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 "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/access.inline.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiImpl.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/deoptimization.hpp"
52 #include "runtime/flags/flagSetting.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/sweeper.hpp"
61 #include "runtime/vmThread.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/dtrace.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/resourceHash.hpp"
66 #include "utilities/xmlstream.hpp"
67 #if INCLUDE_JVMCI
68 #include "jvmci/jvmciJavaClasses.hpp"
69 #endif
70
71 #ifdef DTRACE_ENABLED
72
73 // Only bother with this argument setup if dtrace is available
74
75 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
76 { \
77 Method* m = (method); \
78 if (m != NULL) { \
79 Symbol* klass_name = m->klass_name(); \
80 Symbol* name = m->name(); \
81 Symbol* signature = m->signature(); \
82 HOTSPOT_COMPILED_METHOD_UNLOAD( \
83 (char *) klass_name->bytes(), klass_name->utf8_length(), \
84 (char *) name->bytes(), name->utf8_length(), \
85 (char *) signature->bytes(), signature->utf8_length()); \
86 } \
87 }
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_UNLOAD_PROBE(method)
92
93 #endif
94
95 //---------------------------------------------------------------------------------
96 // NMethod statistics
97 // They are printed under various flags, including:
98 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
99 // (In the latter two cases, they like other stats are printed to the log only.)
100
101 #ifndef PRODUCT
102 // These variables are put into one block to reduce relocations
103 // and make it simpler to print from the debugger.
104 struct java_nmethod_stats_struct {
105 int nmethod_count;
106 int total_size;
107 int relocation_size;
108 int consts_size;
109 int insts_size;
110 int stub_size;
111 int scopes_data_size;
112 int scopes_pcs_size;
113 int dependencies_size;
114 int handler_table_size;
115 int nul_chk_table_size;
116 int oops_size;
117 int metadata_size;
118
119 void note_nmethod(nmethod* nm) {
120 nmethod_count += 1;
121 total_size += nm->size();
122 relocation_size += nm->relocation_size();
123 consts_size += nm->consts_size();
124 insts_size += nm->insts_size();
125 stub_size += nm->stub_size();
126 oops_size += nm->oops_size();
127 metadata_size += nm->metadata_size();
128 scopes_data_size += nm->scopes_data_size();
129 scopes_pcs_size += nm->scopes_pcs_size();
130 dependencies_size += nm->dependencies_size();
131 handler_table_size += nm->handler_table_size();
132 nul_chk_table_size += nm->nul_chk_table_size();
133 }
134 void print_nmethod_stats(const char* name) {
135 if (nmethod_count == 0) return;
136 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
137 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
138 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
139 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
140 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
141 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
142 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
143 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
144 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
145 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
146 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
147 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
148 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
149 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
150 }
151 };
152
153 struct native_nmethod_stats_struct {
154 int native_nmethod_count;
155 int native_total_size;
156 int native_relocation_size;
157 int native_insts_size;
158 int native_oops_size;
159 int native_metadata_size;
160 void note_native_nmethod(nmethod* nm) {
161 native_nmethod_count += 1;
162 native_total_size += nm->size();
163 native_relocation_size += nm->relocation_size();
164 native_insts_size += nm->insts_size();
165 native_oops_size += nm->oops_size();
166 native_metadata_size += nm->metadata_size();
167 }
168 void print_native_nmethod_stats() {
169 if (native_nmethod_count == 0) return;
170 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
171 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
172 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
173 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
174 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
175 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
176 }
177 };
178
179 struct pc_nmethod_stats_struct {
180 int pc_desc_resets; // number of resets (= number of caches)
181 int pc_desc_queries; // queries to nmethod::find_pc_desc
182 int pc_desc_approx; // number of those which have approximate true
183 int pc_desc_repeats; // number of _pc_descs[0] hits
184 int pc_desc_hits; // number of LRU cache hits
185 int pc_desc_tests; // total number of PcDesc examinations
186 int pc_desc_searches; // total number of quasi-binary search steps
187 int pc_desc_adds; // number of LUR cache insertions
188
189 void print_pc_stats() {
190 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
191 pc_desc_queries,
192 (double)(pc_desc_tests + pc_desc_searches)
193 / pc_desc_queries);
194 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
195 pc_desc_resets,
196 pc_desc_queries, pc_desc_approx,
197 pc_desc_repeats, pc_desc_hits,
198 pc_desc_tests, pc_desc_searches, pc_desc_adds);
199 }
200 };
201
202 #ifdef COMPILER1
203 static java_nmethod_stats_struct c1_java_nmethod_stats;
204 #endif
205 #ifdef COMPILER2
206 static java_nmethod_stats_struct c2_java_nmethod_stats;
207 #endif
208 #if INCLUDE_JVMCI
209 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
210 #endif
211 static java_nmethod_stats_struct unknown_java_nmethod_stats;
212
213 static native_nmethod_stats_struct native_nmethod_stats;
214 static pc_nmethod_stats_struct pc_nmethod_stats;
215
216 static void note_java_nmethod(nmethod* nm) {
217 #ifdef COMPILER1
218 if (nm->is_compiled_by_c1()) {
219 c1_java_nmethod_stats.note_nmethod(nm);
220 } else
221 #endif
222 #ifdef COMPILER2
223 if (nm->is_compiled_by_c2()) {
224 c2_java_nmethod_stats.note_nmethod(nm);
225 } else
226 #endif
227 #if INCLUDE_JVMCI
228 if (nm->is_compiled_by_jvmci()) {
229 jvmci_java_nmethod_stats.note_nmethod(nm);
230 } else
231 #endif
232 {
233 unknown_java_nmethod_stats.note_nmethod(nm);
234 }
235 }
236 #endif // !PRODUCT
237
238 //---------------------------------------------------------------------------------
239
240
241 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
242 assert(pc != NULL, "Must be non null");
243 assert(exception.not_null(), "Must be non null");
244 assert(handler != NULL, "Must be non null");
245
246 _count = 0;
247 _exception_type = exception->klass();
248 _next = NULL;
249 _purge_list_next = NULL;
250
251 add_address_and_handler(pc,handler);
252 }
253
254
255 address ExceptionCache::match(Handle exception, address pc) {
256 assert(pc != NULL,"Must be non null");
257 assert(exception.not_null(),"Must be non null");
258 if (exception->klass() == exception_type()) {
259 return (test_address(pc));
260 }
261
262 return NULL;
263 }
264
265
266 bool ExceptionCache::match_exception_with_space(Handle exception) {
267 assert(exception.not_null(),"Must be non null");
268 if (exception->klass() == exception_type() && count() < cache_size) {
269 return true;
270 }
271 return false;
272 }
273
274
275 address ExceptionCache::test_address(address addr) {
276 int limit = count();
277 for (int i = 0; i < limit; i++) {
278 if (pc_at(i) == addr) {
279 return handler_at(i);
280 }
281 }
282 return NULL;
283 }
284
285
286 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
287 if (test_address(addr) == handler) return true;
288
289 int index = count();
290 if (index < cache_size) {
291 set_pc_at(index, addr);
292 set_handler_at(index, handler);
293 increment_count();
294 return true;
295 }
296 return false;
297 }
298
299 ExceptionCache* ExceptionCache::next() {
300 return Atomic::load(&_next);
301 }
302
303 void ExceptionCache::set_next(ExceptionCache *ec) {
304 Atomic::store(ec, &_next);
305 }
306
307 //-----------------------------------------------------------------------------
308
309
310 // Helper used by both find_pc_desc methods.
311 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
313 if (!approximate)
314 return pc->pc_offset() == pc_offset;
315 else
316 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
317 }
318
319 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
320 if (initial_pc_desc == NULL) {
321 _pc_descs[0] = NULL; // native method; no PcDescs at all
322 return;
323 }
324 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
325 // reset the cache by filling it with benign (non-null) values
326 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
327 for (int i = 0; i < cache_size; i++)
328 _pc_descs[i] = initial_pc_desc;
329 }
330
331 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
332 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
333 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
334
335 // Note: one might think that caching the most recently
336 // read value separately would be a win, but one would be
337 // wrong. When many threads are updating it, the cache
338 // line it's in would bounce between caches, negating
339 // any benefit.
340
341 // In order to prevent race conditions do not load cache elements
342 // repeatedly, but use a local copy:
343 PcDesc* res;
344
345 // Step one: Check the most recently added value.
346 res = _pc_descs[0];
347 if (res == NULL) return NULL; // native method; no PcDescs at all
348 if (match_desc(res, pc_offset, approximate)) {
349 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
350 return res;
351 }
352
353 // Step two: Check the rest of the LRU cache.
354 for (int i = 1; i < cache_size; ++i) {
355 res = _pc_descs[i];
356 if (res->pc_offset() < 0) break; // optimization: skip empty cache
357 if (match_desc(res, pc_offset, approximate)) {
358 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
359 return res;
360 }
361 }
362
363 // Report failure.
364 return NULL;
365 }
366
367 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
368 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
369 // Update the LRU cache by shifting pc_desc forward.
370 for (int i = 0; i < cache_size; i++) {
371 PcDesc* next = _pc_descs[i];
372 _pc_descs[i] = pc_desc;
373 pc_desc = next;
374 }
375 }
376
377 // adjust pcs_size so that it is a multiple of both oopSize and
378 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
379 // of oopSize, then 2*sizeof(PcDesc) is)
380 static int adjust_pcs_size(int pcs_size) {
381 int nsize = align_up(pcs_size, oopSize);
382 if ((nsize % sizeof(PcDesc)) != 0) {
383 nsize = pcs_size + sizeof(PcDesc);
384 }
385 assert((nsize % oopSize) == 0, "correct alignment");
386 return nsize;
387 }
388
389
390 int nmethod::total_size() const {
391 return
392 consts_size() +
393 insts_size() +
394 stub_size() +
395 scopes_data_size() +
396 scopes_pcs_size() +
397 handler_table_size() +
398 nul_chk_table_size();
399 }
400
401 address* nmethod::orig_pc_addr(const frame* fr) {
402 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
403 }
404
405 const char* nmethod::compile_kind() const {
406 if (is_osr_method()) return "osr";
407 if (method() != NULL && is_native_method()) return "c2n";
408 return NULL;
409 }
410
411 // Fill in default values for various flag fields
412 void nmethod::init_defaults() {
413 _state = not_installed;
414 _has_flushed_dependencies = 0;
415 _lock_count = 0;
416 _stack_traversal_mark = 0;
417 _unload_reported = false; // jvmti state
418 _is_far_code = false; // nmethods are located in CodeCache
419
420 #ifdef ASSERT
421 _oops_are_stale = false;
422 #endif
423
424 _oops_do_mark_link = NULL;
425 _jmethod_id = NULL;
426 _osr_link = NULL;
427 #if INCLUDE_RTM_OPT
428 _rtm_state = NoRTM;
429 #endif
430 #if INCLUDE_JVMCI
431 _jvmci_installed_code = NULL;
432 _speculation_log = NULL;
433 _jvmci_installed_code_triggers_invalidation = false;
434 #endif
435 }
436
437 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
438 int compile_id,
439 CodeBuffer *code_buffer,
440 int vep_offset,
441 int frame_complete,
442 int frame_size,
443 ByteSize basic_lock_owner_sp_offset,
444 ByteSize basic_lock_sp_offset,
445 OopMapSet* oop_maps) {
446 code_buffer->finalize_oop_references(method);
447 // create nmethod
448 nmethod* nm = NULL;
449 {
450 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
451 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
452 CodeOffsets offsets;
453 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
454 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
455 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
456 compile_id, &offsets,
457 code_buffer, frame_size,
458 basic_lock_owner_sp_offset,
459 basic_lock_sp_offset, oop_maps);
460 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
461 }
462
463 if (nm != NULL) {
464 // verify nmethod
465 debug_only(nm->verify();) // might block
466
467 nm->log_new_nmethod();
468 nm->make_in_use();
469 }
470 return nm;
471 }
472
473 nmethod* nmethod::new_nmethod(const methodHandle& method,
474 int compile_id,
475 int entry_bci,
476 CodeOffsets* offsets,
477 int orig_pc_offset,
478 DebugInformationRecorder* debug_info,
479 Dependencies* dependencies,
480 CodeBuffer* code_buffer, int frame_size,
481 OopMapSet* oop_maps,
482 ExceptionHandlerTable* handler_table,
483 ImplicitExceptionTable* nul_chk_table,
484 AbstractCompiler* compiler,
485 int comp_level
486 #if INCLUDE_JVMCI
487 , jweak installed_code,
488 jweak speculationLog
489 #endif
490 )
491 {
492 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
493 code_buffer->finalize_oop_references(method);
494 // create nmethod
495 nmethod* nm = NULL;
496 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
497 int nmethod_size =
498 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
499 + adjust_pcs_size(debug_info->pcs_size())
500 + align_up((int)dependencies->size_in_bytes(), oopSize)
501 + align_up(handler_table->size_in_bytes() , oopSize)
502 + align_up(nul_chk_table->size_in_bytes() , oopSize)
503 + align_up(debug_info->data_size() , oopSize);
504
505 nm = new (nmethod_size, comp_level)
506 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
507 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
508 oop_maps,
509 handler_table,
510 nul_chk_table,
511 compiler,
512 comp_level
513 #if INCLUDE_JVMCI
514 , installed_code,
515 speculationLog
516 #endif
517 );
518
519 if (nm != NULL) {
520 // To make dependency checking during class loading fast, record
521 // the nmethod dependencies in the classes it is dependent on.
522 // This allows the dependency checking code to simply walk the
523 // class hierarchy above the loaded class, checking only nmethods
524 // which are dependent on those classes. The slow way is to
525 // check every nmethod for dependencies which makes it linear in
526 // the number of methods compiled. For applications with a lot
527 // classes the slow way is too slow.
528 for (Dependencies::DepStream deps(nm); deps.next(); ) {
529 if (deps.type() == Dependencies::call_site_target_value) {
530 // CallSite dependencies are managed on per-CallSite instance basis.
531 oop call_site = deps.argument_oop(0);
532 MethodHandles::add_dependent_nmethod(call_site, nm);
533 } else {
534 Klass* klass = deps.context_type();
535 if (klass == NULL) {
536 continue; // ignore things like evol_method
537 }
538 // record this nmethod as dependent on this klass
539 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
540 }
541 }
542 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
543 }
544 }
545 // Do verification and logging outside CodeCache_lock.
546 if (nm != NULL) {
547 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
548 DEBUG_ONLY(nm->verify();)
549 nm->log_new_nmethod();
550 }
551 return nm;
552 }
553
554 // For native wrappers
555 nmethod::nmethod(
556 Method* method,
557 CompilerType type,
558 int nmethod_size,
559 int compile_id,
560 CodeOffsets* offsets,
561 CodeBuffer* code_buffer,
562 int frame_size,
563 ByteSize basic_lock_owner_sp_offset,
564 ByteSize basic_lock_sp_offset,
565 OopMapSet* oop_maps )
566 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
567 _is_unloading_state(0),
568 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
569 _native_basic_lock_sp_offset(basic_lock_sp_offset)
570 {
571 {
572 int scopes_data_offset = 0;
573 int deoptimize_offset = 0;
574 int deoptimize_mh_offset = 0;
575
576 debug_only(NoSafepointVerifier nsv;)
577 assert_locked_or_safepoint(CodeCache_lock);
578
579 init_defaults();
580 _entry_bci = InvocationEntryBci;
581 // We have no exception handler or deopt handler make the
582 // values something that will never match a pc like the nmethod vtable entry
583 _exception_offset = 0;
584 _orig_pc_offset = 0;
585
586 _consts_offset = data_offset();
587 _stub_offset = data_offset();
588 _oops_offset = data_offset();
589 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
590 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
591 _scopes_pcs_offset = scopes_data_offset;
592 _dependencies_offset = _scopes_pcs_offset;
593 _handler_table_offset = _dependencies_offset;
594 _nul_chk_table_offset = _handler_table_offset;
595 _nmethod_end_offset = _nul_chk_table_offset;
596 _compile_id = compile_id;
597 _comp_level = CompLevel_none;
598 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
599 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
600 _osr_entry_point = NULL;
601 _exception_cache = NULL;
602 _pc_desc_container.reset_to(NULL);
603 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
604
605 _scopes_data_begin = (address) this + scopes_data_offset;
606 _deopt_handler_begin = (address) this + deoptimize_offset;
607 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
608
609 code_buffer->copy_code_and_locs_to(this);
610 code_buffer->copy_values_to(this);
611
612 clear_unloading_state();
613
614 Universe::heap()->register_nmethod(this);
615 debug_only(Universe::heap()->verify_nmethod(this));
616
617 CodeCache::commit(this);
618 }
619
620 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
621 ttyLocker ttyl; // keep the following output all in one block
622 // This output goes directly to the tty, not the compiler log.
623 // To enable tools to match it up with the compilation activity,
624 // be sure to tag this tty output with the compile ID.
625 if (xtty != NULL) {
626 xtty->begin_head("print_native_nmethod");
627 xtty->method(_method);
628 xtty->stamp();
629 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
630 }
631 // print the header part first
632 print();
633 // then print the requested information
634 if (PrintNativeNMethods) {
635 print_code();
636 if (oop_maps != NULL) {
637 oop_maps->print();
638 }
639 }
640 if (PrintRelocations) {
641 print_relocations();
642 }
643 if (xtty != NULL) {
644 xtty->tail("print_native_nmethod");
645 }
646 }
647 }
648
649 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
650 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
651 }
652
653 nmethod::nmethod(
654 Method* method,
655 CompilerType type,
656 int nmethod_size,
657 int compile_id,
658 int entry_bci,
659 CodeOffsets* offsets,
660 int orig_pc_offset,
661 DebugInformationRecorder* debug_info,
662 Dependencies* dependencies,
663 CodeBuffer *code_buffer,
664 int frame_size,
665 OopMapSet* oop_maps,
666 ExceptionHandlerTable* handler_table,
667 ImplicitExceptionTable* nul_chk_table,
668 AbstractCompiler* compiler,
669 int comp_level
670 #if INCLUDE_JVMCI
671 , jweak installed_code,
672 jweak speculation_log
673 #endif
674 )
675 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
676 _is_unloading_state(0),
677 _native_receiver_sp_offset(in_ByteSize(-1)),
678 _native_basic_lock_sp_offset(in_ByteSize(-1))
679 {
680 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
681 {
682 debug_only(NoSafepointVerifier nsv;)
683 assert_locked_or_safepoint(CodeCache_lock);
684
685 _deopt_handler_begin = (address) this;
686 _deopt_mh_handler_begin = (address) this;
687
688 init_defaults();
689 _entry_bci = entry_bci;
690 _compile_id = compile_id;
691 _comp_level = comp_level;
692 _orig_pc_offset = orig_pc_offset;
693 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
694
695 // Section offsets
696 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
697 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
698 set_ctable_begin(header_begin() + _consts_offset);
699
700 #if INCLUDE_JVMCI
701 _jvmci_installed_code = installed_code;
702 _speculation_log = speculation_log;
703 oop obj = JNIHandles::resolve(installed_code);
704 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
705 _jvmci_installed_code_triggers_invalidation = false;
706 } else {
707 _jvmci_installed_code_triggers_invalidation = true;
708 }
709
710 if (compiler->is_jvmci()) {
711 // JVMCI might not produce any stub sections
712 if (offsets->value(CodeOffsets::Exceptions) != -1) {
713 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
714 } else {
715 _exception_offset = -1;
716 }
717 if (offsets->value(CodeOffsets::Deopt) != -1) {
718 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
719 } else {
720 _deopt_handler_begin = NULL;
721 }
722 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
723 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
724 } else {
725 _deopt_mh_handler_begin = NULL;
726 }
727 } else {
728 #endif
729 // Exception handler and deopt handler are in the stub section
730 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
731 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
732
733 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
734 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
735 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
736 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
737 } else {
738 _deopt_mh_handler_begin = NULL;
739 #if INCLUDE_JVMCI
740 }
741 #endif
742 }
743 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
744 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
745 } else {
746 _unwind_handler_offset = -1;
747 }
748
749 _oops_offset = data_offset();
750 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
751 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
752
753 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
754 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
755 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
756 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
757 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
758 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
759 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
760 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
761 _exception_cache = NULL;
762
763 _scopes_data_begin = (address) this + scopes_data_offset;
764
765 _pc_desc_container.reset_to(scopes_pcs_begin());
766
767 code_buffer->copy_code_and_locs_to(this);
768 // Copy contents of ScopeDescRecorder to nmethod
769 code_buffer->copy_values_to(this);
770 debug_info->copy_to(this);
771 dependencies->copy_to(this);
772 clear_unloading_state();
773
774 Universe::heap()->register_nmethod(this);
775 debug_only(Universe::heap()->verify_nmethod(this));
776
777 CodeCache::commit(this);
778
779 // Copy contents of ExceptionHandlerTable to nmethod
780 handler_table->copy_to(this);
781 nul_chk_table->copy_to(this);
782
783 // we use the information of entry points to find out if a method is
784 // static or non static
785 assert(compiler->is_c2() || compiler->is_jvmci() ||
786 _method->is_static() == (entry_point() == _verified_entry_point),
787 " entry points must be same for static methods and vice versa");
788 }
789 }
790
791 // Print a short set of xml attributes to identify this nmethod. The
792 // output should be embedded in some other element.
793 void nmethod::log_identity(xmlStream* log) const {
794 log->print(" compile_id='%d'", compile_id());
795 const char* nm_kind = compile_kind();
796 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
797 log->print(" compiler='%s'", compiler_name());
798 if (TieredCompilation) {
799 log->print(" level='%d'", comp_level());
800 }
801 #if INCLUDE_JVMCI
802 char buffer[O_BUFLEN];
803 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN);
804 if (jvmci_name != NULL) {
805 log->print(" jvmci_installed_code_name='");
806 log->text("%s", jvmci_name);
807 log->print("'");
808 }
809 #endif
810 }
811
812
813 #define LOG_OFFSET(log, name) \
814 if (p2i(name##_end()) - p2i(name##_begin())) \
815 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
816 p2i(name##_begin()) - p2i(this))
817
818
819 void nmethod::log_new_nmethod() const {
820 if (LogCompilation && xtty != NULL) {
821 ttyLocker ttyl;
822 HandleMark hm;
823 xtty->begin_elem("nmethod");
824 log_identity(xtty);
825 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
826 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
827
828 LOG_OFFSET(xtty, relocation);
829 LOG_OFFSET(xtty, consts);
830 LOG_OFFSET(xtty, insts);
831 LOG_OFFSET(xtty, stub);
832 LOG_OFFSET(xtty, scopes_data);
833 LOG_OFFSET(xtty, scopes_pcs);
834 LOG_OFFSET(xtty, dependencies);
835 LOG_OFFSET(xtty, handler_table);
836 LOG_OFFSET(xtty, nul_chk_table);
837 LOG_OFFSET(xtty, oops);
838 LOG_OFFSET(xtty, metadata);
839
840 xtty->method(method());
841 xtty->stamp();
842 xtty->end_elem();
843 }
844 }
845
846 #undef LOG_OFFSET
847
848
849 // Print out more verbose output usually for a newly created nmethod.
850 void nmethod::print_on(outputStream* st, const char* msg) const {
851 if (st != NULL) {
852 ttyLocker ttyl;
853 if (WizardMode) {
854 CompileTask::print(st, this, msg, /*short_form:*/ true);
855 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
856 } else {
857 CompileTask::print(st, this, msg, /*short_form:*/ false);
858 }
859 }
860 }
861
862 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
863 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
864 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
865 print_nmethod(printnmethods);
866 }
867 }
868
869 void nmethod::print_nmethod(bool printmethod) {
870 ttyLocker ttyl; // keep the following output all in one block
871 if (xtty != NULL) {
872 xtty->begin_head("print_nmethod");
873 xtty->stamp();
874 xtty->end_head();
875 }
876 // print the header part first
877 print();
878 // then print the requested information
879 if (printmethod) {
880 print_code();
881 print_pcs();
882 if (oop_maps()) {
883 oop_maps()->print();
884 }
885 }
886 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
887 print_scopes();
888 }
889 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
890 print_relocations();
891 }
892 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
893 print_dependencies();
894 }
895 if (printmethod || PrintExceptionHandlers) {
896 print_handler_table();
897 print_nul_chk_table();
898 }
899 if (printmethod) {
900 print_recorded_oops();
901 print_recorded_metadata();
902 }
903 if (xtty != NULL) {
904 xtty->tail("print_nmethod");
905 }
906 }
907
908
909 // Promote one word from an assembly-time handle to a live embedded oop.
910 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
911 if (handle == NULL ||
912 // As a special case, IC oops are initialized to 1 or -1.
913 handle == (jobject) Universe::non_oop_word()) {
914 (*dest) = (oop) handle;
915 } else {
916 (*dest) = JNIHandles::resolve_non_null(handle);
917 }
918 }
919
920
921 // Have to have the same name because it's called by a template
922 void nmethod::copy_values(GrowableArray<jobject>* array) {
923 int length = array->length();
924 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
925 oop* dest = oops_begin();
926 for (int index = 0 ; index < length; index++) {
927 initialize_immediate_oop(&dest[index], array->at(index));
928 }
929
930 // Now we can fix up all the oops in the code. We need to do this
931 // in the code because the assembler uses jobjects as placeholders.
932 // The code and relocations have already been initialized by the
933 // CodeBlob constructor, so it is valid even at this early point to
934 // iterate over relocations and patch the code.
935 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
936 }
937
938 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
939 int length = array->length();
940 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
941 Metadata** dest = metadata_begin();
942 for (int index = 0 ; index < length; index++) {
943 dest[index] = array->at(index);
944 }
945 }
946
947 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
948 // re-patch all oop-bearing instructions, just in case some oops moved
949 RelocIterator iter(this, begin, end);
950 while (iter.next()) {
951 if (iter.type() == relocInfo::oop_type) {
952 oop_Relocation* reloc = iter.oop_reloc();
953 if (initialize_immediates && reloc->oop_is_immediate()) {
954 oop* dest = reloc->oop_addr();
955 initialize_immediate_oop(dest, (jobject) *dest);
956 }
957 // Refresh the oop-related bits of this instruction.
958 reloc->fix_oop_relocation();
959 } else if (iter.type() == relocInfo::metadata_type) {
960 metadata_Relocation* reloc = iter.metadata_reloc();
961 reloc->fix_metadata_relocation();
962 }
963 }
964 }
965
966
967 void nmethod::verify_clean_inline_caches() {
968 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
969
970 ResourceMark rm;
971 RelocIterator iter(this, oops_reloc_begin());
972 while(iter.next()) {
973 switch(iter.type()) {
974 case relocInfo::virtual_call_type:
975 case relocInfo::opt_virtual_call_type: {
976 CompiledIC *ic = CompiledIC_at(&iter);
977 // Ok, to lookup references to zombies here
978 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
979 assert(cb != NULL, "destination not in CodeBlob?");
980 nmethod* nm = cb->as_nmethod_or_null();
981 if( nm != NULL ) {
982 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
983 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
984 assert(ic->is_clean(), "IC should be clean");
985 }
986 }
987 break;
988 }
989 case relocInfo::static_call_type: {
990 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
991 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
992 assert(cb != NULL, "destination not in CodeBlob?");
993 nmethod* nm = cb->as_nmethod_or_null();
994 if( nm != NULL ) {
995 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
996 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
997 assert(csc->is_clean(), "IC should be clean");
998 }
999 }
1000 break;
1001 }
1002 default:
1003 break;
1004 }
1005 }
1006 }
1007
1008 // This is a private interface with the sweeper.
1009 void nmethod::mark_as_seen_on_stack() {
1010 assert(is_alive(), "Must be an alive method");
1011 // Set the traversal mark to ensure that the sweeper does 2
1012 // cleaning passes before moving to zombie.
1013 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1014 }
1015
1016 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1017 // there are no activations on the stack, not in use by the VM,
1018 // and not in use by the ServiceThread)
1019 bool nmethod::can_convert_to_zombie() {
1020 // Note that this is called when the sweeper has observed the nmethod to be
1021 // not_entrant. However, with concurrent code cache unloading, the state
1022 // might have moved on to unloaded if it is_unloading(), due to racing
1023 // concurrent GC threads.
1024 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1025
1026 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1027 // count can be greater than the stack traversal count before it hits the
1028 // nmethod for the second time.
1029 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1030 // convert it to zombie due to GC unloading interactions. However, if it
1031 // has become unloaded, then it is okay to convert such nmethods to zombie.
1032 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1033 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1034 }
1035
1036 void nmethod::inc_decompile_count() {
1037 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1038 // Could be gated by ProfileTraps, but do not bother...
1039 Method* m = method();
1040 if (m == NULL) return;
1041 MethodData* mdo = m->method_data();
1042 if (mdo == NULL) return;
1043 // There is a benign race here. See comments in methodData.hpp.
1044 mdo->inc_decompile_count();
1045 }
1046
1047 void nmethod::make_unloaded() {
1048 post_compiled_method_unload();
1049
1050 // This nmethod is being unloaded, make sure that dependencies
1051 // recorded in instanceKlasses get flushed.
1052 // Since this work is being done during a GC, defer deleting dependencies from the
1053 // InstanceKlass.
1054 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1055 "should only be called during gc");
1056 flush_dependencies(/*delete_immediately*/false);
1057
1058 // Break cycle between nmethod & method
1059 LogTarget(Trace, class, unload, nmethod) lt;
1060 if (lt.is_enabled()) {
1061 LogStream ls(lt);
1062 ls.print("making nmethod " INTPTR_FORMAT
1063 " unloadable, Method*(" INTPTR_FORMAT
1064 ") ",
1065 p2i(this), p2i(_method));
1066 ls.cr();
1067 }
1068 // Unlink the osr method, so we do not look this up again
1069 if (is_osr_method()) {
1070 // Invalidate the osr nmethod only once
1071 if (is_in_use()) {
1072 invalidate_osr_method();
1073 }
1074 #ifdef ASSERT
1075 if (method() != NULL) {
1076 // Make sure osr nmethod is invalidated, i.e. not on the list
1077 bool found = method()->method_holder()->remove_osr_nmethod(this);
1078 assert(!found, "osr nmethod should have been invalidated");
1079 }
1080 #endif
1081 }
1082
1083 // If _method is already NULL the Method* is about to be unloaded,
1084 // so we don't have to break the cycle. Note that it is possible to
1085 // have the Method* live here, in case we unload the nmethod because
1086 // it is pointing to some oop (other than the Method*) being unloaded.
1087 Method::unlink_code(_method, this); // Break a cycle
1088
1089 // Make the class unloaded - i.e., change state and notify sweeper
1090 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1091 "must be at safepoint");
1092
1093 {
1094 // Clear ICStubs and release any CompiledICHolders.
1095 CompiledICLocker ml(this);
1096 clear_ic_callsites();
1097 }
1098
1099 // Unregister must be done before the state change
1100 {
1101 MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1102 Mutex::_no_safepoint_check_flag);
1103 Universe::heap()->unregister_nmethod(this);
1104 CodeCache::unregister_old_nmethod(this);
1105 }
1106
1107 // Clear the method of this dead nmethod
1108 set_method(NULL);
1109
1110 // Log the unloading.
1111 log_state_change();
1112
1113 #if INCLUDE_JVMCI
1114 // The method can only be unloaded after the pointer to the installed code
1115 // Java wrapper is no longer alive. Here we need to clear out this weak
1116 // reference to the dead object.
1117 maybe_invalidate_installed_code();
1118 #endif
1119
1120 // The Method* is gone at this point
1121 assert(_method == NULL, "Tautology");
1122
1123 set_osr_link(NULL);
1124 NMethodSweeper::report_state_change(this);
1125
1126 // The release is only needed for compile-time ordering, as accesses
1127 // into the nmethod after the store are not safe due to the sweeper
1128 // being allowed to free it when the store is observed, during
1129 // concurrent nmethod unloading. Therefore, there is no need for
1130 // acquire on the loader side.
1131 OrderAccess::release_store(&_state, (signed char)unloaded);
1132 }
1133
1134 void nmethod::invalidate_osr_method() {
1135 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1136 // Remove from list of active nmethods
1137 if (method() != NULL) {
1138 method()->method_holder()->remove_osr_nmethod(this);
1139 }
1140 }
1141
1142 void nmethod::log_state_change() const {
1143 if (LogCompilation) {
1144 if (xtty != NULL) {
1145 ttyLocker ttyl; // keep the following output all in one block
1146 if (_state == unloaded) {
1147 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1148 os::current_thread_id());
1149 } else {
1150 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1151 os::current_thread_id(),
1152 (_state == zombie ? " zombie='1'" : ""));
1153 }
1154 log_identity(xtty);
1155 xtty->stamp();
1156 xtty->end_elem();
1157 }
1158 }
1159
1160 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1161 CompileTask::print_ul(this, state_msg);
1162 if (PrintCompilation && _state != unloaded) {
1163 print_on(tty, state_msg);
1164 }
1165 }
1166
1167 void nmethod::unlink_from_method() {
1168 // We need to check if both the _code and _from_compiled_code_entry_point
1169 // refer to this nmethod because there is a race in setting these two fields
1170 // in Method* as seen in bugid 4947125.
1171 // If the vep() points to the zombie nmethod, the memory for the nmethod
1172 // could be flushed and the compiler and vtable stubs could still call
1173 // through it.
1174 Method::unlink_code(method(), this);
1175 }
1176
1177 /**
1178 * Common functionality for both make_not_entrant and make_zombie
1179 */
1180 bool nmethod::make_not_entrant_or_zombie(int state) {
1181 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1182 assert(!is_zombie(), "should not already be a zombie");
1183
1184 if (_state == state) {
1185 // Avoid taking the lock if already in required state.
1186 // This is safe from races because the state is an end-state,
1187 // which the nmethod cannot back out of once entered.
1188 // No need for fencing either.
1189 return false;
1190 }
1191
1192 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1193 nmethodLocker nml(this);
1194 methodHandle the_method(method());
1195 // This can be called while the system is already at a safepoint which is ok
1196 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1197
1198 // during patching, depending on the nmethod state we must notify the GC that
1199 // code has been unloaded, unregistering it. We cannot do this right while
1200 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1201 // would be prone to deadlocks.
1202 // This flag is used to remember whether we need to later lock and unregister.
1203 bool nmethod_needs_unregister = false;
1204
1205 // invalidate osr nmethod before acquiring the patching lock since
1206 // they both acquire leaf locks and we don't want a deadlock.
1207 // This logic is equivalent to the logic below for patching the
1208 // verified entry point of regular methods. We check that the
1209 // nmethod is in use to ensure that it is invalidated only once.
1210 if (is_osr_method() && is_in_use()) {
1211 // this effectively makes the osr nmethod not entrant
1212 invalidate_osr_method();
1213 }
1214
1215 {
1216 // Enter critical section. Does not block for safepoint.
1217 MutexLockerEx pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1218
1219 if (_state == state) {
1220 // another thread already performed this transition so nothing
1221 // to do, but return false to indicate this.
1222 return false;
1223 }
1224
1225 // The caller can be calling the method statically or through an inline
1226 // cache call.
1227 if (!is_osr_method() && !is_not_entrant()) {
1228 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1229 SharedRuntime::get_handle_wrong_method_stub());
1230 }
1231
1232 if (is_in_use() && update_recompile_counts()) {
1233 // It's a true state change, so mark the method as decompiled.
1234 // Do it only for transition from alive.
1235 inc_decompile_count();
1236 }
1237
1238 // If the state is becoming a zombie, signal to unregister the nmethod with
1239 // the heap.
1240 // This nmethod may have already been unloaded during a full GC.
1241 if ((state == zombie) && !is_unloaded()) {
1242 nmethod_needs_unregister = true;
1243 }
1244
1245 // Must happen before state change. Otherwise we have a race condition in
1246 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1247 // transition its state from 'not_entrant' to 'zombie' without having to wait
1248 // for stack scanning.
1249 if (state == not_entrant) {
1250 mark_as_seen_on_stack();
1251 OrderAccess::storestore(); // _stack_traversal_mark and _state
1252 }
1253
1254 // Change state
1255 _state = state;
1256
1257 // Log the transition once
1258 log_state_change();
1259
1260 // Invalidate while holding the patching lock
1261 JVMCI_ONLY(maybe_invalidate_installed_code());
1262
1263 // Remove nmethod from method.
1264 unlink_from_method();
1265
1266 } // leave critical region under CompiledMethod_lock
1267
1268 #ifdef ASSERT
1269 if (is_osr_method() && method() != NULL) {
1270 // Make sure osr nmethod is invalidated, i.e. not on the list
1271 bool found = method()->method_holder()->remove_osr_nmethod(this);
1272 assert(!found, "osr nmethod should have been invalidated");
1273 }
1274 #endif
1275
1276 // When the nmethod becomes zombie it is no longer alive so the
1277 // dependencies must be flushed. nmethods in the not_entrant
1278 // state will be flushed later when the transition to zombie
1279 // happens or they get unloaded.
1280 if (state == zombie) {
1281 {
1282 // Flushing dependencies must be done before any possible
1283 // safepoint can sneak in, otherwise the oops used by the
1284 // dependency logic could have become stale.
1285 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1286 if (nmethod_needs_unregister) {
1287 Universe::heap()->unregister_nmethod(this);
1288 CodeCache::unregister_old_nmethod(this);
1289 }
1290 flush_dependencies(/*delete_immediately*/true);
1291 }
1292
1293 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1294 // nmethods during the next safepoint (see ICStub::finalize), as well
1295 // as to free up CompiledICHolder resources.
1296 {
1297 CompiledICLocker ml(this);
1298 clear_ic_callsites();
1299 }
1300
1301 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1302 // event and it hasn't already been reported for this nmethod then
1303 // report it now. The event may have been reported earlier if the GC
1304 // marked it for unloading). JvmtiDeferredEventQueue support means
1305 // we no longer go to a safepoint here.
1306 post_compiled_method_unload();
1307
1308 #ifdef ASSERT
1309 // It's no longer safe to access the oops section since zombie
1310 // nmethods aren't scanned for GC.
1311 _oops_are_stale = true;
1312 #endif
1313 // the Method may be reclaimed by class unloading now that the
1314 // nmethod is in zombie state
1315 set_method(NULL);
1316 } else {
1317 assert(state == not_entrant, "other cases may need to be handled differently");
1318 }
1319
1320 if (TraceCreateZombies) {
1321 ResourceMark m;
1322 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");
1323 }
1324
1325 NMethodSweeper::report_state_change(this);
1326 return true;
1327 }
1328
1329 void nmethod::flush() {
1330 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1331 // Note that there are no valid oops in the nmethod anymore.
1332 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1333 "osr nmethod must be unloaded or zombie before flushing");
1334 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1335 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1336 assert_locked_or_safepoint(CodeCache_lock);
1337
1338 // completely deallocate this method
1339 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1340 if (PrintMethodFlushing) {
1341 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1342 "/Free CodeCache:" SIZE_FORMAT "Kb",
1343 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1344 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1345 }
1346
1347 // We need to deallocate any ExceptionCache data.
1348 // Note that we do not need to grab the nmethod lock for this, it
1349 // better be thread safe if we're disposing of it!
1350 ExceptionCache* ec = exception_cache();
1351 set_exception_cache(NULL);
1352 while(ec != NULL) {
1353 ExceptionCache* next = ec->next();
1354 delete ec;
1355 ec = next;
1356 }
1357
1358 #if INCLUDE_JVMCI
1359 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1360 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1361 #endif
1362
1363 Universe::heap()->flush_nmethod(this);
1364
1365 CodeBlob::flush();
1366 CodeCache::free(this);
1367 }
1368
1369 oop nmethod::oop_at(int index) const {
1370 if (index == 0) {
1371 return NULL;
1372 }
1373 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1374 }
1375
1376 //
1377 // Notify all classes this nmethod is dependent on that it is no
1378 // longer dependent. This should only be called in two situations.
1379 // First, when a nmethod transitions to a zombie all dependents need
1380 // to be clear. Since zombification happens at a safepoint there's no
1381 // synchronization issues. The second place is a little more tricky.
1382 // During phase 1 of mark sweep class unloading may happen and as a
1383 // result some nmethods may get unloaded. In this case the flushing
1384 // of dependencies must happen during phase 1 since after GC any
1385 // dependencies in the unloaded nmethod won't be updated, so
1386 // traversing the dependency information in unsafe. In that case this
1387 // function is called with a boolean argument and this function only
1388 // notifies instanceKlasses that are reachable
1389
1390 void nmethod::flush_dependencies(bool delete_immediately) {
1391 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1392 assert(called_by_gc != delete_immediately,
1393 "delete_immediately is false if and only if we are called during GC");
1394 if (!has_flushed_dependencies()) {
1395 set_has_flushed_dependencies();
1396 for (Dependencies::DepStream deps(this); deps.next(); ) {
1397 if (deps.type() == Dependencies::call_site_target_value) {
1398 // CallSite dependencies are managed on per-CallSite instance basis.
1399 oop call_site = deps.argument_oop(0);
1400 if (delete_immediately) {
1401 assert_locked_or_safepoint(CodeCache_lock);
1402 MethodHandles::remove_dependent_nmethod(call_site, this);
1403 } else {
1404 MethodHandles::clean_dependency_context(call_site);
1405 }
1406 } else {
1407 Klass* klass = deps.context_type();
1408 if (klass == NULL) {
1409 continue; // ignore things like evol_method
1410 }
1411 // During GC delete_immediately is false, and liveness
1412 // of dependee determines class that needs to be updated.
1413 if (delete_immediately) {
1414 assert_locked_or_safepoint(CodeCache_lock);
1415 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1416 } else if (klass->is_loader_alive()) {
1417 // The GC may clean dependency contexts concurrently and in parallel.
1418 InstanceKlass::cast(klass)->clean_dependency_context();
1419 }
1420 }
1421 }
1422 }
1423 }
1424
1425 // ------------------------------------------------------------------
1426 // post_compiled_method_load_event
1427 // new method for install_code() path
1428 // Transfer information from compilation to jvmti
1429 void nmethod::post_compiled_method_load_event() {
1430
1431 Method* moop = method();
1432 HOTSPOT_COMPILED_METHOD_LOAD(
1433 (char *) moop->klass_name()->bytes(),
1434 moop->klass_name()->utf8_length(),
1435 (char *) moop->name()->bytes(),
1436 moop->name()->utf8_length(),
1437 (char *) moop->signature()->bytes(),
1438 moop->signature()->utf8_length(),
1439 insts_begin(), insts_size());
1440
1441 if (JvmtiExport::should_post_compiled_method_load() ||
1442 JvmtiExport::should_post_compiled_method_unload()) {
1443 get_and_cache_jmethod_id();
1444 }
1445
1446 if (JvmtiExport::should_post_compiled_method_load()) {
1447 // Let the Service thread (which is a real Java thread) post the event
1448 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1449 JvmtiDeferredEventQueue::enqueue(
1450 JvmtiDeferredEvent::compiled_method_load_event(this));
1451 }
1452 }
1453
1454 jmethodID nmethod::get_and_cache_jmethod_id() {
1455 if (_jmethod_id == NULL) {
1456 // Cache the jmethod_id since it can no longer be looked up once the
1457 // method itself has been marked for unloading.
1458 _jmethod_id = method()->jmethod_id();
1459 }
1460 return _jmethod_id;
1461 }
1462
1463 void nmethod::post_compiled_method_unload() {
1464 if (unload_reported()) {
1465 // During unloading we transition to unloaded and then to zombie
1466 // and the unloading is reported during the first transition.
1467 return;
1468 }
1469
1470 assert(_method != NULL && !is_unloaded(), "just checking");
1471 DTRACE_METHOD_UNLOAD_PROBE(method());
1472
1473 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1474 // post the event. Sometime later this nmethod will be made a zombie
1475 // by the sweeper but the Method* will not be valid at that point.
1476 // If the _jmethod_id is null then no load event was ever requested
1477 // so don't bother posting the unload. The main reason for this is
1478 // that the jmethodID is a weak reference to the Method* so if
1479 // it's being unloaded there's no way to look it up since the weak
1480 // ref will have been cleared.
1481 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1482 assert(!unload_reported(), "already unloaded");
1483 JvmtiDeferredEvent event =
1484 JvmtiDeferredEvent::compiled_method_unload_event(this,
1485 _jmethod_id, insts_begin());
1486 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1487 JvmtiDeferredEventQueue::enqueue(event);
1488 }
1489
1490 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1491 // any time. As the nmethod is being unloaded now we mark it has
1492 // having the unload event reported - this will ensure that we don't
1493 // attempt to report the event in the unlikely scenario where the
1494 // event is enabled at the time the nmethod is made a zombie.
1495 set_unload_reported();
1496 }
1497
1498 // Iterate over metadata calling this function. Used by RedefineClasses
1499 void nmethod::metadata_do(MetadataClosure* f) {
1500 {
1501 // Visit all immediate references that are embedded in the instruction stream.
1502 RelocIterator iter(this, oops_reloc_begin());
1503 while (iter.next()) {
1504 if (iter.type() == relocInfo::metadata_type ) {
1505 metadata_Relocation* r = iter.metadata_reloc();
1506 // In this metadata, we must only follow those metadatas directly embedded in
1507 // the code. Other metadatas (oop_index>0) are seen as part of
1508 // the metadata section below.
1509 assert(1 == (r->metadata_is_immediate()) +
1510 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1511 "metadata must be found in exactly one place");
1512 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1513 Metadata* md = r->metadata_value();
1514 if (md != _method) f->do_metadata(md);
1515 }
1516 } else if (iter.type() == relocInfo::virtual_call_type) {
1517 // Check compiledIC holders associated with this nmethod
1518 ResourceMark rm;
1519 CompiledIC *ic = CompiledIC_at(&iter);
1520 if (ic->is_icholder_call()) {
1521 CompiledICHolder* cichk = ic->cached_icholder();
1522 f->do_metadata(cichk->holder_metadata());
1523 f->do_metadata(cichk->holder_klass());
1524 } else {
1525 Metadata* ic_oop = ic->cached_metadata();
1526 if (ic_oop != NULL) {
1527 f->do_metadata(ic_oop);
1528 }
1529 }
1530 }
1531 }
1532 }
1533
1534 // Visit the metadata section
1535 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1536 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1537 Metadata* md = *p;
1538 f->do_metadata(md);
1539 }
1540
1541 // Visit metadata not embedded in the other places.
1542 if (_method != NULL) f->do_metadata(_method);
1543 }
1544
1545 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1546 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1547 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1548 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1549 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1550
1551 class IsUnloadingState: public AllStatic {
1552 static const uint8_t _is_unloading_mask = 1;
1553 static const uint8_t _is_unloading_shift = 0;
1554 static const uint8_t _unloading_cycle_mask = 6;
1555 static const uint8_t _unloading_cycle_shift = 1;
1556
1557 static uint8_t set_is_unloading(uint8_t state, bool value) {
1558 state &= ~_is_unloading_mask;
1559 if (value) {
1560 state |= 1 << _is_unloading_shift;
1561 }
1562 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1563 return state;
1564 }
1565
1566 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1567 state &= ~_unloading_cycle_mask;
1568 state |= value << _unloading_cycle_shift;
1569 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1570 return state;
1571 }
1572
1573 public:
1574 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1575 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1576
1577 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1578 uint8_t state = 0;
1579 state = set_is_unloading(state, is_unloading);
1580 state = set_unloading_cycle(state, unloading_cycle);
1581 return state;
1582 }
1583 };
1584
1585 bool nmethod::is_unloading() {
1586 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1587 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1588 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1589 if (state_is_unloading) {
1590 return true;
1591 }
1592 uint8_t current_cycle = CodeCache::unloading_cycle();
1593 if (state_unloading_cycle == current_cycle) {
1594 return false;
1595 }
1596
1597 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1598 // oops in the CompiledMethod, by calling oops_do on it.
1599 state_unloading_cycle = current_cycle;
1600
1601 if (is_zombie()) {
1602 // Zombies without calculated unloading epoch are never unloading due to GC.
1603
1604 // There are no races where a previously observed is_unloading() nmethod
1605 // suddenly becomes not is_unloading() due to here being observed as zombie.
1606
1607 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1608 // and unloaded in the safepoint. That makes races where an nmethod is first
1609 // observed as is_alive() && is_unloading() and subsequently observed as
1610 // is_zombie() impossible.
1611
1612 // With concurrent unloading, all references to is_unloading() nmethods are
1613 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1614 // handshake operation is performed with all JavaThreads before finally
1615 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1616 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1617 // the global handshake, it is impossible for is_unloading() nmethods to
1618 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1619 // nmethods before taking that global handshake, meaning that it will never
1620 // be recalculated after the handshake.
1621
1622 // After that global handshake, is_unloading() nmethods are only observable
1623 // to the iterators, and they will never trigger recomputation of the cached
1624 // is_unloading_state, and hence may not suffer from such races.
1625
1626 state_is_unloading = false;
1627 } else {
1628 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1629 }
1630
1631 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1632
1633 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1634
1635 return state_is_unloading;
1636 }
1637
1638 void nmethod::clear_unloading_state() {
1639 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1640 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1641 }
1642
1643
1644 // This is called at the end of the strong tracing/marking phase of a
1645 // GC to unload an nmethod if it contains otherwise unreachable
1646 // oops.
1647
1648 void nmethod::do_unloading(bool unloading_occurred) {
1649 // Make sure the oop's ready to receive visitors
1650 assert(!is_zombie() && !is_unloaded(),
1651 "should not call follow on zombie or unloaded nmethod");
1652
1653 if (is_unloading()) {
1654 make_unloaded();
1655 } else {
1656 #if INCLUDE_JVMCI
1657 if (_jvmci_installed_code != NULL) {
1658 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1659 if (_jvmci_installed_code_triggers_invalidation) {
1660 make_not_entrant();
1661 }
1662 clear_jvmci_installed_code();
1663 }
1664 }
1665 #endif
1666
1667 guarantee(unload_nmethod_caches(unloading_occurred),
1668 "Should not need transition stubs");
1669 }
1670 }
1671
1672 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1673 // make sure the oops ready to receive visitors
1674 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1675 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1676
1677 // Prevent extra code cache walk for platforms that don't have immediate oops.
1678 if (relocInfo::mustIterateImmediateOopsInCode()) {
1679 RelocIterator iter(this, oops_reloc_begin());
1680
1681 while (iter.next()) {
1682 if (iter.type() == relocInfo::oop_type ) {
1683 oop_Relocation* r = iter.oop_reloc();
1684 // In this loop, we must only follow those oops directly embedded in
1685 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1686 assert(1 == (r->oop_is_immediate()) +
1687 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1688 "oop must be found in exactly one place");
1689 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1690 f->do_oop(r->oop_addr());
1691 }
1692 }
1693 }
1694 }
1695
1696 // Scopes
1697 // This includes oop constants not inlined in the code stream.
1698 for (oop* p = oops_begin(); p < oops_end(); p++) {
1699 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1700 f->do_oop(p);
1701 }
1702 }
1703
1704 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1705
1706 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1707
1708 // An nmethod is "marked" if its _mark_link is set non-null.
1709 // Even if it is the end of the linked list, it will have a non-null link value,
1710 // as long as it is on the list.
1711 // This code must be MP safe, because it is used from parallel GC passes.
1712 bool nmethod::test_set_oops_do_mark() {
1713 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1714 if (_oops_do_mark_link == NULL) {
1715 // Claim this nmethod for this thread to mark.
1716 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1717 // Atomically append this nmethod (now claimed) to the head of the list:
1718 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1719 for (;;) {
1720 nmethod* required_mark_nmethods = observed_mark_nmethods;
1721 _oops_do_mark_link = required_mark_nmethods;
1722 observed_mark_nmethods =
1723 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1724 if (observed_mark_nmethods == required_mark_nmethods)
1725 break;
1726 }
1727 // Mark was clear when we first saw this guy.
1728 LogTarget(Trace, gc, nmethod) lt;
1729 if (lt.is_enabled()) {
1730 LogStream ls(lt);
1731 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1732 }
1733 return false;
1734 }
1735 }
1736 // On fall through, another racing thread marked this nmethod before we did.
1737 return true;
1738 }
1739
1740 void nmethod::oops_do_marking_prologue() {
1741 log_trace(gc, nmethod)("oops_do_marking_prologue");
1742 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1743 // We use cmpxchg instead of regular assignment here because the user
1744 // may fork a bunch of threads, and we need them all to see the same state.
1745 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1746 guarantee(observed == NULL, "no races in this sequential code");
1747 }
1748
1749 void nmethod::oops_do_marking_epilogue() {
1750 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1751 nmethod* cur = _oops_do_mark_nmethods;
1752 while (cur != NMETHOD_SENTINEL) {
1753 assert(cur != NULL, "not NULL-terminated");
1754 nmethod* next = cur->_oops_do_mark_link;
1755 cur->_oops_do_mark_link = NULL;
1756 DEBUG_ONLY(cur->verify_oop_relocations());
1757
1758 LogTarget(Trace, gc, nmethod) lt;
1759 if (lt.is_enabled()) {
1760 LogStream ls(lt);
1761 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1762 }
1763 cur = next;
1764 }
1765 nmethod* required = _oops_do_mark_nmethods;
1766 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1767 guarantee(observed == required, "no races in this sequential code");
1768 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1769 }
1770
1771 inline bool includes(void* p, void* from, void* to) {
1772 return from <= p && p < to;
1773 }
1774
1775
1776 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1777 assert(count >= 2, "must be sentinel values, at least");
1778
1779 #ifdef ASSERT
1780 // must be sorted and unique; we do a binary search in find_pc_desc()
1781 int prev_offset = pcs[0].pc_offset();
1782 assert(prev_offset == PcDesc::lower_offset_limit,
1783 "must start with a sentinel");
1784 for (int i = 1; i < count; i++) {
1785 int this_offset = pcs[i].pc_offset();
1786 assert(this_offset > prev_offset, "offsets must be sorted");
1787 prev_offset = this_offset;
1788 }
1789 assert(prev_offset == PcDesc::upper_offset_limit,
1790 "must end with a sentinel");
1791 #endif //ASSERT
1792
1793 // Search for MethodHandle invokes and tag the nmethod.
1794 for (int i = 0; i < count; i++) {
1795 if (pcs[i].is_method_handle_invoke()) {
1796 set_has_method_handle_invokes(true);
1797 break;
1798 }
1799 }
1800 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1801
1802 int size = count * sizeof(PcDesc);
1803 assert(scopes_pcs_size() >= size, "oob");
1804 memcpy(scopes_pcs_begin(), pcs, size);
1805
1806 // Adjust the final sentinel downward.
1807 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1808 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1809 last_pc->set_pc_offset(content_size() + 1);
1810 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1811 // Fill any rounding gaps with copies of the last record.
1812 last_pc[1] = last_pc[0];
1813 }
1814 // The following assert could fail if sizeof(PcDesc) is not
1815 // an integral multiple of oopSize (the rounding term).
1816 // If it fails, change the logic to always allocate a multiple
1817 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1818 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1819 }
1820
1821 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1822 assert(scopes_data_size() >= size, "oob");
1823 memcpy(scopes_data_begin(), buffer, size);
1824 }
1825
1826 #ifdef ASSERT
1827 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1828 PcDesc* lower = search.scopes_pcs_begin();
1829 PcDesc* upper = search.scopes_pcs_end();
1830 lower += 1; // exclude initial sentinel
1831 PcDesc* res = NULL;
1832 for (PcDesc* p = lower; p < upper; p++) {
1833 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1834 if (match_desc(p, pc_offset, approximate)) {
1835 if (res == NULL)
1836 res = p;
1837 else
1838 res = (PcDesc*) badAddress;
1839 }
1840 }
1841 return res;
1842 }
1843 #endif
1844
1845
1846 // Finds a PcDesc with real-pc equal to "pc"
1847 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1848 address base_address = search.code_begin();
1849 if ((pc < base_address) ||
1850 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1851 return NULL; // PC is wildly out of range
1852 }
1853 int pc_offset = (int) (pc - base_address);
1854
1855 // Check the PcDesc cache if it contains the desired PcDesc
1856 // (This as an almost 100% hit rate.)
1857 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1858 if (res != NULL) {
1859 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1860 return res;
1861 }
1862
1863 // Fallback algorithm: quasi-linear search for the PcDesc
1864 // Find the last pc_offset less than the given offset.
1865 // The successor must be the required match, if there is a match at all.
1866 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1867 PcDesc* lower = search.scopes_pcs_begin();
1868 PcDesc* upper = search.scopes_pcs_end();
1869 upper -= 1; // exclude final sentinel
1870 if (lower >= upper) return NULL; // native method; no PcDescs at all
1871
1872 #define assert_LU_OK \
1873 /* invariant on lower..upper during the following search: */ \
1874 assert(lower->pc_offset() < pc_offset, "sanity"); \
1875 assert(upper->pc_offset() >= pc_offset, "sanity")
1876 assert_LU_OK;
1877
1878 // Use the last successful return as a split point.
1879 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1880 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1881 if (mid->pc_offset() < pc_offset) {
1882 lower = mid;
1883 } else {
1884 upper = mid;
1885 }
1886
1887 // Take giant steps at first (4096, then 256, then 16, then 1)
1888 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1889 const int RADIX = (1 << LOG2_RADIX);
1890 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1891 while ((mid = lower + step) < upper) {
1892 assert_LU_OK;
1893 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1894 if (mid->pc_offset() < pc_offset) {
1895 lower = mid;
1896 } else {
1897 upper = mid;
1898 break;
1899 }
1900 }
1901 assert_LU_OK;
1902 }
1903
1904 // Sneak up on the value with a linear search of length ~16.
1905 while (true) {
1906 assert_LU_OK;
1907 mid = lower + 1;
1908 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1909 if (mid->pc_offset() < pc_offset) {
1910 lower = mid;
1911 } else {
1912 upper = mid;
1913 break;
1914 }
1915 }
1916 #undef assert_LU_OK
1917
1918 if (match_desc(upper, pc_offset, approximate)) {
1919 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1920 _pc_desc_cache.add_pc_desc(upper);
1921 return upper;
1922 } else {
1923 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1924 return NULL;
1925 }
1926 }
1927
1928
1929 void nmethod::check_all_dependencies(DepChange& changes) {
1930 // Checked dependencies are allocated into this ResourceMark
1931 ResourceMark rm;
1932
1933 // Turn off dependency tracing while actually testing dependencies.
1934 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1935
1936 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1937 &DependencySignature::equals, 11027> DepTable;
1938
1939 DepTable* table = new DepTable();
1940
1941 // Iterate over live nmethods and check dependencies of all nmethods that are not
1942 // marked for deoptimization. A particular dependency is only checked once.
1943 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1944 while(iter.next()) {
1945 nmethod* nm = iter.method();
1946 // Only notify for live nmethods
1947 if (!nm->is_marked_for_deoptimization()) {
1948 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1949 // Construct abstraction of a dependency.
1950 DependencySignature* current_sig = new DependencySignature(deps);
1951
1952 // Determine if dependency is already checked. table->put(...) returns
1953 // 'true' if the dependency is added (i.e., was not in the hashtable).
1954 if (table->put(*current_sig, 1)) {
1955 if (deps.check_dependency() != NULL) {
1956 // Dependency checking failed. Print out information about the failed
1957 // dependency and finally fail with an assert. We can fail here, since
1958 // dependency checking is never done in a product build.
1959 tty->print_cr("Failed dependency:");
1960 changes.print();
1961 nm->print();
1962 nm->print_dependencies();
1963 assert(false, "Should have been marked for deoptimization");
1964 }
1965 }
1966 }
1967 }
1968 }
1969 }
1970
1971 bool nmethod::check_dependency_on(DepChange& changes) {
1972 // What has happened:
1973 // 1) a new class dependee has been added
1974 // 2) dependee and all its super classes have been marked
1975 bool found_check = false; // set true if we are upset
1976 for (Dependencies::DepStream deps(this); deps.next(); ) {
1977 // Evaluate only relevant dependencies.
1978 if (deps.spot_check_dependency_at(changes) != NULL) {
1979 found_check = true;
1980 NOT_DEBUG(break);
1981 }
1982 }
1983 return found_check;
1984 }
1985
1986 // Called from mark_for_deoptimization, when dependee is invalidated.
1987 bool nmethod::is_dependent_on_method(Method* dependee) {
1988 for (Dependencies::DepStream deps(this); deps.next(); ) {
1989 if (deps.type() != Dependencies::evol_method)
1990 continue;
1991 Method* method = deps.method_argument(0);
1992 if (method == dependee) return true;
1993 }
1994 return false;
1995 }
1996
1997
1998 bool nmethod::is_patchable_at(address instr_addr) {
1999 assert(insts_contains(instr_addr), "wrong nmethod used");
2000 if (is_zombie()) {
2001 // a zombie may never be patched
2002 return false;
2003 }
2004 return true;
2005 }
2006
2007
2008 address nmethod::continuation_for_implicit_exception(address pc) {
2009 // Exception happened outside inline-cache check code => we are inside
2010 // an active nmethod => use cpc to determine a return address
2011 int exception_offset = pc - code_begin();
2012 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2013 #ifdef ASSERT
2014 if (cont_offset == 0) {
2015 Thread* thread = Thread::current();
2016 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2017 HandleMark hm(thread);
2018 ResourceMark rm(thread);
2019 CodeBlob* cb = CodeCache::find_blob(pc);
2020 assert(cb != NULL && cb == this, "");
2021 ttyLocker ttyl;
2022 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2023 print();
2024 method()->print_codes();
2025 print_code();
2026 print_pcs();
2027 }
2028 #endif
2029 if (cont_offset == 0) {
2030 // Let the normal error handling report the exception
2031 return NULL;
2032 }
2033 return code_begin() + cont_offset;
2034 }
2035
2036
2037
2038 void nmethod_init() {
2039 // make sure you didn't forget to adjust the filler fields
2040 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2041 }
2042
2043
2044 //-------------------------------------------------------------------------------------------
2045
2046
2047 // QQQ might we make this work from a frame??
2048 nmethodLocker::nmethodLocker(address pc) {
2049 CodeBlob* cb = CodeCache::find_blob(pc);
2050 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2051 _nm = cb->as_compiled_method();
2052 lock_nmethod(_nm);
2053 }
2054
2055 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2056 // should pass zombie_ok == true.
2057 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2058 if (cm == NULL) return;
2059 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2060 nmethod* nm = cm->as_nmethod();
2061 Atomic::inc(&nm->_lock_count);
2062 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2063 }
2064
2065 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2066 if (cm == NULL) return;
2067 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2068 nmethod* nm = cm->as_nmethod();
2069 Atomic::dec(&nm->_lock_count);
2070 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2071 }
2072
2073
2074 // -----------------------------------------------------------------------------
2075 // Verification
2076
2077 class VerifyOopsClosure: public OopClosure {
2078 nmethod* _nm;
2079 bool _ok;
2080 public:
2081 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2082 bool ok() { return _ok; }
2083 virtual void do_oop(oop* p) {
2084 if (oopDesc::is_oop_or_null(*p)) return;
2085 if (_ok) {
2086 _nm->print_nmethod(true);
2087 _ok = false;
2088 }
2089 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2090 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2091 }
2092 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2093 };
2094
2095 void nmethod::verify() {
2096
2097 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2098 // seems odd.
2099
2100 if (is_zombie() || is_not_entrant() || is_unloaded())
2101 return;
2102
2103 // Make sure all the entry points are correctly aligned for patching.
2104 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2105
2106 // assert(oopDesc::is_oop(method()), "must be valid");
2107
2108 ResourceMark rm;
2109
2110 if (!CodeCache::contains(this)) {
2111 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2112 }
2113
2114 if(is_native_method() )
2115 return;
2116
2117 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2118 if (nm != this) {
2119 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2120 }
2121
2122 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2123 if (! p->verify(this)) {
2124 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2125 }
2126 }
2127
2128 VerifyOopsClosure voc(this);
2129 oops_do(&voc);
2130 assert(voc.ok(), "embedded oops must be OK");
2131 Universe::heap()->verify_nmethod(this);
2132
2133 verify_scopes();
2134 }
2135
2136
2137 void nmethod::verify_interrupt_point(address call_site) {
2138 // Verify IC only when nmethod installation is finished.
2139 if (!is_not_installed()) {
2140 if (CompiledICLocker::is_safe(this)) {
2141 CompiledIC_at(this, call_site);
2142 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2143 } else {
2144 CompiledICLocker ml_verify(this);
2145 CompiledIC_at(this, call_site);
2146 }
2147 }
2148
2149 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2150 assert(pd != NULL, "PcDesc must exist");
2151 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2152 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2153 pd->return_oop());
2154 !sd->is_top(); sd = sd->sender()) {
2155 sd->verify();
2156 }
2157 }
2158
2159 void nmethod::verify_scopes() {
2160 if( !method() ) return; // Runtime stubs have no scope
2161 if (method()->is_native()) return; // Ignore stub methods.
2162 // iterate through all interrupt point
2163 // and verify the debug information is valid.
2164 RelocIterator iter((nmethod*)this);
2165 while (iter.next()) {
2166 address stub = NULL;
2167 switch (iter.type()) {
2168 case relocInfo::virtual_call_type:
2169 verify_interrupt_point(iter.addr());
2170 break;
2171 case relocInfo::opt_virtual_call_type:
2172 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2173 verify_interrupt_point(iter.addr());
2174 break;
2175 case relocInfo::static_call_type:
2176 stub = iter.static_call_reloc()->static_stub(false);
2177 //verify_interrupt_point(iter.addr());
2178 break;
2179 case relocInfo::runtime_call_type:
2180 case relocInfo::runtime_call_w_cp_type: {
2181 address destination = iter.reloc()->value();
2182 // Right now there is no way to find out which entries support
2183 // an interrupt point. It would be nice if we had this
2184 // information in a table.
2185 break;
2186 }
2187 default:
2188 break;
2189 }
2190 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2191 }
2192 }
2193
2194
2195 // -----------------------------------------------------------------------------
2196 // Printing operations
2197
2198 void nmethod::print() const {
2199 ResourceMark rm;
2200 ttyLocker ttyl; // keep the following output all in one block
2201
2202 tty->print("Compiled method ");
2203
2204 if (is_compiled_by_c1()) {
2205 tty->print("(c1) ");
2206 } else if (is_compiled_by_c2()) {
2207 tty->print("(c2) ");
2208 } else if (is_compiled_by_jvmci()) {
2209 tty->print("(JVMCI) ");
2210 } else {
2211 tty->print("(nm) ");
2212 }
2213
2214 print_on(tty, NULL);
2215
2216 if (WizardMode) {
2217 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2218 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2219 tty->print(" { ");
2220 tty->print_cr("%s ", state());
2221 tty->print_cr("}:");
2222 }
2223 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2224 p2i(this),
2225 p2i(this) + size(),
2226 size());
2227 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2228 p2i(relocation_begin()),
2229 p2i(relocation_end()),
2230 relocation_size());
2231 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2232 p2i(consts_begin()),
2233 p2i(consts_end()),
2234 consts_size());
2235 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2236 p2i(insts_begin()),
2237 p2i(insts_end()),
2238 insts_size());
2239 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2240 p2i(stub_begin()),
2241 p2i(stub_end()),
2242 stub_size());
2243 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2244 p2i(oops_begin()),
2245 p2i(oops_end()),
2246 oops_size());
2247 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2248 p2i(metadata_begin()),
2249 p2i(metadata_end()),
2250 metadata_size());
2251 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2252 p2i(scopes_data_begin()),
2253 p2i(scopes_data_end()),
2254 scopes_data_size());
2255 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2256 p2i(scopes_pcs_begin()),
2257 p2i(scopes_pcs_end()),
2258 scopes_pcs_size());
2259 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2260 p2i(dependencies_begin()),
2261 p2i(dependencies_end()),
2262 dependencies_size());
2263 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2264 p2i(handler_table_begin()),
2265 p2i(handler_table_end()),
2266 handler_table_size());
2267 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2268 p2i(nul_chk_table_begin()),
2269 p2i(nul_chk_table_end()),
2270 nul_chk_table_size());
2271 }
2272
2273 #ifndef PRODUCT
2274
2275 void nmethod::print_scopes() {
2276 // Find the first pc desc for all scopes in the code and print it.
2277 ResourceMark rm;
2278 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2279 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2280 continue;
2281
2282 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2283 while (sd != NULL) {
2284 sd->print_on(tty, p);
2285 sd = sd->sender();
2286 }
2287 }
2288 }
2289
2290 void nmethod::print_dependencies() {
2291 ResourceMark rm;
2292 ttyLocker ttyl; // keep the following output all in one block
2293 tty->print_cr("Dependencies:");
2294 for (Dependencies::DepStream deps(this); deps.next(); ) {
2295 deps.print_dependency();
2296 Klass* ctxk = deps.context_type();
2297 if (ctxk != NULL) {
2298 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2299 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2300 }
2301 }
2302 deps.log_dependency(); // put it into the xml log also
2303 }
2304 }
2305
2306
2307 void nmethod::print_relocations() {
2308 ResourceMark m; // in case methods get printed via the debugger
2309 tty->print_cr("relocations:");
2310 RelocIterator iter(this);
2311 iter.print();
2312 }
2313
2314
2315 void nmethod::print_pcs() {
2316 ResourceMark m; // in case methods get printed via debugger
2317 tty->print_cr("pc-bytecode offsets:");
2318 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2319 p->print(this);
2320 }
2321 }
2322
2323 void nmethod::print_recorded_oops() {
2324 tty->print_cr("Recorded oops:");
2325 for (int i = 0; i < oops_count(); i++) {
2326 oop o = oop_at(i);
2327 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2328 if (o == Universe::non_oop_word()) {
2329 tty->print("non-oop word");
2330 } else {
2331 if (o != NULL) {
2332 o->print_value();
2333 } else {
2334 tty->print_cr("NULL");
2335 }
2336 }
2337 tty->cr();
2338 }
2339 }
2340
2341 void nmethod::print_recorded_metadata() {
2342 tty->print_cr("Recorded metadata:");
2343 for (int i = 0; i < metadata_count(); i++) {
2344 Metadata* m = metadata_at(i);
2345 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2346 if (m == (Metadata*)Universe::non_oop_word()) {
2347 tty->print("non-metadata word");
2348 } else {
2349 Metadata::print_value_on_maybe_null(tty, m);
2350 }
2351 tty->cr();
2352 }
2353 }
2354
2355 #endif // PRODUCT
2356
2357 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2358 RelocIterator iter(this, begin, end);
2359 bool have_one = false;
2360 while (iter.next()) {
2361 have_one = true;
2362 switch (iter.type()) {
2363 case relocInfo::none: return "no_reloc";
2364 case relocInfo::oop_type: {
2365 stringStream st;
2366 oop_Relocation* r = iter.oop_reloc();
2367 oop obj = r->oop_value();
2368 st.print("oop(");
2369 if (obj == NULL) st.print("NULL");
2370 else obj->print_value_on(&st);
2371 st.print(")");
2372 return st.as_string();
2373 }
2374 case relocInfo::metadata_type: {
2375 stringStream st;
2376 metadata_Relocation* r = iter.metadata_reloc();
2377 Metadata* obj = r->metadata_value();
2378 st.print("metadata(");
2379 if (obj == NULL) st.print("NULL");
2380 else obj->print_value_on(&st);
2381 st.print(")");
2382 return st.as_string();
2383 }
2384 case relocInfo::runtime_call_type:
2385 case relocInfo::runtime_call_w_cp_type: {
2386 stringStream st;
2387 st.print("runtime_call");
2388 CallRelocation* r = (CallRelocation*)iter.reloc();
2389 address dest = r->destination();
2390 CodeBlob* cb = CodeCache::find_blob(dest);
2391 if (cb != NULL) {
2392 st.print(" %s", cb->name());
2393 } else {
2394 ResourceMark rm;
2395 const int buflen = 1024;
2396 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2397 int offset;
2398 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2399 st.print(" %s", buf);
2400 if (offset != 0) {
2401 st.print("+%d", offset);
2402 }
2403 }
2404 }
2405 return st.as_string();
2406 }
2407 case relocInfo::virtual_call_type: {
2408 stringStream st;
2409 st.print_raw("virtual_call");
2410 virtual_call_Relocation* r = iter.virtual_call_reloc();
2411 Method* m = r->method_value();
2412 if (m != NULL) {
2413 assert(m->is_method(), "");
2414 m->print_short_name(&st);
2415 }
2416 return st.as_string();
2417 }
2418 case relocInfo::opt_virtual_call_type: {
2419 stringStream st;
2420 st.print_raw("optimized virtual_call");
2421 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2422 Method* m = r->method_value();
2423 if (m != NULL) {
2424 assert(m->is_method(), "");
2425 m->print_short_name(&st);
2426 }
2427 return st.as_string();
2428 }
2429 case relocInfo::static_call_type: {
2430 stringStream st;
2431 st.print_raw("static_call");
2432 static_call_Relocation* r = iter.static_call_reloc();
2433 Method* m = r->method_value();
2434 if (m != NULL) {
2435 assert(m->is_method(), "");
2436 m->print_short_name(&st);
2437 }
2438 return st.as_string();
2439 }
2440 case relocInfo::static_stub_type: return "static_stub";
2441 case relocInfo::external_word_type: return "external_word";
2442 case relocInfo::internal_word_type: return "internal_word";
2443 case relocInfo::section_word_type: return "section_word";
2444 case relocInfo::poll_type: return "poll";
2445 case relocInfo::poll_return_type: return "poll_return";
2446 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2447 case relocInfo::type_mask: return "type_bit_mask";
2448
2449 default:
2450 break;
2451 }
2452 }
2453 return have_one ? "other" : NULL;
2454 }
2455
2456 // Return a the last scope in (begin..end]
2457 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2458 PcDesc* p = pc_desc_near(begin+1);
2459 if (p != NULL && p->real_pc(this) <= end) {
2460 return new ScopeDesc(this, p->scope_decode_offset(),
2461 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2462 p->return_oop());
2463 }
2464 return NULL;
2465 }
2466
2467 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2468 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2469 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2470 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2471 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2472 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2473
2474 if (has_method_handle_invokes())
2475 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2476
2477 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2478
2479 if (block_begin == entry_point()) {
2480 methodHandle m = method();
2481 if (m.not_null()) {
2482 stream->print(" # ");
2483 m->print_value_on(stream);
2484 stream->cr();
2485 }
2486 if (m.not_null() && !is_osr_method()) {
2487 ResourceMark rm;
2488 int sizeargs = m->size_of_parameters();
2489 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2490 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2491 {
2492 int sig_index = 0;
2493 if (!m->is_static())
2494 sig_bt[sig_index++] = T_OBJECT; // 'this'
2495 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2496 BasicType t = ss.type();
2497 sig_bt[sig_index++] = t;
2498 if (type2size[t] == 2) {
2499 sig_bt[sig_index++] = T_VOID;
2500 } else {
2501 assert(type2size[t] == 1, "size is 1 or 2");
2502 }
2503 }
2504 assert(sig_index == sizeargs, "");
2505 }
2506 const char* spname = "sp"; // make arch-specific?
2507 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2508 int stack_slot_offset = this->frame_size() * wordSize;
2509 int tab1 = 14, tab2 = 24;
2510 int sig_index = 0;
2511 int arg_index = (m->is_static() ? 0 : -1);
2512 bool did_old_sp = false;
2513 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2514 bool at_this = (arg_index == -1);
2515 bool at_old_sp = false;
2516 BasicType t = (at_this ? T_OBJECT : ss.type());
2517 assert(t == sig_bt[sig_index], "sigs in sync");
2518 if (at_this)
2519 stream->print(" # this: ");
2520 else
2521 stream->print(" # parm%d: ", arg_index);
2522 stream->move_to(tab1);
2523 VMReg fst = regs[sig_index].first();
2524 VMReg snd = regs[sig_index].second();
2525 if (fst->is_reg()) {
2526 stream->print("%s", fst->name());
2527 if (snd->is_valid()) {
2528 stream->print(":%s", snd->name());
2529 }
2530 } else if (fst->is_stack()) {
2531 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2532 if (offset == stack_slot_offset) at_old_sp = true;
2533 stream->print("[%s+0x%x]", spname, offset);
2534 } else {
2535 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2536 }
2537 stream->print(" ");
2538 stream->move_to(tab2);
2539 stream->print("= ");
2540 if (at_this) {
2541 m->method_holder()->print_value_on(stream);
2542 } else {
2543 bool did_name = false;
2544 if (!at_this && ss.is_object()) {
2545 Symbol* name = ss.as_symbol_or_null();
2546 if (name != NULL) {
2547 name->print_value_on(stream);
2548 did_name = true;
2549 }
2550 }
2551 if (!did_name)
2552 stream->print("%s", type2name(t));
2553 }
2554 if (at_old_sp) {
2555 stream->print(" (%s of caller)", spname);
2556 did_old_sp = true;
2557 }
2558 stream->cr();
2559 sig_index += type2size[t];
2560 arg_index += 1;
2561 if (!at_this) ss.next();
2562 }
2563 if (!did_old_sp) {
2564 stream->print(" # ");
2565 stream->move_to(tab1);
2566 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2567 stream->print(" (%s of caller)", spname);
2568 stream->cr();
2569 }
2570 }
2571 }
2572 }
2573
2574 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2575 // First, find an oopmap in (begin, end].
2576 // We use the odd half-closed interval so that oop maps and scope descs
2577 // which are tied to the byte after a call are printed with the call itself.
2578 address base = code_begin();
2579 ImmutableOopMapSet* oms = oop_maps();
2580 if (oms != NULL) {
2581 for (int i = 0, imax = oms->count(); i < imax; i++) {
2582 const ImmutableOopMapPair* pair = oms->pair_at(i);
2583 const ImmutableOopMap* om = pair->get_from(oms);
2584 address pc = base + pair->pc_offset();
2585 if (pc > begin) {
2586 if (pc <= end) {
2587 st->move_to(column);
2588 st->print("; ");
2589 om->print_on(st);
2590 }
2591 break;
2592 }
2593 }
2594 }
2595
2596 // Print any debug info present at this pc.
2597 ScopeDesc* sd = scope_desc_in(begin, end);
2598 if (sd != NULL) {
2599 st->move_to(column);
2600 if (sd->bci() == SynchronizationEntryBCI) {
2601 st->print(";*synchronization entry");
2602 } else if (sd->bci() == AfterBci) {
2603 st->print(";* method exit (unlocked if synchronized)");
2604 } else if (sd->bci() == UnwindBci) {
2605 st->print(";* unwind (locked if synchronized)");
2606 } else if (sd->bci() == AfterExceptionBci) {
2607 st->print(";* unwind (unlocked if synchronized)");
2608 } else if (sd->bci() == UnknownBci) {
2609 st->print(";* unknown");
2610 } else if (sd->bci() == InvalidFrameStateBci) {
2611 st->print(";* invalid frame state");
2612 } else {
2613 if (sd->method() == NULL) {
2614 st->print("method is NULL");
2615 } else if (sd->method()->is_native()) {
2616 st->print("method is native");
2617 } else {
2618 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2619 st->print(";*%s", Bytecodes::name(bc));
2620 switch (bc) {
2621 case Bytecodes::_invokevirtual:
2622 case Bytecodes::_invokespecial:
2623 case Bytecodes::_invokestatic:
2624 case Bytecodes::_invokeinterface:
2625 {
2626 Bytecode_invoke invoke(sd->method(), sd->bci());
2627 st->print(" ");
2628 if (invoke.name() != NULL)
2629 invoke.name()->print_symbol_on(st);
2630 else
2631 st->print("<UNKNOWN>");
2632 break;
2633 }
2634 case Bytecodes::_getfield:
2635 case Bytecodes::_putfield:
2636 case Bytecodes::_getstatic:
2637 case Bytecodes::_putstatic:
2638 {
2639 Bytecode_field field(sd->method(), sd->bci());
2640 st->print(" ");
2641 if (field.name() != NULL)
2642 field.name()->print_symbol_on(st);
2643 else
2644 st->print("<UNKNOWN>");
2645 }
2646 default:
2647 break;
2648 }
2649 }
2650 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2651 }
2652
2653 // Print all scopes
2654 for (;sd != NULL; sd = sd->sender()) {
2655 st->move_to(column);
2656 st->print("; -");
2657 if (sd->method() == NULL) {
2658 st->print("method is NULL");
2659 } else {
2660 sd->method()->print_short_name(st);
2661 }
2662 int lineno = sd->method()->line_number_from_bci(sd->bci());
2663 if (lineno != -1) {
2664 st->print("@%d (line %d)", sd->bci(), lineno);
2665 } else {
2666 st->print("@%d", sd->bci());
2667 }
2668 st->cr();
2669 }
2670 }
2671
2672 // Print relocation information
2673 const char* str = reloc_string_for(begin, end);
2674 if (str != NULL) {
2675 if (sd != NULL) st->cr();
2676 st->move_to(column);
2677 st->print("; {%s}", str);
2678 }
2679 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2680 if (cont_offset != 0) {
2681 st->move_to(column);
2682 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2683 }
2684
2685 }
2686
2687 class DirectNativeCallWrapper: public NativeCallWrapper {
2688 private:
2689 NativeCall* _call;
2690
2691 public:
2692 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2693
2694 virtual address destination() const { return _call->destination(); }
2695 virtual address instruction_address() const { return _call->instruction_address(); }
2696 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2697 virtual address return_address() const { return _call->return_address(); }
2698
2699 virtual address get_resolve_call_stub(bool is_optimized) const {
2700 if (is_optimized) {
2701 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2702 }
2703 return SharedRuntime::get_resolve_virtual_call_stub();
2704 }
2705
2706 virtual void set_destination_mt_safe(address dest) {
2707 #if INCLUDE_AOT
2708 if (UseAOT) {
2709 CodeBlob* callee = CodeCache::find_blob(dest);
2710 CompiledMethod* cm = callee->as_compiled_method_or_null();
2711 if (cm != NULL && cm->is_far_code()) {
2712 // Temporary fix, see JDK-8143106
2713 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2714 csc->set_to_far(methodHandle(cm->method()), dest);
2715 return;
2716 }
2717 }
2718 #endif
2719 _call->set_destination_mt_safe(dest);
2720 }
2721
2722 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2723 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2724 #if INCLUDE_AOT
2725 if (info.to_aot()) {
2726 csc->set_to_far(method, info.entry());
2727 } else
2728 #endif
2729 {
2730 csc->set_to_interpreted(method, info.entry());
2731 }
2732 }
2733
2734 virtual void verify() const {
2735 // make sure code pattern is actually a call imm32 instruction
2736 _call->verify();
2737 _call->verify_alignment();
2738 }
2739
2740 virtual void verify_resolve_call(address dest) const {
2741 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2742 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2743 }
2744
2745 virtual bool is_call_to_interpreted(address dest) const {
2746 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2747 return cb->contains(dest);
2748 }
2749
2750 virtual bool is_safe_for_patching() const { return false; }
2751
2752 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2753 return nativeMovConstReg_at(r->cached_value());
2754 }
2755
2756 virtual void *get_data(NativeInstruction* instruction) const {
2757 return (void*)((NativeMovConstReg*) instruction)->data();
2758 }
2759
2760 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2761 ((NativeMovConstReg*) instruction)->set_data(data);
2762 }
2763 };
2764
2765 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2766 return new DirectNativeCallWrapper((NativeCall*) call);
2767 }
2768
2769 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2770 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2771 }
2772
2773 address nmethod::call_instruction_address(address pc) const {
2774 if (NativeCall::is_call_before(pc)) {
2775 NativeCall *ncall = nativeCall_before(pc);
2776 return ncall->instruction_address();
2777 }
2778 return NULL;
2779 }
2780
2781 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2782 return CompiledDirectStaticCall::at(call_site);
2783 }
2784
2785 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2786 return CompiledDirectStaticCall::at(call_site);
2787 }
2788
2789 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2790 return CompiledDirectStaticCall::before(return_addr);
2791 }
2792
2793 #ifndef PRODUCT
2794
2795 void nmethod::print_value_on(outputStream* st) const {
2796 st->print("nmethod");
2797 print_on(st, NULL);
2798 }
2799
2800 void nmethod::print_calls(outputStream* st) {
2801 RelocIterator iter(this);
2802 while (iter.next()) {
2803 switch (iter.type()) {
2804 case relocInfo::virtual_call_type:
2805 case relocInfo::opt_virtual_call_type: {
2806 CompiledICLocker ml_verify(this);
2807 CompiledIC_at(&iter)->print();
2808 break;
2809 }
2810 case relocInfo::static_call_type:
2811 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2812 CompiledDirectStaticCall::at(iter.reloc())->print();
2813 break;
2814 default:
2815 break;
2816 }
2817 }
2818 }
2819
2820 void nmethod::print_handler_table() {
2821 ExceptionHandlerTable(this).print();
2822 }
2823
2824 void nmethod::print_nul_chk_table() {
2825 ImplicitExceptionTable(this).print(code_begin());
2826 }
2827
2828 void nmethod::print_statistics() {
2829 ttyLocker ttyl;
2830 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2831 native_nmethod_stats.print_native_nmethod_stats();
2832 #ifdef COMPILER1
2833 c1_java_nmethod_stats.print_nmethod_stats("C1");
2834 #endif
2835 #ifdef COMPILER2
2836 c2_java_nmethod_stats.print_nmethod_stats("C2");
2837 #endif
2838 #if INCLUDE_JVMCI
2839 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2840 #endif
2841 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2842 DebugInformationRecorder::print_statistics();
2843 #ifndef PRODUCT
2844 pc_nmethod_stats.print_pc_stats();
2845 #endif
2846 Dependencies::print_statistics();
2847 if (xtty != NULL) xtty->tail("statistics");
2848 }
2849
2850 #endif // !PRODUCT
2851
2852 #if INCLUDE_JVMCI
2853 void nmethod::clear_jvmci_installed_code() {
2854 assert_locked_or_safepoint(CompiledMethod_lock);
2855 if (_jvmci_installed_code != NULL) {
2856 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2857 _jvmci_installed_code = NULL;
2858 }
2859 }
2860
2861 void nmethod::clear_speculation_log() {
2862 assert_locked_or_safepoint(CompiledMethod_lock);
2863 if (_speculation_log != NULL) {
2864 JNIHandles::destroy_weak_global(_speculation_log);
2865 _speculation_log = NULL;
2866 }
2867 }
2868
2869 void nmethod::maybe_invalidate_installed_code() {
2870 if (!is_compiled_by_jvmci()) {
2871 return;
2872 }
2873
2874 assert(CompiledMethod_lock->is_locked() ||
2875 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2876 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2877 if (installed_code != NULL) {
2878 // Update the values in the InstalledCode instance if it still refers to this nmethod
2879 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2880 if (nm == this) {
2881 if (!is_alive() || is_unloading()) {
2882 // Break the link between nmethod and InstalledCode such that the nmethod
2883 // can subsequently be flushed safely. The link must be maintained while
2884 // the method could have live activations since invalidateInstalledCode
2885 // might want to invalidate all existing activations.
2886 InstalledCode::set_address(installed_code, 0);
2887 InstalledCode::set_entryPoint(installed_code, 0);
2888 } else if (is_not_entrant()) {
2889 // Remove the entry point so any invocation will fail but keep
2890 // the address link around that so that existing activations can
2891 // be invalidated.
2892 InstalledCode::set_entryPoint(installed_code, 0);
2893 }
2894 }
2895 }
2896 if (!is_alive() || is_unloading()) {
2897 // Clear these out after the nmethod has been unregistered and any
2898 // updates to the InstalledCode instance have been performed.
2899 clear_jvmci_installed_code();
2900 clear_speculation_log();
2901 }
2902 }
2903
2904 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2905 if (installedCode() == NULL) {
2906 THROW(vmSymbols::java_lang_NullPointerException());
2907 }
2908 jlong nativeMethod = InstalledCode::address(installedCode);
2909 nmethod* nm = (nmethod*)nativeMethod;
2910 if (nm == NULL) {
2911 // Nothing to do
2912 return;
2913 }
2914
2915 nmethodLocker nml(nm);
2916 #ifdef ASSERT
2917 {
2918 MutexLockerEx pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
2919 // This relationship can only be checked safely under a lock
2920 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2921 }
2922 #endif
2923
2924 if (nm->is_alive()) {
2925 // Invalidating the InstalledCode means we want the nmethod
2926 // to be deoptimized.
2927 nm->mark_for_deoptimization();
2928 Deoptimization::deoptimize_all_marked();
2929 }
2930
2931 // Multiple threads could reach this point so we now need to
2932 // lock and re-check the link to the nmethod so that only one
2933 // thread clears it.
2934 MutexLockerEx pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
2935 if (InstalledCode::address(installedCode) == nativeMethod) {
2936 InstalledCode::set_address(installedCode, 0);
2937 }
2938 }
2939
2940 oop nmethod::jvmci_installed_code() {
2941 return JNIHandles::resolve(_jvmci_installed_code);
2942 }
2943
2944 oop nmethod::speculation_log() {
2945 return JNIHandles::resolve(_speculation_log);
2946 }
2947
2948 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
2949 if (!this->is_compiled_by_jvmci()) {
2950 return NULL;
2951 }
2952 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2953 if (installed_code != NULL) {
2954 oop installed_code_name = NULL;
2955 if (installed_code->is_a(InstalledCode::klass())) {
2956 installed_code_name = InstalledCode::name(installed_code);
2957 }
2958 if (installed_code_name != NULL) {
2959 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2960 }
2961 }
2962 return NULL;
2963 }
2964 #endif