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