1 /*
2 * Copyright (c) 1997, 2018, 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/method.inline.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "prims/jvmtiImpl.hpp"
49 #include "runtime/atomic.hpp"
50 #include "runtime/flags/flagSetting.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/jniHandles.inline.hpp"
54 #include "runtime/orderAccess.hpp"
55 #include "runtime/os.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/sweeper.hpp"
59 #include "runtime/vmThread.hpp"
60 #include "utilities/align.hpp"
61 #include "utilities/dtrace.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/resourceHash.hpp"
64 #include "utilities/xmlstream.hpp"
65 #if INCLUDE_JVMCI
66 #include "jvmci/jvmciJavaClasses.hpp"
67 #endif
68
69 #ifdef DTRACE_ENABLED
70
71 // Only bother with this argument setup if dtrace is available
72
73 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
74 { \
75 Method* m = (method); \
76 if (m != NULL) { \
77 Symbol* klass_name = m->klass_name(); \
78 Symbol* name = m->name(); \
79 Symbol* signature = m->signature(); \
80 HOTSPOT_COMPILED_METHOD_UNLOAD( \
81 (char *) klass_name->bytes(), klass_name->utf8_length(), \
82 (char *) name->bytes(), name->utf8_length(), \
83 (char *) signature->bytes(), signature->utf8_length()); \
84 } \
85 }
86
87 #else // ndef DTRACE_ENABLED
88
89 #define DTRACE_METHOD_UNLOAD_PROBE(method)
90
91 #endif
92
93 //---------------------------------------------------------------------------------
94 // NMethod statistics
95 // They are printed under various flags, including:
96 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
97 // (In the latter two cases, they like other stats are printed to the log only.)
98
99 #ifndef PRODUCT
100 // These variables are put into one block to reduce relocations
101 // and make it simpler to print from the debugger.
102 struct java_nmethod_stats_struct {
103 int nmethod_count;
104 int total_size;
105 int relocation_size;
106 int consts_size;
107 int insts_size;
108 int stub_size;
109 int scopes_data_size;
110 int scopes_pcs_size;
111 int dependencies_size;
112 int handler_table_size;
113 int nul_chk_table_size;
114 int oops_size;
115 int metadata_size;
116
117 void note_nmethod(nmethod* nm) {
118 nmethod_count += 1;
119 total_size += nm->size();
120 relocation_size += nm->relocation_size();
121 consts_size += nm->consts_size();
122 insts_size += nm->insts_size();
123 stub_size += nm->stub_size();
124 oops_size += nm->oops_size();
125 metadata_size += nm->metadata_size();
126 scopes_data_size += nm->scopes_data_size();
127 scopes_pcs_size += nm->scopes_pcs_size();
128 dependencies_size += nm->dependencies_size();
129 handler_table_size += nm->handler_table_size();
130 nul_chk_table_size += nm->nul_chk_table_size();
131 }
132 void print_nmethod_stats(const char* name) {
133 if (nmethod_count == 0) return;
134 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
135 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
136 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
137 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
138 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
139 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
140 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
141 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
142 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
143 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
144 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
145 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
146 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
147 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
148 }
149 };
150
151 struct native_nmethod_stats_struct {
152 int native_nmethod_count;
153 int native_total_size;
154 int native_relocation_size;
155 int native_insts_size;
156 int native_oops_size;
157 int native_metadata_size;
158 void note_native_nmethod(nmethod* nm) {
159 native_nmethod_count += 1;
160 native_total_size += nm->size();
161 native_relocation_size += nm->relocation_size();
162 native_insts_size += nm->insts_size();
163 native_oops_size += nm->oops_size();
164 native_metadata_size += nm->metadata_size();
165 }
166 void print_native_nmethod_stats() {
167 if (native_nmethod_count == 0) return;
168 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
169 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
170 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
171 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
172 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
173 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
174 }
175 };
176
177 struct pc_nmethod_stats_struct {
178 int pc_desc_resets; // number of resets (= number of caches)
179 int pc_desc_queries; // queries to nmethod::find_pc_desc
180 int pc_desc_approx; // number of those which have approximate true
181 int pc_desc_repeats; // number of _pc_descs[0] hits
182 int pc_desc_hits; // number of LRU cache hits
183 int pc_desc_tests; // total number of PcDesc examinations
184 int pc_desc_searches; // total number of quasi-binary search steps
185 int pc_desc_adds; // number of LUR cache insertions
186
187 void print_pc_stats() {
188 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
189 pc_desc_queries,
190 (double)(pc_desc_tests + pc_desc_searches)
191 / pc_desc_queries);
192 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
193 pc_desc_resets,
194 pc_desc_queries, pc_desc_approx,
195 pc_desc_repeats, pc_desc_hits,
196 pc_desc_tests, pc_desc_searches, pc_desc_adds);
197 }
198 };
199
200 #ifdef COMPILER1
201 static java_nmethod_stats_struct c1_java_nmethod_stats;
202 #endif
203 #ifdef COMPILER2
204 static java_nmethod_stats_struct c2_java_nmethod_stats;
205 #endif
206 #if INCLUDE_JVMCI
207 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
208 #endif
209 static java_nmethod_stats_struct unknown_java_nmethod_stats;
210
211 static native_nmethod_stats_struct native_nmethod_stats;
212 static pc_nmethod_stats_struct pc_nmethod_stats;
213
214 static void note_java_nmethod(nmethod* nm) {
215 #ifdef COMPILER1
216 if (nm->is_compiled_by_c1()) {
217 c1_java_nmethod_stats.note_nmethod(nm);
218 } else
219 #endif
220 #ifdef COMPILER2
221 if (nm->is_compiled_by_c2()) {
222 c2_java_nmethod_stats.note_nmethod(nm);
223 } else
224 #endif
225 #if INCLUDE_JVMCI
226 if (nm->is_compiled_by_jvmci()) {
227 jvmci_java_nmethod_stats.note_nmethod(nm);
228 } else
229 #endif
230 {
231 unknown_java_nmethod_stats.note_nmethod(nm);
232 }
233 }
234 #endif // !PRODUCT
235
236 //---------------------------------------------------------------------------------
237
238
239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
240 assert(pc != NULL, "Must be non null");
241 assert(exception.not_null(), "Must be non null");
242 assert(handler != NULL, "Must be non null");
243
244 _count = 0;
245 _exception_type = exception->klass();
246 _next = NULL;
247
248 add_address_and_handler(pc,handler);
249 }
250
251
252 address ExceptionCache::match(Handle exception, address pc) {
253 assert(pc != NULL,"Must be non null");
254 assert(exception.not_null(),"Must be non null");
255 if (exception->klass() == exception_type()) {
256 return (test_address(pc));
257 }
258
259 return NULL;
260 }
261
262
263 bool ExceptionCache::match_exception_with_space(Handle exception) {
264 assert(exception.not_null(),"Must be non null");
265 if (exception->klass() == exception_type() && count() < cache_size) {
266 return true;
267 }
268 return false;
269 }
270
271
272 address ExceptionCache::test_address(address addr) {
273 int limit = count();
274 for (int i = 0; i < limit; i++) {
275 if (pc_at(i) == addr) {
276 return handler_at(i);
277 }
278 }
279 return NULL;
280 }
281
282
283 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
284 if (test_address(addr) == handler) return true;
285
286 int index = count();
287 if (index < cache_size) {
288 set_pc_at(index, addr);
289 set_handler_at(index, handler);
290 increment_count();
291 return true;
292 }
293 return false;
294 }
295
296 //-----------------------------------------------------------------------------
297
298
299 // Helper used by both find_pc_desc methods.
300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
301 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
302 if (!approximate)
303 return pc->pc_offset() == pc_offset;
304 else
305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
306 }
307
308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
309 if (initial_pc_desc == NULL) {
310 _pc_descs[0] = NULL; // native method; no PcDescs at all
311 return;
312 }
313 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
314 // reset the cache by filling it with benign (non-null) values
315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
316 for (int i = 0; i < cache_size; i++)
317 _pc_descs[i] = initial_pc_desc;
318 }
319
320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
321 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
322 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
323
324 // Note: one might think that caching the most recently
325 // read value separately would be a win, but one would be
326 // wrong. When many threads are updating it, the cache
327 // line it's in would bounce between caches, negating
328 // any benefit.
329
330 // In order to prevent race conditions do not load cache elements
331 // repeatedly, but use a local copy:
332 PcDesc* res;
333
334 // Step one: Check the most recently added value.
335 res = _pc_descs[0];
336 if (res == NULL) return NULL; // native method; no PcDescs at all
337 if (match_desc(res, pc_offset, approximate)) {
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
339 return res;
340 }
341
342 // Step two: Check the rest of the LRU cache.
343 for (int i = 1; i < cache_size; ++i) {
344 res = _pc_descs[i];
345 if (res->pc_offset() < 0) break; // optimization: skip empty cache
346 if (match_desc(res, pc_offset, approximate)) {
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
348 return res;
349 }
350 }
351
352 // Report failure.
353 return NULL;
354 }
355
356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
358 // Update the LRU cache by shifting pc_desc forward.
359 for (int i = 0; i < cache_size; i++) {
360 PcDesc* next = _pc_descs[i];
361 _pc_descs[i] = pc_desc;
362 pc_desc = next;
363 }
364 }
365
366 // adjust pcs_size so that it is a multiple of both oopSize and
367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
368 // of oopSize, then 2*sizeof(PcDesc) is)
369 static int adjust_pcs_size(int pcs_size) {
370 int nsize = align_up(pcs_size, oopSize);
371 if ((nsize % sizeof(PcDesc)) != 0) {
372 nsize = pcs_size + sizeof(PcDesc);
373 }
374 assert((nsize % oopSize) == 0, "correct alignment");
375 return nsize;
376 }
377
378
379 int nmethod::total_size() const {
380 return
381 consts_size() +
382 insts_size() +
383 stub_size() +
384 scopes_data_size() +
385 scopes_pcs_size() +
386 handler_table_size() +
387 nul_chk_table_size();
388 }
389
390 address* nmethod::orig_pc_addr(const frame* fr) {
391 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
392 }
393
394 const char* nmethod::compile_kind() const {
395 if (is_osr_method()) return "osr";
396 if (method() != NULL && is_native_method()) return "c2n";
397 return NULL;
398 }
399
400 // Fill in default values for various flag fields
401 void nmethod::init_defaults() {
402 _state = not_installed;
403 _has_flushed_dependencies = 0;
404 _lock_count = 0;
405 _stack_traversal_mark = 0;
406 _unload_reported = false; // jvmti state
407 _is_far_code = false; // nmethods are located in CodeCache
408
409 #ifdef ASSERT
410 _oops_are_stale = false;
411 #endif
412
413 _oops_do_mark_link = NULL;
414 _jmethod_id = NULL;
415 _osr_link = NULL;
416 _unloading_next = NULL;
417 _scavenge_root_link = NULL;
418 _scavenge_root_state = 0;
419 #if INCLUDE_RTM_OPT
420 _rtm_state = NoRTM;
421 #endif
422 #if INCLUDE_JVMCI
423 _jvmci_installed_code = NULL;
424 _speculation_log = NULL;
425 _jvmci_installed_code_triggers_unloading = false;
426 #endif
427 }
428
429 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
430 int compile_id,
431 CodeBuffer *code_buffer,
432 int vep_offset,
433 int frame_complete,
434 int frame_size,
435 ByteSize basic_lock_owner_sp_offset,
436 ByteSize basic_lock_sp_offset,
437 OopMapSet* oop_maps) {
438 code_buffer->finalize_oop_references(method);
439 // create nmethod
440 nmethod* nm = NULL;
441 {
442 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
443 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
444 CodeOffsets offsets;
445 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
446 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
447 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
448 compile_id, &offsets,
449 code_buffer, frame_size,
450 basic_lock_owner_sp_offset,
451 basic_lock_sp_offset, oop_maps);
452 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
453 }
454
455 if (nm != NULL) {
456 // verify nmethod
457 debug_only(nm->verify();) // might block
458
459 nm->log_new_nmethod();
460 nm->make_in_use();
461 }
462 return nm;
463 }
464
465 nmethod* nmethod::new_nmethod(const methodHandle& method,
466 int compile_id,
467 int entry_bci,
468 CodeOffsets* offsets,
469 int orig_pc_offset,
470 DebugInformationRecorder* debug_info,
471 Dependencies* dependencies,
472 CodeBuffer* code_buffer, int frame_size,
473 OopMapSet* oop_maps,
474 ExceptionHandlerTable* handler_table,
475 ImplicitExceptionTable* nul_chk_table,
476 AbstractCompiler* compiler,
477 int comp_level
478 #if INCLUDE_JVMCI
479 , jweak installed_code,
480 jweak speculationLog
481 #endif
482 )
483 {
484 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
485 code_buffer->finalize_oop_references(method);
486 // create nmethod
487 nmethod* nm = NULL;
488 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
489 int nmethod_size =
490 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
491 + adjust_pcs_size(debug_info->pcs_size())
492 + align_up((int)dependencies->size_in_bytes(), oopSize)
493 + align_up(handler_table->size_in_bytes() , oopSize)
494 + align_up(nul_chk_table->size_in_bytes() , oopSize)
495 + align_up(debug_info->data_size() , oopSize);
496
497 nm = new (nmethod_size, comp_level)
498 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
499 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
500 oop_maps,
501 handler_table,
502 nul_chk_table,
503 compiler,
504 comp_level
505 #if INCLUDE_JVMCI
506 , installed_code,
507 speculationLog
508 #endif
509 );
510
511 if (nm != NULL) {
512 // To make dependency checking during class loading fast, record
513 // the nmethod dependencies in the classes it is dependent on.
514 // This allows the dependency checking code to simply walk the
515 // class hierarchy above the loaded class, checking only nmethods
516 // which are dependent on those classes. The slow way is to
517 // check every nmethod for dependencies which makes it linear in
518 // the number of methods compiled. For applications with a lot
519 // classes the slow way is too slow.
520 for (Dependencies::DepStream deps(nm); deps.next(); ) {
521 if (deps.type() == Dependencies::call_site_target_value) {
522 // CallSite dependencies are managed on per-CallSite instance basis.
523 oop call_site = deps.argument_oop(0);
524 MethodHandles::add_dependent_nmethod(call_site, nm);
525 } else {
526 Klass* klass = deps.context_type();
527 if (klass == NULL) {
528 continue; // ignore things like evol_method
529 }
530 // record this nmethod as dependent on this klass
531 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
532 }
533 }
534 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
535 }
536 }
537 // Do verification and logging outside CodeCache_lock.
538 if (nm != NULL) {
539 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
540 DEBUG_ONLY(nm->verify();)
541 nm->log_new_nmethod();
542 }
543 return nm;
544 }
545
546 // For native wrappers
547 nmethod::nmethod(
548 Method* method,
549 CompilerType type,
550 int nmethod_size,
551 int compile_id,
552 CodeOffsets* offsets,
553 CodeBuffer* code_buffer,
554 int frame_size,
555 ByteSize basic_lock_owner_sp_offset,
556 ByteSize basic_lock_sp_offset,
557 OopMapSet* oop_maps )
558 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
559 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
560 _native_basic_lock_sp_offset(basic_lock_sp_offset)
561 {
562 {
563 int scopes_data_offset = 0;
564 int deoptimize_offset = 0;
565 int deoptimize_mh_offset = 0;
566
567 debug_only(NoSafepointVerifier nsv;)
568 assert_locked_or_safepoint(CodeCache_lock);
569
570 init_defaults();
571 _entry_bci = InvocationEntryBci;
572 // We have no exception handler or deopt handler make the
573 // values something that will never match a pc like the nmethod vtable entry
574 _exception_offset = 0;
575 _orig_pc_offset = 0;
576
577 _consts_offset = data_offset();
578 _stub_offset = data_offset();
579 _oops_offset = data_offset();
580 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
581 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
582 _scopes_pcs_offset = scopes_data_offset;
583 _dependencies_offset = _scopes_pcs_offset;
584 _handler_table_offset = _dependencies_offset;
585 _nul_chk_table_offset = _handler_table_offset;
586 _nmethod_end_offset = _nul_chk_table_offset;
587 _compile_id = compile_id;
588 _comp_level = CompLevel_none;
589 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
590 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
591 _osr_entry_point = NULL;
592 _exception_cache = NULL;
593 _pc_desc_container.reset_to(NULL);
594 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
595
596 _scopes_data_begin = (address) this + scopes_data_offset;
597 _deopt_handler_begin = (address) this + deoptimize_offset;
598 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
599
600 code_buffer->copy_code_and_locs_to(this);
601 code_buffer->copy_values_to(this);
602 if (ScavengeRootsInCode) {
603 Universe::heap()->register_nmethod(this);
604 }
605 debug_only(Universe::heap()->verify_nmethod(this));
606 CodeCache::commit(this);
607 }
608
609 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
610 ttyLocker ttyl; // keep the following output all in one block
611 // This output goes directly to the tty, not the compiler log.
612 // To enable tools to match it up with the compilation activity,
613 // be sure to tag this tty output with the compile ID.
614 if (xtty != NULL) {
615 xtty->begin_head("print_native_nmethod");
616 xtty->method(_method);
617 xtty->stamp();
618 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
619 }
620 // print the header part first
621 print();
622 // then print the requested information
623 if (PrintNativeNMethods) {
624 print_code();
625 if (oop_maps != NULL) {
626 oop_maps->print();
627 }
628 }
629 if (PrintRelocations) {
630 print_relocations();
631 }
632 if (xtty != NULL) {
633 xtty->tail("print_native_nmethod");
634 }
635 }
636 }
637
638 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
639 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
640 }
641
642 nmethod::nmethod(
643 Method* method,
644 CompilerType type,
645 int nmethod_size,
646 int compile_id,
647 int entry_bci,
648 CodeOffsets* offsets,
649 int orig_pc_offset,
650 DebugInformationRecorder* debug_info,
651 Dependencies* dependencies,
652 CodeBuffer *code_buffer,
653 int frame_size,
654 OopMapSet* oop_maps,
655 ExceptionHandlerTable* handler_table,
656 ImplicitExceptionTable* nul_chk_table,
657 AbstractCompiler* compiler,
658 int comp_level
659 #if INCLUDE_JVMCI
660 , jweak installed_code,
661 jweak speculation_log
662 #endif
663 )
664 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
665 _native_receiver_sp_offset(in_ByteSize(-1)),
666 _native_basic_lock_sp_offset(in_ByteSize(-1))
667 {
668 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
669 {
670 debug_only(NoSafepointVerifier nsv;)
671 assert_locked_or_safepoint(CodeCache_lock);
672
673 _deopt_handler_begin = (address) this;
674 _deopt_mh_handler_begin = (address) this;
675
676 init_defaults();
677 _entry_bci = entry_bci;
678 _compile_id = compile_id;
679 _comp_level = comp_level;
680 _orig_pc_offset = orig_pc_offset;
681 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
682
683 // Section offsets
684 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
685 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
686 set_ctable_begin(header_begin() + _consts_offset);
687
688 #if INCLUDE_JVMCI
689 _jvmci_installed_code = installed_code;
690 _speculation_log = speculation_log;
691 oop obj = JNIHandles::resolve(installed_code);
692 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
693 _jvmci_installed_code_triggers_unloading = false;
694 } else {
695 _jvmci_installed_code_triggers_unloading = true;
696 }
697
698 if (compiler->is_jvmci()) {
699 // JVMCI might not produce any stub sections
700 if (offsets->value(CodeOffsets::Exceptions) != -1) {
701 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
702 } else {
703 _exception_offset = -1;
704 }
705 if (offsets->value(CodeOffsets::Deopt) != -1) {
706 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
707 } else {
708 _deopt_handler_begin = NULL;
709 }
710 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
711 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
712 } else {
713 _deopt_mh_handler_begin = NULL;
714 }
715 } else {
716 #endif
717 // Exception handler and deopt handler are in the stub section
718 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
719 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
720
721 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
722 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
723 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
724 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
725 } else {
726 _deopt_mh_handler_begin = NULL;
727 #if INCLUDE_JVMCI
728 }
729 #endif
730 }
731 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
732 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
733 } else {
734 _unwind_handler_offset = -1;
735 }
736
737 _oops_offset = data_offset();
738 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
739 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
740
741 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
742 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
743 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
744 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
745 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
746 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
747 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
748 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
749 _exception_cache = NULL;
750
751 _scopes_data_begin = (address) this + scopes_data_offset;
752
753 _pc_desc_container.reset_to(scopes_pcs_begin());
754
755 code_buffer->copy_code_and_locs_to(this);
756 // Copy contents of ScopeDescRecorder to nmethod
757 code_buffer->copy_values_to(this);
758 debug_info->copy_to(this);
759 dependencies->copy_to(this);
760 if (ScavengeRootsInCode) {
761 Universe::heap()->register_nmethod(this);
762 }
763 debug_only(Universe::heap()->verify_nmethod(this));
764
765 CodeCache::commit(this);
766
767 // Copy contents of ExceptionHandlerTable to nmethod
768 handler_table->copy_to(this);
769 nul_chk_table->copy_to(this);
770
771 // we use the information of entry points to find out if a method is
772 // static or non static
773 assert(compiler->is_c2() || compiler->is_jvmci() ||
774 _method->is_static() == (entry_point() == _verified_entry_point),
775 " entry points must be same for static methods and vice versa");
776 }
777 }
778
779 // Print a short set of xml attributes to identify this nmethod. The
780 // output should be embedded in some other element.
781 void nmethod::log_identity(xmlStream* log) const {
782 log->print(" compile_id='%d'", compile_id());
783 const char* nm_kind = compile_kind();
784 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
785 log->print(" compiler='%s'", compiler_name());
786 if (TieredCompilation) {
787 log->print(" level='%d'", comp_level());
788 }
789 }
790
791
792 #define LOG_OFFSET(log, name) \
793 if (p2i(name##_end()) - p2i(name##_begin())) \
794 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
795 p2i(name##_begin()) - p2i(this))
796
797
798 void nmethod::log_new_nmethod() const {
799 if (LogCompilation && xtty != NULL) {
800 ttyLocker ttyl;
801 HandleMark hm;
802 xtty->begin_elem("nmethod");
803 log_identity(xtty);
804 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
805 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
806
807 LOG_OFFSET(xtty, relocation);
808 LOG_OFFSET(xtty, consts);
809 LOG_OFFSET(xtty, insts);
810 LOG_OFFSET(xtty, stub);
811 LOG_OFFSET(xtty, scopes_data);
812 LOG_OFFSET(xtty, scopes_pcs);
813 LOG_OFFSET(xtty, dependencies);
814 LOG_OFFSET(xtty, handler_table);
815 LOG_OFFSET(xtty, nul_chk_table);
816 LOG_OFFSET(xtty, oops);
817 LOG_OFFSET(xtty, metadata);
818
819 xtty->method(method());
820 xtty->stamp();
821 xtty->end_elem();
822 }
823 }
824
825 #undef LOG_OFFSET
826
827
828 // Print out more verbose output usually for a newly created nmethod.
829 void nmethod::print_on(outputStream* st, const char* msg) const {
830 if (st != NULL) {
831 ttyLocker ttyl;
832 if (WizardMode) {
833 CompileTask::print(st, this, msg, /*short_form:*/ true);
834 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
835 } else {
836 CompileTask::print(st, this, msg, /*short_form:*/ false);
837 }
838 }
839 }
840
841 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
842 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
843 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
844 print_nmethod(printnmethods);
845 }
846 }
847
848 void nmethod::print_nmethod(bool printmethod) {
849 ttyLocker ttyl; // keep the following output all in one block
850 if (xtty != NULL) {
851 xtty->begin_head("print_nmethod");
852 xtty->stamp();
853 xtty->end_head();
854 }
855 // print the header part first
856 print();
857 // then print the requested information
858 if (printmethod) {
859 print_code();
860 print_pcs();
861 if (oop_maps()) {
862 oop_maps()->print();
863 }
864 }
865 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
866 print_scopes();
867 }
868 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
869 print_relocations();
870 }
871 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
872 print_dependencies();
873 }
874 if (printmethod || PrintExceptionHandlers) {
875 print_handler_table();
876 print_nul_chk_table();
877 }
878 if (printmethod) {
879 print_recorded_oops();
880 print_recorded_metadata();
881 }
882 if (xtty != NULL) {
883 xtty->tail("print_nmethod");
884 }
885 }
886
887
888 // Promote one word from an assembly-time handle to a live embedded oop.
889 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
890 if (handle == NULL ||
891 // As a special case, IC oops are initialized to 1 or -1.
892 handle == (jobject) Universe::non_oop_word()) {
893 (*dest) = (oop) handle;
894 } else {
895 (*dest) = JNIHandles::resolve_non_null(handle);
896 }
897 }
898
899
900 // Have to have the same name because it's called by a template
901 void nmethod::copy_values(GrowableArray<jobject>* array) {
902 int length = array->length();
903 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
904 oop* dest = oops_begin();
905 for (int index = 0 ; index < length; index++) {
906 initialize_immediate_oop(&dest[index], array->at(index));
907 }
908
909 // Now we can fix up all the oops in the code. We need to do this
910 // in the code because the assembler uses jobjects as placeholders.
911 // The code and relocations have already been initialized by the
912 // CodeBlob constructor, so it is valid even at this early point to
913 // iterate over relocations and patch the code.
914 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
915 }
916
917 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
918 int length = array->length();
919 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
920 Metadata** dest = metadata_begin();
921 for (int index = 0 ; index < length; index++) {
922 dest[index] = array->at(index);
923 }
924 }
925
926 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
927 // re-patch all oop-bearing instructions, just in case some oops moved
928 RelocIterator iter(this, begin, end);
929 while (iter.next()) {
930 if (iter.type() == relocInfo::oop_type) {
931 oop_Relocation* reloc = iter.oop_reloc();
932 if (initialize_immediates && reloc->oop_is_immediate()) {
933 oop* dest = reloc->oop_addr();
934 initialize_immediate_oop(dest, (jobject) *dest);
935 }
936 // Refresh the oop-related bits of this instruction.
937 reloc->fix_oop_relocation();
938 } else if (iter.type() == relocInfo::metadata_type) {
939 metadata_Relocation* reloc = iter.metadata_reloc();
940 reloc->fix_metadata_relocation();
941 }
942 }
943 }
944
945
946 void nmethod::verify_clean_inline_caches() {
947 assert_locked_or_safepoint(CompiledIC_lock);
948
949 // If the method is not entrant or zombie then a JMP is plastered over the
950 // first few bytes. If an oop in the old code was there, that oop
951 // should not get GC'd. Skip the first few bytes of oops on
952 // not-entrant methods.
953 address low_boundary = verified_entry_point();
954 if (!is_in_use()) {
955 low_boundary += NativeJump::instruction_size;
956 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
957 // This means that the low_boundary is going to be a little too high.
958 // This shouldn't matter, since oops of non-entrant methods are never used.
959 // In fact, why are we bothering to look at oops in a non-entrant method??
960 }
961
962 ResourceMark rm;
963 RelocIterator iter(this, low_boundary);
964 while(iter.next()) {
965 switch(iter.type()) {
966 case relocInfo::virtual_call_type:
967 case relocInfo::opt_virtual_call_type: {
968 CompiledIC *ic = CompiledIC_at(&iter);
969 // Ok, to lookup references to zombies here
970 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
971 assert(cb != NULL, "destination not in CodeBlob?");
972 nmethod* nm = cb->as_nmethod_or_null();
973 if( nm != NULL ) {
974 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
975 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
976 assert(ic->is_clean(), "IC should be clean");
977 }
978 }
979 break;
980 }
981 case relocInfo::static_call_type: {
982 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
983 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
984 assert(cb != NULL, "destination not in CodeBlob?");
985 nmethod* nm = cb->as_nmethod_or_null();
986 if( nm != NULL ) {
987 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
988 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
989 assert(csc->is_clean(), "IC should be clean");
990 }
991 }
992 break;
993 }
994 default:
995 break;
996 }
997 }
998 }
999
1000 // This is a private interface with the sweeper.
1001 void nmethod::mark_as_seen_on_stack() {
1002 assert(is_alive(), "Must be an alive method");
1003 // Set the traversal mark to ensure that the sweeper does 2
1004 // cleaning passes before moving to zombie.
1005 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1006 }
1007
1008 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1009 // there are no activations on the stack, not in use by the VM,
1010 // and not in use by the ServiceThread)
1011 bool nmethod::can_convert_to_zombie() {
1012 assert(is_not_entrant(), "must be a non-entrant method");
1013
1014 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1015 // count can be greater than the stack traversal count before it hits the
1016 // nmethod for the second time.
1017 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1018 !is_locked_by_vm();
1019 }
1020
1021 void nmethod::inc_decompile_count() {
1022 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1023 // Could be gated by ProfileTraps, but do not bother...
1024 Method* m = method();
1025 if (m == NULL) return;
1026 MethodData* mdo = m->method_data();
1027 if (mdo == NULL) return;
1028 // There is a benign race here. See comments in methodData.hpp.
1029 mdo->inc_decompile_count();
1030 }
1031
1032 void nmethod::make_unloaded(oop cause) {
1033
1034 post_compiled_method_unload();
1035
1036 // This nmethod is being unloaded, make sure that dependencies
1037 // recorded in instanceKlasses get flushed.
1038 // Since this work is being done during a GC, defer deleting dependencies from the
1039 // InstanceKlass.
1040 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1041 flush_dependencies(/*delete_immediately*/false);
1042
1043 // Break cycle between nmethod & method
1044 LogTarget(Trace, class, unload) lt;
1045 if (lt.is_enabled()) {
1046 LogStream ls(lt);
1047 ls.print_cr("making nmethod " INTPTR_FORMAT
1048 " unloadable, Method*(" INTPTR_FORMAT
1049 "), cause(" INTPTR_FORMAT ")",
1050 p2i(this), p2i(_method), p2i(cause));
1051 }
1052 // Unlink the osr method, so we do not look this up again
1053 if (is_osr_method()) {
1054 // Invalidate the osr nmethod only once
1055 if (is_in_use()) {
1056 invalidate_osr_method();
1057 }
1058 #ifdef ASSERT
1059 if (method() != NULL) {
1060 // Make sure osr nmethod is invalidated, i.e. not on the list
1061 bool found = method()->method_holder()->remove_osr_nmethod(this);
1062 assert(!found, "osr nmethod should have been invalidated");
1063 }
1064 #endif
1065 }
1066
1067 // If _method is already NULL the Method* is about to be unloaded,
1068 // so we don't have to break the cycle. Note that it is possible to
1069 // have the Method* live here, in case we unload the nmethod because
1070 // it is pointing to some oop (other than the Method*) being unloaded.
1071 if (_method != NULL) {
1072 // OSR methods point to the Method*, but the Method* does not
1073 // point back!
1074 if (_method->code() == this) {
1075 _method->clear_code(); // Break a cycle
1076 }
1077 _method = NULL; // Clear the method of this dead nmethod
1078 }
1079
1080 // Make the class unloaded - i.e., change state and notify sweeper
1081 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1082 if (is_in_use()) {
1083 // Transitioning directly from live to unloaded -- so
1084 // we need to force a cache clean-up; remember this
1085 // for later on.
1086 CodeCache::set_needs_cache_clean(true);
1087 }
1088
1089 // Unregister must be done before the state change
1090 Universe::heap()->unregister_nmethod(this);
1091
1092 _state = unloaded;
1093
1094 // Log the unloading.
1095 log_state_change();
1096
1097 #if INCLUDE_JVMCI
1098 // The method can only be unloaded after the pointer to the installed code
1099 // Java wrapper is no longer alive. Here we need to clear out this weak
1100 // reference to the dead object.
1101 maybe_invalidate_installed_code();
1102 #endif
1103
1104 // The Method* is gone at this point
1105 assert(_method == NULL, "Tautology");
1106
1107 set_osr_link(NULL);
1108 NMethodSweeper::report_state_change(this);
1109 }
1110
1111 void nmethod::invalidate_osr_method() {
1112 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1113 // Remove from list of active nmethods
1114 if (method() != NULL) {
1115 method()->method_holder()->remove_osr_nmethod(this);
1116 }
1117 }
1118
1119 void nmethod::log_state_change() const {
1120 if (LogCompilation) {
1121 if (xtty != NULL) {
1122 ttyLocker ttyl; // keep the following output all in one block
1123 if (_state == unloaded) {
1124 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1125 os::current_thread_id());
1126 } else {
1127 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1128 os::current_thread_id(),
1129 (_state == zombie ? " zombie='1'" : ""));
1130 }
1131 log_identity(xtty);
1132 xtty->stamp();
1133 xtty->end_elem();
1134 }
1135 }
1136
1137 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1138 CompileTask::print_ul(this, state_msg);
1139 if (PrintCompilation && _state != unloaded) {
1140 print_on(tty, state_msg);
1141 }
1142 }
1143
1144 /**
1145 * Common functionality for both make_not_entrant and make_zombie
1146 */
1147 bool nmethod::make_not_entrant_or_zombie(int state) {
1148 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1149 assert(!is_zombie(), "should not already be a zombie");
1150
1151 if (_state == state) {
1152 // Avoid taking the lock if already in required state.
1153 // This is safe from races because the state is an end-state,
1154 // which the nmethod cannot back out of once entered.
1155 // No need for fencing either.
1156 return false;
1157 }
1158
1159 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1160 nmethodLocker nml(this);
1161 methodHandle the_method(method());
1162 NoSafepointVerifier nsv;
1163
1164 // during patching, depending on the nmethod state we must notify the GC that
1165 // code has been unloaded, unregistering it. We cannot do this right while
1166 // holding the Patching_lock because we need to use the CodeCache_lock. This
1167 // would be prone to deadlocks.
1168 // This flag is used to remember whether we need to later lock and unregister.
1169 bool nmethod_needs_unregister = false;
1170
1171 {
1172 // invalidate osr nmethod before acquiring the patching lock since
1173 // they both acquire leaf locks and we don't want a deadlock.
1174 // This logic is equivalent to the logic below for patching the
1175 // verified entry point of regular methods. We check that the
1176 // nmethod is in use to ensure that it is invalidated only once.
1177 if (is_osr_method() && is_in_use()) {
1178 // this effectively makes the osr nmethod not entrant
1179 invalidate_osr_method();
1180 }
1181
1182 // Enter critical section. Does not block for safepoint.
1183 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1184
1185 if (_state == state) {
1186 // another thread already performed this transition so nothing
1187 // to do, but return false to indicate this.
1188 return false;
1189 }
1190
1191 // The caller can be calling the method statically or through an inline
1192 // cache call.
1193 if (!is_osr_method() && !is_not_entrant()) {
1194 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1195 SharedRuntime::get_handle_wrong_method_stub());
1196 }
1197
1198 if (is_in_use() && update_recompile_counts()) {
1199 // It's a true state change, so mark the method as decompiled.
1200 // Do it only for transition from alive.
1201 inc_decompile_count();
1202 }
1203
1204 // If the state is becoming a zombie, signal to unregister the nmethod with
1205 // the heap.
1206 // This nmethod may have already been unloaded during a full GC.
1207 if ((state == zombie) && !is_unloaded()) {
1208 nmethod_needs_unregister = true;
1209 }
1210
1211 // Must happen before state change. Otherwise we have a race condition in
1212 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1213 // transition its state from 'not_entrant' to 'zombie' without having to wait
1214 // for stack scanning.
1215 if (state == not_entrant) {
1216 mark_as_seen_on_stack();
1217 OrderAccess::storestore(); // _stack_traversal_mark and _state
1218 }
1219
1220 // Change state
1221 _state = state;
1222
1223 // Log the transition once
1224 log_state_change();
1225
1226 // Invalidate while holding the patching lock
1227 JVMCI_ONLY(maybe_invalidate_installed_code());
1228
1229 // Remove nmethod from method.
1230 // We need to check if both the _code and _from_compiled_code_entry_point
1231 // refer to this nmethod because there is a race in setting these two fields
1232 // in Method* as seen in bugid 4947125.
1233 // If the vep() points to the zombie nmethod, the memory for the nmethod
1234 // could be flushed and the compiler and vtable stubs could still call
1235 // through it.
1236 if (method() != NULL && (method()->code() == this ||
1237 method()->from_compiled_entry() == verified_entry_point())) {
1238 HandleMark hm;
1239 method()->clear_code(false /* already owns Patching_lock */);
1240 }
1241 } // leave critical region under Patching_lock
1242
1243 #ifdef ASSERT
1244 if (is_osr_method() && method() != NULL) {
1245 // Make sure osr nmethod is invalidated, i.e. not on the list
1246 bool found = method()->method_holder()->remove_osr_nmethod(this);
1247 assert(!found, "osr nmethod should have been invalidated");
1248 }
1249 #endif
1250
1251 // When the nmethod becomes zombie it is no longer alive so the
1252 // dependencies must be flushed. nmethods in the not_entrant
1253 // state will be flushed later when the transition to zombie
1254 // happens or they get unloaded.
1255 if (state == zombie) {
1256 {
1257 // Flushing dependencies must be done before any possible
1258 // safepoint can sneak in, otherwise the oops used by the
1259 // dependency logic could have become stale.
1260 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1261 if (nmethod_needs_unregister) {
1262 Universe::heap()->unregister_nmethod(this);
1263 }
1264 flush_dependencies(/*delete_immediately*/true);
1265 }
1266
1267 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1268 // event and it hasn't already been reported for this nmethod then
1269 // report it now. The event may have been reported earlier if the GC
1270 // marked it for unloading). JvmtiDeferredEventQueue support means
1271 // we no longer go to a safepoint here.
1272 post_compiled_method_unload();
1273
1274 #ifdef ASSERT
1275 // It's no longer safe to access the oops section since zombie
1276 // nmethods aren't scanned for GC.
1277 _oops_are_stale = true;
1278 #endif
1279 // the Method may be reclaimed by class unloading now that the
1280 // nmethod is in zombie state
1281 set_method(NULL);
1282 } else {
1283 assert(state == not_entrant, "other cases may need to be handled differently");
1284 }
1285
1286 if (TraceCreateZombies) {
1287 ResourceMark m;
1288 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");
1289 }
1290
1291 NMethodSweeper::report_state_change(this);
1292 return true;
1293 }
1294
1295 void nmethod::flush() {
1296 // Note that there are no valid oops in the nmethod anymore.
1297 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1298 "osr nmethod must be unloaded or zombie before flushing");
1299 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1301 assert_locked_or_safepoint(CodeCache_lock);
1302
1303 // completely deallocate this method
1304 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1305 if (PrintMethodFlushing) {
1306 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1307 "/Free CodeCache:" SIZE_FORMAT "Kb",
1308 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1309 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1310 }
1311
1312 // We need to deallocate any ExceptionCache data.
1313 // Note that we do not need to grab the nmethod lock for this, it
1314 // better be thread safe if we're disposing of it!
1315 ExceptionCache* ec = exception_cache();
1316 set_exception_cache(NULL);
1317 while(ec != NULL) {
1318 ExceptionCache* next = ec->next();
1319 delete ec;
1320 ec = next;
1321 }
1322
1323 if (on_scavenge_root_list()) {
1324 CodeCache::drop_scavenge_root_nmethod(this);
1325 }
1326
1327 #if INCLUDE_JVMCI
1328 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1329 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1330 #endif
1331
1332 CodeBlob::flush();
1333 CodeCache::free(this);
1334 }
1335
1336 //
1337 // Notify all classes this nmethod is dependent on that it is no
1338 // longer dependent. This should only be called in two situations.
1339 // First, when a nmethod transitions to a zombie all dependents need
1340 // to be clear. Since zombification happens at a safepoint there's no
1341 // synchronization issues. The second place is a little more tricky.
1342 // During phase 1 of mark sweep class unloading may happen and as a
1343 // result some nmethods may get unloaded. In this case the flushing
1344 // of dependencies must happen during phase 1 since after GC any
1345 // dependencies in the unloaded nmethod won't be updated, so
1346 // traversing the dependency information in unsafe. In that case this
1347 // function is called with a boolean argument and this function only
1348 // notifies instanceKlasses that are reachable
1349
1350 void nmethod::flush_dependencies(bool delete_immediately) {
1351 assert_locked_or_safepoint(CodeCache_lock);
1352 assert(Universe::heap()->is_gc_active() != delete_immediately,
1353 "delete_immediately is false if and only if we are called during GC");
1354 if (!has_flushed_dependencies()) {
1355 set_has_flushed_dependencies();
1356 for (Dependencies::DepStream deps(this); deps.next(); ) {
1357 if (deps.type() == Dependencies::call_site_target_value) {
1358 // CallSite dependencies are managed on per-CallSite instance basis.
1359 oop call_site = deps.argument_oop(0);
1360 MethodHandles::remove_dependent_nmethod(call_site, this);
1361 } else {
1362 Klass* klass = deps.context_type();
1363 if (klass == NULL) {
1364 continue; // ignore things like evol_method
1365 }
1366 // During GC delete_immediately is false, and liveness
1367 // of dependee determines class that needs to be updated.
1368 if (delete_immediately || klass->is_loader_alive()) {
1369 // The GC defers deletion of this entry, since there might be multiple threads
1370 // iterating over the _dependencies graph. Other call paths are single-threaded
1371 // and may delete it immediately.
1372 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1373 }
1374 }
1375 }
1376 }
1377 }
1378
1379
1380 // If this oop is not live, the nmethod can be unloaded.
1381 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1382 assert(root != NULL, "just checking");
1383 oop obj = *root;
1384 if (obj == NULL || is_alive->do_object_b(obj)) {
1385 return false;
1386 }
1387
1388 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1389 // simply because one of its constant oops has gone dead.
1390 // No actual classes need to be unloaded in order for this to occur.
1391 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1392 make_unloaded(obj);
1393 return true;
1394 }
1395
1396 // ------------------------------------------------------------------
1397 // post_compiled_method_load_event
1398 // new method for install_code() path
1399 // Transfer information from compilation to jvmti
1400 void nmethod::post_compiled_method_load_event() {
1401
1402 Method* moop = method();
1403 HOTSPOT_COMPILED_METHOD_LOAD(
1404 (char *) moop->klass_name()->bytes(),
1405 moop->klass_name()->utf8_length(),
1406 (char *) moop->name()->bytes(),
1407 moop->name()->utf8_length(),
1408 (char *) moop->signature()->bytes(),
1409 moop->signature()->utf8_length(),
1410 insts_begin(), insts_size());
1411
1412 if (JvmtiExport::should_post_compiled_method_load() ||
1413 JvmtiExport::should_post_compiled_method_unload()) {
1414 get_and_cache_jmethod_id();
1415 }
1416
1417 if (JvmtiExport::should_post_compiled_method_load()) {
1418 // Let the Service thread (which is a real Java thread) post the event
1419 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1420 JvmtiDeferredEventQueue::enqueue(
1421 JvmtiDeferredEvent::compiled_method_load_event(this));
1422 }
1423 }
1424
1425 jmethodID nmethod::get_and_cache_jmethod_id() {
1426 if (_jmethod_id == NULL) {
1427 // Cache the jmethod_id since it can no longer be looked up once the
1428 // method itself has been marked for unloading.
1429 _jmethod_id = method()->jmethod_id();
1430 }
1431 return _jmethod_id;
1432 }
1433
1434 void nmethod::post_compiled_method_unload() {
1435 if (unload_reported()) {
1436 // During unloading we transition to unloaded and then to zombie
1437 // and the unloading is reported during the first transition.
1438 return;
1439 }
1440
1441 assert(_method != NULL && !is_unloaded(), "just checking");
1442 DTRACE_METHOD_UNLOAD_PROBE(method());
1443
1444 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1445 // post the event. Sometime later this nmethod will be made a zombie
1446 // by the sweeper but the Method* will not be valid at that point.
1447 // If the _jmethod_id is null then no load event was ever requested
1448 // so don't bother posting the unload. The main reason for this is
1449 // that the jmethodID is a weak reference to the Method* so if
1450 // it's being unloaded there's no way to look it up since the weak
1451 // ref will have been cleared.
1452 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1453 assert(!unload_reported(), "already unloaded");
1454 JvmtiDeferredEvent event =
1455 JvmtiDeferredEvent::compiled_method_unload_event(this,
1456 _jmethod_id, insts_begin());
1457 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1458 JvmtiDeferredEventQueue::enqueue(event);
1459 }
1460
1461 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1462 // any time. As the nmethod is being unloaded now we mark it has
1463 // having the unload event reported - this will ensure that we don't
1464 // attempt to report the event in the unlikely scenario where the
1465 // event is enabled at the time the nmethod is made a zombie.
1466 set_unload_reported();
1467 }
1468
1469 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1470 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1471
1472 oop_Relocation* r = iter_at_oop->oop_reloc();
1473 // Traverse those oops directly embedded in the code.
1474 // Other oops (oop_index>0) are seen as part of scopes_oops.
1475 assert(1 == (r->oop_is_immediate()) +
1476 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1477 "oop must be found in exactly one place");
1478 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1479 // Unload this nmethod if the oop is dead.
1480 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1481 return true;;
1482 }
1483 }
1484
1485 return false;
1486 }
1487
1488 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1489 // Scopes
1490 for (oop* p = oops_begin(); p < oops_end(); p++) {
1491 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1492 if (can_unload(is_alive, p, unloading_occurred)) {
1493 return true;
1494 }
1495 }
1496 return false;
1497 }
1498
1499 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1500 // Compiled code
1501
1502 // Prevent extra code cache walk for platforms that don't have immediate oops.
1503 if (relocInfo::mustIterateImmediateOopsInCode()) {
1504 RelocIterator iter(this, low_boundary);
1505 while (iter.next()) {
1506 if (iter.type() == relocInfo::oop_type) {
1507 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1508 return true;
1509 }
1510 }
1511 }
1512 }
1513
1514 return do_unloading_scopes(is_alive, unloading_occurred);
1515 }
1516
1517 #if INCLUDE_JVMCI
1518 bool nmethod::do_unloading_jvmci(bool unloading_occurred) {
1519 if (_jvmci_installed_code != NULL) {
1520 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1521 if (_jvmci_installed_code_triggers_unloading) {
1522 // jweak reference processing has already cleared the referent
1523 make_unloaded(NULL);
1524 return true;
1525 } else {
1526 clear_jvmci_installed_code();
1527 }
1528 }
1529 }
1530 return false;
1531 }
1532 #endif
1533
1534 // Iterate over metadata calling this function. Used by RedefineClasses
1535 void nmethod::metadata_do(void f(Metadata*)) {
1536 address low_boundary = verified_entry_point();
1537 if (is_not_entrant()) {
1538 low_boundary += NativeJump::instruction_size;
1539 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1540 // (See comment above.)
1541 }
1542 {
1543 // Visit all immediate references that are embedded in the instruction stream.
1544 RelocIterator iter(this, low_boundary);
1545 while (iter.next()) {
1546 if (iter.type() == relocInfo::metadata_type ) {
1547 metadata_Relocation* r = iter.metadata_reloc();
1548 // In this metadata, we must only follow those metadatas directly embedded in
1549 // the code. Other metadatas (oop_index>0) are seen as part of
1550 // the metadata section below.
1551 assert(1 == (r->metadata_is_immediate()) +
1552 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1553 "metadata must be found in exactly one place");
1554 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1555 Metadata* md = r->metadata_value();
1556 if (md != _method) f(md);
1557 }
1558 } else if (iter.type() == relocInfo::virtual_call_type) {
1559 // Check compiledIC holders associated with this nmethod
1560 CompiledIC *ic = CompiledIC_at(&iter);
1561 if (ic->is_icholder_call()) {
1562 CompiledICHolder* cichk = ic->cached_icholder();
1563 f(cichk->holder_metadata());
1564 f(cichk->holder_klass());
1565 } else {
1566 Metadata* ic_oop = ic->cached_metadata();
1567 if (ic_oop != NULL) {
1568 f(ic_oop);
1569 }
1570 }
1571 }
1572 }
1573 }
1574
1575 // Visit the metadata section
1576 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1577 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1578 Metadata* md = *p;
1579 f(md);
1580 }
1581
1582 // Visit metadata not embedded in the other places.
1583 if (_method != NULL) f(_method);
1584 }
1585
1586 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1587 // make sure the oops ready to receive visitors
1588 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1589 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1590
1591 // If the method is not entrant or zombie then a JMP is plastered over the
1592 // first few bytes. If an oop in the old code was there, that oop
1593 // should not get GC'd. Skip the first few bytes of oops on
1594 // not-entrant methods.
1595 address low_boundary = verified_entry_point();
1596 if (is_not_entrant()) {
1597 low_boundary += NativeJump::instruction_size;
1598 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1599 // (See comment above.)
1600 }
1601
1602 // Prevent extra code cache walk for platforms that don't have immediate oops.
1603 if (relocInfo::mustIterateImmediateOopsInCode()) {
1604 RelocIterator iter(this, low_boundary);
1605
1606 while (iter.next()) {
1607 if (iter.type() == relocInfo::oop_type ) {
1608 oop_Relocation* r = iter.oop_reloc();
1609 // In this loop, we must only follow those oops directly embedded in
1610 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1611 assert(1 == (r->oop_is_immediate()) +
1612 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1613 "oop must be found in exactly one place");
1614 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1615 f->do_oop(r->oop_addr());
1616 }
1617 }
1618 }
1619 }
1620
1621 // Scopes
1622 // This includes oop constants not inlined in the code stream.
1623 for (oop* p = oops_begin(); p < oops_end(); p++) {
1624 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1625 f->do_oop(p);
1626 }
1627 }
1628
1629 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1630
1631 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1632
1633 // An nmethod is "marked" if its _mark_link is set non-null.
1634 // Even if it is the end of the linked list, it will have a non-null link value,
1635 // as long as it is on the list.
1636 // This code must be MP safe, because it is used from parallel GC passes.
1637 bool nmethod::test_set_oops_do_mark() {
1638 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1639 if (_oops_do_mark_link == NULL) {
1640 // Claim this nmethod for this thread to mark.
1641 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1642 // Atomically append this nmethod (now claimed) to the head of the list:
1643 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1644 for (;;) {
1645 nmethod* required_mark_nmethods = observed_mark_nmethods;
1646 _oops_do_mark_link = required_mark_nmethods;
1647 observed_mark_nmethods =
1648 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1649 if (observed_mark_nmethods == required_mark_nmethods)
1650 break;
1651 }
1652 // Mark was clear when we first saw this guy.
1653 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1654 return false;
1655 }
1656 }
1657 // On fall through, another racing thread marked this nmethod before we did.
1658 return true;
1659 }
1660
1661 void nmethod::oops_do_marking_prologue() {
1662 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1663 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1664 // We use cmpxchg instead of regular assignment here because the user
1665 // may fork a bunch of threads, and we need them all to see the same state.
1666 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1667 guarantee(observed == NULL, "no races in this sequential code");
1668 }
1669
1670 void nmethod::oops_do_marking_epilogue() {
1671 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1672 nmethod* cur = _oops_do_mark_nmethods;
1673 while (cur != NMETHOD_SENTINEL) {
1674 assert(cur != NULL, "not NULL-terminated");
1675 nmethod* next = cur->_oops_do_mark_link;
1676 cur->_oops_do_mark_link = NULL;
1677 DEBUG_ONLY(cur->verify_oop_relocations());
1678 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1679 cur = next;
1680 }
1681 nmethod* required = _oops_do_mark_nmethods;
1682 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1683 guarantee(observed == required, "no races in this sequential code");
1684 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1685 }
1686
1687 class DetectScavengeRoot: public OopClosure {
1688 bool _detected_scavenge_root;
1689 public:
1690 DetectScavengeRoot() : _detected_scavenge_root(false)
1691 { NOT_PRODUCT(_print_nm = NULL); }
1692 bool detected_scavenge_root() { return _detected_scavenge_root; }
1693 virtual void do_oop(oop* p) {
1694 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1695 NOT_PRODUCT(maybe_print(p));
1696 _detected_scavenge_root = true;
1697 }
1698 }
1699 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1700
1701 #ifndef PRODUCT
1702 nmethod* _print_nm;
1703 void maybe_print(oop* p) {
1704 if (_print_nm == NULL) return;
1705 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1706 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1707 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1708 p2i(*p), p2i(p));
1709 (*p)->print();
1710 }
1711 #endif //PRODUCT
1712 };
1713
1714 bool nmethod::detect_scavenge_root_oops() {
1715 DetectScavengeRoot detect_scavenge_root;
1716 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1717 oops_do(&detect_scavenge_root);
1718 return detect_scavenge_root.detected_scavenge_root();
1719 }
1720
1721 inline bool includes(void* p, void* from, void* to) {
1722 return from <= p && p < to;
1723 }
1724
1725
1726 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1727 assert(count >= 2, "must be sentinel values, at least");
1728
1729 #ifdef ASSERT
1730 // must be sorted and unique; we do a binary search in find_pc_desc()
1731 int prev_offset = pcs[0].pc_offset();
1732 assert(prev_offset == PcDesc::lower_offset_limit,
1733 "must start with a sentinel");
1734 for (int i = 1; i < count; i++) {
1735 int this_offset = pcs[i].pc_offset();
1736 assert(this_offset > prev_offset, "offsets must be sorted");
1737 prev_offset = this_offset;
1738 }
1739 assert(prev_offset == PcDesc::upper_offset_limit,
1740 "must end with a sentinel");
1741 #endif //ASSERT
1742
1743 // Search for MethodHandle invokes and tag the nmethod.
1744 for (int i = 0; i < count; i++) {
1745 if (pcs[i].is_method_handle_invoke()) {
1746 set_has_method_handle_invokes(true);
1747 break;
1748 }
1749 }
1750 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1751
1752 int size = count * sizeof(PcDesc);
1753 assert(scopes_pcs_size() >= size, "oob");
1754 memcpy(scopes_pcs_begin(), pcs, size);
1755
1756 // Adjust the final sentinel downward.
1757 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1758 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1759 last_pc->set_pc_offset(content_size() + 1);
1760 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1761 // Fill any rounding gaps with copies of the last record.
1762 last_pc[1] = last_pc[0];
1763 }
1764 // The following assert could fail if sizeof(PcDesc) is not
1765 // an integral multiple of oopSize (the rounding term).
1766 // If it fails, change the logic to always allocate a multiple
1767 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1768 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1769 }
1770
1771 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1772 assert(scopes_data_size() >= size, "oob");
1773 memcpy(scopes_data_begin(), buffer, size);
1774 }
1775
1776 #ifdef ASSERT
1777 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1778 PcDesc* lower = search.scopes_pcs_begin();
1779 PcDesc* upper = search.scopes_pcs_end();
1780 lower += 1; // exclude initial sentinel
1781 PcDesc* res = NULL;
1782 for (PcDesc* p = lower; p < upper; p++) {
1783 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1784 if (match_desc(p, pc_offset, approximate)) {
1785 if (res == NULL)
1786 res = p;
1787 else
1788 res = (PcDesc*) badAddress;
1789 }
1790 }
1791 return res;
1792 }
1793 #endif
1794
1795
1796 // Finds a PcDesc with real-pc equal to "pc"
1797 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1798 address base_address = search.code_begin();
1799 if ((pc < base_address) ||
1800 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1801 return NULL; // PC is wildly out of range
1802 }
1803 int pc_offset = (int) (pc - base_address);
1804
1805 // Check the PcDesc cache if it contains the desired PcDesc
1806 // (This as an almost 100% hit rate.)
1807 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1808 if (res != NULL) {
1809 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1810 return res;
1811 }
1812
1813 // Fallback algorithm: quasi-linear search for the PcDesc
1814 // Find the last pc_offset less than the given offset.
1815 // The successor must be the required match, if there is a match at all.
1816 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1817 PcDesc* lower = search.scopes_pcs_begin();
1818 PcDesc* upper = search.scopes_pcs_end();
1819 upper -= 1; // exclude final sentinel
1820 if (lower >= upper) return NULL; // native method; no PcDescs at all
1821
1822 #define assert_LU_OK \
1823 /* invariant on lower..upper during the following search: */ \
1824 assert(lower->pc_offset() < pc_offset, "sanity"); \
1825 assert(upper->pc_offset() >= pc_offset, "sanity")
1826 assert_LU_OK;
1827
1828 // Use the last successful return as a split point.
1829 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1830 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1831 if (mid->pc_offset() < pc_offset) {
1832 lower = mid;
1833 } else {
1834 upper = mid;
1835 }
1836
1837 // Take giant steps at first (4096, then 256, then 16, then 1)
1838 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1839 const int RADIX = (1 << LOG2_RADIX);
1840 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1841 while ((mid = lower + step) < upper) {
1842 assert_LU_OK;
1843 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1844 if (mid->pc_offset() < pc_offset) {
1845 lower = mid;
1846 } else {
1847 upper = mid;
1848 break;
1849 }
1850 }
1851 assert_LU_OK;
1852 }
1853
1854 // Sneak up on the value with a linear search of length ~16.
1855 while (true) {
1856 assert_LU_OK;
1857 mid = lower + 1;
1858 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1859 if (mid->pc_offset() < pc_offset) {
1860 lower = mid;
1861 } else {
1862 upper = mid;
1863 break;
1864 }
1865 }
1866 #undef assert_LU_OK
1867
1868 if (match_desc(upper, pc_offset, approximate)) {
1869 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1870 _pc_desc_cache.add_pc_desc(upper);
1871 return upper;
1872 } else {
1873 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1874 return NULL;
1875 }
1876 }
1877
1878
1879 void nmethod::check_all_dependencies(DepChange& changes) {
1880 // Checked dependencies are allocated into this ResourceMark
1881 ResourceMark rm;
1882
1883 // Turn off dependency tracing while actually testing dependencies.
1884 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1885
1886 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1887 &DependencySignature::equals, 11027> DepTable;
1888
1889 DepTable* table = new DepTable();
1890
1891 // Iterate over live nmethods and check dependencies of all nmethods that are not
1892 // marked for deoptimization. A particular dependency is only checked once.
1893 NMethodIterator iter;
1894 while(iter.next()) {
1895 nmethod* nm = iter.method();
1896 // Only notify for live nmethods
1897 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1898 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1899 // Construct abstraction of a dependency.
1900 DependencySignature* current_sig = new DependencySignature(deps);
1901
1902 // Determine if dependency is already checked. table->put(...) returns
1903 // 'true' if the dependency is added (i.e., was not in the hashtable).
1904 if (table->put(*current_sig, 1)) {
1905 if (deps.check_dependency() != NULL) {
1906 // Dependency checking failed. Print out information about the failed
1907 // dependency and finally fail with an assert. We can fail here, since
1908 // dependency checking is never done in a product build.
1909 tty->print_cr("Failed dependency:");
1910 changes.print();
1911 nm->print();
1912 nm->print_dependencies();
1913 assert(false, "Should have been marked for deoptimization");
1914 }
1915 }
1916 }
1917 }
1918 }
1919 }
1920
1921 bool nmethod::check_dependency_on(DepChange& changes) {
1922 // What has happened:
1923 // 1) a new class dependee has been added
1924 // 2) dependee and all its super classes have been marked
1925 bool found_check = false; // set true if we are upset
1926 for (Dependencies::DepStream deps(this); deps.next(); ) {
1927 // Evaluate only relevant dependencies.
1928 if (deps.spot_check_dependency_at(changes) != NULL) {
1929 found_check = true;
1930 NOT_DEBUG(break);
1931 }
1932 }
1933 return found_check;
1934 }
1935
1936 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1937 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1938 Array<Method*>* dependee_methods = dependee_ik->methods();
1939 for (Dependencies::DepStream deps(this); deps.next(); ) {
1940 if (deps.type() == Dependencies::evol_method) {
1941 Method* method = deps.method_argument(0);
1942 for (int j = 0; j < dependee_methods->length(); j++) {
1943 if (dependee_methods->at(j) == method) {
1944 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1945 ResourceMark rm;
1946 log_debug(redefine, class, nmethod)
1947 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1948 _method->method_holder()->external_name(),
1949 _method->name()->as_C_string(),
1950 _method->signature()->as_C_string(),
1951 compile_id(),
1952 method->method_holder()->external_name(),
1953 method->name()->as_C_string(),
1954 method->signature()->as_C_string());
1955 }
1956 if (TraceDependencies || LogCompilation)
1957 deps.log_dependency(dependee);
1958 return true;
1959 }
1960 }
1961 }
1962 }
1963 return false;
1964 }
1965
1966 // Called from mark_for_deoptimization, when dependee is invalidated.
1967 bool nmethod::is_dependent_on_method(Method* dependee) {
1968 for (Dependencies::DepStream deps(this); deps.next(); ) {
1969 if (deps.type() != Dependencies::evol_method)
1970 continue;
1971 Method* method = deps.method_argument(0);
1972 if (method == dependee) return true;
1973 }
1974 return false;
1975 }
1976
1977
1978 bool nmethod::is_patchable_at(address instr_addr) {
1979 assert(insts_contains(instr_addr), "wrong nmethod used");
1980 if (is_zombie()) {
1981 // a zombie may never be patched
1982 return false;
1983 }
1984 return true;
1985 }
1986
1987
1988 address nmethod::continuation_for_implicit_exception(address pc) {
1989 // Exception happened outside inline-cache check code => we are inside
1990 // an active nmethod => use cpc to determine a return address
1991 int exception_offset = pc - code_begin();
1992 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1993 #ifdef ASSERT
1994 if (cont_offset == 0) {
1995 Thread* thread = Thread::current();
1996 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1997 HandleMark hm(thread);
1998 ResourceMark rm(thread);
1999 CodeBlob* cb = CodeCache::find_blob(pc);
2000 assert(cb != NULL && cb == this, "");
2001 ttyLocker ttyl;
2002 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2003 print();
2004 method()->print_codes();
2005 print_code();
2006 print_pcs();
2007 }
2008 #endif
2009 if (cont_offset == 0) {
2010 // Let the normal error handling report the exception
2011 return NULL;
2012 }
2013 return code_begin() + cont_offset;
2014 }
2015
2016
2017
2018 void nmethod_init() {
2019 // make sure you didn't forget to adjust the filler fields
2020 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2021 }
2022
2023
2024 //-------------------------------------------------------------------------------------------
2025
2026
2027 // QQQ might we make this work from a frame??
2028 nmethodLocker::nmethodLocker(address pc) {
2029 CodeBlob* cb = CodeCache::find_blob(pc);
2030 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2031 _nm = cb->as_compiled_method();
2032 lock_nmethod(_nm);
2033 }
2034
2035 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2036 // should pass zombie_ok == true.
2037 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2038 if (cm == NULL) return;
2039 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2040 nmethod* nm = cm->as_nmethod();
2041 Atomic::inc(&nm->_lock_count);
2042 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2043 }
2044
2045 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2046 if (cm == NULL) return;
2047 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2048 nmethod* nm = cm->as_nmethod();
2049 Atomic::dec(&nm->_lock_count);
2050 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2051 }
2052
2053
2054 // -----------------------------------------------------------------------------
2055 // Verification
2056
2057 class VerifyOopsClosure: public OopClosure {
2058 nmethod* _nm;
2059 bool _ok;
2060 public:
2061 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2062 bool ok() { return _ok; }
2063 virtual void do_oop(oop* p) {
2064 if (oopDesc::is_oop_or_null(*p)) return;
2065 if (_ok) {
2066 _nm->print_nmethod(true);
2067 _ok = false;
2068 }
2069 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2070 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2071 }
2072 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2073 };
2074
2075 void nmethod::verify() {
2076
2077 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2078 // seems odd.
2079
2080 if (is_zombie() || is_not_entrant() || is_unloaded())
2081 return;
2082
2083 // Make sure all the entry points are correctly aligned for patching.
2084 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2085
2086 // assert(oopDesc::is_oop(method()), "must be valid");
2087
2088 ResourceMark rm;
2089
2090 if (!CodeCache::contains(this)) {
2091 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2092 }
2093
2094 if(is_native_method() )
2095 return;
2096
2097 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2098 if (nm != this) {
2099 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2100 }
2101
2102 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2103 if (! p->verify(this)) {
2104 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2105 }
2106 }
2107
2108 VerifyOopsClosure voc(this);
2109 oops_do(&voc);
2110 assert(voc.ok(), "embedded oops must be OK");
2111 Universe::heap()->verify_nmethod(this);
2112
2113 verify_scopes();
2114 }
2115
2116
2117 void nmethod::verify_interrupt_point(address call_site) {
2118 // Verify IC only when nmethod installation is finished.
2119 if (!is_not_installed()) {
2120 Thread *cur = Thread::current();
2121 if (CompiledIC_lock->owner() == cur ||
2122 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2123 SafepointSynchronize::is_at_safepoint())) {
2124 CompiledIC_at(this, call_site);
2125 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2126 } else {
2127 MutexLocker ml_verify (CompiledIC_lock);
2128 CompiledIC_at(this, call_site);
2129 }
2130 }
2131
2132 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2133 assert(pd != NULL, "PcDesc must exist");
2134 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2135 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2136 pd->return_oop());
2137 !sd->is_top(); sd = sd->sender()) {
2138 sd->verify();
2139 }
2140 }
2141
2142 void nmethod::verify_scopes() {
2143 if( !method() ) return; // Runtime stubs have no scope
2144 if (method()->is_native()) return; // Ignore stub methods.
2145 // iterate through all interrupt point
2146 // and verify the debug information is valid.
2147 RelocIterator iter((nmethod*)this);
2148 while (iter.next()) {
2149 address stub = NULL;
2150 switch (iter.type()) {
2151 case relocInfo::virtual_call_type:
2152 verify_interrupt_point(iter.addr());
2153 break;
2154 case relocInfo::opt_virtual_call_type:
2155 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2156 verify_interrupt_point(iter.addr());
2157 break;
2158 case relocInfo::static_call_type:
2159 stub = iter.static_call_reloc()->static_stub(false);
2160 //verify_interrupt_point(iter.addr());
2161 break;
2162 case relocInfo::runtime_call_type:
2163 case relocInfo::runtime_call_w_cp_type: {
2164 address destination = iter.reloc()->value();
2165 // Right now there is no way to find out which entries support
2166 // an interrupt point. It would be nice if we had this
2167 // information in a table.
2168 break;
2169 }
2170 default:
2171 break;
2172 }
2173 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2174 }
2175 }
2176
2177
2178 // -----------------------------------------------------------------------------
2179 // Non-product code
2180 #ifndef PRODUCT
2181
2182 class DebugScavengeRoot: public OopClosure {
2183 nmethod* _nm;
2184 bool _ok;
2185 public:
2186 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2187 bool ok() { return _ok; }
2188 virtual void do_oop(oop* p) {
2189 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2190 if (_ok) {
2191 _nm->print_nmethod(true);
2192 _ok = false;
2193 }
2194 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2195 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2196 (*p)->print();
2197 }
2198 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2199 };
2200
2201 void nmethod::verify_scavenge_root_oops() {
2202 if (!on_scavenge_root_list()) {
2203 // Actually look inside, to verify the claim that it's clean.
2204 DebugScavengeRoot debug_scavenge_root(this);
2205 oops_do(&debug_scavenge_root);
2206 if (!debug_scavenge_root.ok())
2207 fatal("found an unadvertised bad scavengable oop in the code cache");
2208 }
2209 assert(scavenge_root_not_marked(), "");
2210 }
2211
2212 #endif // PRODUCT
2213
2214 // Printing operations
2215
2216 void nmethod::print() const {
2217 ResourceMark rm;
2218 ttyLocker ttyl; // keep the following output all in one block
2219
2220 tty->print("Compiled method ");
2221
2222 if (is_compiled_by_c1()) {
2223 tty->print("(c1) ");
2224 } else if (is_compiled_by_c2()) {
2225 tty->print("(c2) ");
2226 } else if (is_compiled_by_jvmci()) {
2227 tty->print("(JVMCI) ");
2228 } else {
2229 tty->print("(nm) ");
2230 }
2231
2232 print_on(tty, NULL);
2233
2234 if (WizardMode) {
2235 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2236 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2237 tty->print(" { ");
2238 tty->print_cr("%s ", state());
2239 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2240 tty->print_cr("}:");
2241 }
2242 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2243 p2i(this),
2244 p2i(this) + size(),
2245 size());
2246 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2247 p2i(relocation_begin()),
2248 p2i(relocation_end()),
2249 relocation_size());
2250 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2251 p2i(consts_begin()),
2252 p2i(consts_end()),
2253 consts_size());
2254 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2255 p2i(insts_begin()),
2256 p2i(insts_end()),
2257 insts_size());
2258 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2259 p2i(stub_begin()),
2260 p2i(stub_end()),
2261 stub_size());
2262 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2263 p2i(oops_begin()),
2264 p2i(oops_end()),
2265 oops_size());
2266 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2267 p2i(metadata_begin()),
2268 p2i(metadata_end()),
2269 metadata_size());
2270 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2271 p2i(scopes_data_begin()),
2272 p2i(scopes_data_end()),
2273 scopes_data_size());
2274 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2275 p2i(scopes_pcs_begin()),
2276 p2i(scopes_pcs_end()),
2277 scopes_pcs_size());
2278 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2279 p2i(dependencies_begin()),
2280 p2i(dependencies_end()),
2281 dependencies_size());
2282 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2283 p2i(handler_table_begin()),
2284 p2i(handler_table_end()),
2285 handler_table_size());
2286 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2287 p2i(nul_chk_table_begin()),
2288 p2i(nul_chk_table_end()),
2289 nul_chk_table_size());
2290 }
2291
2292 #ifndef PRODUCT
2293
2294 void nmethod::print_scopes() {
2295 // Find the first pc desc for all scopes in the code and print it.
2296 ResourceMark rm;
2297 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2298 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2299 continue;
2300
2301 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2302 while (sd != NULL) {
2303 sd->print_on(tty, p);
2304 sd = sd->sender();
2305 }
2306 }
2307 }
2308
2309 void nmethod::print_dependencies() {
2310 ResourceMark rm;
2311 ttyLocker ttyl; // keep the following output all in one block
2312 tty->print_cr("Dependencies:");
2313 for (Dependencies::DepStream deps(this); deps.next(); ) {
2314 deps.print_dependency();
2315 Klass* ctxk = deps.context_type();
2316 if (ctxk != NULL) {
2317 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2318 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2319 }
2320 }
2321 deps.log_dependency(); // put it into the xml log also
2322 }
2323 }
2324
2325
2326 void nmethod::print_relocations() {
2327 ResourceMark m; // in case methods get printed via the debugger
2328 tty->print_cr("relocations:");
2329 RelocIterator iter(this);
2330 iter.print();
2331 }
2332
2333
2334 void nmethod::print_pcs() {
2335 ResourceMark m; // in case methods get printed via debugger
2336 tty->print_cr("pc-bytecode offsets:");
2337 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2338 p->print(this);
2339 }
2340 }
2341
2342 void nmethod::print_recorded_oops() {
2343 tty->print_cr("Recorded oops:");
2344 for (int i = 0; i < oops_count(); i++) {
2345 oop o = oop_at(i);
2346 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2347 if (o == (oop)Universe::non_oop_word()) {
2348 tty->print("non-oop word");
2349 } else {
2350 o->print_value();
2351 }
2352 tty->cr();
2353 }
2354 }
2355
2356 void nmethod::print_recorded_metadata() {
2357 tty->print_cr("Recorded metadata:");
2358 for (int i = 0; i < metadata_count(); i++) {
2359 Metadata* m = metadata_at(i);
2360 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2361 if (m == (Metadata*)Universe::non_oop_word()) {
2362 tty->print("non-metadata word");
2363 } else {
2364 m->print_value_on_maybe_null(tty);
2365 }
2366 tty->cr();
2367 }
2368 }
2369
2370 #endif // PRODUCT
2371
2372 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2373 RelocIterator iter(this, begin, end);
2374 bool have_one = false;
2375 while (iter.next()) {
2376 have_one = true;
2377 switch (iter.type()) {
2378 case relocInfo::none: return "no_reloc";
2379 case relocInfo::oop_type: {
2380 stringStream st;
2381 oop_Relocation* r = iter.oop_reloc();
2382 oop obj = r->oop_value();
2383 st.print("oop(");
2384 if (obj == NULL) st.print("NULL");
2385 else obj->print_value_on(&st);
2386 st.print(")");
2387 return st.as_string();
2388 }
2389 case relocInfo::metadata_type: {
2390 stringStream st;
2391 metadata_Relocation* r = iter.metadata_reloc();
2392 Metadata* obj = r->metadata_value();
2393 st.print("metadata(");
2394 if (obj == NULL) st.print("NULL");
2395 else obj->print_value_on(&st);
2396 st.print(")");
2397 return st.as_string();
2398 }
2399 case relocInfo::runtime_call_type:
2400 case relocInfo::runtime_call_w_cp_type: {
2401 stringStream st;
2402 st.print("runtime_call");
2403 CallRelocation* r = (CallRelocation*)iter.reloc();
2404 address dest = r->destination();
2405 CodeBlob* cb = CodeCache::find_blob(dest);
2406 if (cb != NULL) {
2407 st.print(" %s", cb->name());
2408 } else {
2409 ResourceMark rm;
2410 const int buflen = 1024;
2411 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2412 int offset;
2413 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2414 st.print(" %s", buf);
2415 if (offset != 0) {
2416 st.print("+%d", offset);
2417 }
2418 }
2419 }
2420 return st.as_string();
2421 }
2422 case relocInfo::virtual_call_type: {
2423 stringStream st;
2424 st.print_raw("virtual_call");
2425 virtual_call_Relocation* r = iter.virtual_call_reloc();
2426 Method* m = r->method_value();
2427 if (m != NULL) {
2428 assert(m->is_method(), "");
2429 m->print_short_name(&st);
2430 }
2431 return st.as_string();
2432 }
2433 case relocInfo::opt_virtual_call_type: {
2434 stringStream st;
2435 st.print_raw("optimized virtual_call");
2436 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2437 Method* m = r->method_value();
2438 if (m != NULL) {
2439 assert(m->is_method(), "");
2440 m->print_short_name(&st);
2441 }
2442 return st.as_string();
2443 }
2444 case relocInfo::static_call_type: {
2445 stringStream st;
2446 st.print_raw("static_call");
2447 static_call_Relocation* r = iter.static_call_reloc();
2448 Method* m = r->method_value();
2449 if (m != NULL) {
2450 assert(m->is_method(), "");
2451 m->print_short_name(&st);
2452 }
2453 return st.as_string();
2454 }
2455 case relocInfo::static_stub_type: return "static_stub";
2456 case relocInfo::external_word_type: return "external_word";
2457 case relocInfo::internal_word_type: return "internal_word";
2458 case relocInfo::section_word_type: return "section_word";
2459 case relocInfo::poll_type: return "poll";
2460 case relocInfo::poll_return_type: return "poll_return";
2461 case relocInfo::type_mask: return "type_bit_mask";
2462
2463 default:
2464 break;
2465 }
2466 }
2467 return have_one ? "other" : NULL;
2468 }
2469
2470 // Return a the last scope in (begin..end]
2471 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2472 PcDesc* p = pc_desc_near(begin+1);
2473 if (p != NULL && p->real_pc(this) <= end) {
2474 return new ScopeDesc(this, p->scope_decode_offset(),
2475 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2476 p->return_oop());
2477 }
2478 return NULL;
2479 }
2480
2481 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2482 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2483 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2484 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2485 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2486 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2487
2488 if (has_method_handle_invokes())
2489 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2490
2491 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2492
2493 if (block_begin == entry_point()) {
2494 methodHandle m = method();
2495 if (m.not_null()) {
2496 stream->print(" # ");
2497 m->print_value_on(stream);
2498 stream->cr();
2499 }
2500 if (m.not_null() && !is_osr_method()) {
2501 ResourceMark rm;
2502 int sizeargs = m->size_of_parameters();
2503 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2504 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2505 {
2506 int sig_index = 0;
2507 if (!m->is_static())
2508 sig_bt[sig_index++] = T_OBJECT; // 'this'
2509 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2510 BasicType t = ss.type();
2511 sig_bt[sig_index++] = t;
2512 if (type2size[t] == 2) {
2513 sig_bt[sig_index++] = T_VOID;
2514 } else {
2515 assert(type2size[t] == 1, "size is 1 or 2");
2516 }
2517 }
2518 assert(sig_index == sizeargs, "");
2519 }
2520 const char* spname = "sp"; // make arch-specific?
2521 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2522 int stack_slot_offset = this->frame_size() * wordSize;
2523 int tab1 = 14, tab2 = 24;
2524 int sig_index = 0;
2525 int arg_index = (m->is_static() ? 0 : -1);
2526 bool did_old_sp = false;
2527 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2528 bool at_this = (arg_index == -1);
2529 bool at_old_sp = false;
2530 BasicType t = (at_this ? T_OBJECT : ss.type());
2531 assert(t == sig_bt[sig_index], "sigs in sync");
2532 if (at_this)
2533 stream->print(" # this: ");
2534 else
2535 stream->print(" # parm%d: ", arg_index);
2536 stream->move_to(tab1);
2537 VMReg fst = regs[sig_index].first();
2538 VMReg snd = regs[sig_index].second();
2539 if (fst->is_reg()) {
2540 stream->print("%s", fst->name());
2541 if (snd->is_valid()) {
2542 stream->print(":%s", snd->name());
2543 }
2544 } else if (fst->is_stack()) {
2545 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2546 if (offset == stack_slot_offset) at_old_sp = true;
2547 stream->print("[%s+0x%x]", spname, offset);
2548 } else {
2549 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2550 }
2551 stream->print(" ");
2552 stream->move_to(tab2);
2553 stream->print("= ");
2554 if (at_this) {
2555 m->method_holder()->print_value_on(stream);
2556 } else {
2557 bool did_name = false;
2558 if (!at_this && ss.is_object()) {
2559 Symbol* name = ss.as_symbol_or_null();
2560 if (name != NULL) {
2561 name->print_value_on(stream);
2562 did_name = true;
2563 }
2564 }
2565 if (!did_name)
2566 stream->print("%s", type2name(t));
2567 }
2568 if (at_old_sp) {
2569 stream->print(" (%s of caller)", spname);
2570 did_old_sp = true;
2571 }
2572 stream->cr();
2573 sig_index += type2size[t];
2574 arg_index += 1;
2575 if (!at_this) ss.next();
2576 }
2577 if (!did_old_sp) {
2578 stream->print(" # ");
2579 stream->move_to(tab1);
2580 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2581 stream->print(" (%s of caller)", spname);
2582 stream->cr();
2583 }
2584 }
2585 }
2586 }
2587
2588 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2589 // First, find an oopmap in (begin, end].
2590 // We use the odd half-closed interval so that oop maps and scope descs
2591 // which are tied to the byte after a call are printed with the call itself.
2592 address base = code_begin();
2593 ImmutableOopMapSet* oms = oop_maps();
2594 if (oms != NULL) {
2595 for (int i = 0, imax = oms->count(); i < imax; i++) {
2596 const ImmutableOopMapPair* pair = oms->pair_at(i);
2597 const ImmutableOopMap* om = pair->get_from(oms);
2598 address pc = base + pair->pc_offset();
2599 if (pc > begin) {
2600 if (pc <= end) {
2601 st->move_to(column);
2602 st->print("; ");
2603 om->print_on(st);
2604 }
2605 break;
2606 }
2607 }
2608 }
2609
2610 // Print any debug info present at this pc.
2611 ScopeDesc* sd = scope_desc_in(begin, end);
2612 if (sd != NULL) {
2613 st->move_to(column);
2614 if (sd->bci() == SynchronizationEntryBCI) {
2615 st->print(";*synchronization entry");
2616 } else {
2617 if (sd->method() == NULL) {
2618 st->print("method is NULL");
2619 } else if (sd->method()->is_native()) {
2620 st->print("method is native");
2621 } else {
2622 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2623 st->print(";*%s", Bytecodes::name(bc));
2624 switch (bc) {
2625 case Bytecodes::_invokevirtual:
2626 case Bytecodes::_invokespecial:
2627 case Bytecodes::_invokestatic:
2628 case Bytecodes::_invokeinterface:
2629 {
2630 Bytecode_invoke invoke(sd->method(), sd->bci());
2631 st->print(" ");
2632 if (invoke.name() != NULL)
2633 invoke.name()->print_symbol_on(st);
2634 else
2635 st->print("<UNKNOWN>");
2636 break;
2637 }
2638 case Bytecodes::_getfield:
2639 case Bytecodes::_putfield:
2640 case Bytecodes::_getstatic:
2641 case Bytecodes::_putstatic:
2642 {
2643 Bytecode_field field(sd->method(), sd->bci());
2644 st->print(" ");
2645 if (field.name() != NULL)
2646 field.name()->print_symbol_on(st);
2647 else
2648 st->print("<UNKNOWN>");
2649 }
2650 default:
2651 break;
2652 }
2653 }
2654 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2655 }
2656
2657 // Print all scopes
2658 for (;sd != NULL; sd = sd->sender()) {
2659 st->move_to(column);
2660 st->print("; -");
2661 if (sd->method() == NULL) {
2662 st->print("method is NULL");
2663 } else {
2664 sd->method()->print_short_name(st);
2665 }
2666 int lineno = sd->method()->line_number_from_bci(sd->bci());
2667 if (lineno != -1) {
2668 st->print("@%d (line %d)", sd->bci(), lineno);
2669 } else {
2670 st->print("@%d", sd->bci());
2671 }
2672 st->cr();
2673 }
2674 }
2675
2676 // Print relocation information
2677 const char* str = reloc_string_for(begin, end);
2678 if (str != NULL) {
2679 if (sd != NULL) st->cr();
2680 st->move_to(column);
2681 st->print("; {%s}", str);
2682 }
2683 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2684 if (cont_offset != 0) {
2685 st->move_to(column);
2686 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2687 }
2688
2689 }
2690
2691 class DirectNativeCallWrapper: public NativeCallWrapper {
2692 private:
2693 NativeCall* _call;
2694
2695 public:
2696 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2697
2698 virtual address destination() const { return _call->destination(); }
2699 virtual address instruction_address() const { return _call->instruction_address(); }
2700 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2701 virtual address return_address() const { return _call->return_address(); }
2702
2703 virtual address get_resolve_call_stub(bool is_optimized) const {
2704 if (is_optimized) {
2705 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2706 }
2707 return SharedRuntime::get_resolve_virtual_call_stub();
2708 }
2709
2710 virtual void set_destination_mt_safe(address dest) {
2711 #if INCLUDE_AOT
2712 if (UseAOT) {
2713 CodeBlob* callee = CodeCache::find_blob(dest);
2714 CompiledMethod* cm = callee->as_compiled_method_or_null();
2715 if (cm != NULL && cm->is_far_code()) {
2716 // Temporary fix, see JDK-8143106
2717 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2718 csc->set_to_far(methodHandle(cm->method()), dest);
2719 return;
2720 }
2721 }
2722 #endif
2723 _call->set_destination_mt_safe(dest);
2724 }
2725
2726 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2727 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2728 #if INCLUDE_AOT
2729 if (info.to_aot()) {
2730 csc->set_to_far(method, info.entry());
2731 } else
2732 #endif
2733 {
2734 csc->set_to_interpreted(method, info.entry());
2735 }
2736 }
2737
2738 virtual void verify() const {
2739 // make sure code pattern is actually a call imm32 instruction
2740 _call->verify();
2741 if (os::is_MP()) {
2742 _call->verify_alignment();
2743 }
2744 }
2745
2746 virtual void verify_resolve_call(address dest) const {
2747 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2748 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2749 }
2750
2751 virtual bool is_call_to_interpreted(address dest) const {
2752 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2753 return cb->contains(dest);
2754 }
2755
2756 virtual bool is_safe_for_patching() const { return false; }
2757
2758 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2759 return nativeMovConstReg_at(r->cached_value());
2760 }
2761
2762 virtual void *get_data(NativeInstruction* instruction) const {
2763 return (void*)((NativeMovConstReg*) instruction)->data();
2764 }
2765
2766 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2767 ((NativeMovConstReg*) instruction)->set_data(data);
2768 }
2769 };
2770
2771 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2772 return new DirectNativeCallWrapper((NativeCall*) call);
2773 }
2774
2775 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2776 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2777 }
2778
2779 address nmethod::call_instruction_address(address pc) const {
2780 if (NativeCall::is_call_before(pc)) {
2781 NativeCall *ncall = nativeCall_before(pc);
2782 return ncall->instruction_address();
2783 }
2784 return NULL;
2785 }
2786
2787 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2788 return CompiledDirectStaticCall::at(call_site);
2789 }
2790
2791 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2792 return CompiledDirectStaticCall::at(call_site);
2793 }
2794
2795 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2796 return CompiledDirectStaticCall::before(return_addr);
2797 }
2798
2799 #ifndef PRODUCT
2800
2801 void nmethod::print_value_on(outputStream* st) const {
2802 st->print("nmethod");
2803 print_on(st, NULL);
2804 }
2805
2806 void nmethod::print_calls(outputStream* st) {
2807 RelocIterator iter(this);
2808 while (iter.next()) {
2809 switch (iter.type()) {
2810 case relocInfo::virtual_call_type:
2811 case relocInfo::opt_virtual_call_type: {
2812 VerifyMutexLocker mc(CompiledIC_lock);
2813 CompiledIC_at(&iter)->print();
2814 break;
2815 }
2816 case relocInfo::static_call_type:
2817 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2818 CompiledDirectStaticCall::at(iter.reloc())->print();
2819 break;
2820 default:
2821 break;
2822 }
2823 }
2824 }
2825
2826 void nmethod::print_handler_table() {
2827 ExceptionHandlerTable(this).print();
2828 }
2829
2830 void nmethod::print_nul_chk_table() {
2831 ImplicitExceptionTable(this).print(code_begin());
2832 }
2833
2834 void nmethod::print_statistics() {
2835 ttyLocker ttyl;
2836 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2837 native_nmethod_stats.print_native_nmethod_stats();
2838 #ifdef COMPILER1
2839 c1_java_nmethod_stats.print_nmethod_stats("C1");
2840 #endif
2841 #ifdef COMPILER2
2842 c2_java_nmethod_stats.print_nmethod_stats("C2");
2843 #endif
2844 #if INCLUDE_JVMCI
2845 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2846 #endif
2847 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2848 DebugInformationRecorder::print_statistics();
2849 #ifndef PRODUCT
2850 pc_nmethod_stats.print_pc_stats();
2851 #endif
2852 Dependencies::print_statistics();
2853 if (xtty != NULL) xtty->tail("statistics");
2854 }
2855
2856 #endif // !PRODUCT
2857
2858 #if INCLUDE_JVMCI
2859 void nmethod::clear_jvmci_installed_code() {
2860 assert_locked_or_safepoint(Patching_lock);
2861 if (_jvmci_installed_code != NULL) {
2862 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2863 _jvmci_installed_code = NULL;
2864 }
2865 }
2866
2867 void nmethod::clear_speculation_log() {
2868 assert_locked_or_safepoint(Patching_lock);
2869 if (_speculation_log != NULL) {
2870 JNIHandles::destroy_weak_global(_speculation_log);
2871 _speculation_log = NULL;
2872 }
2873 }
2874
2875 void nmethod::maybe_invalidate_installed_code() {
2876 assert(Patching_lock->is_locked() ||
2877 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2878 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2879 if (installed_code != NULL) {
2880 // Update the values in the InstalledCode instance if it still refers to this nmethod
2881 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2882 if (nm == this) {
2883 if (!is_alive()) {
2884 // Break the link between nmethod and InstalledCode such that the nmethod
2885 // can subsequently be flushed safely. The link must be maintained while
2886 // the method could have live activations since invalidateInstalledCode
2887 // might want to invalidate all existing activations.
2888 InstalledCode::set_address(installed_code, 0);
2889 InstalledCode::set_entryPoint(installed_code, 0);
2890 } else if (is_not_entrant()) {
2891 // Remove the entry point so any invocation will fail but keep
2892 // the address link around that so that existing activations can
2893 // be invalidated.
2894 InstalledCode::set_entryPoint(installed_code, 0);
2895 }
2896 }
2897 }
2898 if (!is_alive()) {
2899 // Clear these out after the nmethod has been unregistered and any
2900 // updates to the InstalledCode instance have been performed.
2901 clear_jvmci_installed_code();
2902 clear_speculation_log();
2903 }
2904 }
2905
2906 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2907 if (installedCode() == NULL) {
2908 THROW(vmSymbols::java_lang_NullPointerException());
2909 }
2910 jlong nativeMethod = InstalledCode::address(installedCode);
2911 nmethod* nm = (nmethod*)nativeMethod;
2912 if (nm == NULL) {
2913 // Nothing to do
2914 return;
2915 }
2916
2917 nmethodLocker nml(nm);
2918 #ifdef ASSERT
2919 {
2920 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2921 // This relationship can only be checked safely under a lock
2922 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2923 }
2924 #endif
2925
2926 if (nm->is_alive()) {
2927 // Invalidating the InstalledCode means we want the nmethod
2928 // to be deoptimized.
2929 nm->mark_for_deoptimization();
2930 VM_Deoptimize op;
2931 VMThread::execute(&op);
2932 }
2933
2934 // Multiple threads could reach this point so we now need to
2935 // lock and re-check the link to the nmethod so that only one
2936 // thread clears it.
2937 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2938 if (InstalledCode::address(installedCode) == nativeMethod) {
2939 InstalledCode::set_address(installedCode, 0);
2940 }
2941 }
2942
2943 oop nmethod::jvmci_installed_code() {
2944 return JNIHandles::resolve(_jvmci_installed_code);
2945 }
2946
2947 oop nmethod::speculation_log() {
2948 return JNIHandles::resolve(_speculation_log);
2949 }
2950
2951 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2952 if (!this->is_compiled_by_jvmci()) {
2953 return NULL;
2954 }
2955 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2956 if (installed_code != NULL) {
2957 oop installed_code_name = NULL;
2958 if (installed_code->is_a(InstalledCode::klass())) {
2959 installed_code_name = InstalledCode::name(installed_code);
2960 }
2961 if (installed_code_name != NULL) {
2962 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2963 }
2964 }
2965 return NULL;
2966 }
2967 #endif