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