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