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