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/flags/flagSetting.hpp"
54 #include "runtime/frame.inline.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/jniHandles.inline.hpp"
57 #include "runtime/orderAccess.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/sweeper.hpp"
62 #include "runtime/vmThread.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/resourceHash.hpp"
67 #include "utilities/xmlstream.hpp"
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciRuntime.hpp"
70 #endif
71
72 #ifdef DTRACE_ENABLED
73
74 // Only bother with this argument setup if dtrace is available
75
76 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
77 { \
78 Method* m = (method); \
79 if (m != NULL) { \
80 Symbol* klass_name = m->klass_name(); \
81 Symbol* name = m->name(); \
82 Symbol* signature = m->signature(); \
83 HOTSPOT_COMPILED_METHOD_UNLOAD( \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length()); \
87 } \
88 }
89
90 #else // ndef DTRACE_ENABLED
91
92 #define DTRACE_METHOD_UNLOAD_PROBE(method)
93
94 #endif
95
96 //---------------------------------------------------------------------------------
97 // NMethod statistics
98 // They are printed under various flags, including:
99 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
100 // (In the latter two cases, they like other stats are printed to the log only.)
101
102 #ifndef PRODUCT
103 // These variables are put into one block to reduce relocations
104 // and make it simpler to print from the debugger.
105 struct java_nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117 #if INCLUDE_JVMCI
118 int speculations_size;
119 int jvmci_data_size;
120 #endif
121 int oops_size;
122 int metadata_size;
123
124 void note_nmethod(nmethod* nm) {
125 nmethod_count += 1;
126 total_size += nm->size();
127 relocation_size += nm->relocation_size();
128 consts_size += nm->consts_size();
129 insts_size += nm->insts_size();
130 stub_size += nm->stub_size();
131 oops_size += nm->oops_size();
132 metadata_size += nm->metadata_size();
133 scopes_data_size += nm->scopes_data_size();
134 scopes_pcs_size += nm->scopes_pcs_size();
135 dependencies_size += nm->dependencies_size();
136 handler_table_size += nm->handler_table_size();
137 nul_chk_table_size += nm->nul_chk_table_size();
138 #if INCLUDE_JVMCI
139 speculations_size += nm->speculations_size();
140 jvmci_data_size += nm->jvmci_data_size();
141 #endif
142 }
143 void print_nmethod_stats(const char* name) {
144 if (nmethod_count == 0) return;
145 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
146 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
147 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
148 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
149 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
150 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
151 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
152 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
153 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
154 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
155 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
156 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
157 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
158 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
159 #if INCLUDE_JVMCI
160 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
161 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
162 #endif
163 }
164 };
165
166 struct native_nmethod_stats_struct {
167 int native_nmethod_count;
168 int native_total_size;
169 int native_relocation_size;
170 int native_insts_size;
171 int native_oops_size;
172 int native_metadata_size;
173 void note_native_nmethod(nmethod* nm) {
174 native_nmethod_count += 1;
175 native_total_size += nm->size();
176 native_relocation_size += nm->relocation_size();
177 native_insts_size += nm->insts_size();
178 native_oops_size += nm->oops_size();
179 native_metadata_size += nm->metadata_size();
180 }
181 void print_native_nmethod_stats() {
182 if (native_nmethod_count == 0) return;
183 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
184 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
185 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
186 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
187 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
188 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
189 }
190 };
191
192 struct pc_nmethod_stats_struct {
193 int pc_desc_resets; // number of resets (= number of caches)
194 int pc_desc_queries; // queries to nmethod::find_pc_desc
195 int pc_desc_approx; // number of those which have approximate true
196 int pc_desc_repeats; // number of _pc_descs[0] hits
197 int pc_desc_hits; // number of LRU cache hits
198 int pc_desc_tests; // total number of PcDesc examinations
199 int pc_desc_searches; // total number of quasi-binary search steps
200 int pc_desc_adds; // number of LUR cache insertions
201
202 void print_pc_stats() {
203 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
204 pc_desc_queries,
205 (double)(pc_desc_tests + pc_desc_searches)
206 / pc_desc_queries);
207 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
208 pc_desc_resets,
209 pc_desc_queries, pc_desc_approx,
210 pc_desc_repeats, pc_desc_hits,
211 pc_desc_tests, pc_desc_searches, pc_desc_adds);
212 }
213 };
214
215 #ifdef COMPILER1
216 static java_nmethod_stats_struct c1_java_nmethod_stats;
217 #endif
218 #ifdef COMPILER2
219 static java_nmethod_stats_struct c2_java_nmethod_stats;
220 #endif
221 #if INCLUDE_JVMCI
222 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
223 #endif
224 static java_nmethod_stats_struct unknown_java_nmethod_stats;
225
226 static native_nmethod_stats_struct native_nmethod_stats;
227 static pc_nmethod_stats_struct pc_nmethod_stats;
228
229 static void note_java_nmethod(nmethod* nm) {
230 #ifdef COMPILER1
231 if (nm->is_compiled_by_c1()) {
232 c1_java_nmethod_stats.note_nmethod(nm);
233 } else
234 #endif
235 #ifdef COMPILER2
236 if (nm->is_compiled_by_c2()) {
237 c2_java_nmethod_stats.note_nmethod(nm);
238 } else
239 #endif
240 #if INCLUDE_JVMCI
241 if (nm->is_compiled_by_jvmci()) {
242 jvmci_java_nmethod_stats.note_nmethod(nm);
243 } else
244 #endif
245 {
246 unknown_java_nmethod_stats.note_nmethod(nm);
247 }
248 }
249 #endif // !PRODUCT
250
251 //---------------------------------------------------------------------------------
252
253
254 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
255 assert(pc != NULL, "Must be non null");
256 assert(exception.not_null(), "Must be non null");
257 assert(handler != NULL, "Must be non null");
258
259 _count = 0;
260 _exception_type = exception->klass();
261 _next = NULL;
262 _purge_list_next = NULL;
263
264 add_address_and_handler(pc,handler);
265 }
266
267
268 address ExceptionCache::match(Handle exception, address pc) {
269 assert(pc != NULL,"Must be non null");
270 assert(exception.not_null(),"Must be non null");
271 if (exception->klass() == exception_type()) {
272 return (test_address(pc));
273 }
274
275 return NULL;
276 }
277
278
279 bool ExceptionCache::match_exception_with_space(Handle exception) {
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type() && count() < cache_size) {
282 return true;
283 }
284 return false;
285 }
286
287
288 address ExceptionCache::test_address(address addr) {
289 int limit = count();
290 for (int i = 0; i < limit; i++) {
291 if (pc_at(i) == addr) {
292 return handler_at(i);
293 }
294 }
295 return NULL;
296 }
297
298
299 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
300 if (test_address(addr) == handler) return true;
301
302 int index = count();
303 if (index < cache_size) {
304 set_pc_at(index, addr);
305 set_handler_at(index, handler);
306 increment_count();
307 return true;
308 }
309 return false;
310 }
311
312 ExceptionCache* ExceptionCache::next() {
313 return Atomic::load(&_next);
314 }
315
316 void ExceptionCache::set_next(ExceptionCache *ec) {
317 Atomic::store(ec, &_next);
318 }
319
320 //-----------------------------------------------------------------------------
321
322
323 // Helper used by both find_pc_desc methods.
324 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
325 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
326 if (!approximate)
327 return pc->pc_offset() == pc_offset;
328 else
329 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
330 }
331
332 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
333 if (initial_pc_desc == NULL) {
334 _pc_descs[0] = NULL; // native method; no PcDescs at all
335 return;
336 }
337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
338 // reset the cache by filling it with benign (non-null) values
339 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
340 for (int i = 0; i < cache_size; i++)
341 _pc_descs[i] = initial_pc_desc;
342 }
343
344 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
345 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
346 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
347
348 // Note: one might think that caching the most recently
349 // read value separately would be a win, but one would be
350 // wrong. When many threads are updating it, the cache
351 // line it's in would bounce between caches, negating
352 // any benefit.
353
354 // In order to prevent race conditions do not load cache elements
355 // repeatedly, but use a local copy:
356 PcDesc* res;
357
358 // Step one: Check the most recently added value.
359 res = _pc_descs[0];
360 if (res == NULL) return NULL; // native method; no PcDescs at all
361 if (match_desc(res, pc_offset, approximate)) {
362 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
363 return res;
364 }
365
366 // Step two: Check the rest of the LRU cache.
367 for (int i = 1; i < cache_size; ++i) {
368 res = _pc_descs[i];
369 if (res->pc_offset() < 0) break; // optimization: skip empty cache
370 if (match_desc(res, pc_offset, approximate)) {
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
372 return res;
373 }
374 }
375
376 // Report failure.
377 return NULL;
378 }
379
380 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
382 // Update the LRU cache by shifting pc_desc forward.
383 for (int i = 0; i < cache_size; i++) {
384 PcDesc* next = _pc_descs[i];
385 _pc_descs[i] = pc_desc;
386 pc_desc = next;
387 }
388 }
389
390 // adjust pcs_size so that it is a multiple of both oopSize and
391 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
392 // of oopSize, then 2*sizeof(PcDesc) is)
393 static int adjust_pcs_size(int pcs_size) {
394 int nsize = align_up(pcs_size, oopSize);
395 if ((nsize % sizeof(PcDesc)) != 0) {
396 nsize = pcs_size + sizeof(PcDesc);
397 }
398 assert((nsize % oopSize) == 0, "correct alignment");
399 return nsize;
400 }
401
402
403 int nmethod::total_size() const {
404 return
405 consts_size() +
406 insts_size() +
407 stub_size() +
408 scopes_data_size() +
409 scopes_pcs_size() +
410 handler_table_size() +
411 nul_chk_table_size();
412 }
413
414 address* nmethod::orig_pc_addr(const frame* fr) {
415 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
416 }
417
418 const char* nmethod::compile_kind() const {
419 if (is_osr_method()) return "osr";
420 if (method() != NULL && is_native_method()) return "c2n";
421 return NULL;
422 }
423
424 // Fill in default values for various flag fields
425 void nmethod::init_defaults() {
426 _state = not_installed;
427 _has_flushed_dependencies = 0;
428 _lock_count = 0;
429 _stack_traversal_mark = 0;
430 _unload_reported = false; // jvmti state
431 _is_far_code = false; // nmethods are located in CodeCache
432
433 #ifdef ASSERT
434 _oops_are_stale = false;
435 #endif
436
437 _oops_do_mark_link = NULL;
438 _jmethod_id = NULL;
439 _osr_link = NULL;
440 #if INCLUDE_RTM_OPT
441 _rtm_state = NoRTM;
442 #endif
443 }
444
445 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
446 int compile_id,
447 CodeBuffer *code_buffer,
448 int vep_offset,
449 int frame_complete,
450 int frame_size,
451 ByteSize basic_lock_owner_sp_offset,
452 ByteSize basic_lock_sp_offset,
453 OopMapSet* oop_maps) {
454 code_buffer->finalize_oop_references(method);
455 // create nmethod
456 nmethod* nm = NULL;
457 {
458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
459 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
460
461 CodeOffsets offsets;
462 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
463 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
464 nm = new (native_nmethod_size, CompLevel_none)
465 nmethod(method(), compiler_none, native_nmethod_size,
466 compile_id, &offsets,
467 code_buffer, frame_size,
468 basic_lock_owner_sp_offset,
469 basic_lock_sp_offset,
470 oop_maps);
471 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
472 }
473
474 if (nm != NULL) {
475 // verify nmethod
476 debug_only(nm->verify();) // might block
477
478 nm->log_new_nmethod();
479 nm->make_in_use();
480 }
481 return nm;
482 }
483
484 nmethod* nmethod::new_nmethod(const methodHandle& method,
485 int compile_id,
486 int entry_bci,
487 CodeOffsets* offsets,
488 int orig_pc_offset,
489 DebugInformationRecorder* debug_info,
490 Dependencies* dependencies,
491 CodeBuffer* code_buffer, int frame_size,
492 OopMapSet* oop_maps,
493 ExceptionHandlerTable* handler_table,
494 ImplicitExceptionTable* nul_chk_table,
495 AbstractCompiler* compiler,
496 int comp_level
497 #if INCLUDE_JVMCI
498 , char* speculations,
499 int speculations_len,
500 int nmethod_mirror_index,
501 const char* nmethod_mirror_name,
502 FailedSpeculation** failed_speculations
503 #endif
504 )
505 {
506 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
507 code_buffer->finalize_oop_references(method);
508 // create nmethod
509 nmethod* nm = NULL;
510 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
511 #if INCLUDE_JVMCI
512 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
513 #endif
514 int nmethod_size =
515 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
516 + adjust_pcs_size(debug_info->pcs_size())
517 + align_up((int)dependencies->size_in_bytes(), oopSize)
518 + align_up(handler_table->size_in_bytes() , oopSize)
519 + align_up(nul_chk_table->size_in_bytes() , oopSize)
520 #if INCLUDE_JVMCI
521 + align_up(speculations_len , oopSize)
522 + align_up(jvmci_data_size , oopSize)
523 #endif
524 + align_up(debug_info->data_size() , oopSize);
525
526 nm = new (nmethod_size, comp_level)
527 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
528 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
529 oop_maps,
530 handler_table,
531 nul_chk_table,
532 compiler,
533 comp_level
534 #if INCLUDE_JVMCI
535 , speculations,
536 speculations_len,
537 jvmci_data_size
538 #endif
539 );
540
541 if (nm != NULL) {
542 #if INCLUDE_JVMCI
543 if (compiler->is_jvmci()) {
544 // Initialize the JVMCINMethodData object inlined into nm
545 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
546 }
547 #endif
548 // To make dependency checking during class loading fast, record
549 // the nmethod dependencies in the classes it is dependent on.
550 // This allows the dependency checking code to simply walk the
551 // class hierarchy above the loaded class, checking only nmethods
552 // which are dependent on those classes. The slow way is to
553 // check every nmethod for dependencies which makes it linear in
554 // the number of methods compiled. For applications with a lot
555 // classes the slow way is too slow.
556 for (Dependencies::DepStream deps(nm); deps.next(); ) {
557 if (deps.type() == Dependencies::call_site_target_value) {
558 // CallSite dependencies are managed on per-CallSite instance basis.
559 oop call_site = deps.argument_oop(0);
560 MethodHandles::add_dependent_nmethod(call_site, nm);
561 } else {
562 Klass* klass = deps.context_type();
563 if (klass == NULL) {
564 continue; // ignore things like evol_method
565 }
566 // record this nmethod as dependent on this klass
567 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
568 }
569 }
570 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
571 }
572 }
573 // Do verification and logging outside CodeCache_lock.
574 if (nm != NULL) {
575 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
576 DEBUG_ONLY(nm->verify();)
577 nm->log_new_nmethod();
578 }
579 return nm;
580 }
581
582 // For native wrappers
583 nmethod::nmethod(
584 Method* method,
585 CompilerType type,
586 int nmethod_size,
587 int compile_id,
588 CodeOffsets* offsets,
589 CodeBuffer* code_buffer,
590 int frame_size,
591 ByteSize basic_lock_owner_sp_offset,
592 ByteSize basic_lock_sp_offset,
593 OopMapSet* oop_maps )
594 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
595 _is_unloading_state(0),
596 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
597 _native_basic_lock_sp_offset(basic_lock_sp_offset)
598 {
599 {
600 int scopes_data_offset = 0;
601 int deoptimize_offset = 0;
602 int deoptimize_mh_offset = 0;
603
604 debug_only(NoSafepointVerifier nsv;)
605 assert_locked_or_safepoint(CodeCache_lock);
606
607 init_defaults();
608 _entry_bci = InvocationEntryBci;
609 // We have no exception handler or deopt handler make the
610 // values something that will never match a pc like the nmethod vtable entry
611 _exception_offset = 0;
612 _orig_pc_offset = 0;
613
614 _consts_offset = data_offset();
615 _stub_offset = data_offset();
616 _oops_offset = data_offset();
617 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
618 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
619 _scopes_pcs_offset = scopes_data_offset;
620 _dependencies_offset = _scopes_pcs_offset;
621 _handler_table_offset = _dependencies_offset;
622 _nul_chk_table_offset = _handler_table_offset;
623 #if INCLUDE_JVMCI
624 _speculations_offset = _nul_chk_table_offset;
625 _jvmci_data_offset = _speculations_offset;
626 _nmethod_end_offset = _jvmci_data_offset;
627 #else
628 _nmethod_end_offset = _nul_chk_table_offset;
629 #endif
630 _compile_id = compile_id;
631 _comp_level = CompLevel_none;
632 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
633 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
634 _osr_entry_point = NULL;
635 _exception_cache = NULL;
636 _pc_desc_container.reset_to(NULL);
637 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
638
639 _scopes_data_begin = (address) this + scopes_data_offset;
640 _deopt_handler_begin = (address) this + deoptimize_offset;
641 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
642
643 code_buffer->copy_code_and_locs_to(this);
644 code_buffer->copy_values_to(this);
645
646 clear_unloading_state();
647
648 Universe::heap()->register_nmethod(this);
649 debug_only(Universe::heap()->verify_nmethod(this));
650
651 CodeCache::commit(this);
652 }
653
654 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
655 ttyLocker ttyl; // keep the following output all in one block
656 // This output goes directly to the tty, not the compiler log.
657 // To enable tools to match it up with the compilation activity,
658 // be sure to tag this tty output with the compile ID.
659 if (xtty != NULL) {
660 xtty->begin_head("print_native_nmethod");
661 xtty->method(_method);
662 xtty->stamp();
663 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
664 }
665 // Print the header part, then print the requested information.
666 // This is both handled in decode2(), called via print_code() -> decode()
667 if (PrintNativeNMethods) {
668 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
669 print_code();
670 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
671 #if defined(SUPPORT_DATA_STRUCTS)
672 if (AbstractDisassembler::show_structs()) {
673 if (oop_maps != NULL) {
674 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
675 oop_maps->print_on(tty);
676 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
677 }
678 }
679 #endif
680 } else {
681 print(); // print the header part only.
682 }
683 #if defined(SUPPORT_DATA_STRUCTS)
684 if (AbstractDisassembler::show_structs()) {
685 if (PrintRelocations) {
686 print_relocations();
687 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
688 }
689 }
690 #endif
691 if (xtty != NULL) {
692 xtty->tail("print_native_nmethod");
693 }
694 }
695 }
696
697 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
698 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
699 }
700
701 nmethod::nmethod(
702 Method* method,
703 CompilerType type,
704 int nmethod_size,
705 int compile_id,
706 int entry_bci,
707 CodeOffsets* offsets,
708 int orig_pc_offset,
709 DebugInformationRecorder* debug_info,
710 Dependencies* dependencies,
711 CodeBuffer *code_buffer,
712 int frame_size,
713 OopMapSet* oop_maps,
714 ExceptionHandlerTable* handler_table,
715 ImplicitExceptionTable* nul_chk_table,
716 AbstractCompiler* compiler,
717 int comp_level
718 #if INCLUDE_JVMCI
719 , char* speculations,
720 int speculations_len,
721 int jvmci_data_size
722 #endif
723 )
724 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
725 _is_unloading_state(0),
726 _native_receiver_sp_offset(in_ByteSize(-1)),
727 _native_basic_lock_sp_offset(in_ByteSize(-1))
728 {
729 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
730 {
731 debug_only(NoSafepointVerifier nsv;)
732 assert_locked_or_safepoint(CodeCache_lock);
733
734 _deopt_handler_begin = (address) this;
735 _deopt_mh_handler_begin = (address) this;
736
737 init_defaults();
738 _entry_bci = entry_bci;
739 _compile_id = compile_id;
740 _comp_level = comp_level;
741 _orig_pc_offset = orig_pc_offset;
742 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
743
744 // Section offsets
745 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
746 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
747 set_ctable_begin(header_begin() + _consts_offset);
748
749 #if INCLUDE_JVMCI
750 if (compiler->is_jvmci()) {
751 // JVMCI might not produce any stub sections
752 if (offsets->value(CodeOffsets::Exceptions) != -1) {
753 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
754 } else {
755 _exception_offset = -1;
756 }
757 if (offsets->value(CodeOffsets::Deopt) != -1) {
758 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
759 } else {
760 _deopt_handler_begin = NULL;
761 }
762 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
763 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
764 } else {
765 _deopt_mh_handler_begin = NULL;
766 }
767 } else
768 #endif
769 {
770 // Exception handler and deopt handler are in the stub section
771 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
772 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
773
774 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
775 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
776 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
777 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
778 } else {
779 _deopt_mh_handler_begin = NULL;
780 }
781 }
782 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
783 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
784 } else {
785 _unwind_handler_offset = -1;
786 }
787
788 _oops_offset = data_offset();
789 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
790 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
791
792 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
793 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
794 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
795 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
796 #if INCLUDE_JVMCI
797 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
798 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
799 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
800 #else
801 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
802 #endif
803 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
804 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
805 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
806 _exception_cache = NULL;
807 _scopes_data_begin = (address) this + scopes_data_offset;
808
809 _pc_desc_container.reset_to(scopes_pcs_begin());
810
811 code_buffer->copy_code_and_locs_to(this);
812 // Copy contents of ScopeDescRecorder to nmethod
813 code_buffer->copy_values_to(this);
814 debug_info->copy_to(this);
815 dependencies->copy_to(this);
816 clear_unloading_state();
817
818 Universe::heap()->register_nmethod(this);
819 debug_only(Universe::heap()->verify_nmethod(this));
820
821 CodeCache::commit(this);
822
823 // Copy contents of ExceptionHandlerTable to nmethod
824 handler_table->copy_to(this);
825 nul_chk_table->copy_to(this);
826
827 #if INCLUDE_JVMCI
828 // Copy speculations to nmethod
829 if (speculations_size() != 0) {
830 memcpy(speculations_begin(), speculations, speculations_len);
831 }
832 #endif
833
834 // we use the information of entry points to find out if a method is
835 // static or non static
836 assert(compiler->is_c2() || compiler->is_jvmci() ||
837 _method->is_static() == (entry_point() == _verified_entry_point),
838 " entry points must be same for static methods and vice versa");
839 }
840 }
841
842 // Print a short set of xml attributes to identify this nmethod. The
843 // output should be embedded in some other element.
844 void nmethod::log_identity(xmlStream* log) const {
845 log->print(" compile_id='%d'", compile_id());
846 const char* nm_kind = compile_kind();
847 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
848 log->print(" compiler='%s'", compiler_name());
849 if (TieredCompilation) {
850 log->print(" level='%d'", comp_level());
851 }
852 #if INCLUDE_JVMCI
853 if (jvmci_nmethod_data() != NULL) {
854 const char* jvmci_name = jvmci_nmethod_data()->name();
855 if (jvmci_name != NULL) {
856 log->print(" jvmci_mirror_name='");
857 log->text("%s", jvmci_name);
858 log->print("'");
859 }
860 }
861 #endif
862 }
863
864
865 #define LOG_OFFSET(log, name) \
866 if (p2i(name##_end()) - p2i(name##_begin())) \
867 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
868 p2i(name##_begin()) - p2i(this))
869
870
871 void nmethod::log_new_nmethod() const {
872 if (LogCompilation && xtty != NULL) {
873 ttyLocker ttyl;
874 HandleMark hm;
875 xtty->begin_elem("nmethod");
876 log_identity(xtty);
877 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
878 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
879
880 LOG_OFFSET(xtty, relocation);
881 LOG_OFFSET(xtty, consts);
882 LOG_OFFSET(xtty, insts);
883 LOG_OFFSET(xtty, stub);
884 LOG_OFFSET(xtty, scopes_data);
885 LOG_OFFSET(xtty, scopes_pcs);
886 LOG_OFFSET(xtty, dependencies);
887 LOG_OFFSET(xtty, handler_table);
888 LOG_OFFSET(xtty, nul_chk_table);
889 LOG_OFFSET(xtty, oops);
890 LOG_OFFSET(xtty, metadata);
891
892 xtty->method(method());
893 xtty->stamp();
894 xtty->end_elem();
895 }
896 }
897
898 #undef LOG_OFFSET
899
900
901 // Print out more verbose output usually for a newly created nmethod.
902 void nmethod::print_on(outputStream* st, const char* msg) const {
903 if (st != NULL) {
904 ttyLocker ttyl;
905 if (WizardMode) {
906 CompileTask::print(st, this, msg, /*short_form:*/ true);
907 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
908 } else {
909 CompileTask::print(st, this, msg, /*short_form:*/ false);
910 }
911 }
912 }
913
914 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
915 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
916 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
917 print_nmethod(printnmethods);
918 }
919 }
920
921 void nmethod::print_nmethod(bool printmethod) {
922 ttyLocker ttyl; // keep the following output all in one block
923 if (xtty != NULL) {
924 xtty->begin_head("print_nmethod");
925 xtty->stamp();
926 xtty->end_head();
927 }
928 // Print the header part, then print the requested information.
929 // This is both handled in decode2().
930 if (printmethod) {
931 HandleMark hm;
932 ResourceMark m;
933 if (is_compiled_by_c1()) {
934 tty->cr();
935 tty->print_cr("============================= C1-compiled nmethod ==============================");
936 }
937 if (is_compiled_by_jvmci()) {
938 tty->cr();
939 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
940 }
941 tty->print_cr("----------------------------------- Assembly -----------------------------------");
942 decode2(tty);
943 #if defined(SUPPORT_DATA_STRUCTS)
944 if (AbstractDisassembler::show_structs()) {
945 // Print the oops from the underlying CodeBlob as well.
946 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
947 print_oops(tty);
948 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
949 print_metadata(tty);
950 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
951 print_pcs();
952 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
953 if (oop_maps() != NULL) {
954 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
955 oop_maps()->print_on(tty);
956 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
957 }
958 }
959 #endif
960 } else {
961 print(); // print the header part only.
962 }
963
964 #if defined(SUPPORT_DATA_STRUCTS)
965 if (AbstractDisassembler::show_structs()) {
966 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
967 print_scopes();
968 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
969 }
970 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
971 print_relocations();
972 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
973 }
974 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
975 print_dependencies();
976 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
977 }
978 if (printmethod || PrintExceptionHandlers) {
979 print_handler_table();
980 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
981 print_nul_chk_table();
982 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
983 }
984
985 if (printmethod) {
986 print_recorded_oops();
987 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
988 print_recorded_metadata();
989 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
990 }
991 }
992 #endif
993
994 if (xtty != NULL) {
995 xtty->tail("print_nmethod");
996 }
997 }
998
999
1000 // Promote one word from an assembly-time handle to a live embedded oop.
1001 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1002 if (handle == NULL ||
1003 // As a special case, IC oops are initialized to 1 or -1.
1004 handle == (jobject) Universe::non_oop_word()) {
1005 (*dest) = (oop) handle;
1006 } else {
1007 (*dest) = JNIHandles::resolve_non_null(handle);
1008 }
1009 }
1010
1011
1012 // Have to have the same name because it's called by a template
1013 void nmethod::copy_values(GrowableArray<jobject>* array) {
1014 int length = array->length();
1015 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1016 oop* dest = oops_begin();
1017 for (int index = 0 ; index < length; index++) {
1018 initialize_immediate_oop(&dest[index], array->at(index));
1019 }
1020
1021 // Now we can fix up all the oops in the code. We need to do this
1022 // in the code because the assembler uses jobjects as placeholders.
1023 // The code and relocations have already been initialized by the
1024 // CodeBlob constructor, so it is valid even at this early point to
1025 // iterate over relocations and patch the code.
1026 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1027 }
1028
1029 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1030 int length = array->length();
1031 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1032 Metadata** dest = metadata_begin();
1033 for (int index = 0 ; index < length; index++) {
1034 dest[index] = array->at(index);
1035 }
1036 }
1037
1038 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1039 // re-patch all oop-bearing instructions, just in case some oops moved
1040 RelocIterator iter(this, begin, end);
1041 while (iter.next()) {
1042 if (iter.type() == relocInfo::oop_type) {
1043 oop_Relocation* reloc = iter.oop_reloc();
1044 if (initialize_immediates && reloc->oop_is_immediate()) {
1045 oop* dest = reloc->oop_addr();
1046 initialize_immediate_oop(dest, (jobject) *dest);
1047 }
1048 // Refresh the oop-related bits of this instruction.
1049 reloc->fix_oop_relocation();
1050 } else if (iter.type() == relocInfo::metadata_type) {
1051 metadata_Relocation* reloc = iter.metadata_reloc();
1052 reloc->fix_metadata_relocation();
1053 }
1054 }
1055 }
1056
1057
1058 void nmethod::verify_clean_inline_caches() {
1059 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1060
1061 ResourceMark rm;
1062 RelocIterator iter(this, oops_reloc_begin());
1063 while(iter.next()) {
1064 switch(iter.type()) {
1065 case relocInfo::virtual_call_type:
1066 case relocInfo::opt_virtual_call_type: {
1067 CompiledIC *ic = CompiledIC_at(&iter);
1068 // Ok, to lookup references to zombies here
1069 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1070 assert(cb != NULL, "destination not in CodeBlob?");
1071 nmethod* nm = cb->as_nmethod_or_null();
1072 if( nm != NULL ) {
1073 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1074 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1075 assert(ic->is_clean(), "IC should be clean");
1076 }
1077 }
1078 break;
1079 }
1080 case relocInfo::static_call_type: {
1081 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1082 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1083 assert(cb != NULL, "destination not in CodeBlob?");
1084 nmethod* nm = cb->as_nmethod_or_null();
1085 if( nm != NULL ) {
1086 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1087 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1088 assert(csc->is_clean(), "IC should be clean");
1089 }
1090 }
1091 break;
1092 }
1093 default:
1094 break;
1095 }
1096 }
1097 }
1098
1099 // This is a private interface with the sweeper.
1100 void nmethod::mark_as_seen_on_stack() {
1101 assert(is_alive(), "Must be an alive method");
1102 // Set the traversal mark to ensure that the sweeper does 2
1103 // cleaning passes before moving to zombie.
1104 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1105 }
1106
1107 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1108 // there are no activations on the stack, not in use by the VM,
1109 // and not in use by the ServiceThread)
1110 bool nmethod::can_convert_to_zombie() {
1111 // Note that this is called when the sweeper has observed the nmethod to be
1112 // not_entrant. However, with concurrent code cache unloading, the state
1113 // might have moved on to unloaded if it is_unloading(), due to racing
1114 // concurrent GC threads.
1115 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1116
1117 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1118 // count can be greater than the stack traversal count before it hits the
1119 // nmethod for the second time.
1120 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1121 // convert it to zombie due to GC unloading interactions. However, if it
1122 // has become unloaded, then it is okay to convert such nmethods to zombie.
1123 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1124 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1125 }
1126
1127 void nmethod::inc_decompile_count() {
1128 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1129 // Could be gated by ProfileTraps, but do not bother...
1130 Method* m = method();
1131 if (m == NULL) return;
1132 MethodData* mdo = m->method_data();
1133 if (mdo == NULL) return;
1134 // There is a benign race here. See comments in methodData.hpp.
1135 mdo->inc_decompile_count();
1136 }
1137
1138 void nmethod::make_unloaded() {
1139 post_compiled_method_unload();
1140
1141 // This nmethod is being unloaded, make sure that dependencies
1142 // recorded in instanceKlasses get flushed.
1143 // Since this work is being done during a GC, defer deleting dependencies from the
1144 // InstanceKlass.
1145 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1146 "should only be called during gc");
1147 flush_dependencies(/*delete_immediately*/false);
1148
1149 // Break cycle between nmethod & method
1150 LogTarget(Trace, class, unload, nmethod) lt;
1151 if (lt.is_enabled()) {
1152 LogStream ls(lt);
1153 ls.print("making nmethod " INTPTR_FORMAT
1154 " unloadable, Method*(" INTPTR_FORMAT
1155 ") ",
1156 p2i(this), p2i(_method));
1157 ls.cr();
1158 }
1159 // Unlink the osr method, so we do not look this up again
1160 if (is_osr_method()) {
1161 // Invalidate the osr nmethod only once
1162 if (is_in_use()) {
1163 invalidate_osr_method();
1164 }
1165 #ifdef ASSERT
1166 if (method() != NULL) {
1167 // Make sure osr nmethod is invalidated, i.e. not on the list
1168 bool found = method()->method_holder()->remove_osr_nmethod(this);
1169 assert(!found, "osr nmethod should have been invalidated");
1170 }
1171 #endif
1172 }
1173
1174 // If _method is already NULL the Method* is about to be unloaded,
1175 // so we don't have to break the cycle. Note that it is possible to
1176 // have the Method* live here, in case we unload the nmethod because
1177 // it is pointing to some oop (other than the Method*) being unloaded.
1178 if (_method != NULL) {
1179 // OSR methods point to the Method*, but the Method* does not
1180 // point back!
1181 if (_method->code() == this) {
1182 _method->clear_code(); // Break a cycle
1183 }
1184 }
1185
1186 // Make the class unloaded - i.e., change state and notify sweeper
1187 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1188 "must be at safepoint");
1189
1190 {
1191 // Clear ICStubs and release any CompiledICHolders.
1192 CompiledICLocker ml(this);
1193 clear_ic_callsites();
1194 }
1195
1196 // Unregister must be done before the state change
1197 {
1198 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1199 Mutex::_no_safepoint_check_flag);
1200 Universe::heap()->unregister_nmethod(this);
1201 CodeCache::unregister_old_nmethod(this);
1202 }
1203
1204 // Clear the method of this dead nmethod
1205 set_method(NULL);
1206
1207 // Log the unloading.
1208 log_state_change();
1209
1210 // The Method* is gone at this point
1211 assert(_method == NULL, "Tautology");
1212
1213 set_osr_link(NULL);
1214 NMethodSweeper::report_state_change(this);
1215
1216 // The release is only needed for compile-time ordering, as accesses
1217 // into the nmethod after the store are not safe due to the sweeper
1218 // being allowed to free it when the store is observed, during
1219 // concurrent nmethod unloading. Therefore, there is no need for
1220 // acquire on the loader side.
1221 OrderAccess::release_store(&_state, (signed char)unloaded);
1222
1223 #if INCLUDE_JVMCI
1224 // Clear the link between this nmethod and a HotSpotNmethod mirror
1225 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1226 if (nmethod_data != NULL) {
1227 nmethod_data->invalidate_nmethod_mirror(this);
1228 nmethod_data->clear_nmethod_mirror(this);
1229 }
1230 #endif
1231 }
1232
1233 void nmethod::invalidate_osr_method() {
1234 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1235 // Remove from list of active nmethods
1236 if (method() != NULL) {
1237 method()->method_holder()->remove_osr_nmethod(this);
1238 }
1239 }
1240
1241 void nmethod::log_state_change() const {
1242 if (LogCompilation) {
1243 if (xtty != NULL) {
1244 ttyLocker ttyl; // keep the following output all in one block
1245 if (_state == unloaded) {
1246 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1247 os::current_thread_id());
1248 } else {
1249 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1250 os::current_thread_id(),
1251 (_state == zombie ? " zombie='1'" : ""));
1252 }
1253 log_identity(xtty);
1254 xtty->stamp();
1255 xtty->end_elem();
1256 }
1257 }
1258
1259 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1260 CompileTask::print_ul(this, state_msg);
1261 if (PrintCompilation && _state != unloaded) {
1262 print_on(tty, state_msg);
1263 }
1264 }
1265
1266 void nmethod::unlink_from_method(bool acquire_lock) {
1267 // We need to check if both the _code and _from_compiled_code_entry_point
1268 // refer to this nmethod because there is a race in setting these two fields
1269 // in Method* as seen in bugid 4947125.
1270 // If the vep() points to the zombie nmethod, the memory for the nmethod
1271 // could be flushed and the compiler and vtable stubs could still call
1272 // through it.
1273 if (method() != NULL && (method()->code() == this ||
1274 method()->from_compiled_entry() == verified_entry_point())) {
1275 method()->clear_code(acquire_lock);
1276 }
1277 }
1278
1279 /**
1280 * Common functionality for both make_not_entrant and make_zombie
1281 */
1282 bool nmethod::make_not_entrant_or_zombie(int state) {
1283 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1284 assert(!is_zombie(), "should not already be a zombie");
1285
1286 if (_state == state) {
1287 // Avoid taking the lock if already in required state.
1288 // This is safe from races because the state is an end-state,
1289 // which the nmethod cannot back out of once entered.
1290 // No need for fencing either.
1291 return false;
1292 }
1293
1294 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1295 nmethodLocker nml(this);
1296 methodHandle the_method(method());
1297 // This can be called while the system is already at a safepoint which is ok
1298 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1299
1300 // during patching, depending on the nmethod state we must notify the GC that
1301 // code has been unloaded, unregistering it. We cannot do this right while
1302 // holding the Patching_lock because we need to use the CodeCache_lock. This
1303 // would be prone to deadlocks.
1304 // This flag is used to remember whether we need to later lock and unregister.
1305 bool nmethod_needs_unregister = false;
1306
1307 {
1308 // invalidate osr nmethod before acquiring the patching lock since
1309 // they both acquire leaf locks and we don't want a deadlock.
1310 // This logic is equivalent to the logic below for patching the
1311 // verified entry point of regular methods. We check that the
1312 // nmethod is in use to ensure that it is invalidated only once.
1313 if (is_osr_method() && is_in_use()) {
1314 // this effectively makes the osr nmethod not entrant
1315 invalidate_osr_method();
1316 }
1317
1318 // Enter critical section. Does not block for safepoint.
1319 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1320
1321 if (_state == state) {
1322 // another thread already performed this transition so nothing
1323 // to do, but return false to indicate this.
1324 return false;
1325 }
1326
1327 // The caller can be calling the method statically or through an inline
1328 // cache call.
1329 if (!is_osr_method() && !is_not_entrant()) {
1330 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1331 SharedRuntime::get_handle_wrong_method_stub());
1332 }
1333
1334 if (is_in_use() && update_recompile_counts()) {
1335 // It's a true state change, so mark the method as decompiled.
1336 // Do it only for transition from alive.
1337 inc_decompile_count();
1338 }
1339
1340 // If the state is becoming a zombie, signal to unregister the nmethod with
1341 // the heap.
1342 // This nmethod may have already been unloaded during a full GC.
1343 if ((state == zombie) && !is_unloaded()) {
1344 nmethod_needs_unregister = true;
1345 }
1346
1347 // Must happen before state change. Otherwise we have a race condition in
1348 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1349 // transition its state from 'not_entrant' to 'zombie' without having to wait
1350 // for stack scanning.
1351 if (state == not_entrant) {
1352 mark_as_seen_on_stack();
1353 OrderAccess::storestore(); // _stack_traversal_mark and _state
1354 }
1355
1356 // Change state
1357 _state = state;
1358
1359 // Log the transition once
1360 log_state_change();
1361
1362 // Remove nmethod from method.
1363 unlink_from_method(false /* already owns Patching_lock */);
1364 } // leave critical region under Patching_lock
1365
1366 #if INCLUDE_JVMCI
1367 // Invalidate can't occur while holding the Patching lock
1368 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1369 if (nmethod_data != NULL) {
1370 nmethod_data->invalidate_nmethod_mirror(this);
1371 }
1372 #endif
1373
1374 #ifdef ASSERT
1375 if (is_osr_method() && method() != NULL) {
1376 // Make sure osr nmethod is invalidated, i.e. not on the list
1377 bool found = method()->method_holder()->remove_osr_nmethod(this);
1378 assert(!found, "osr nmethod should have been invalidated");
1379 }
1380 #endif
1381
1382 // When the nmethod becomes zombie it is no longer alive so the
1383 // dependencies must be flushed. nmethods in the not_entrant
1384 // state will be flushed later when the transition to zombie
1385 // happens or they get unloaded.
1386 if (state == zombie) {
1387 {
1388 // Flushing dependencies must be done before any possible
1389 // safepoint can sneak in, otherwise the oops used by the
1390 // dependency logic could have become stale.
1391 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1392 if (nmethod_needs_unregister) {
1393 Universe::heap()->unregister_nmethod(this);
1394 CodeCache::unregister_old_nmethod(this);
1395 }
1396 flush_dependencies(/*delete_immediately*/true);
1397 }
1398
1399 #if INCLUDE_JVMCI
1400 // Now that the nmethod has been unregistered, it's
1401 // safe to clear the HotSpotNmethod mirror oop.
1402 if (nmethod_data != NULL) {
1403 nmethod_data->clear_nmethod_mirror(this);
1404 }
1405 #endif
1406
1407 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1408 // nmethods during the next safepoint (see ICStub::finalize), as well
1409 // as to free up CompiledICHolder resources.
1410 {
1411 CompiledICLocker ml(this);
1412 clear_ic_callsites();
1413 }
1414
1415 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1416 // event and it hasn't already been reported for this nmethod then
1417 // report it now. The event may have been reported earlier if the GC
1418 // marked it for unloading). JvmtiDeferredEventQueue support means
1419 // we no longer go to a safepoint here.
1420 post_compiled_method_unload();
1421
1422 #ifdef ASSERT
1423 // It's no longer safe to access the oops section since zombie
1424 // nmethods aren't scanned for GC.
1425 _oops_are_stale = true;
1426 #endif
1427 // the Method may be reclaimed by class unloading now that the
1428 // nmethod is in zombie state
1429 set_method(NULL);
1430 } else {
1431 assert(state == not_entrant, "other cases may need to be handled differently");
1432 }
1433
1434 if (TraceCreateZombies && state == zombie) {
1435 ResourceMark m;
1436 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");
1437 }
1438
1439 NMethodSweeper::report_state_change(this);
1440 return true;
1441 }
1442
1443 void nmethod::flush() {
1444 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1445 // Note that there are no valid oops in the nmethod anymore.
1446 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1447 "osr nmethod must be unloaded or zombie before flushing");
1448 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1449 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1450 assert_locked_or_safepoint(CodeCache_lock);
1451
1452 // completely deallocate this method
1453 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1454 if (PrintMethodFlushing) {
1455 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1456 "/Free CodeCache:" SIZE_FORMAT "Kb",
1457 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1458 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1459 }
1460
1461 // We need to deallocate any ExceptionCache data.
1462 // Note that we do not need to grab the nmethod lock for this, it
1463 // better be thread safe if we're disposing of it!
1464 ExceptionCache* ec = exception_cache();
1465 set_exception_cache(NULL);
1466 while(ec != NULL) {
1467 ExceptionCache* next = ec->next();
1468 delete ec;
1469 ec = next;
1470 }
1471
1472 Universe::heap()->flush_nmethod(this);
1473
1474 CodeBlob::flush();
1475 CodeCache::free(this);
1476 }
1477
1478 oop nmethod::oop_at(int index) const {
1479 if (index == 0) {
1480 return NULL;
1481 }
1482 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1483 }
1484
1485 //
1486 // Notify all classes this nmethod is dependent on that it is no
1487 // longer dependent. This should only be called in two situations.
1488 // First, when a nmethod transitions to a zombie all dependents need
1489 // to be clear. Since zombification happens at a safepoint there's no
1490 // synchronization issues. The second place is a little more tricky.
1491 // During phase 1 of mark sweep class unloading may happen and as a
1492 // result some nmethods may get unloaded. In this case the flushing
1493 // of dependencies must happen during phase 1 since after GC any
1494 // dependencies in the unloaded nmethod won't be updated, so
1495 // traversing the dependency information in unsafe. In that case this
1496 // function is called with a boolean argument and this function only
1497 // notifies instanceKlasses that are reachable
1498
1499 void nmethod::flush_dependencies(bool delete_immediately) {
1500 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1501 assert(called_by_gc != delete_immediately,
1502 "delete_immediately is false if and only if we are called during GC");
1503 if (!has_flushed_dependencies()) {
1504 set_has_flushed_dependencies();
1505 for (Dependencies::DepStream deps(this); deps.next(); ) {
1506 if (deps.type() == Dependencies::call_site_target_value) {
1507 // CallSite dependencies are managed on per-CallSite instance basis.
1508 oop call_site = deps.argument_oop(0);
1509 if (delete_immediately) {
1510 assert_locked_or_safepoint(CodeCache_lock);
1511 MethodHandles::remove_dependent_nmethod(call_site, this);
1512 } else {
1513 MethodHandles::clean_dependency_context(call_site);
1514 }
1515 } else {
1516 Klass* klass = deps.context_type();
1517 if (klass == NULL) {
1518 continue; // ignore things like evol_method
1519 }
1520 // During GC delete_immediately is false, and liveness
1521 // of dependee determines class that needs to be updated.
1522 if (delete_immediately) {
1523 assert_locked_or_safepoint(CodeCache_lock);
1524 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1525 } else if (klass->is_loader_alive()) {
1526 // The GC may clean dependency contexts concurrently and in parallel.
1527 InstanceKlass::cast(klass)->clean_dependency_context();
1528 }
1529 }
1530 }
1531 }
1532 }
1533
1534 // ------------------------------------------------------------------
1535 // post_compiled_method_load_event
1536 // new method for install_code() path
1537 // Transfer information from compilation to jvmti
1538 void nmethod::post_compiled_method_load_event() {
1539
1540 Method* moop = method();
1541 HOTSPOT_COMPILED_METHOD_LOAD(
1542 (char *) moop->klass_name()->bytes(),
1543 moop->klass_name()->utf8_length(),
1544 (char *) moop->name()->bytes(),
1545 moop->name()->utf8_length(),
1546 (char *) moop->signature()->bytes(),
1547 moop->signature()->utf8_length(),
1548 insts_begin(), insts_size());
1549
1550 if (JvmtiExport::should_post_compiled_method_load() ||
1551 JvmtiExport::should_post_compiled_method_unload()) {
1552 get_and_cache_jmethod_id();
1553 }
1554
1555 if (JvmtiExport::should_post_compiled_method_load()) {
1556 // Let the Service thread (which is a real Java thread) post the event
1557 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1558 JvmtiDeferredEventQueue::enqueue(
1559 JvmtiDeferredEvent::compiled_method_load_event(this));
1560 }
1561 }
1562
1563 jmethodID nmethod::get_and_cache_jmethod_id() {
1564 if (_jmethod_id == NULL) {
1565 // Cache the jmethod_id since it can no longer be looked up once the
1566 // method itself has been marked for unloading.
1567 _jmethod_id = method()->jmethod_id();
1568 }
1569 return _jmethod_id;
1570 }
1571
1572 void nmethod::post_compiled_method_unload() {
1573 if (unload_reported()) {
1574 // During unloading we transition to unloaded and then to zombie
1575 // and the unloading is reported during the first transition.
1576 return;
1577 }
1578
1579 assert(_method != NULL && !is_unloaded(), "just checking");
1580 DTRACE_METHOD_UNLOAD_PROBE(method());
1581
1582 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1583 // post the event. Sometime later this nmethod will be made a zombie
1584 // by the sweeper but the Method* will not be valid at that point.
1585 // If the _jmethod_id is null then no load event was ever requested
1586 // so don't bother posting the unload. The main reason for this is
1587 // that the jmethodID is a weak reference to the Method* so if
1588 // it's being unloaded there's no way to look it up since the weak
1589 // ref will have been cleared.
1590 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1591 assert(!unload_reported(), "already unloaded");
1592 JvmtiDeferredEvent event =
1593 JvmtiDeferredEvent::compiled_method_unload_event(this,
1594 _jmethod_id, insts_begin());
1595 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1596 JvmtiDeferredEventQueue::enqueue(event);
1597 }
1598
1599 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1600 // any time. As the nmethod is being unloaded now we mark it has
1601 // having the unload event reported - this will ensure that we don't
1602 // attempt to report the event in the unlikely scenario where the
1603 // event is enabled at the time the nmethod is made a zombie.
1604 set_unload_reported();
1605 }
1606
1607 // Iterate over metadata calling this function. Used by RedefineClasses
1608 void nmethod::metadata_do(MetadataClosure* f) {
1609 {
1610 // Visit all immediate references that are embedded in the instruction stream.
1611 RelocIterator iter(this, oops_reloc_begin());
1612 while (iter.next()) {
1613 if (iter.type() == relocInfo::metadata_type) {
1614 metadata_Relocation* r = iter.metadata_reloc();
1615 // In this metadata, we must only follow those metadatas directly embedded in
1616 // the code. Other metadatas (oop_index>0) are seen as part of
1617 // the metadata section below.
1618 assert(1 == (r->metadata_is_immediate()) +
1619 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1620 "metadata must be found in exactly one place");
1621 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1622 Metadata* md = r->metadata_value();
1623 if (md != _method) f->do_metadata(md);
1624 }
1625 } else if (iter.type() == relocInfo::virtual_call_type) {
1626 // Check compiledIC holders associated with this nmethod
1627 ResourceMark rm;
1628 CompiledIC *ic = CompiledIC_at(&iter);
1629 if (ic->is_icholder_call()) {
1630 CompiledICHolder* cichk = ic->cached_icholder();
1631 f->do_metadata(cichk->holder_metadata());
1632 f->do_metadata(cichk->holder_klass());
1633 } else {
1634 Metadata* ic_oop = ic->cached_metadata();
1635 if (ic_oop != NULL) {
1636 f->do_metadata(ic_oop);
1637 }
1638 }
1639 }
1640 }
1641 }
1642
1643 // Visit the metadata section
1644 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1645 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1646 Metadata* md = *p;
1647 f->do_metadata(md);
1648 }
1649
1650 // Visit metadata not embedded in the other places.
1651 if (_method != NULL) f->do_metadata(_method);
1652 }
1653
1654 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1655 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1656 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1657 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1658 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1659
1660 class IsUnloadingState: public AllStatic {
1661 static const uint8_t _is_unloading_mask = 1;
1662 static const uint8_t _is_unloading_shift = 0;
1663 static const uint8_t _unloading_cycle_mask = 6;
1664 static const uint8_t _unloading_cycle_shift = 1;
1665
1666 static uint8_t set_is_unloading(uint8_t state, bool value) {
1667 state &= ~_is_unloading_mask;
1668 if (value) {
1669 state |= 1 << _is_unloading_shift;
1670 }
1671 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1672 return state;
1673 }
1674
1675 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1676 state &= ~_unloading_cycle_mask;
1677 state |= value << _unloading_cycle_shift;
1678 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1679 return state;
1680 }
1681
1682 public:
1683 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1684 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1685
1686 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1687 uint8_t state = 0;
1688 state = set_is_unloading(state, is_unloading);
1689 state = set_unloading_cycle(state, unloading_cycle);
1690 return state;
1691 }
1692 };
1693
1694 bool nmethod::is_unloading() {
1695 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1696 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1697 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1698 if (state_is_unloading) {
1699 return true;
1700 }
1701 uint8_t current_cycle = CodeCache::unloading_cycle();
1702 if (state_unloading_cycle == current_cycle) {
1703 return false;
1704 }
1705
1706 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1707 // oops in the CompiledMethod, by calling oops_do on it.
1708 state_unloading_cycle = current_cycle;
1709
1710 if (is_zombie()) {
1711 // Zombies without calculated unloading epoch are never unloading due to GC.
1712
1713 // There are no races where a previously observed is_unloading() nmethod
1714 // suddenly becomes not is_unloading() due to here being observed as zombie.
1715
1716 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1717 // and unloaded in the safepoint. That makes races where an nmethod is first
1718 // observed as is_alive() && is_unloading() and subsequently observed as
1719 // is_zombie() impossible.
1720
1721 // With concurrent unloading, all references to is_unloading() nmethods are
1722 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1723 // handshake operation is performed with all JavaThreads before finally
1724 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1725 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1726 // the global handshake, it is impossible for is_unloading() nmethods to
1727 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1728 // nmethods before taking that global handshake, meaning that it will never
1729 // be recalculated after the handshake.
1730
1731 // After that global handshake, is_unloading() nmethods are only observable
1732 // to the iterators, and they will never trigger recomputation of the cached
1733 // is_unloading_state, and hence may not suffer from such races.
1734
1735 state_is_unloading = false;
1736 } else {
1737 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1738 }
1739
1740 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1741
1742 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1743
1744 return state_is_unloading;
1745 }
1746
1747 void nmethod::clear_unloading_state() {
1748 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1749 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1750 }
1751
1752
1753 // This is called at the end of the strong tracing/marking phase of a
1754 // GC to unload an nmethod if it contains otherwise unreachable
1755 // oops.
1756
1757 void nmethod::do_unloading(bool unloading_occurred) {
1758 // Make sure the oop's ready to receive visitors
1759 assert(!is_zombie() && !is_unloaded(),
1760 "should not call follow on zombie or unloaded nmethod");
1761
1762 if (is_unloading()) {
1763 make_unloaded();
1764 } else {
1765 guarantee(unload_nmethod_caches(unloading_occurred),
1766 "Should not need transition stubs");
1767 }
1768 }
1769
1770 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1771 // make sure the oops ready to receive visitors
1772 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1773 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1774
1775 // Prevent extra code cache walk for platforms that don't have immediate oops.
1776 if (relocInfo::mustIterateImmediateOopsInCode()) {
1777 RelocIterator iter(this, oops_reloc_begin());
1778
1779 while (iter.next()) {
1780 if (iter.type() == relocInfo::oop_type ) {
1781 oop_Relocation* r = iter.oop_reloc();
1782 // In this loop, we must only follow those oops directly embedded in
1783 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1784 assert(1 == (r->oop_is_immediate()) +
1785 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1786 "oop must be found in exactly one place");
1787 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1788 f->do_oop(r->oop_addr());
1789 }
1790 }
1791 }
1792 }
1793
1794 // Scopes
1795 // This includes oop constants not inlined in the code stream.
1796 for (oop* p = oops_begin(); p < oops_end(); p++) {
1797 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1798 f->do_oop(p);
1799 }
1800 }
1801
1802 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1803
1804 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1805
1806 // An nmethod is "marked" if its _mark_link is set non-null.
1807 // Even if it is the end of the linked list, it will have a non-null link value,
1808 // as long as it is on the list.
1809 // This code must be MP safe, because it is used from parallel GC passes.
1810 bool nmethod::test_set_oops_do_mark() {
1811 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1812 if (_oops_do_mark_link == NULL) {
1813 // Claim this nmethod for this thread to mark.
1814 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1815 // Atomically append this nmethod (now claimed) to the head of the list:
1816 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1817 for (;;) {
1818 nmethod* required_mark_nmethods = observed_mark_nmethods;
1819 _oops_do_mark_link = required_mark_nmethods;
1820 observed_mark_nmethods =
1821 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1822 if (observed_mark_nmethods == required_mark_nmethods)
1823 break;
1824 }
1825 // Mark was clear when we first saw this guy.
1826 LogTarget(Trace, gc, nmethod) lt;
1827 if (lt.is_enabled()) {
1828 LogStream ls(lt);
1829 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1830 }
1831 return false;
1832 }
1833 }
1834 // On fall through, another racing thread marked this nmethod before we did.
1835 return true;
1836 }
1837
1838 void nmethod::oops_do_marking_prologue() {
1839 log_trace(gc, nmethod)("oops_do_marking_prologue");
1840 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1841 // We use cmpxchg instead of regular assignment here because the user
1842 // may fork a bunch of threads, and we need them all to see the same state.
1843 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1844 guarantee(observed == NULL, "no races in this sequential code");
1845 }
1846
1847 void nmethod::oops_do_marking_epilogue() {
1848 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1849 nmethod* cur = _oops_do_mark_nmethods;
1850 while (cur != NMETHOD_SENTINEL) {
1851 assert(cur != NULL, "not NULL-terminated");
1852 nmethod* next = cur->_oops_do_mark_link;
1853 cur->_oops_do_mark_link = NULL;
1854 DEBUG_ONLY(cur->verify_oop_relocations());
1855
1856 LogTarget(Trace, gc, nmethod) lt;
1857 if (lt.is_enabled()) {
1858 LogStream ls(lt);
1859 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1860 }
1861 cur = next;
1862 }
1863 nmethod* required = _oops_do_mark_nmethods;
1864 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1865 guarantee(observed == required, "no races in this sequential code");
1866 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1867 }
1868
1869 inline bool includes(void* p, void* from, void* to) {
1870 return from <= p && p < to;
1871 }
1872
1873
1874 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1875 assert(count >= 2, "must be sentinel values, at least");
1876
1877 #ifdef ASSERT
1878 // must be sorted and unique; we do a binary search in find_pc_desc()
1879 int prev_offset = pcs[0].pc_offset();
1880 assert(prev_offset == PcDesc::lower_offset_limit,
1881 "must start with a sentinel");
1882 for (int i = 1; i < count; i++) {
1883 int this_offset = pcs[i].pc_offset();
1884 assert(this_offset > prev_offset, "offsets must be sorted");
1885 prev_offset = this_offset;
1886 }
1887 assert(prev_offset == PcDesc::upper_offset_limit,
1888 "must end with a sentinel");
1889 #endif //ASSERT
1890
1891 // Search for MethodHandle invokes and tag the nmethod.
1892 for (int i = 0; i < count; i++) {
1893 if (pcs[i].is_method_handle_invoke()) {
1894 set_has_method_handle_invokes(true);
1895 break;
1896 }
1897 }
1898 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1899
1900 int size = count * sizeof(PcDesc);
1901 assert(scopes_pcs_size() >= size, "oob");
1902 memcpy(scopes_pcs_begin(), pcs, size);
1903
1904 // Adjust the final sentinel downward.
1905 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1906 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1907 last_pc->set_pc_offset(content_size() + 1);
1908 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1909 // Fill any rounding gaps with copies of the last record.
1910 last_pc[1] = last_pc[0];
1911 }
1912 // The following assert could fail if sizeof(PcDesc) is not
1913 // an integral multiple of oopSize (the rounding term).
1914 // If it fails, change the logic to always allocate a multiple
1915 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1916 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1917 }
1918
1919 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1920 assert(scopes_data_size() >= size, "oob");
1921 memcpy(scopes_data_begin(), buffer, size);
1922 }
1923
1924 #ifdef ASSERT
1925 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1926 PcDesc* lower = search.scopes_pcs_begin();
1927 PcDesc* upper = search.scopes_pcs_end();
1928 lower += 1; // exclude initial sentinel
1929 PcDesc* res = NULL;
1930 for (PcDesc* p = lower; p < upper; p++) {
1931 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1932 if (match_desc(p, pc_offset, approximate)) {
1933 if (res == NULL)
1934 res = p;
1935 else
1936 res = (PcDesc*) badAddress;
1937 }
1938 }
1939 return res;
1940 }
1941 #endif
1942
1943
1944 // Finds a PcDesc with real-pc equal to "pc"
1945 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1946 address base_address = search.code_begin();
1947 if ((pc < base_address) ||
1948 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1949 return NULL; // PC is wildly out of range
1950 }
1951 int pc_offset = (int) (pc - base_address);
1952
1953 // Check the PcDesc cache if it contains the desired PcDesc
1954 // (This as an almost 100% hit rate.)
1955 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1956 if (res != NULL) {
1957 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1958 return res;
1959 }
1960
1961 // Fallback algorithm: quasi-linear search for the PcDesc
1962 // Find the last pc_offset less than the given offset.
1963 // The successor must be the required match, if there is a match at all.
1964 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1965 PcDesc* lower = search.scopes_pcs_begin();
1966 PcDesc* upper = search.scopes_pcs_end();
1967 upper -= 1; // exclude final sentinel
1968 if (lower >= upper) return NULL; // native method; no PcDescs at all
1969
1970 #define assert_LU_OK \
1971 /* invariant on lower..upper during the following search: */ \
1972 assert(lower->pc_offset() < pc_offset, "sanity"); \
1973 assert(upper->pc_offset() >= pc_offset, "sanity")
1974 assert_LU_OK;
1975
1976 // Use the last successful return as a split point.
1977 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1978 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1979 if (mid->pc_offset() < pc_offset) {
1980 lower = mid;
1981 } else {
1982 upper = mid;
1983 }
1984
1985 // Take giant steps at first (4096, then 256, then 16, then 1)
1986 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1987 const int RADIX = (1 << LOG2_RADIX);
1988 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1989 while ((mid = lower + step) < upper) {
1990 assert_LU_OK;
1991 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1992 if (mid->pc_offset() < pc_offset) {
1993 lower = mid;
1994 } else {
1995 upper = mid;
1996 break;
1997 }
1998 }
1999 assert_LU_OK;
2000 }
2001
2002 // Sneak up on the value with a linear search of length ~16.
2003 while (true) {
2004 assert_LU_OK;
2005 mid = lower + 1;
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 #undef assert_LU_OK
2015
2016 if (match_desc(upper, pc_offset, approximate)) {
2017 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2018 _pc_desc_cache.add_pc_desc(upper);
2019 return upper;
2020 } else {
2021 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2022 return NULL;
2023 }
2024 }
2025
2026
2027 void nmethod::check_all_dependencies(DepChange& changes) {
2028 // Checked dependencies are allocated into this ResourceMark
2029 ResourceMark rm;
2030
2031 // Turn off dependency tracing while actually testing dependencies.
2032 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2033
2034 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2035 &DependencySignature::equals, 11027> DepTable;
2036
2037 DepTable* table = new DepTable();
2038
2039 // Iterate over live nmethods and check dependencies of all nmethods that are not
2040 // marked for deoptimization. A particular dependency is only checked once.
2041 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2042 while(iter.next()) {
2043 nmethod* nm = iter.method();
2044 // Only notify for live nmethods
2045 if (!nm->is_marked_for_deoptimization()) {
2046 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2047 // Construct abstraction of a dependency.
2048 DependencySignature* current_sig = new DependencySignature(deps);
2049
2050 // Determine if dependency is already checked. table->put(...) returns
2051 // 'true' if the dependency is added (i.e., was not in the hashtable).
2052 if (table->put(*current_sig, 1)) {
2053 if (deps.check_dependency() != NULL) {
2054 // Dependency checking failed. Print out information about the failed
2055 // dependency and finally fail with an assert. We can fail here, since
2056 // dependency checking is never done in a product build.
2057 tty->print_cr("Failed dependency:");
2058 changes.print();
2059 nm->print();
2060 nm->print_dependencies();
2061 assert(false, "Should have been marked for deoptimization");
2062 }
2063 }
2064 }
2065 }
2066 }
2067 }
2068
2069 bool nmethod::check_dependency_on(DepChange& changes) {
2070 // What has happened:
2071 // 1) a new class dependee has been added
2072 // 2) dependee and all its super classes have been marked
2073 bool found_check = false; // set true if we are upset
2074 for (Dependencies::DepStream deps(this); deps.next(); ) {
2075 // Evaluate only relevant dependencies.
2076 if (deps.spot_check_dependency_at(changes) != NULL) {
2077 found_check = true;
2078 NOT_DEBUG(break);
2079 }
2080 }
2081 return found_check;
2082 }
2083
2084 // Called from mark_for_deoptimization, when dependee is invalidated.
2085 bool nmethod::is_dependent_on_method(Method* dependee) {
2086 for (Dependencies::DepStream deps(this); deps.next(); ) {
2087 if (deps.type() != Dependencies::evol_method)
2088 continue;
2089 Method* method = deps.method_argument(0);
2090 if (method == dependee) return true;
2091 }
2092 return false;
2093 }
2094
2095
2096 bool nmethod::is_patchable_at(address instr_addr) {
2097 assert(insts_contains(instr_addr), "wrong nmethod used");
2098 if (is_zombie()) {
2099 // a zombie may never be patched
2100 return false;
2101 }
2102 return true;
2103 }
2104
2105
2106 address nmethod::continuation_for_implicit_exception(address pc) {
2107 // Exception happened outside inline-cache check code => we are inside
2108 // an active nmethod => use cpc to determine a return address
2109 int exception_offset = pc - code_begin();
2110 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2111 #ifdef ASSERT
2112 if (cont_offset == 0) {
2113 Thread* thread = Thread::current();
2114 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2115 HandleMark hm(thread);
2116 ResourceMark rm(thread);
2117 CodeBlob* cb = CodeCache::find_blob(pc);
2118 assert(cb != NULL && cb == this, "");
2119 ttyLocker ttyl;
2120 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2121 // Print all available nmethod info.
2122 print_nmethod(true);
2123 method()->print_codes();
2124 }
2125 #endif
2126 if (cont_offset == 0) {
2127 // Let the normal error handling report the exception
2128 return NULL;
2129 }
2130 return code_begin() + cont_offset;
2131 }
2132
2133
2134 void nmethod_init() {
2135 // make sure you didn't forget to adjust the filler fields
2136 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2137 }
2138
2139
2140 //-------------------------------------------------------------------------------------------
2141
2142
2143 // QQQ might we make this work from a frame??
2144 nmethodLocker::nmethodLocker(address pc) {
2145 CodeBlob* cb = CodeCache::find_blob(pc);
2146 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2147 _nm = cb->as_compiled_method();
2148 lock_nmethod(_nm);
2149 }
2150
2151 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2152 // should pass zombie_ok == true.
2153 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2154 if (cm == NULL) return;
2155 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2156 nmethod* nm = cm->as_nmethod();
2157 Atomic::inc(&nm->_lock_count);
2158 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2159 }
2160
2161 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2162 if (cm == NULL) return;
2163 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2164 nmethod* nm = cm->as_nmethod();
2165 Atomic::dec(&nm->_lock_count);
2166 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2167 }
2168
2169
2170 // -----------------------------------------------------------------------------
2171 // Verification
2172
2173 class VerifyOopsClosure: public OopClosure {
2174 nmethod* _nm;
2175 bool _ok;
2176 public:
2177 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2178 bool ok() { return _ok; }
2179 virtual void do_oop(oop* p) {
2180 if (oopDesc::is_oop_or_null(*p)) return;
2181 // Print diagnostic information before calling print_nmethod().
2182 // Assertions therein might prevent call from returning.
2183 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2184 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2185 if (_ok) {
2186 _nm->print_nmethod(true);
2187 _ok = false;
2188 }
2189 }
2190 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2191 };
2192
2193 void nmethod::verify() {
2194
2195 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2196 // seems odd.
2197
2198 if (is_zombie() || is_not_entrant() || is_unloaded())
2199 return;
2200
2201 // Make sure all the entry points are correctly aligned for patching.
2202 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2203
2204 // assert(oopDesc::is_oop(method()), "must be valid");
2205
2206 ResourceMark rm;
2207
2208 if (!CodeCache::contains(this)) {
2209 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2210 }
2211
2212 if(is_native_method() )
2213 return;
2214
2215 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2216 if (nm != this) {
2217 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2218 }
2219
2220 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2221 if (! p->verify(this)) {
2222 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2223 }
2224 }
2225
2226 VerifyOopsClosure voc(this);
2227 oops_do(&voc);
2228 assert(voc.ok(), "embedded oops must be OK");
2229 Universe::heap()->verify_nmethod(this);
2230
2231 verify_scopes();
2232 }
2233
2234
2235 void nmethod::verify_interrupt_point(address call_site) {
2236 // Verify IC only when nmethod installation is finished.
2237 if (!is_not_installed()) {
2238 if (CompiledICLocker::is_safe(this)) {
2239 CompiledIC_at(this, call_site);
2240 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2241 } else {
2242 CompiledICLocker ml_verify(this);
2243 CompiledIC_at(this, call_site);
2244 }
2245 }
2246
2247 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2248 assert(pd != NULL, "PcDesc must exist");
2249 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2250 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2251 pd->return_oop());
2252 !sd->is_top(); sd = sd->sender()) {
2253 sd->verify();
2254 }
2255 }
2256
2257 void nmethod::verify_scopes() {
2258 if( !method() ) return; // Runtime stubs have no scope
2259 if (method()->is_native()) return; // Ignore stub methods.
2260 // iterate through all interrupt point
2261 // and verify the debug information is valid.
2262 RelocIterator iter((nmethod*)this);
2263 while (iter.next()) {
2264 address stub = NULL;
2265 switch (iter.type()) {
2266 case relocInfo::virtual_call_type:
2267 verify_interrupt_point(iter.addr());
2268 break;
2269 case relocInfo::opt_virtual_call_type:
2270 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2271 verify_interrupt_point(iter.addr());
2272 break;
2273 case relocInfo::static_call_type:
2274 stub = iter.static_call_reloc()->static_stub(false);
2275 //verify_interrupt_point(iter.addr());
2276 break;
2277 case relocInfo::runtime_call_type:
2278 case relocInfo::runtime_call_w_cp_type: {
2279 address destination = iter.reloc()->value();
2280 // Right now there is no way to find out which entries support
2281 // an interrupt point. It would be nice if we had this
2282 // information in a table.
2283 break;
2284 }
2285 default:
2286 break;
2287 }
2288 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2289 }
2290 }
2291
2292
2293 // -----------------------------------------------------------------------------
2294 // Printing operations
2295
2296 void nmethod::print() const {
2297 ttyLocker ttyl; // keep the following output all in one block
2298 print(tty);
2299 }
2300
2301 void nmethod::print(outputStream* st) const {
2302 ResourceMark rm;
2303
2304 st->print("Compiled method ");
2305
2306 if (is_compiled_by_c1()) {
2307 st->print("(c1) ");
2308 } else if (is_compiled_by_c2()) {
2309 st->print("(c2) ");
2310 } else if (is_compiled_by_jvmci()) {
2311 st->print("(JVMCI) ");
2312 } else {
2313 st->print("(n/a) ");
2314 }
2315
2316 print_on(tty, NULL);
2317
2318 if (WizardMode) {
2319 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2320 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2321 st->print(" { ");
2322 st->print_cr("%s ", state());
2323 st->print_cr("}:");
2324 }
2325 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2326 p2i(this),
2327 p2i(this) + size(),
2328 size());
2329 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2330 p2i(relocation_begin()),
2331 p2i(relocation_end()),
2332 relocation_size());
2333 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2334 p2i(consts_begin()),
2335 p2i(consts_end()),
2336 consts_size());
2337 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2338 p2i(insts_begin()),
2339 p2i(insts_end()),
2340 insts_size());
2341 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2342 p2i(stub_begin()),
2343 p2i(stub_end()),
2344 stub_size());
2345 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2346 p2i(oops_begin()),
2347 p2i(oops_end()),
2348 oops_size());
2349 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2350 p2i(metadata_begin()),
2351 p2i(metadata_end()),
2352 metadata_size());
2353 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2354 p2i(scopes_data_begin()),
2355 p2i(scopes_data_end()),
2356 scopes_data_size());
2357 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2358 p2i(scopes_pcs_begin()),
2359 p2i(scopes_pcs_end()),
2360 scopes_pcs_size());
2361 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2362 p2i(dependencies_begin()),
2363 p2i(dependencies_end()),
2364 dependencies_size());
2365 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2366 p2i(handler_table_begin()),
2367 p2i(handler_table_end()),
2368 handler_table_size());
2369 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2370 p2i(nul_chk_table_begin()),
2371 p2i(nul_chk_table_end()),
2372 nul_chk_table_size());
2373 #if INCLUDE_JVMCI
2374 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2375 p2i(speculations_begin()),
2376 p2i(speculations_end()),
2377 speculations_size());
2378 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2379 p2i(jvmci_data_begin()),
2380 p2i(jvmci_data_end()),
2381 jvmci_data_size());
2382 #endif
2383 }
2384
2385 void nmethod::print_code() {
2386 HandleMark hm;
2387 ResourceMark m;
2388 ttyLocker ttyl;
2389 // Call the specialized decode method of this class.
2390 decode(tty);
2391 }
2392
2393 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2394
2395 void nmethod::print_dependencies() {
2396 ResourceMark rm;
2397 ttyLocker ttyl; // keep the following output all in one block
2398 tty->print_cr("Dependencies:");
2399 for (Dependencies::DepStream deps(this); deps.next(); ) {
2400 deps.print_dependency();
2401 Klass* ctxk = deps.context_type();
2402 if (ctxk != NULL) {
2403 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2404 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2405 }
2406 }
2407 deps.log_dependency(); // put it into the xml log also
2408 }
2409 }
2410 #endif
2411
2412 #if defined(SUPPORT_DATA_STRUCTS)
2413
2414 // Print the oops from the underlying CodeBlob.
2415 void nmethod::print_oops(outputStream* st) {
2416 HandleMark hm;
2417 ResourceMark m;
2418 st->print("Oops:");
2419 if (oops_begin() < oops_end()) {
2420 st->cr();
2421 for (oop* p = oops_begin(); p < oops_end(); p++) {
2422 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2423 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2424 if (*p == Universe::non_oop_word()) {
2425 st->print_cr("NON_OOP");
2426 continue; // skip non-oops
2427 }
2428 if (*p == NULL) {
2429 st->print_cr("NULL-oop");
2430 continue; // skip non-oops
2431 }
2432 (*p)->print_value_on(st);
2433 st->cr();
2434 }
2435 } else {
2436 st->print_cr(" <list empty>");
2437 }
2438 }
2439
2440 // Print metadata pool.
2441 void nmethod::print_metadata(outputStream* st) {
2442 HandleMark hm;
2443 ResourceMark m;
2444 st->print("Metadata:");
2445 if (metadata_begin() < metadata_end()) {
2446 st->cr();
2447 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2448 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2449 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2450 if (*p && *p != Universe::non_oop_word()) {
2451 (*p)->print_value_on(st);
2452 }
2453 st->cr();
2454 }
2455 } else {
2456 st->print_cr(" <list empty>");
2457 }
2458 }
2459
2460 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2461 void nmethod::print_scopes_on(outputStream* st) {
2462 // Find the first pc desc for all scopes in the code and print it.
2463 ResourceMark rm;
2464 st->print("scopes:");
2465 if (scopes_pcs_begin() < scopes_pcs_end()) {
2466 st->cr();
2467 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2468 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2469 continue;
2470
2471 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2472 while (sd != NULL) {
2473 sd->print_on(st, p); // print output ends with a newline
2474 sd = sd->sender();
2475 }
2476 }
2477 } else {
2478 st->print_cr(" <list empty>");
2479 }
2480 }
2481 #endif
2482
2483 #ifndef PRODUCT // RelocIterator does support printing only then.
2484 void nmethod::print_relocations() {
2485 ResourceMark m; // in case methods get printed via the debugger
2486 tty->print_cr("relocations:");
2487 RelocIterator iter(this);
2488 iter.print();
2489 }
2490 #endif
2491
2492 void nmethod::print_pcs_on(outputStream* st) {
2493 ResourceMark m; // in case methods get printed via debugger
2494 st->print("pc-bytecode offsets:");
2495 if (scopes_pcs_begin() < scopes_pcs_end()) {
2496 st->cr();
2497 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2498 p->print_on(st, this); // print output ends with a newline
2499 }
2500 } else {
2501 st->print_cr(" <list empty>");
2502 }
2503 }
2504
2505 void nmethod::print_handler_table() {
2506 ExceptionHandlerTable(this).print();
2507 }
2508
2509 void nmethod::print_nul_chk_table() {
2510 ImplicitExceptionTable(this).print(code_begin());
2511 }
2512
2513 void nmethod::print_recorded_oops() {
2514 const int n = oops_count();
2515 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2516 tty->print("Recorded oops:");
2517 if (n > 0) {
2518 tty->cr();
2519 for (int i = 0; i < n; i++) {
2520 oop o = oop_at(i);
2521 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2522 if (o == (oop)Universe::non_oop_word()) {
2523 tty->print("non-oop word");
2524 } else if (o == NULL) {
2525 tty->print("NULL-oop");
2526 } else {
2527 o->print_value_on(tty);
2528 }
2529 tty->cr();
2530 }
2531 } else {
2532 tty->print_cr(" <list empty>");
2533 }
2534 }
2535
2536 void nmethod::print_recorded_metadata() {
2537 const int n = metadata_count();
2538 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2539 tty->print("Recorded metadata:");
2540 if (n > 0) {
2541 tty->cr();
2542 for (int i = 0; i < n; i++) {
2543 Metadata* m = metadata_at(i);
2544 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2545 if (m == (Metadata*)Universe::non_oop_word()) {
2546 tty->print("non-metadata word");
2547 } else if (m == NULL) {
2548 tty->print("NULL-oop");
2549 } else {
2550 Metadata::print_value_on_maybe_null(tty, m);
2551 }
2552 tty->cr();
2553 }
2554 } else {
2555 tty->print_cr(" <list empty>");
2556 }
2557 }
2558 #endif
2559
2560 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2561
2562 void nmethod::print_constant_pool(outputStream* st) {
2563 //-----------------------------------
2564 //---< Print the constant pool >---
2565 //-----------------------------------
2566 int consts_size = this->consts_size();
2567 if ( consts_size > 0 ) {
2568 unsigned char* cstart = this->consts_begin();
2569 unsigned char* cp = cstart;
2570 unsigned char* cend = cp + consts_size;
2571 unsigned int bytes_per_line = 4;
2572 unsigned int CP_alignment = 8;
2573 unsigned int n;
2574
2575 st->cr();
2576
2577 //---< print CP header to make clear what's printed >---
2578 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2579 n = bytes_per_line;
2580 st->print_cr("[Constant Pool]");
2581 Disassembler::print_location(cp, cstart, cend, st, true, true);
2582 Disassembler::print_hexdata(cp, n, st, true);
2583 st->cr();
2584 } else {
2585 n = (uintptr_t)cp&(bytes_per_line-1);
2586 st->print_cr("[Constant Pool (unaligned)]");
2587 }
2588
2589 //---< print CP contents, bytes_per_line at a time >---
2590 while (cp < cend) {
2591 Disassembler::print_location(cp, cstart, cend, st, true, false);
2592 Disassembler::print_hexdata(cp, n, st, false);
2593 cp += n;
2594 n = bytes_per_line;
2595 st->cr();
2596 }
2597
2598 //---< Show potential alignment gap between constant pool and code >---
2599 cend = code_begin();
2600 if( cp < cend ) {
2601 n = 4;
2602 st->print_cr("[Code entry alignment]");
2603 while (cp < cend) {
2604 Disassembler::print_location(cp, cstart, cend, st, false, false);
2605 cp += n;
2606 st->cr();
2607 }
2608 }
2609 } else {
2610 st->print_cr("[Constant Pool (empty)]");
2611 }
2612 st->cr();
2613 }
2614
2615 #endif
2616
2617 // Disassemble this nmethod.
2618 // Print additional debug information, if requested. This could be code
2619 // comments, block comments, profiling counters, etc.
2620 // The undisassembled format is useful no disassembler library is available.
2621 // The resulting hex dump (with markers) can be disassembled later, or on
2622 // another system, when/where a disassembler library is available.
2623 void nmethod::decode2(outputStream* ost) const {
2624
2625 // Called from frame::back_trace_with_decode without ResourceMark.
2626 ResourceMark rm;
2627
2628 // Make sure we have a valid stream to print on.
2629 outputStream* st = ost ? ost : tty;
2630
2631 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2632 const bool use_compressed_format = true;
2633 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2634 AbstractDisassembler::show_block_comment());
2635 #else
2636 const bool use_compressed_format = Disassembler::is_abstract();
2637 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2638 AbstractDisassembler::show_block_comment());
2639 #endif
2640
2641 st->cr();
2642 this->print(st);
2643 st->cr();
2644
2645 #if defined(SUPPORT_ASSEMBLY)
2646 //----------------------------------
2647 //---< Print real disassembly >---
2648 //----------------------------------
2649 if (! use_compressed_format) {
2650 Disassembler::decode(const_cast<nmethod*>(this), st);
2651 return;
2652 }
2653 #endif
2654
2655 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2656
2657 // Compressed undisassembled disassembly format.
2658 // The following stati are defined/supported:
2659 // = 0 - currently at bol() position, nothing printed yet on current line.
2660 // = 1 - currently at position after print_location().
2661 // > 1 - in the midst of printing instruction stream bytes.
2662 int compressed_format_idx = 0;
2663 int code_comment_column = 0;
2664 const int instr_maxlen = Assembler::instr_maxlen();
2665 const uint tabspacing = 8;
2666 unsigned char* start = this->code_begin();
2667 unsigned char* p = this->code_begin();
2668 unsigned char* end = this->code_end();
2669 unsigned char* pss = p; // start of a code section (used for offsets)
2670
2671 if ((start == NULL) || (end == NULL)) {
2672 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2673 return;
2674 }
2675 #endif
2676
2677 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2678 //---< plain abstract disassembly, no comments or anything, just section headers >---
2679 if (use_compressed_format && ! compressed_with_comments) {
2680 const_cast<nmethod*>(this)->print_constant_pool(st);
2681
2682 //---< Open the output (Marker for post-mortem disassembler) >---
2683 st->print_cr("[MachCode]");
2684 const char* header = NULL;
2685 address p0 = p;
2686 while (p < end) {
2687 address pp = p;
2688 while ((p < end) && (header == NULL)) {
2689 header = nmethod_section_label(p);
2690 pp = p;
2691 p += Assembler::instr_len(p);
2692 }
2693 if (pp > p0) {
2694 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2695 p0 = pp;
2696 p = pp;
2697 header = NULL;
2698 } else if (header != NULL) {
2699 st->bol();
2700 st->print_cr("%s", header);
2701 header = NULL;
2702 }
2703 }
2704 //---< Close the output (Marker for post-mortem disassembler) >---
2705 st->bol();
2706 st->print_cr("[/MachCode]");
2707 return;
2708 }
2709 #endif
2710
2711 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2712 //---< abstract disassembly with comments and section headers merged in >---
2713 if (compressed_with_comments) {
2714 const_cast<nmethod*>(this)->print_constant_pool(st);
2715
2716 //---< Open the output (Marker for post-mortem disassembler) >---
2717 st->print_cr("[MachCode]");
2718 while ((p < end) && (p != NULL)) {
2719 const int instruction_size_in_bytes = Assembler::instr_len(p);
2720
2721 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2722 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2723 // Prints nmethod_section_label as well.
2724 if (AbstractDisassembler::show_block_comment()) {
2725 print_block_comment(st, p);
2726 if (st->position() == 0) {
2727 compressed_format_idx = 0;
2728 }
2729 }
2730
2731 //---< New location information after line break >---
2732 if (compressed_format_idx == 0) {
2733 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2734 compressed_format_idx = 1;
2735 }
2736
2737 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2738 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2739 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2740
2741 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2742 //---< interrupt instruction byte stream for code comment >---
2743 if (compressed_format_idx > 1) {
2744 st->cr(); // interrupt byte stream
2745 st->cr(); // add an empty line
2746 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2747 }
2748 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2749 st->bol();
2750 compressed_format_idx = 0;
2751 }
2752
2753 //---< New location information after line break >---
2754 if (compressed_format_idx == 0) {
2755 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2756 compressed_format_idx = 1;
2757 }
2758
2759 //---< Nicely align instructions for readability >---
2760 if (compressed_format_idx > 1) {
2761 Disassembler::print_delimiter(st);
2762 }
2763
2764 //---< Now, finally, print the actual instruction bytes >---
2765 unsigned char* p0 = p;
2766 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2767 compressed_format_idx += p - p0;
2768
2769 if (Disassembler::start_newline(compressed_format_idx-1)) {
2770 st->cr();
2771 compressed_format_idx = 0;
2772 }
2773 }
2774 //---< Close the output (Marker for post-mortem disassembler) >---
2775 st->bol();
2776 st->print_cr("[/MachCode]");
2777 return;
2778 }
2779 #endif
2780 }
2781
2782 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2783
2784 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2785 RelocIterator iter(this, begin, end);
2786 bool have_one = false;
2787 while (iter.next()) {
2788 have_one = true;
2789 switch (iter.type()) {
2790 case relocInfo::none: return "no_reloc";
2791 case relocInfo::oop_type: {
2792 // Get a non-resizable resource-allocated stringStream.
2793 // Our callees make use of (nested) ResourceMarks.
2794 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2795 oop_Relocation* r = iter.oop_reloc();
2796 oop obj = r->oop_value();
2797 st.print("oop(");
2798 if (obj == NULL) st.print("NULL");
2799 else obj->print_value_on(&st);
2800 st.print(")");
2801 return st.as_string();
2802 }
2803 case relocInfo::metadata_type: {
2804 stringStream st;
2805 metadata_Relocation* r = iter.metadata_reloc();
2806 Metadata* obj = r->metadata_value();
2807 st.print("metadata(");
2808 if (obj == NULL) st.print("NULL");
2809 else obj->print_value_on(&st);
2810 st.print(")");
2811 return st.as_string();
2812 }
2813 case relocInfo::runtime_call_type:
2814 case relocInfo::runtime_call_w_cp_type: {
2815 stringStream st;
2816 st.print("runtime_call");
2817 CallRelocation* r = (CallRelocation*)iter.reloc();
2818 address dest = r->destination();
2819 CodeBlob* cb = CodeCache::find_blob(dest);
2820 if (cb != NULL) {
2821 st.print(" %s", cb->name());
2822 } else {
2823 ResourceMark rm;
2824 const int buflen = 1024;
2825 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2826 int offset;
2827 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2828 st.print(" %s", buf);
2829 if (offset != 0) {
2830 st.print("+%d", offset);
2831 }
2832 }
2833 }
2834 return st.as_string();
2835 }
2836 case relocInfo::virtual_call_type: {
2837 stringStream st;
2838 st.print_raw("virtual_call");
2839 virtual_call_Relocation* r = iter.virtual_call_reloc();
2840 Method* m = r->method_value();
2841 if (m != NULL) {
2842 assert(m->is_method(), "");
2843 m->print_short_name(&st);
2844 }
2845 return st.as_string();
2846 }
2847 case relocInfo::opt_virtual_call_type: {
2848 stringStream st;
2849 st.print_raw("optimized virtual_call");
2850 opt_virtual_call_Relocation* r = iter.opt_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::static_call_type: {
2859 stringStream st;
2860 st.print_raw("static_call");
2861 static_call_Relocation* r = iter.static_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_stub_type: return "static_stub";
2870 case relocInfo::external_word_type: return "external_word";
2871 case relocInfo::internal_word_type: return "internal_word";
2872 case relocInfo::section_word_type: return "section_word";
2873 case relocInfo::poll_type: return "poll";
2874 case relocInfo::poll_return_type: return "poll_return";
2875 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2876 case relocInfo::type_mask: return "type_bit_mask";
2877
2878 default:
2879 break;
2880 }
2881 }
2882 return have_one ? "other" : NULL;
2883 }
2884
2885 // Return a the last scope in (begin..end]
2886 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2887 PcDesc* p = pc_desc_near(begin+1);
2888 if (p != NULL && p->real_pc(this) <= end) {
2889 return new ScopeDesc(this, p->scope_decode_offset(),
2890 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2891 p->return_oop());
2892 }
2893 return NULL;
2894 }
2895
2896 const char* nmethod::nmethod_section_label(address pos) const {
2897 const char* label = NULL;
2898 if (pos == code_begin()) label = "[Instructions begin]";
2899 if (pos == entry_point()) label = "[Entry Point]";
2900 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2901 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2902 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2903 // Check stub_code before checking exception_handler or deopt_handler.
2904 if (pos == this->stub_begin()) label = "[Stub Code]";
2905 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2906 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2907 return label;
2908 }
2909
2910 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2911 if (print_section_labels) {
2912 const char* label = nmethod_section_label(block_begin);
2913 if (label != NULL) {
2914 stream->bol();
2915 stream->print_cr("%s", label);
2916 }
2917 }
2918
2919 if (block_begin == entry_point()) {
2920 methodHandle m = method();
2921 if (m.not_null()) {
2922 stream->print(" # ");
2923 m->print_value_on(stream);
2924 stream->cr();
2925 }
2926 if (m.not_null() && !is_osr_method()) {
2927 ResourceMark rm;
2928 int sizeargs = m->size_of_parameters();
2929 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2930 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2931 {
2932 int sig_index = 0;
2933 if (!m->is_static())
2934 sig_bt[sig_index++] = T_OBJECT; // 'this'
2935 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2936 BasicType t = ss.type();
2937 sig_bt[sig_index++] = t;
2938 if (type2size[t] == 2) {
2939 sig_bt[sig_index++] = T_VOID;
2940 } else {
2941 assert(type2size[t] == 1, "size is 1 or 2");
2942 }
2943 }
2944 assert(sig_index == sizeargs, "");
2945 }
2946 const char* spname = "sp"; // make arch-specific?
2947 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2948 int stack_slot_offset = this->frame_size() * wordSize;
2949 int tab1 = 14, tab2 = 24;
2950 int sig_index = 0;
2951 int arg_index = (m->is_static() ? 0 : -1);
2952 bool did_old_sp = false;
2953 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2954 bool at_this = (arg_index == -1);
2955 bool at_old_sp = false;
2956 BasicType t = (at_this ? T_OBJECT : ss.type());
2957 assert(t == sig_bt[sig_index], "sigs in sync");
2958 if (at_this)
2959 stream->print(" # this: ");
2960 else
2961 stream->print(" # parm%d: ", arg_index);
2962 stream->move_to(tab1);
2963 VMReg fst = regs[sig_index].first();
2964 VMReg snd = regs[sig_index].second();
2965 if (fst->is_reg()) {
2966 stream->print("%s", fst->name());
2967 if (snd->is_valid()) {
2968 stream->print(":%s", snd->name());
2969 }
2970 } else if (fst->is_stack()) {
2971 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2972 if (offset == stack_slot_offset) at_old_sp = true;
2973 stream->print("[%s+0x%x]", spname, offset);
2974 } else {
2975 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2976 }
2977 stream->print(" ");
2978 stream->move_to(tab2);
2979 stream->print("= ");
2980 if (at_this) {
2981 m->method_holder()->print_value_on(stream);
2982 } else {
2983 bool did_name = false;
2984 if (!at_this && ss.is_object()) {
2985 Symbol* name = ss.as_symbol_or_null();
2986 if (name != NULL) {
2987 name->print_value_on(stream);
2988 did_name = true;
2989 }
2990 }
2991 if (!did_name)
2992 stream->print("%s", type2name(t));
2993 }
2994 if (at_old_sp) {
2995 stream->print(" (%s of caller)", spname);
2996 did_old_sp = true;
2997 }
2998 stream->cr();
2999 sig_index += type2size[t];
3000 arg_index += 1;
3001 if (!at_this) ss.next();
3002 }
3003 if (!did_old_sp) {
3004 stream->print(" # ");
3005 stream->move_to(tab1);
3006 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3007 stream->print(" (%s of caller)", spname);
3008 stream->cr();
3009 }
3010 }
3011 }
3012 }
3013
3014 // Returns whether this nmethod has code comments.
3015 bool nmethod::has_code_comment(address begin, address end) {
3016 // scopes?
3017 ScopeDesc* sd = scope_desc_in(begin, end);
3018 if (sd != NULL) return true;
3019
3020 // relocations?
3021 const char* str = reloc_string_for(begin, end);
3022 if (str != NULL) return true;
3023
3024 // implicit exceptions?
3025 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3026 if (cont_offset != 0) return true;
3027
3028 return false;
3029 }
3030
3031 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3032 // First, find an oopmap in (begin, end].
3033 // We use the odd half-closed interval so that oop maps and scope descs
3034 // which are tied to the byte after a call are printed with the call itself.
3035 address base = code_begin();
3036 ImmutableOopMapSet* oms = oop_maps();
3037 if (oms != NULL) {
3038 for (int i = 0, imax = oms->count(); i < imax; i++) {
3039 const ImmutableOopMapPair* pair = oms->pair_at(i);
3040 const ImmutableOopMap* om = pair->get_from(oms);
3041 address pc = base + pair->pc_offset();
3042 if (pc > begin) {
3043 if (pc <= end) {
3044 st->move_to(column, 6, 0);
3045 st->print("; ");
3046 om->print_on(st);
3047 }
3048 break;
3049 }
3050 }
3051 }
3052
3053 // Print any debug info present at this pc.
3054 ScopeDesc* sd = scope_desc_in(begin, end);
3055 if (sd != NULL) {
3056 st->move_to(column, 6, 0);
3057 if (sd->bci() == SynchronizationEntryBCI) {
3058 st->print(";*synchronization entry");
3059 } else if (sd->bci() == AfterBci) {
3060 st->print(";* method exit (unlocked if synchronized)");
3061 } else if (sd->bci() == UnwindBci) {
3062 st->print(";* unwind (locked if synchronized)");
3063 } else if (sd->bci() == AfterExceptionBci) {
3064 st->print(";* unwind (unlocked if synchronized)");
3065 } else if (sd->bci() == UnknownBci) {
3066 st->print(";* unknown");
3067 } else if (sd->bci() == InvalidFrameStateBci) {
3068 st->print(";* invalid frame state");
3069 } else {
3070 if (sd->method() == NULL) {
3071 st->print("method is NULL");
3072 } else if (sd->method()->is_native()) {
3073 st->print("method is native");
3074 } else {
3075 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3076 st->print(";*%s", Bytecodes::name(bc));
3077 switch (bc) {
3078 case Bytecodes::_invokevirtual:
3079 case Bytecodes::_invokespecial:
3080 case Bytecodes::_invokestatic:
3081 case Bytecodes::_invokeinterface:
3082 {
3083 Bytecode_invoke invoke(sd->method(), sd->bci());
3084 st->print(" ");
3085 if (invoke.name() != NULL)
3086 invoke.name()->print_symbol_on(st);
3087 else
3088 st->print("<UNKNOWN>");
3089 break;
3090 }
3091 case Bytecodes::_getfield:
3092 case Bytecodes::_putfield:
3093 case Bytecodes::_getstatic:
3094 case Bytecodes::_putstatic:
3095 {
3096 Bytecode_field field(sd->method(), sd->bci());
3097 st->print(" ");
3098 if (field.name() != NULL)
3099 field.name()->print_symbol_on(st);
3100 else
3101 st->print("<UNKNOWN>");
3102 }
3103 default:
3104 break;
3105 }
3106 }
3107 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3108 }
3109
3110 // Print all scopes
3111 for (;sd != NULL; sd = sd->sender()) {
3112 st->move_to(column, 6, 0);
3113 st->print("; -");
3114 if (sd->should_reexecute()) {
3115 st->print(" (reexecute)");
3116 }
3117 if (sd->method() == NULL) {
3118 st->print("method is NULL");
3119 } else {
3120 sd->method()->print_short_name(st);
3121 }
3122 int lineno = sd->method()->line_number_from_bci(sd->bci());
3123 if (lineno != -1) {
3124 st->print("@%d (line %d)", sd->bci(), lineno);
3125 } else {
3126 st->print("@%d", sd->bci());
3127 }
3128 st->cr();
3129 }
3130 }
3131
3132 // Print relocation information
3133 // Prevent memory leak: allocating without ResourceMark.
3134 ResourceMark rm;
3135 const char* str = reloc_string_for(begin, end);
3136 if (str != NULL) {
3137 if (sd != NULL) st->cr();
3138 st->move_to(column, 6, 0);
3139 st->print("; {%s}", str);
3140 }
3141 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3142 if (cont_offset != 0) {
3143 st->move_to(column, 6, 0);
3144 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3145 }
3146
3147 }
3148
3149 #endif
3150
3151 class DirectNativeCallWrapper: public NativeCallWrapper {
3152 private:
3153 NativeCall* _call;
3154
3155 public:
3156 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3157
3158 virtual address destination() const { return _call->destination(); }
3159 virtual address instruction_address() const { return _call->instruction_address(); }
3160 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3161 virtual address return_address() const { return _call->return_address(); }
3162
3163 virtual address get_resolve_call_stub(bool is_optimized) const {
3164 if (is_optimized) {
3165 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3166 }
3167 return SharedRuntime::get_resolve_virtual_call_stub();
3168 }
3169
3170 virtual void set_destination_mt_safe(address dest) {
3171 #if INCLUDE_AOT
3172 if (UseAOT) {
3173 CodeBlob* callee = CodeCache::find_blob(dest);
3174 CompiledMethod* cm = callee->as_compiled_method_or_null();
3175 if (cm != NULL && cm->is_far_code()) {
3176 // Temporary fix, see JDK-8143106
3177 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3178 csc->set_to_far(methodHandle(cm->method()), dest);
3179 return;
3180 }
3181 }
3182 #endif
3183 _call->set_destination_mt_safe(dest);
3184 }
3185
3186 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3187 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3188 #if INCLUDE_AOT
3189 if (info.to_aot()) {
3190 csc->set_to_far(method, info.entry());
3191 } else
3192 #endif
3193 {
3194 csc->set_to_interpreted(method, info.entry());
3195 }
3196 }
3197
3198 virtual void verify() const {
3199 // make sure code pattern is actually a call imm32 instruction
3200 _call->verify();
3201 _call->verify_alignment();
3202 }
3203
3204 virtual void verify_resolve_call(address dest) const {
3205 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3206 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3207 }
3208
3209 virtual bool is_call_to_interpreted(address dest) const {
3210 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3211 return cb->contains(dest);
3212 }
3213
3214 virtual bool is_safe_for_patching() const { return false; }
3215
3216 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3217 return nativeMovConstReg_at(r->cached_value());
3218 }
3219
3220 virtual void *get_data(NativeInstruction* instruction) const {
3221 return (void*)((NativeMovConstReg*) instruction)->data();
3222 }
3223
3224 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3225 ((NativeMovConstReg*) instruction)->set_data(data);
3226 }
3227 };
3228
3229 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3230 return new DirectNativeCallWrapper((NativeCall*) call);
3231 }
3232
3233 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3234 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3235 }
3236
3237 address nmethod::call_instruction_address(address pc) const {
3238 if (NativeCall::is_call_before(pc)) {
3239 NativeCall *ncall = nativeCall_before(pc);
3240 return ncall->instruction_address();
3241 }
3242 return NULL;
3243 }
3244
3245 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3246 return CompiledDirectStaticCall::at(call_site);
3247 }
3248
3249 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3250 return CompiledDirectStaticCall::at(call_site);
3251 }
3252
3253 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3254 return CompiledDirectStaticCall::before(return_addr);
3255 }
3256
3257 #if defined(SUPPORT_DATA_STRUCTS)
3258 void nmethod::print_value_on(outputStream* st) const {
3259 st->print("nmethod");
3260 print_on(st, NULL);
3261 }
3262 #endif
3263
3264 #ifndef PRODUCT
3265
3266 void nmethod::print_calls(outputStream* st) {
3267 RelocIterator iter(this);
3268 while (iter.next()) {
3269 switch (iter.type()) {
3270 case relocInfo::virtual_call_type:
3271 case relocInfo::opt_virtual_call_type: {
3272 CompiledICLocker ml_verify(this);
3273 CompiledIC_at(&iter)->print();
3274 break;
3275 }
3276 case relocInfo::static_call_type:
3277 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3278 CompiledDirectStaticCall::at(iter.reloc())->print();
3279 break;
3280 default:
3281 break;
3282 }
3283 }
3284 }
3285
3286 void nmethod::print_statistics() {
3287 ttyLocker ttyl;
3288 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3289 native_nmethod_stats.print_native_nmethod_stats();
3290 #ifdef COMPILER1
3291 c1_java_nmethod_stats.print_nmethod_stats("C1");
3292 #endif
3293 #ifdef COMPILER2
3294 c2_java_nmethod_stats.print_nmethod_stats("C2");
3295 #endif
3296 #if INCLUDE_JVMCI
3297 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3298 #endif
3299 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3300 DebugInformationRecorder::print_statistics();
3301 #ifndef PRODUCT
3302 pc_nmethod_stats.print_pc_stats();
3303 #endif
3304 Dependencies::print_statistics();
3305 if (xtty != NULL) xtty->tail("statistics");
3306 }
3307
3308 #endif // !PRODUCT
3309
3310 #if INCLUDE_JVMCI
3311 void nmethod::update_speculation(JavaThread* thread) {
3312 jlong speculation = thread->pending_failed_speculation();
3313 if (speculation != 0) {
3314 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3315 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3316 thread->set_pending_failed_speculation(0);
3317 }
3318 }
3319
3320 const char* nmethod::jvmci_name() {
3321 if (jvmci_nmethod_data() != NULL) {
3322 return jvmci_nmethod_data()->name();
3323 }
3324 return NULL;
3325 }
3326 #endif