()->bytes(),
1562 moop->signature()->utf8_length(),
1563 insts_begin(), insts_size());
1564
1565 if (JvmtiExport::should_post_compiled_method_load() ||
1566 JvmtiExport::should_post_compiled_method_unload()) {
1567 get_and_cache_jmethod_id();
1568 }
1569
1570 if (JvmtiExport::should_post_compiled_method_load()) {
1571 // Let the Service thread (which is a real Java thread) post the event
1572 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1573 JvmtiDeferredEventQueue::enqueue(
1574 JvmtiDeferredEvent::compiled_method_load_event(this));
1575 }
1576 }
1577
1578 jmethodID nmethod::get_and_cache_jmethod_id() {
1579 if (_jmethod_id == NULL) {
1580 // Cache the jmethod_id since it can no longer be looked up once the
1581 // method itself has been marked for unloading.
1582 _jmethod_id = method()->jmethod_id();
1583 }
1584 return _jmethod_id;
1585 }
1586
1587 void nmethod::post_compiled_method_unload() {
1588 if (unload_reported()) {
1589 // During unloading we transition to unloaded and then to zombie
1590 // and the unloading is reported during the first transition.
1591 return;
1592 }
1593
1594 assert(_method != NULL && !is_unloaded(), "just checking");
1595 DTRACE_METHOD_UNLOAD_PROBE(method());
1596
1597 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1598 // post the event. Sometime later this nmethod will be made a zombie
1599 // by the sweeper but the Method* will not be valid at that point.
1600 // If the _jmethod_id is null then no load event was ever requested
1601 // so don't bother posting the unload. The main reason for this is
1602 // that the jmethodID is a weak reference to the Method* so if
1603 // it's being unloaded there's no way to look it up since the weak
1604 // ref will have been cleared.
1605 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1606 assert(!unload_reported(), "already unloaded");
1607 JvmtiDeferredEvent event =
1608 JvmtiDeferredEvent::compiled_method_unload_event(this,
1609 _jmethod_id, insts_begin());
1610 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1611 JvmtiDeferredEventQueue::enqueue(event);
1612 }
1613
1614 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1615 // any time. As the nmethod is being unloaded now we mark it has
1616 // having the unload event reported - this will ensure that we don't
1617 // attempt to report the event in the unlikely scenario where the
1618 // event is enabled at the time the nmethod is made a zombie.
1619 set_unload_reported();
1620 }
1621
1622 // Iterate over metadata calling this function. Used by RedefineClasses
1623 void nmethod::metadata_do(MetadataClosure* f) {
1624 {
1625 // Visit all immediate references that are embedded in the instruction stream.
1626 RelocIterator iter(this, oops_reloc_begin());
1627 while (iter.next()) {
1628 if (iter.type() == relocInfo::metadata_type) {
1629 metadata_Relocation* r = iter.metadata_reloc();
1630 // In this metadata, we must only follow those metadatas directly embedded in
1631 // the code. Other metadatas (oop_index>0) are seen as part of
1632 // the metadata section below.
1633 assert(1 == (r->metadata_is_immediate()) +
1634 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1635 "metadata must be found in exactly one place");
1636 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1637 Metadata* md = r->metadata_value();
1638 if (md != _method) f->do_metadata(md);
1639 }
1640 } else if (iter.type() == relocInfo::virtual_call_type) {
1641 // Check compiledIC holders associated with this nmethod
1642 ResourceMark rm;
1643 CompiledIC *ic = CompiledIC_at(&iter);
1644 if (ic->is_icholder_call()) {
1645 CompiledICHolder* cichk = ic->cached_icholder();
1646 f->do_metadata(cichk->holder_metadata());
1647 f->do_metadata(cichk->holder_klass());
1648 } else {
1649 Metadata* ic_oop = ic->cached_metadata();
1650 if (ic_oop != NULL) {
1651 f->do_metadata(ic_oop);
1652 }
1653 }
1654 }
1655 }
1656 }
1657
1658 // Visit the metadata section
1659 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1660 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1661 Metadata* md = *p;
1662 f->do_metadata(md);
1663 }
1664
1665 // Visit metadata not embedded in the other places.
1666 if (_method != NULL) f->do_metadata(_method);
1667 }
1668
1669 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1670 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1671 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1672 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1673 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1674
1675 class IsUnloadingState: public AllStatic {
1676 static const uint8_t _is_unloading_mask = 1;
1677 static const uint8_t _is_unloading_shift = 0;
1678 static const uint8_t _unloading_cycle_mask = 6;
1679 static const uint8_t _unloading_cycle_shift = 1;
1680
1681 static uint8_t set_is_unloading(uint8_t state, bool value) {
1682 state &= ~_is_unloading_mask;
1683 if (value) {
1684 state |= 1 << _is_unloading_shift;
1685 }
1686 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1687 return state;
1688 }
1689
1690 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1691 state &= ~_unloading_cycle_mask;
1692 state |= value << _unloading_cycle_shift;
1693 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1694 return state;
1695 }
1696
1697 public:
1698 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1699 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1700
1701 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1702 uint8_t state = 0;
1703 state = set_is_unloading(state, is_unloading);
1704 state = set_unloading_cycle(state, unloading_cycle);
1705 return state;
1706 }
1707 };
1708
1709 bool nmethod::is_unloading() {
1710 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1711 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1712 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1713 if (state_is_unloading) {
1714 return true;
1715 }
1716 uint8_t current_cycle = CodeCache::unloading_cycle();
1717 if (state_unloading_cycle == current_cycle) {
1718 return false;
1719 }
1720
1721 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1722 // oops in the CompiledMethod, by calling oops_do on it.
1723 state_unloading_cycle = current_cycle;
1724
1725 if (is_zombie()) {
1726 // Zombies without calculated unloading epoch are never unloading due to GC.
1727
1728 // There are no races where a previously observed is_unloading() nmethod
1729 // suddenly becomes not is_unloading() due to here being observed as zombie.
1730
1731 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1732 // and unloaded in the safepoint. That makes races where an nmethod is first
1733 // observed as is_alive() && is_unloading() and subsequently observed as
1734 // is_zombie() impossible.
1735
1736 // With concurrent unloading, all references to is_unloading() nmethods are
1737 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1738 // handshake operation is performed with all JavaThreads before finally
1739 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1740 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1741 // the global handshake, it is impossible for is_unloading() nmethods to
1742 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1743 // nmethods before taking that global handshake, meaning that it will never
1744 // be recalculated after the handshake.
1745
1746 // After that global handshake, is_unloading() nmethods are only observable
1747 // to the iterators, and they will never trigger recomputation of the cached
1748 // is_unloading_state, and hence may not suffer from such races.
1749
1750 state_is_unloading = false;
1751 } else {
1752 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1753 }
1754
1755 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1756
1757 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1758
1759 return state_is_unloading;
1760 }
1761
1762 void nmethod::clear_unloading_state() {
1763 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1764 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1765 }
1766
1767
1768 // This is called at the end of the strong tracing/marking phase of a
1769 // GC to unload an nmethod if it contains otherwise unreachable
1770 // oops.
1771
1772 void nmethod::do_unloading(bool unloading_occurred) {
1773 // Make sure the oop's ready to receive visitors
1774 assert(!is_zombie() && !is_unloaded(),
1775 "should not call follow on zombie or unloaded nmethod");
1776
1777 if (is_unloading()) {
1778 make_unloaded();
1779 } else {
1780 guarantee(unload_nmethod_caches(unloading_occurred),
1781 "Should not need transition stubs");
1782 }
1783 }
1784
1785 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1786 // make sure the oops ready to receive visitors
1787 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1788 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1789
1790 // Prevent extra code cache walk for platforms that don't have immediate oops.
1791 if (relocInfo::mustIterateImmediateOopsInCode()) {
1792 RelocIterator iter(this, oops_reloc_begin());
1793
1794 while (iter.next()) {
1795 if (iter.type() == relocInfo::oop_type ) {
1796 oop_Relocation* r = iter.oop_reloc();
1797 // In this loop, we must only follow those oops directly embedded in
1798 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1799 assert(1 == (r->oop_is_immediate()) +
1800 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1801 "oop must be found in exactly one place");
1802 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1803 f->do_oop(r->oop_addr());
1804 }
1805 }
1806 }
1807 }
1808
1809 // Scopes
1810 // This includes oop constants not inlined in the code stream.
1811 for (oop* p = oops_begin(); p < oops_end(); p++) {
1812 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1813 f->do_oop(p);
1814 }
1815 }
1816
1817 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1818
1819 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1820
1821 // An nmethod is "marked" if its _mark_link is set non-null.
1822 // Even if it is the end of the linked list, it will have a non-null link value,
1823 // as long as it is on the list.
1824 // This code must be MP safe, because it is used from parallel GC passes.
1825 bool nmethod::test_set_oops_do_mark() {
1826 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1827 if (_oops_do_mark_link == NULL) {
1828 // Claim this nmethod for this thread to mark.
1829 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1830 // Atomically append this nmethod (now claimed) to the head of the list:
1831 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1832 for (;;) {
1833 nmethod* required_mark_nmethods = observed_mark_nmethods;
1834 _oops_do_mark_link = required_mark_nmethods;
1835 observed_mark_nmethods =
1836 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1837 if (observed_mark_nmethods == required_mark_nmethods)
1838 break;
1839 }
1840 // Mark was clear when we first saw this guy.
1841 LogTarget(Trace, gc, nmethod) lt;
1842 if (lt.is_enabled()) {
1843 LogStream ls(lt);
1844 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1845 }
1846 return false;
1847 }
1848 }
1849 // On fall through, another racing thread marked this nmethod before we did.
1850 return true;
1851 }
1852
1853 void nmethod::oops_do_marking_prologue() {
1854 log_trace(gc, nmethod)("oops_do_marking_prologue");
1855 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1856 // We use cmpxchg instead of regular assignment here because the user
1857 // may fork a bunch of threads, and we need them all to see the same state.
1858 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1859 guarantee(observed == NULL, "no races in this sequential code");
1860 }
1861
1862 void nmethod::oops_do_marking_epilogue() {
1863 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1864 nmethod* cur = _oops_do_mark_nmethods;
1865 while (cur != NMETHOD_SENTINEL) {
1866 assert(cur != NULL, "not NULL-terminated");
1867 nmethod* next = cur->_oops_do_mark_link;
1868 cur->_oops_do_mark_link = NULL;
1869 DEBUG_ONLY(cur->verify_oop_relocations());
1870
1871 LogTarget(Trace, gc, nmethod) lt;
1872 if (lt.is_enabled()) {
1873 LogStream ls(lt);
1874 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1875 }
1876 cur = next;
1877 }
1878 nmethod* required = _oops_do_mark_nmethods;
1879 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1880 guarantee(observed == required, "no races in this sequential code");
1881 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1882 }
1883
1884 inline bool includes(void* p, void* from, void* to) {
1885 return from <= p && p < to;
1886 }
1887
1888
1889 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1890 assert(count >= 2, "must be sentinel values, at least");
1891
1892 #ifdef ASSERT
1893 // must be sorted and unique; we do a binary search in find_pc_desc()
1894 int prev_offset = pcs[0].pc_offset();
1895 assert(prev_offset == PcDesc::lower_offset_limit,
1896 "must start with a sentinel");
1897 for (int i = 1; i < count; i++) {
1898 int this_offset = pcs[i].pc_offset();
1899 assert(this_offset > prev_offset, "offsets must be sorted");
1900 prev_offset = this_offset;
1901 }
1902 assert(prev_offset == PcDesc::upper_offset_limit,
1903 "must end with a sentinel");
1904 #endif //ASSERT
1905
1906 // Search for MethodHandle invokes and tag the nmethod.
1907 for (int i = 0; i < count; i++) {
1908 if (pcs[i].is_method_handle_invoke()) {
1909 set_has_method_handle_invokes(true);
1910 break;
1911 }
1912 }
1913 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1914
1915 int size = count * sizeof(PcDesc);
1916 assert(scopes_pcs_size() >= size, "oob");
1917 memcpy(scopes_pcs_begin(), pcs, size);
1918
1919 // Adjust the final sentinel downward.
1920 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1921 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1922 last_pc->set_pc_offset(content_size() + 1);
1923 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1924 // Fill any rounding gaps with copies of the last record.
1925 last_pc[1] = last_pc[0];
1926 }
1927 // The following assert could fail if sizeof(PcDesc) is not
1928 // an integral multiple of oopSize (the rounding term).
1929 // If it fails, change the logic to always allocate a multiple
1930 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1931 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1932 }
1933
1934 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1935 assert(scopes_data_size() >= size, "oob");
1936 memcpy(scopes_data_begin(), buffer, size);
1937 }
1938
1939 #ifdef ASSERT
1940 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1941 PcDesc* lower = search.scopes_pcs_begin();
1942 PcDesc* upper = search.scopes_pcs_end();
1943 lower += 1; // exclude initial sentinel
1944 PcDesc* res = NULL;
1945 for (PcDesc* p = lower; p < upper; p++) {
1946 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1947 if (match_desc(p, pc_offset, approximate)) {
1948 if (res == NULL)
1949 res = p;
1950 else
1951 res = (PcDesc*) badAddress;
1952 }
1953 }
1954 return res;
1955 }
1956 #endif
1957
1958
1959 // Finds a PcDesc with real-pc equal to "pc"
1960 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1961 address base_address = search.code_begin();
1962 if ((pc < base_address) ||
1963 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1964 return NULL; // PC is wildly out of range
1965 }
1966 int pc_offset = (int) (pc - base_address);
1967
1968 // Check the PcDesc cache if it contains the desired PcDesc
1969 // (This as an almost 100% hit rate.)
1970 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1971 if (res != NULL) {
1972 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1973 return res;
1974 }
1975
1976 // Fallback algorithm: quasi-linear search for the PcDesc
1977 // Find the last pc_offset less than the given offset.
1978 // The successor must be the required match, if there is a match at all.
1979 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1980 PcDesc* lower = search.scopes_pcs_begin();
1981 PcDesc* upper = search.scopes_pcs_end();
1982 upper -= 1; // exclude final sentinel
1983 if (lower >= upper) return NULL; // native method; no PcDescs at all
1984
1985 #define assert_LU_OK \
1986 /* invariant on lower..upper during the following search: */ \
1987 assert(lower->pc_offset() < pc_offset, "sanity"); \
1988 assert(upper->pc_offset() >= pc_offset, "sanity")
1989 assert_LU_OK;
1990
1991 // Use the last successful return as a split point.
1992 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1993 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1994 if (mid->pc_offset() < pc_offset) {
1995 lower = mid;
1996 } else {
1997 upper = mid;
1998 }
1999
2000 // Take giant steps at first (4096, then 256, then 16, then 1)
2001 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2002 const int RADIX = (1 << LOG2_RADIX);
2003 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2004 while ((mid = lower + step) < upper) {
2005 assert_LU_OK;
2006 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2007 if (mid->pc_offset() < pc_offset) {
2008 lower = mid;
2009 } else {
2010 upper = mid;
2011 break;
2012 }
2013 }
2014 assert_LU_OK;
2015 }
2016
2017 // Sneak up on the value with a linear search of length ~16.
2018 while (true) {
2019 assert_LU_OK;
2020 mid = lower + 1;
2021 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2022 if (mid->pc_offset() < pc_offset) {
2023 lower = mid;
2024 } else {
2025 upper = mid;
2026 break;
2027 }
2028 }
2029 #undef assert_LU_OK
2030
2031 if (match_desc(upper, pc_offset, approximate)) {
2032 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2033 _pc_desc_cache.add_pc_desc(upper);
2034 return upper;
2035 } else {
2036 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2037 return NULL;
2038 }
2039 }
2040
2041
2042 void nmethod::check_all_dependencies(DepChange& changes) {
2043 // Checked dependencies are allocated into this ResourceMark
2044 ResourceMark rm;
2045
2046 // Turn off dependency tracing while actually testing dependencies.
2047 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2048
2049 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2050 &DependencySignature::equals, 11027> DepTable;
2051
2052 DepTable* table = new DepTable();
2053
2054 // Iterate over live nmethods and check dependencies of all nmethods that are not
2055 // marked for deoptimization. A particular dependency is only checked once.
2056 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2057 while(iter.next()) {
2058 nmethod* nm = iter.method();
2059 // Only notify for live nmethods
2060 if (!nm->is_marked_for_deoptimization()) {
2061 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2062 // Construct abstraction of a dependency.
2063 DependencySignature* current_sig = new DependencySignature(deps);
2064
2065 // Determine if dependency is already checked. table->put(...) returns
2066 // 'true' if the dependency is added (i.e., was not in the hashtable).
2067 if (table->put(*current_sig, 1)) {
2068 if (deps.check_dependency() != NULL) {
2069 // Dependency checking failed. Print out information about the failed
2070 // dependency and finally fail with an assert. We can fail here, since
2071 // dependency checking is never done in a product build.
2072 tty->print_cr("Failed dependency:");
2073 changes.print();
2074 nm->print();
2075 nm->print_dependencies();
2076 assert(false, "Should have been marked for deoptimization");
2077 }
2078 }
2079 }
2080 }
2081 }
2082 }
2083
2084 bool nmethod::check_dependency_on(DepChange& changes) {
2085 // What has happened:
2086 // 1) a new class dependee has been added
2087 // 2) dependee and all its super classes have been marked
2088 bool found_check = false; // set true if we are upset
2089 for (Dependencies::DepStream deps(this); deps.next(); ) {
2090 // Evaluate only relevant dependencies.
2091 if (deps.spot_check_dependency_at(changes) != NULL) {
2092 found_check = true;
2093 NOT_DEBUG(break);
2094 }
2095 }
2096 return found_check;
2097 }
2098
2099 // Called from mark_for_deoptimization, when dependee is invalidated.
2100 bool nmethod::is_dependent_on_method(Method* dependee) {
2101 for (Dependencies::DepStream deps(this); deps.next(); ) {
2102 if (deps.type() != Dependencies::evol_method)
2103 continue;
2104 Method* method = deps.method_argument(0);
2105 if (method == dependee) return true;
2106 }
2107 return false;
2108 }
2109
2110
2111 bool nmethod::is_patchable_at(address instr_addr) {
2112 assert(insts_contains(instr_addr), "wrong nmethod used");
2113 if (is_zombie()) {
2114 // a zombie may never be patched
2115 return false;
2116 }
2117 return true;
2118 }
2119
2120
2121 void nmethod_init() {
2122 // make sure you didn't forget to adjust the filler fields
2123 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2124 }
2125
2126
2127 //-------------------------------------------------------------------------------------------
2128
2129
2130 // QQQ might we make this work from a frame??
2131 nmethodLocker::nmethodLocker(address pc) {
2132 CodeBlob* cb = CodeCache::find_blob(pc);
2133 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2134 _nm = cb->as_compiled_method();
2135 lock_nmethod(_nm);
2136 }
2137
2138 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2139 // should pass zombie_ok == true.
2140 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2141 if (cm == NULL) return;
2142 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2143 nmethod* nm = cm->as_nmethod();
2144 Atomic::inc(&nm->_lock_count);
2145 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2146 }
2147
2148 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2149 if (cm == NULL) return;
2150 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2151 nmethod* nm = cm->as_nmethod();
2152 Atomic::dec(&nm->_lock_count);
2153 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2154 }
2155
2156
2157 // -----------------------------------------------------------------------------
2158 // Verification
2159
2160 class VerifyOopsClosure: public OopClosure {
2161 nmethod* _nm;
2162 bool _ok;
2163 public:
2164 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2165 bool ok() { return _ok; }
2166 virtual void do_oop(oop* p) {
2167 if (oopDesc::is_oop_or_null(*p)) return;
2168 // Print diagnostic information before calling print_nmethod().
2169 // Assertions therein might prevent call from returning.
2170 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2171 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2172 if (_ok) {
2173 _nm->print_nmethod(true);
2174 _ok = false;
2175 }
2176 }
2177 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2178 };
2179
2180 void nmethod::verify() {
2181
2182 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2183 // seems odd.
2184
2185 if (is_zombie() || is_not_entrant() || is_unloaded())
2186 return;
2187
2188 // Make sure all the entry points are correctly aligned for patching.
2189 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2190
2191 // assert(oopDesc::is_oop(method()), "must be valid");
2192
2193 ResourceMark rm;
2194
2195 if (!CodeCache::contains(this)) {
2196 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2197 }
2198
2199 if(is_native_method() )
2200 return;
2201
2202 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2203 if (nm != this) {
2204 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2205 }
2206
2207 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2208 if (! p->verify(this)) {
2209 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2210 }
2211 }
2212
2213 #ifdef ASSERT
2214 #if INCLUDE_JVMCI
2215 {
2216 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2217 ImmutableOopMapSet* oms = oop_maps();
2218 ImplicitExceptionTable implicit_table(this);
2219 for (uint i = 0; i < implicit_table.len(); i++) {
2220 int exec_offset = (int) implicit_table.get_exec_offset(i);
2221 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2222 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2223 bool found = false;
2224 for (int i = 0, imax = oms->count(); i < imax; i++) {
2225 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2226 found = true;
2227 break;
2228 }
2229 }
2230 assert(found, "missing oopmap");
2231 }
2232 }
2233 }
2234 #endif
2235 #endif
2236
2237 VerifyOopsClosure voc(this);
2238 oops_do(&voc);
2239 assert(voc.ok(), "embedded oops must be OK");
2240 Universe::heap()->verify_nmethod(this);
2241
2242 verify_scopes();
2243 }
2244
2245
2246 void nmethod::verify_interrupt_point(address call_site) {
2247 // Verify IC only when nmethod installation is finished.
2248 if (!is_not_installed()) {
2249 if (CompiledICLocker::is_safe(this)) {
2250 CompiledIC_at(this, call_site);
2251 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2252 } else {
2253 CompiledICLocker ml_verify(this);
2254 CompiledIC_at(this, call_site);
2255 }
2256 }
2257
2258 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2259 assert(pd != NULL, "PcDesc must exist");
2260 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2261 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2262 pd->return_oop(), pd->return_vt());
2263 !sd->is_top(); sd = sd->sender()) {
2264 sd->verify();
2265 }
2266 }
2267
2268 void nmethod::verify_scopes() {
2269 if( !method() ) return; // Runtime stubs have no scope
2270 if (method()->is_native()) return; // Ignore stub methods.
2271 // iterate through all interrupt point
2272 // and verify the debug information is valid.
2273 RelocIterator iter((nmethod*)this);
2274 while (iter.next()) {
2275 address stub = NULL;
2276 switch (iter.type()) {
2277 case relocInfo::virtual_call_type:
2278 verify_interrupt_point(iter.addr());
2279 break;
2280 case relocInfo::opt_virtual_call_type:
2281 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2282 verify_interrupt_point(iter.addr());
2283 break;
2284 case relocInfo::static_call_type:
2285 stub = iter.static_call_reloc()->static_stub(false);
2286 //verify_interrupt_point(iter.addr());
2287 break;
2288 case relocInfo::runtime_call_type:
2289 case relocInfo::runtime_call_w_cp_type: {
2290 address destination = iter.reloc()->value();
2291 // Right now there is no way to find out which entries support
2292 // an interrupt point. It would be nice if we had this
2293 // information in a table.
2294 break;
2295 }
2296 default:
2297 break;
2298 }
2299 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2300 }
2301 }
2302
2303
2304 // -----------------------------------------------------------------------------
2305 // Printing operations
2306
2307 void nmethod::print() const {
2308 ttyLocker ttyl; // keep the following output all in one block
2309 print(tty);
2310 }
2311
2312 void nmethod::print(outputStream* st) const {
2313 ResourceMark rm;
2314
2315 st->print("Compiled method ");
2316
2317 if (is_compiled_by_c1()) {
2318 st->print("(c1) ");
2319 } else if (is_compiled_by_c2()) {
2320 st->print("(c2) ");
2321 } else if (is_compiled_by_jvmci()) {
2322 st->print("(JVMCI) ");
2323 } else {
2324 st->print("(n/a) ");
2325 }
2326
2327 print_on(tty, NULL);
2328
2329 if (WizardMode) {
2330 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2331 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2332 st->print(" { ");
2333 st->print_cr("%s ", state());
2334 st->print_cr("}:");
2335 }
2336 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2337 p2i(this),
2338 p2i(this) + size(),
2339 size());
2340 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2341 p2i(relocation_begin()),
2342 p2i(relocation_end()),
2343 relocation_size());
2344 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2345 p2i(consts_begin()),
2346 p2i(consts_end()),
2347 consts_size());
2348 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2349 p2i(insts_begin()),
2350 p2i(insts_end()),
2351 insts_size());
2352 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2353 p2i(stub_begin()),
2354 p2i(stub_end()),
2355 stub_size());
2356 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2357 p2i(oops_begin()),
2358 p2i(oops_end()),
2359 oops_size());
2360 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2361 p2i(metadata_begin()),
2362 p2i(metadata_end()),
2363 metadata_size());
2364 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2365 p2i(scopes_data_begin()),
2366 p2i(scopes_data_end()),
2367 scopes_data_size());
2368 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2369 p2i(scopes_pcs_begin()),
2370 p2i(scopes_pcs_end()),
2371 scopes_pcs_size());
2372 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2373 p2i(dependencies_begin()),
2374 p2i(dependencies_end()),
2375 dependencies_size());
2376 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2377 p2i(handler_table_begin()),
2378 p2i(handler_table_end()),
2379 handler_table_size());
2380 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2381 p2i(nul_chk_table_begin()),
2382 p2i(nul_chk_table_end()),
2383 nul_chk_table_size());
2384 #if INCLUDE_JVMCI
2385 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2386 p2i(speculations_begin()),
2387 p2i(speculations_end()),
2388 speculations_size());
2389 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2390 p2i(jvmci_data_begin()),
2391 p2i(jvmci_data_end()),
2392 jvmci_data_size());
2393 #endif
2394 }
2395
2396 void nmethod::print_code() {
2397 HandleMark hm;
2398 ResourceMark m;
2399 ttyLocker ttyl;
2400 // Call the specialized decode method of this class.
2401 decode(tty);
2402 }
2403
2404 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2405
2406 void nmethod::print_dependencies() {
2407 ResourceMark rm;
2408 ttyLocker ttyl; // keep the following output all in one block
2409 tty->print_cr("Dependencies:");
2410 for (Dependencies::DepStream deps(this); deps.next(); ) {
2411 deps.print_dependency();
2412 Klass* ctxk = deps.context_type();
2413 if (ctxk != NULL) {
2414 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2415 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2416 }
2417 }
2418 deps.log_dependency(); // put it into the xml log also
2419 }
2420 }
2421 #endif
2422
2423 #if defined(SUPPORT_DATA_STRUCTS)
2424
2425 // Print the oops from the underlying CodeBlob.
2426 void nmethod::print_oops(outputStream* st) {
2427 HandleMark hm;
2428 ResourceMark m;
2429 st->print("Oops:");
2430 if (oops_begin() < oops_end()) {
2431 st->cr();
2432 for (oop* p = oops_begin(); p < oops_end(); p++) {
2433 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2434 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2435 if (*p == Universe::non_oop_word()) {
2436 st->print_cr("NON_OOP");
2437 continue; // skip non-oops
2438 }
2439 if (*p == NULL) {
2440 st->print_cr("NULL-oop");
2441 continue; // skip non-oops
2442 }
2443 (*p)->print_value_on(st);
2444 st->cr();
2445 }
2446 } else {
2447 st->print_cr(" <list empty>");
2448 }
2449 }
2450
2451 // Print metadata pool.
2452 void nmethod::print_metadata(outputStream* st) {
2453 HandleMark hm;
2454 ResourceMark m;
2455 st->print("Metadata:");
2456 if (metadata_begin() < metadata_end()) {
2457 st->cr();
2458 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2459 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2460 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2461 if (*p && *p != Universe::non_oop_word()) {
2462 (*p)->print_value_on(st);
2463 }
2464 st->cr();
2465 }
2466 } else {
2467 st->print_cr(" <list empty>");
2468 }
2469 }
2470
2471 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2472 void nmethod::print_scopes_on(outputStream* st) {
2473 // Find the first pc desc for all scopes in the code and print it.
2474 ResourceMark rm;
2475 st->print("scopes:");
2476 if (scopes_pcs_begin() < scopes_pcs_end()) {
2477 st->cr();
2478 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2479 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2480 continue;
2481
2482 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2483 while (sd != NULL) {
2484 sd->print_on(st, p); // print output ends with a newline
2485 sd = sd->sender();
2486 }
2487 }
2488 } else {
2489 st->print_cr(" <list empty>");
2490 }
2491 }
2492 #endif
2493
2494 #ifndef PRODUCT // RelocIterator does support printing only then.
2495 void nmethod::print_relocations() {
2496 ResourceMark m; // in case methods get printed via the debugger
2497 tty->print_cr("relocations:");
2498 RelocIterator iter(this);
2499 iter.print();
2500 }
2501 #endif
2502
2503 void nmethod::print_pcs_on(outputStream* st) {
2504 ResourceMark m; // in case methods get printed via debugger
2505 st->print("pc-bytecode offsets:");
2506 if (scopes_pcs_begin() < scopes_pcs_end()) {
2507 st->cr();
2508 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2509 p->print_on(st, this); // print output ends with a newline
2510 }
2511 } else {
2512 st->print_cr(" <list empty>");
2513 }
2514 }
2515
2516 void nmethod::print_handler_table() {
2517 ExceptionHandlerTable(this).print();
2518 }
2519
2520 void nmethod::print_nul_chk_table() {
2521 ImplicitExceptionTable(this).print(code_begin());
2522 }
2523
2524 void nmethod::print_recorded_oops() {
2525 const int n = oops_count();
2526 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2527 tty->print("Recorded oops:");
2528 if (n > 0) {
2529 tty->cr();
2530 for (int i = 0; i < n; i++) {
2531 oop o = oop_at(i);
2532 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2533 if (o == (oop)Universe::non_oop_word()) {
2534 tty->print("non-oop word");
2535 } else if (o == NULL) {
2536 tty->print("NULL-oop");
2537 } else {
2538 o->print_value_on(tty);
2539 }
2540 tty->cr();
2541 }
2542 } else {
2543 tty->print_cr(" <list empty>");
2544 }
2545 }
2546
2547 void nmethod::print_recorded_metadata() {
2548 const int n = metadata_count();
2549 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2550 tty->print("Recorded metadata:");
2551 if (n > 0) {
2552 tty->cr();
2553 for (int i = 0; i < n; i++) {
2554 Metadata* m = metadata_at(i);
2555 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2556 if (m == (Metadata*)Universe::non_oop_word()) {
2557 tty->print("non-metadata word");
2558 } else if (m == NULL) {
2559 tty->print("NULL-oop");
2560 } else {
2561 Metadata::print_value_on_maybe_null(tty, m);
2562 }
2563 tty->cr();
2564 }
2565 } else {
2566 tty->print_cr(" <list empty>");
2567 }
2568 }
2569 #endif
2570
2571 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2572
2573 void nmethod::print_constant_pool(outputStream* st) {
2574 //-----------------------------------
2575 //---< Print the constant pool >---
2576 //-----------------------------------
2577 int consts_size = this->consts_size();
2578 if ( consts_size > 0 ) {
2579 unsigned char* cstart = this->consts_begin();
2580 unsigned char* cp = cstart;
2581 unsigned char* cend = cp + consts_size;
2582 unsigned int bytes_per_line = 4;
2583 unsigned int CP_alignment = 8;
2584 unsigned int n;
2585
2586 st->cr();
2587
2588 //---< print CP header to make clear what's printed >---
2589 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2590 n = bytes_per_line;
2591 st->print_cr("[Constant Pool]");
2592 Disassembler::print_location(cp, cstart, cend, st, true, true);
2593 Disassembler::print_hexdata(cp, n, st, true);
2594 st->cr();
2595 } else {
2596 n = (uintptr_t)cp&(bytes_per_line-1);
2597 st->print_cr("[Constant Pool (unaligned)]");
2598 }
2599
2600 //---< print CP contents, bytes_per_line at a time >---
2601 while (cp < cend) {
2602 Disassembler::print_location(cp, cstart, cend, st, true, false);
2603 Disassembler::print_hexdata(cp, n, st, false);
2604 cp += n;
2605 n = bytes_per_line;
2606 st->cr();
2607 }
2608
2609 //---< Show potential alignment gap between constant pool and code >---
2610 cend = code_begin();
2611 if( cp < cend ) {
2612 n = 4;
2613 st->print_cr("[Code entry alignment]");
2614 while (cp < cend) {
2615 Disassembler::print_location(cp, cstart, cend, st, false, false);
2616 cp += n;
2617 st->cr();
2618 }
2619 }
2620 } else {
2621 st->print_cr("[Constant Pool (empty)]");
2622 }
2623 st->cr();
2624 }
2625
2626 #endif
2627
2628 // Disassemble this nmethod.
2629 // Print additional debug information, if requested. This could be code
2630 // comments, block comments, profiling counters, etc.
2631 // The undisassembled format is useful no disassembler library is available.
2632 // The resulting hex dump (with markers) can be disassembled later, or on
2633 // another system, when/where a disassembler library is available.
2634 void nmethod::decode2(outputStream* ost) const {
2635
2636 // Called from frame::back_trace_with_decode without ResourceMark.
2637 ResourceMark rm;
2638
2639 // Make sure we have a valid stream to print on.
2640 outputStream* st = ost ? ost : tty;
2641
2642 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2643 const bool use_compressed_format = true;
2644 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2645 AbstractDisassembler::show_block_comment());
2646 #else
2647 const bool use_compressed_format = Disassembler::is_abstract();
2648 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2649 AbstractDisassembler::show_block_comment());
2650 #endif
2651
2652 st->cr();
2653 this->print(st);
2654 st->cr();
2655
2656 #if defined(SUPPORT_ASSEMBLY)
2657 //----------------------------------
2658 //---< Print real disassembly >---
2659 //----------------------------------
2660 if (! use_compressed_format) {
2661 Disassembler::decode(const_cast<nmethod*>(this), st);
2662 return;
2663 }
2664 #endif
2665
2666 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2667
2668 // Compressed undisassembled disassembly format.
2669 // The following stati are defined/supported:
2670 // = 0 - currently at bol() position, nothing printed yet on current line.
2671 // = 1 - currently at position after print_location().
2672 // > 1 - in the midst of printing instruction stream bytes.
2673 int compressed_format_idx = 0;
2674 int code_comment_column = 0;
2675 const int instr_maxlen = Assembler::instr_maxlen();
2676 const uint tabspacing = 8;
2677 unsigned char* start = this->code_begin();
2678 unsigned char* p = this->code_begin();
2679 unsigned char* end = this->code_end();
2680 unsigned char* pss = p; // start of a code section (used for offsets)
2681
2682 if ((start == NULL) || (end == NULL)) {
2683 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2684 return;
2685 }
2686 #endif
2687
2688 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2689 //---< plain abstract disassembly, no comments or anything, just section headers >---
2690 if (use_compressed_format && ! compressed_with_comments) {
2691 const_cast<nmethod*>(this)->print_constant_pool(st);
2692
2693 //---< Open the output (Marker for post-mortem disassembler) >---
2694 st->print_cr("[MachCode]");
2695 const char* header = NULL;
2696 address p0 = p;
2697 while (p < end) {
2698 address pp = p;
2699 while ((p < end) && (header == NULL)) {
2700 header = nmethod_section_label(p);
2701 pp = p;
2702 p += Assembler::instr_len(p);
2703 }
2704 if (pp > p0) {
2705 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2706 p0 = pp;
2707 p = pp;
2708 header = NULL;
2709 } else if (header != NULL) {
2710 st->bol();
2711 st->print_cr("%s", header);
2712 header = NULL;
2713 }
2714 }
2715 //---< Close the output (Marker for post-mortem disassembler) >---
2716 st->bol();
2717 st->print_cr("[/MachCode]");
2718 return;
2719 }
2720 #endif
2721
2722 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2723 //---< abstract disassembly with comments and section headers merged in >---
2724 if (compressed_with_comments) {
2725 const_cast<nmethod*>(this)->print_constant_pool(st);
2726
2727 //---< Open the output (Marker for post-mortem disassembler) >---
2728 st->print_cr("[MachCode]");
2729 while ((p < end) && (p != NULL)) {
2730 const int instruction_size_in_bytes = Assembler::instr_len(p);
2731
2732 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2733 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2734 // Prints nmethod_section_label as well.
2735 if (AbstractDisassembler::show_block_comment()) {
2736 print_block_comment(st, p);
2737 if (st->position() == 0) {
2738 compressed_format_idx = 0;
2739 }
2740 }
2741
2742 //---< New location information after line break >---
2743 if (compressed_format_idx == 0) {
2744 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2745 compressed_format_idx = 1;
2746 }
2747
2748 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2749 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2750 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2751
2752 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2753 //---< interrupt instruction byte stream for code comment >---
2754 if (compressed_format_idx > 1) {
2755 st->cr(); // interrupt byte stream
2756 st->cr(); // add an empty line
2757 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2758 }
2759 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2760 st->bol();
2761 compressed_format_idx = 0;
2762 }
2763
2764 //---< New location information after line break >---
2765 if (compressed_format_idx == 0) {
2766 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2767 compressed_format_idx = 1;
2768 }
2769
2770 //---< Nicely align instructions for readability >---
2771 if (compressed_format_idx > 1) {
2772 Disassembler::print_delimiter(st);
2773 }
2774
2775 //---< Now, finally, print the actual instruction bytes >---
2776 unsigned char* p0 = p;
2777 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2778 compressed_format_idx += p - p0;
2779
2780 if (Disassembler::start_newline(compressed_format_idx-1)) {
2781 st->cr();
2782 compressed_format_idx = 0;
2783 }
2784 }
2785 //---< Close the output (Marker for post-mortem disassembler) >---
2786 st->bol();
2787 st->print_cr("[/MachCode]");
2788 return;
2789 }
2790 #endif
2791 }
2792
2793 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2794
2795 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2796 RelocIterator iter(this, begin, end);
2797 bool have_one = false;
2798 while (iter.next()) {
2799 have_one = true;
2800 switch (iter.type()) {
2801 case relocInfo::none: return "no_reloc";
2802 case relocInfo::oop_type: {
2803 // Get a non-resizable resource-allocated stringStream.
2804 // Our callees make use of (nested) ResourceMarks.
2805 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2806 oop_Relocation* r = iter.oop_reloc();
2807 oop obj = r->oop_value();
2808 st.print("oop(");
2809 if (obj == NULL) st.print("NULL");
2810 else obj->print_value_on(&st);
2811 st.print(")");
2812 return st.as_string();
2813 }
2814 case relocInfo::metadata_type: {
2815 stringStream st;
2816 metadata_Relocation* r = iter.metadata_reloc();
2817 Metadata* obj = r->metadata_value();
2818 st.print("metadata(");
2819 if (obj == NULL) st.print("NULL");
2820 else obj->print_value_on(&st);
2821 st.print(")");
2822 return st.as_string();
2823 }
2824 case relocInfo::runtime_call_type:
2825 case relocInfo::runtime_call_w_cp_type: {
2826 stringStream st;
2827 st.print("runtime_call");
2828 CallRelocation* r = (CallRelocation*)iter.reloc();
2829 address dest = r->destination();
2830 CodeBlob* cb = CodeCache::find_blob(dest);
2831 if (cb != NULL) {
2832 st.print(" %s", cb->name());
2833 } else {
2834 ResourceMark rm;
2835 const int buflen = 1024;
2836 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2837 int offset;
2838 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2839 st.print(" %s", buf);
2840 if (offset != 0) {
2841 st.print("+%d", offset);
2842 }
2843 }
2844 }
2845 return st.as_string();
2846 }
2847 case relocInfo::virtual_call_type: {
2848 stringStream st;
2849 st.print_raw("virtual_call");
2850 virtual_call_Relocation* r = iter.virtual_call_reloc();
2851 Method* m = r->method_value();
2852 if (m != NULL) {
2853 assert(m->is_method(), "");
2854 m->print_short_name(&st);
2855 }
2856 return st.as_string();
2857 }
2858 case relocInfo::opt_virtual_call_type: {
2859 stringStream st;
2860 st.print_raw("optimized virtual_call");
2861 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2862 Method* m = r->method_value();
2863 if (m != NULL) {
2864 assert(m->is_method(), "");
2865 m->print_short_name(&st);
2866 }
2867 return st.as_string();
2868 }
2869 case relocInfo::static_call_type: {
2870 stringStream st;
2871 st.print_raw("static_call");
2872 static_call_Relocation* r = iter.static_call_reloc();
2873 Method* m = r->method_value();
2874 if (m != NULL) {
2875 assert(m->is_method(), "");
2876 m->print_short_name(&st);
2877 }
2878 return st.as_string();
2879 }
2880 case relocInfo::static_stub_type: return "static_stub";
2881 case relocInfo::external_word_type: return "external_word";
2882 case relocInfo::internal_word_type: return "internal_word";
2883 case relocInfo::section_word_type: return "section_word";
2884 case relocInfo::poll_type: return "poll";
2885 case relocInfo::poll_return_type: return "poll_return";
2886 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2887 case relocInfo::type_mask: return "type_bit_mask";
2888
2889 default:
2890 break;
2891 }
2892 }
2893 return have_one ? "other" : NULL;
2894 }
2895
2896 // Return a the last scope in (begin..end]
2897 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2898 PcDesc* p = pc_desc_near(begin+1);
2899 if (p != NULL && p->real_pc(this) <= end) {
2900 return new ScopeDesc(this, p->scope_decode_offset(),
2901 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2902 p->return_oop(), p->return_vt());
2903 }
2904 return NULL;
2905 }
2906
2907 const char* nmethod::nmethod_section_label(address pos) const {
2908 const char* label = NULL;
2909 if (pos == code_begin()) label = "[Instructions begin]";
2910 if (pos == entry_point()) label = "[Entry Point]";
2911 if (pos == value_entry_point()) label = "[Value Entry Point]";
2912 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2913 if (pos == verified_value_entry_point()) label = "[Verified Value Entry Point]";
2914 if (pos == verified_value_ro_entry_point()) label = "[Verified Value Entry Point (RO)]";
2915 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2916 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2917 // Check stub_code before checking exception_handler or deopt_handler.
2918 if (pos == this->stub_begin()) label = "[Stub Code]";
2919 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2920 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2921 return label;
2922 }
2923
2924 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
2925 if (pos == entry) {
2926 stream->bol();
2927 stream->print_cr("%s", label);
2928 return 1;
2929 } else {
2930 return 0;
2931 }
2932 }
2933
2934 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2935 if (print_section_labels) {
2936 int n = 0;
2937 // Multiple entry points may be at the same position. Print them all.
2938 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
2939 n += maybe_print_entry_label(stream, block_begin, value_entry_point(), "[Value Entry Point]");
2940 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
2941 n += maybe_print_entry_label(stream, block_begin, verified_value_entry_point(), "[Verified Value Entry Point]");
2942 n += maybe_print_entry_label(stream, block_begin, verified_value_ro_entry_point(), "[Verified Value Entry Point (RO)]");
2943 if (n == 0) {
2944 const char* label = nmethod_section_label(block_begin);
2945 if (label != NULL) {
2946 stream->bol();
2947 stream->print_cr("%s", label);
2948 }
2949 }
2950 }
2951
2952 if (_nmethod_to_print != this) {
2953 return;
2954 }
2955 methodHandle m = method();
2956 if (m.is_null() || is_osr_method()) {
2957 return;
2958 }
2959
2960 // Print the name of the method (only once)
2961 address low = MIN4(entry_point(), verified_entry_point(), verified_value_entry_point(), verified_value_ro_entry_point());
2962 low = MIN2(low, value_entry_point());
2963 assert(low != 0, "sanity");
2964 if (block_begin == low) {
2965 stream->print(" # ");
2966 m->print_value_on(stream);
2967 stream->cr();
2968 }
2969
2970 // Print the arguments for the 3 types of verified entry points
2971 {
2972 const CompiledEntrySignature* ces = _nmethod_to_print_ces;
2973 const GrowableArray<SigEntry>* sig_cc;
2974 const VMRegPair* regs;
2975 if (block_begin == verified_entry_point()) {
2976 sig_cc = &ces->sig_cc();
2977 regs = ces->regs_cc();
2978 } else if (block_begin == verified_value_entry_point()) {
2979 sig_cc = &ces->sig();
2980 regs = ces->regs();
2981 } else if (block_begin == verified_value_ro_entry_point()) {
2982 sig_cc = &ces->sig_cc_ro();
2983 regs = ces->regs_cc_ro();
2984 } else {
2985 return;
2986 }
2987
2988 ResourceMark rm;
2989 int sizeargs = 0;
2990 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2991 bool has_scalarized_args = ces->has_scalarized_args();
2992 TempNewSymbol sig = SigEntry::create_symbol(sig_cc);
2993 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
2994 BasicType t = ss.type();
2995 sig_bt[sizeargs++] = t;
2996 if (type2size[t] == 2) {
2997 sig_bt[sizeargs++] = T_VOID;
2998 } else {
2999 assert(type2size[t] == 1, "size is 1 or 2");
3000 }
3001 }
3002 bool has_this = !m->is_static();
3003 if (ces->has_value_recv() && block_begin == verified_entry_point()) {
3004 // <this> argument is scalarized for verified_entry_point()
3005 has_this = false;
3006 }
3007 const char* spname = "sp"; // make arch-specific?
3008 int stack_slot_offset = this->frame_size() * wordSize;
3009 int tab1 = 14, tab2 = 24;
3010 int sig_index = 0;
3011 int sig_index_cc = 0;
3012 int arg_index = has_this ? -1 : 0;
3013 bool did_old_sp = false;
3014 for (SignatureStream ss(sig); !ss.at_return_type(); ) {
3015 bool at_this = (arg_index == -1);
3016 bool at_old_sp = false;
3017 BasicType t = ss.type();
3018 assert(t == sig_bt[sig_index], "sigs in sync");
3019 if (at_this) {
3020 stream->print(" # this: ");
3021 } else {
3022 stream->print(" # parm%d: ", arg_index);
3023 }
3024 stream->move_to(tab1);
3025 VMReg fst = regs[sig_index].first();
3026 VMReg snd = regs[sig_index].second();
3027 if (fst->is_reg()) {
3028 stream->print("%s", fst->name());
3029 if (snd->is_valid()) {
3030 stream->print(":%s", snd->name());
3031 }
3032 } else if (fst->is_stack()) {
3033 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3034 if (offset == stack_slot_offset) at_old_sp = true;
3035 stream->print("[%s+0x%x]", spname, offset);
3036 } else {
3037 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3038 }
3039 stream->print(" ");
3040 stream->move_to(tab2);
3041 stream->print("= ");
3042 if (at_this) {
3043 m->method_holder()->print_value_on(stream);
3044 } else {
3045 bool did_name = false;
3046 if (ss.is_object()) {
3047 Symbol* name = ss.as_symbol_or_null();
3048 if (name != NULL && name->utf8_length() > 0) {
3049 name->print_value_on(stream);
3050 did_name = true;
3051 }
3052 }
3053 if (!did_name)
3054 stream->print("%s", type2name(t));
3055 }
3056 if (has_scalarized_args) {
3057 while (!SigEntry::skip_value_delimiters(sig_cc, sig_index_cc)) {
3058 sig_index_cc++;
3059 }
3060 if (SigEntry::is_reserved_entry(sig_cc, sig_index_cc)) {
3061 stream->print(" [RESERVED]");
3062 }
3063 sig_index_cc += type2size[t];
3064 }
3065 if (at_old_sp) {
3066 stream->print(" (%s of caller)", spname);
3067 did_old_sp = true;
3068 }
3069 stream->cr();
3070 sig_index += type2size[t];
3071 arg_index += 1;
3072 ss.next();
3073 }
3074 if (!did_old_sp) {
3075 stream->print(" # ");
3076 stream->move_to(tab1);
3077 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3078 stream->print(" (%s of caller)", spname);
3079 stream->cr();
3080 }
3081 }
3082 }
3083
3084 // Returns whether this nmethod has code comments.
3085 bool nmethod::has_code_comment(address begin, address end) {
3086 // scopes?
3087 ScopeDesc* sd = scope_desc_in(begin, end);
3088 if (sd != NULL) return true;
3089
3090 // relocations?
3091 const char* str = reloc_string_for(begin, end);
3092 if (str != NULL) return true;
3093
3094 // implicit exceptions?
3095 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3096 if (cont_offset != 0) return true;
3097
3098 return false;
3099 }
3100
3101 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3102 ImplicitExceptionTable implicit_table(this);
3103 int pc_offset = begin - code_begin();
3104 int cont_offset = implicit_table.continuation_offset(pc_offset);
3105 bool oop_map_required = false;
3106 if (cont_offset != 0) {
3107 st->move_to(column, 6, 0);
3108 if (pc_offset == cont_offset) {
3109 st->print("; implicit exception: deoptimizes");
3110 oop_map_required = true;
3111 } else {
3112 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3113 }
3114 }
3115
3116 // Find an oopmap in (begin, end]. We use the odd half-closed
3117 // interval so that oop maps and scope descs which are tied to the
3118 // byte after a call are printed with the call itself. OopMaps
3119 // associated with implicit exceptions are printed with the implicit
3120 // instruction.
3121 address base = code_begin();
3122 ImmutableOopMapSet* oms = oop_maps();
3123 if (oms != NULL) {
3124 for (int i = 0, imax = oms->count(); i < imax; i++) {
3125 const ImmutableOopMapPair* pair = oms->pair_at(i);
3126 const ImmutableOopMap* om = pair->get_from(oms);
3127 address pc = base + pair->pc_offset();
3128 if (pc >= begin) {
3129 #if INCLUDE_JVMCI
3130 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3131 #else
3132 bool is_implicit_deopt = false;
3133 #endif
3134 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3135 st->move_to(column, 6, 0);
3136 st->print("; ");
3137 om->print_on(st);
3138 oop_map_required = false;
3139 }
3140 }
3141 if (pc > end) {
3142 break;
3143 }
3144 }
3145 }
3146 assert(!oop_map_required, "missed oopmap");
3147
3148 // Print any debug info present at this pc.
3149 ScopeDesc* sd = scope_desc_in(begin, end);
3150 if (sd != NULL) {
3151 st->move_to(column, 6, 0);
3152 if (sd->bci() == SynchronizationEntryBCI) {
3153 st->print(";*synchronization entry");
3154 } else if (sd->bci() == AfterBci) {
3155 st->print(";* method exit (unlocked if synchronized)");
3156 } else if (sd->bci() == UnwindBci) {
3157 st->print(";* unwind (locked if synchronized)");
3158 } else if (sd->bci() == AfterExceptionBci) {
3159 st->print(";* unwind (unlocked if synchronized)");
3160 } else if (sd->bci() == UnknownBci) {
3161 st->print(";* unknown");
3162 } else if (sd->bci() == InvalidFrameStateBci) {
3163 st->print(";* invalid frame state");
3164 } else {
3165 if (sd->method() == NULL) {
3166 st->print("method is NULL");
3167 } else if (sd->method()->is_native()) {
3168 st->print("method is native");
3169 } else {
3170 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3171 st->print(";*%s", Bytecodes::name(bc));
3172 switch (bc) {
3173 case Bytecodes::_invokevirtual:
3174 case Bytecodes::_invokespecial:
3175 case Bytecodes::_invokestatic:
3176 case Bytecodes::_invokeinterface:
3177 {
3178 Bytecode_invoke invoke(sd->method(), sd->bci());
3179 st->print(" ");
3180 if (invoke.name() != NULL)
3181 invoke.name()->print_symbol_on(st);
3182 else
3183 st->print("<UNKNOWN>");
3184 break;
3185 }
3186 case Bytecodes::_getfield:
3187 case Bytecodes::_putfield:
3188 case Bytecodes::_getstatic:
3189 case Bytecodes::_putstatic:
3190 {
3191 Bytecode_field field(sd->method(), sd->bci());
3192 st->print(" ");
3193 if (field.name() != NULL)
3194 field.name()->print_symbol_on(st);
3195 else
3196 st->print("<UNKNOWN>");
3197 }
3198 default:
3199 break;
3200 }
3201 }
3202 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_vt=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_vt());
3203 }
3204
3205 // Print all scopes
3206 for (;sd != NULL; sd = sd->sender()) {
3207 st->move_to(column, 6, 0);
3208 st->print("; -");
3209 if (sd->should_reexecute()) {
3210 st->print(" (reexecute)");
3211 }
3212 if (sd->method() == NULL) {
3213 st->print("method is NULL");
3214 } else {
3215 sd->method()->print_short_name(st);
3216 }
3217 int lineno = sd->method()->line_number_from_bci(sd->bci());
3218 if (lineno != -1) {
3219 st->print("@%d (line %d)", sd->bci(), lineno);
3220 } else {
3221 st->print("@%d", sd->bci());
3222 }
3223 st->cr();
3224 }
3225 }
3226
3227 // Print relocation information
3228 // Prevent memory leak: allocating without ResourceMark.
3229 ResourceMark rm;
3230 const char* str = reloc_string_for(begin, end);
3231 if (str != NULL) {
3232 if (sd != NULL) st->cr();
3233 st->move_to(column, 6, 0);
3234 st->print("; {%s}", str);
3235 }
3236 }
3237
3238 #endif
3239
3240 class DirectNativeCallWrapper: public NativeCallWrapper {
3241 private:
3242 NativeCall* _call;
3243
3244 public:
3245 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3246
3247 virtual address destination() const { return _call->destination(); }
3248 virtual address instruction_address() const { return _call->instruction_address(); }
3249 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3250 virtual address return_address() const { return _call->return_address(); }
3251
3252 virtual address get_resolve_call_stub(bool is_optimized) const {
3253 if (is_optimized) {
3254 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3255 }
3256 return SharedRuntime::get_resolve_virtual_call_stub();
3257 }
3258
3259 virtual void set_destination_mt_safe(address dest) {
3260 #if INCLUDE_AOT
3261 if (UseAOT) {
3262 CodeBlob* callee = CodeCache::find_blob(dest);
3263 CompiledMethod* cm = callee->as_compiled_method_or_null();
3264 if (cm != NULL && cm->is_far_code()) {
3265 // Temporary fix, see JDK-8143106
3266 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3267 csc->set_to_far(methodHandle(cm->method()), dest);
3268 return;
3269 }
3270 }
3271 #endif
3272 _call->set_destination_mt_safe(dest);
3273 }
3274
3275 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3276 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3277 #if INCLUDE_AOT
3278 if (info.to_aot()) {
3279 csc->set_to_far(method, info.entry());
3280 } else
3281 #endif
3282 {
3283 csc->set_to_interpreted(method, info.entry());
3284 }
3285 }
3286
3287 virtual void verify() const {
3288 // make sure code pattern is actually a call imm32 instruction
3289 _call->verify();
3290 _call->verify_alignment();
3291 }
3292
3293 virtual void verify_resolve_call(address dest) const {
3294 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3295 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3296 }
3297
3298 virtual bool is_call_to_interpreted(address dest) const {
3299 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3300 return cb->contains(dest);
3301 }
3302
3303 virtual bool is_safe_for_patching() const { return false; }
3304
3305 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3306 return nativeMovConstReg_at(r->cached_value());
3307 }
3308
3309 virtual void *get_data(NativeInstruction* instruction) const {
3310 return (void*)((NativeMovConstReg*) instruction)->data();
3311 }
3312
3313 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3314 ((NativeMovConstReg*) instruction)->set_data(data);
3315 }
3316 };
3317
3318 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3319 return new DirectNativeCallWrapper((NativeCall*) call);
3320 }
3321
3322 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3323 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3324 }
3325
3326 address nmethod::call_instruction_address(address pc) const {
3327 if (NativeCall::is_call_before(pc)) {
3328 NativeCall *ncall = nativeCall_before(pc);
3329 return ncall->instruction_address();
3330 }
3331 return NULL;
3332 }
3333
3334 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3335 return CompiledDirectStaticCall::at(call_site);
3336 }
3337
3338 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3339 return CompiledDirectStaticCall::at(call_site);
3340 }
3341
3342 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3343 return CompiledDirectStaticCall::before(return_addr);
3344 }
3345
3346 #if defined(SUPPORT_DATA_STRUCTS)
3347 void nmethod::print_value_on(outputStream* st) const {
3348 st->print("nmethod");
3349 print_on(st, NULL);
3350 }
3351 #endif
3352
3353 #ifndef PRODUCT
3354
3355 void nmethod::print_calls(outputStream* st) {
3356 RelocIterator iter(this);
3357 while (iter.next()) {
3358 switch (iter.type()) {
3359 case relocInfo::virtual_call_type:
3360 case relocInfo::opt_virtual_call_type: {
3361 CompiledICLocker ml_verify(this);
3362 CompiledIC_at(&iter)->print();
3363 break;
3364 }
3365 case relocInfo::static_call_type:
3366 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3367 CompiledDirectStaticCall::at(iter.reloc())->print();
3368 break;
3369 default:
3370 break;
3371 }
3372 }
3373 }
3374
3375 void nmethod::print_statistics() {
3376 ttyLocker ttyl;
3377 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3378 native_nmethod_stats.print_native_nmethod_stats();
3379 #ifdef COMPILER1
3380 c1_java_nmethod_stats.print_nmethod_stats("C1");
3381 #endif
3382 #ifdef COMPILER2
3383 c2_java_nmethod_stats.print_nmethod_stats("C2");
3384 #endif
3385 #if INCLUDE_JVMCI
3386 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3387 #endif
3388 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3389 DebugInformationRecorder::print_statistics();
3390 #ifndef PRODUCT
3391 pc_nmethod_stats.print_pc_stats();
3392 #endif
3393 Dependencies::print_statistics();
3394 if (xtty != NULL) xtty->tail("statistics");
3395 }
3396
3397 #endif // !PRODUCT
3398
3399 #if INCLUDE_JVMCI
3400 void nmethod::update_speculation(JavaThread* thread) {
3401 jlong speculation = thread->pending_failed_speculation();
3402 if (speculation != 0) {
3403 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3404 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3405 thread->set_pending_failed_speculation(0);
3406 }
3407 }
3408
3409 const char* nmethod::jvmci_name() {
3410 if (jvmci_nmethod_data() != NULL) {
3411 return jvmci_nmethod_data()->name();
3412 }
3413 return NULL;
3414 }
3415 #endif