1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "gc/shared/gcLocker.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiImpl.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/frame.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/jniHandles.inline.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/os.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/sweeper.hpp"
58 #include "runtime/vmThread.hpp"
59 #include "utilities/align.hpp"
60 #include "utilities/dtrace.hpp"
61 #include "utilities/events.hpp"
62 #include "utilities/resourceHash.hpp"
63 #include "utilities/xmlstream.hpp"
64 #if INCLUDE_JVMCI
65 #include "jvmci/jvmciJavaClasses.hpp"
66 #endif
67
68 #ifdef DTRACE_ENABLED
69
70 // Only bother with this argument setup if dtrace is available
71
72 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
73 { \
74 Method* m = (method); \
75 if (m != NULL) { \
76 Symbol* klass_name = m->klass_name(); \
77 Symbol* name = m->name(); \
78 Symbol* signature = m->signature(); \
79 HOTSPOT_COMPILED_METHOD_UNLOAD( \
80 (char *) klass_name->bytes(), klass_name->utf8_length(), \
81 (char *) name->bytes(), name->utf8_length(), \
82 (char *) signature->bytes(), signature->utf8_length()); \
83 } \
84 }
85
86 #else // ndef DTRACE_ENABLED
87
88 #define DTRACE_METHOD_UNLOAD_PROBE(method)
89
90 #endif
91
92 //---------------------------------------------------------------------------------
93 // NMethod statistics
94 // They are printed under various flags, including:
95 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
96 // (In the latter two cases, they like other stats are printed to the log only.)
97
98 #ifndef PRODUCT
99 // These variables are put into one block to reduce relocations
100 // and make it simpler to print from the debugger.
101 struct java_nmethod_stats_struct {
102 int nmethod_count;
103 int total_size;
104 int relocation_size;
105 int consts_size;
106 int insts_size;
107 int stub_size;
108 int scopes_data_size;
109 int scopes_pcs_size;
110 int dependencies_size;
111 int handler_table_size;
112 int nul_chk_table_size;
113 int oops_size;
114 int metadata_size;
115
116 void note_nmethod(nmethod* nm) {
117 nmethod_count += 1;
118 total_size += nm->size();
119 relocation_size += nm->relocation_size();
120 consts_size += nm->consts_size();
121 insts_size += nm->insts_size();
122 stub_size += nm->stub_size();
123 oops_size += nm->oops_size();
124 metadata_size += nm->metadata_size();
125 scopes_data_size += nm->scopes_data_size();
126 scopes_pcs_size += nm->scopes_pcs_size();
127 dependencies_size += nm->dependencies_size();
128 handler_table_size += nm->handler_table_size();
129 nul_chk_table_size += nm->nul_chk_table_size();
130 }
131 void print_nmethod_stats(const char* name) {
132 if (nmethod_count == 0) return;
133 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
134 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
135 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
136 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
137 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
138 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
139 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
140 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
141 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
142 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
143 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
144 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
145 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
146 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
147 }
148 };
149
150 struct native_nmethod_stats_struct {
151 int native_nmethod_count;
152 int native_total_size;
153 int native_relocation_size;
154 int native_insts_size;
155 int native_oops_size;
156 int native_metadata_size;
157 void note_native_nmethod(nmethod* nm) {
158 native_nmethod_count += 1;
159 native_total_size += nm->size();
160 native_relocation_size += nm->relocation_size();
161 native_insts_size += nm->insts_size();
162 native_oops_size += nm->oops_size();
163 native_metadata_size += nm->metadata_size();
164 }
165 void print_native_nmethod_stats() {
166 if (native_nmethod_count == 0) return;
167 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
168 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
169 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
170 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
171 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
172 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
173 }
174 };
175
176 struct pc_nmethod_stats_struct {
177 int pc_desc_resets; // number of resets (= number of caches)
178 int pc_desc_queries; // queries to nmethod::find_pc_desc
179 int pc_desc_approx; // number of those which have approximate true
180 int pc_desc_repeats; // number of _pc_descs[0] hits
181 int pc_desc_hits; // number of LRU cache hits
182 int pc_desc_tests; // total number of PcDesc examinations
183 int pc_desc_searches; // total number of quasi-binary search steps
184 int pc_desc_adds; // number of LUR cache insertions
185
186 void print_pc_stats() {
187 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
188 pc_desc_queries,
189 (double)(pc_desc_tests + pc_desc_searches)
190 / pc_desc_queries);
191 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
192 pc_desc_resets,
193 pc_desc_queries, pc_desc_approx,
194 pc_desc_repeats, pc_desc_hits,
195 pc_desc_tests, pc_desc_searches, pc_desc_adds);
196 }
197 };
198
199 #ifdef COMPILER1
200 static java_nmethod_stats_struct c1_java_nmethod_stats;
201 #endif
202 #ifdef COMPILER2
203 static java_nmethod_stats_struct c2_java_nmethod_stats;
204 #endif
205 #if INCLUDE_JVMCI
206 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
207 #endif
208 static java_nmethod_stats_struct unknown_java_nmethod_stats;
209
210 static native_nmethod_stats_struct native_nmethod_stats;
211 static pc_nmethod_stats_struct pc_nmethod_stats;
212
213 static void note_java_nmethod(nmethod* nm) {
214 #ifdef COMPILER1
215 if (nm->is_compiled_by_c1()) {
216 c1_java_nmethod_stats.note_nmethod(nm);
217 } else
218 #endif
219 #ifdef COMPILER2
220 if (nm->is_compiled_by_c2()) {
221 c2_java_nmethod_stats.note_nmethod(nm);
222 } else
223 #endif
224 #if INCLUDE_JVMCI
225 if (nm->is_compiled_by_jvmci()) {
226 jvmci_java_nmethod_stats.note_nmethod(nm);
227 } else
228 #endif
229 {
230 unknown_java_nmethod_stats.note_nmethod(nm);
231 }
232 }
233 #endif // !PRODUCT
234
235 //---------------------------------------------------------------------------------
236
237
238 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
239 assert(pc != NULL, "Must be non null");
240 assert(exception.not_null(), "Must be non null");
241 assert(handler != NULL, "Must be non null");
242
243 _count = 0;
244 _exception_type = exception->klass();
245 _next = NULL;
246
247 add_address_and_handler(pc,handler);
248 }
249
250
251 address ExceptionCache::match(Handle exception, address pc) {
252 assert(pc != NULL,"Must be non null");
253 assert(exception.not_null(),"Must be non null");
254 if (exception->klass() == exception_type()) {
255 return (test_address(pc));
256 }
257
258 return NULL;
259 }
260
261
262 bool ExceptionCache::match_exception_with_space(Handle exception) {
263 assert(exception.not_null(),"Must be non null");
264 if (exception->klass() == exception_type() && count() < cache_size) {
265 return true;
266 }
267 return false;
268 }
269
270
271 address ExceptionCache::test_address(address addr) {
272 int limit = count();
273 for (int i = 0; i < limit; i++) {
274 if (pc_at(i) == addr) {
275 return handler_at(i);
276 }
277 }
278 return NULL;
279 }
280
281
282 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
283 if (test_address(addr) == handler) return true;
284
285 int index = count();
286 if (index < cache_size) {
287 set_pc_at(index, addr);
288 set_handler_at(index, handler);
289 increment_count();
290 return true;
291 }
292 return false;
293 }
294
295 //-----------------------------------------------------------------------------
296
297
298 // Helper used by both find_pc_desc methods.
299 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
300 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
301 if (!approximate)
302 return pc->pc_offset() == pc_offset;
303 else
304 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
305 }
306
307 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
308 if (initial_pc_desc == NULL) {
309 _pc_descs[0] = NULL; // native method; no PcDescs at all
310 return;
311 }
312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
313 // reset the cache by filling it with benign (non-null) values
314 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
315 for (int i = 0; i < cache_size; i++)
316 _pc_descs[i] = initial_pc_desc;
317 }
318
319 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
320 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
321 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
322
323 // Note: one might think that caching the most recently
324 // read value separately would be a win, but one would be
325 // wrong. When many threads are updating it, the cache
326 // line it's in would bounce between caches, negating
327 // any benefit.
328
329 // In order to prevent race conditions do not load cache elements
330 // repeatedly, but use a local copy:
331 PcDesc* res;
332
333 // Step one: Check the most recently added value.
334 res = _pc_descs[0];
335 if (res == NULL) return NULL; // native method; no PcDescs at all
336 if (match_desc(res, pc_offset, approximate)) {
337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
338 return res;
339 }
340
341 // Step two: Check the rest of the LRU cache.
342 for (int i = 1; i < cache_size; ++i) {
343 res = _pc_descs[i];
344 if (res->pc_offset() < 0) break; // optimization: skip empty cache
345 if (match_desc(res, pc_offset, approximate)) {
346 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
347 return res;
348 }
349 }
350
351 // Report failure.
352 return NULL;
353 }
354
355 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
356 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
357 // Update the LRU cache by shifting pc_desc forward.
358 for (int i = 0; i < cache_size; i++) {
359 PcDesc* next = _pc_descs[i];
360 _pc_descs[i] = pc_desc;
361 pc_desc = next;
362 }
363 }
364
365 // adjust pcs_size so that it is a multiple of both oopSize and
366 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
367 // of oopSize, then 2*sizeof(PcDesc) is)
368 static int adjust_pcs_size(int pcs_size) {
369 int nsize = align_up(pcs_size, oopSize);
370 if ((nsize % sizeof(PcDesc)) != 0) {
371 nsize = pcs_size + sizeof(PcDesc);
372 }
373 assert((nsize % oopSize) == 0, "correct alignment");
374 return nsize;
375 }
376
377
378 int nmethod::total_size() const {
379 return
380 consts_size() +
381 insts_size() +
382 stub_size() +
383 scopes_data_size() +
384 scopes_pcs_size() +
385 handler_table_size() +
386 nul_chk_table_size();
387 }
388
389 address* nmethod::orig_pc_addr(const frame* fr) {
390 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
391 }
392
393 const char* nmethod::compile_kind() const {
394 if (is_osr_method()) return "osr";
395 if (method() != NULL && is_native_method()) return "c2n";
396 return NULL;
397 }
398
399 // Fill in default values for various flag fields
400 void nmethod::init_defaults() {
401 _state = not_installed;
402 _has_flushed_dependencies = 0;
403 _lock_count = 0;
404 _stack_traversal_mark = 0;
405 _unload_reported = false; // jvmti state
406 _is_far_code = false; // nmethods are located in CodeCache
407
408 #ifdef ASSERT
409 _oops_are_stale = false;
410 #endif
411
412 _oops_do_mark_link = NULL;
413 _jmethod_id = NULL;
414 _osr_link = NULL;
415 _unloading_next = NULL;
416 _scavenge_root_link = NULL;
417 _scavenge_root_state = 0;
418 #if INCLUDE_RTM_OPT
419 _rtm_state = NoRTM;
420 #endif
421 #if INCLUDE_JVMCI
422 _jvmci_installed_code = NULL;
423 _speculation_log = NULL;
424 _jvmci_installed_code_triggers_unloading = false;
425 #endif
426 }
427
428 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
429 int compile_id,
430 CodeBuffer *code_buffer,
431 int vep_offset,
432 int frame_complete,
433 int frame_size,
434 ByteSize basic_lock_owner_sp_offset,
435 ByteSize basic_lock_sp_offset,
436 OopMapSet* oop_maps) {
437 code_buffer->finalize_oop_references(method);
438 // create nmethod
439 nmethod* nm = NULL;
440 {
441 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
442 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
443 CodeOffsets offsets;
444 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
445 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
446 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
447 compile_id, &offsets,
448 code_buffer, frame_size,
449 basic_lock_owner_sp_offset,
450 basic_lock_sp_offset, oop_maps);
451 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
452 }
453
454 if (nm != NULL) {
455 // verify nmethod
456 debug_only(nm->verify();) // might block
457
458 nm->log_new_nmethod();
459 nm->make_in_use();
460 }
461 return nm;
462 }
463
464 nmethod* nmethod::new_nmethod(const methodHandle& method,
465 int compile_id,
466 int entry_bci,
467 CodeOffsets* offsets,
468 int orig_pc_offset,
469 DebugInformationRecorder* debug_info,
470 Dependencies* dependencies,
471 CodeBuffer* code_buffer, int frame_size,
472 OopMapSet* oop_maps,
473 ExceptionHandlerTable* handler_table,
474 ImplicitExceptionTable* nul_chk_table,
475 AbstractCompiler* compiler,
476 int comp_level
477 #if INCLUDE_JVMCI
478 , jweak installed_code,
479 jweak speculationLog
480 #endif
481 )
482 {
483 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
484 code_buffer->finalize_oop_references(method);
485 // create nmethod
486 nmethod* nm = NULL;
487 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
488 int nmethod_size =
489 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
490 + adjust_pcs_size(debug_info->pcs_size())
491 + align_up((int)dependencies->size_in_bytes(), oopSize)
492 + align_up(handler_table->size_in_bytes() , oopSize)
493 + align_up(nul_chk_table->size_in_bytes() , oopSize)
494 + align_up(debug_info->data_size() , oopSize);
495
496 nm = new (nmethod_size, comp_level)
497 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
498 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
499 oop_maps,
500 handler_table,
501 nul_chk_table,
502 compiler,
503 comp_level
504 #if INCLUDE_JVMCI
505 , installed_code,
506 speculationLog
507 #endif
508 );
509
510 if (nm != NULL) {
511 // To make dependency checking during class loading fast, record
512 // the nmethod dependencies in the classes it is dependent on.
513 // This allows the dependency checking code to simply walk the
514 // class hierarchy above the loaded class, checking only nmethods
515 // which are dependent on those classes. The slow way is to
516 // check every nmethod for dependencies which makes it linear in
517 // the number of methods compiled. For applications with a lot
518 // classes the slow way is too slow.
519 for (Dependencies::DepStream deps(nm); deps.next(); ) {
520 if (deps.type() == Dependencies::call_site_target_value) {
521 // CallSite dependencies are managed on per-CallSite instance basis.
522 oop call_site = deps.argument_oop(0);
523 MethodHandles::add_dependent_nmethod(call_site, nm);
524 } else {
525 Klass* klass = deps.context_type();
526 if (klass == NULL) {
527 continue; // ignore things like evol_method
528 }
529 // record this nmethod as dependent on this klass
530 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
531 }
532 }
533 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
534 }
535 }
536 // Do verification and logging outside CodeCache_lock.
537 if (nm != NULL) {
538 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
539 DEBUG_ONLY(nm->verify();)
540 nm->log_new_nmethod();
541 }
542 return nm;
543 }
544
545 // For native wrappers
546 nmethod::nmethod(
547 Method* method,
548 CompilerType type,
549 int nmethod_size,
550 int compile_id,
551 CodeOffsets* offsets,
552 CodeBuffer* code_buffer,
553 int frame_size,
554 ByteSize basic_lock_owner_sp_offset,
555 ByteSize basic_lock_sp_offset,
556 OopMapSet* oop_maps )
557 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
558 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
559 _native_basic_lock_sp_offset(basic_lock_sp_offset)
560 {
561 {
562 int scopes_data_offset = 0;
563 int deoptimize_offset = 0;
564 int deoptimize_mh_offset = 0;
565
566 debug_only(NoSafepointVerifier nsv;)
567 assert_locked_or_safepoint(CodeCache_lock);
568
569 init_defaults();
570 _entry_bci = InvocationEntryBci;
571 // We have no exception handler or deopt handler make the
572 // values something that will never match a pc like the nmethod vtable entry
573 _exception_offset = 0;
574 _orig_pc_offset = 0;
575
576 _consts_offset = data_offset();
577 _stub_offset = data_offset();
578 _oops_offset = data_offset();
579 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
580 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
581 _scopes_pcs_offset = scopes_data_offset;
582 _dependencies_offset = _scopes_pcs_offset;
583 _handler_table_offset = _dependencies_offset;
584 _nul_chk_table_offset = _handler_table_offset;
585 _nmethod_end_offset = _nul_chk_table_offset;
586 _compile_id = compile_id;
587 _comp_level = CompLevel_none;
588 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
589 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
590 _osr_entry_point = NULL;
591 _exception_cache = NULL;
592 _pc_desc_container.reset_to(NULL);
593 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
594
595 _scopes_data_begin = (address) this + scopes_data_offset;
596 _deopt_handler_begin = (address) this + deoptimize_offset;
597 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
598
599 code_buffer->copy_code_and_locs_to(this);
600 code_buffer->copy_values_to(this);
601 if (ScavengeRootsInCode) {
602 Universe::heap()->register_nmethod(this);
603 }
604 debug_only(Universe::heap()->verify_nmethod(this));
605 CodeCache::commit(this);
606 }
607
608 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
609 ttyLocker ttyl; // keep the following output all in one block
610 // This output goes directly to the tty, not the compiler log.
611 // To enable tools to match it up with the compilation activity,
612 // be sure to tag this tty output with the compile ID.
613 if (xtty != NULL) {
614 xtty->begin_head("print_native_nmethod");
615 xtty->method(_method);
616 xtty->stamp();
617 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
618 }
619 // print the header part first
620 print();
621 // then print the requested information
622 if (PrintNativeNMethods) {
623 print_code();
624 if (oop_maps != NULL) {
625 oop_maps->print();
626 }
627 }
628 if (PrintRelocations) {
629 print_relocations();
630 }
631 if (xtty != NULL) {
632 xtty->tail("print_native_nmethod");
633 }
634 }
635 }
636
637 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
638 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
639 }
640
641 nmethod::nmethod(
642 Method* method,
643 CompilerType type,
644 int nmethod_size,
645 int compile_id,
646 int entry_bci,
647 CodeOffsets* offsets,
648 int orig_pc_offset,
649 DebugInformationRecorder* debug_info,
650 Dependencies* dependencies,
651 CodeBuffer *code_buffer,
652 int frame_size,
653 OopMapSet* oop_maps,
654 ExceptionHandlerTable* handler_table,
655 ImplicitExceptionTable* nul_chk_table,
656 AbstractCompiler* compiler,
657 int comp_level
658 #if INCLUDE_JVMCI
659 , jweak installed_code,
660 jweak speculation_log
661 #endif
662 )
663 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
664 _native_receiver_sp_offset(in_ByteSize(-1)),
665 _native_basic_lock_sp_offset(in_ByteSize(-1))
666 {
667 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
668 {
669 debug_only(NoSafepointVerifier nsv;)
670 assert_locked_or_safepoint(CodeCache_lock);
671
672 _deopt_handler_begin = (address) this;
673 _deopt_mh_handler_begin = (address) this;
674
675 init_defaults();
676 _entry_bci = entry_bci;
677 _compile_id = compile_id;
678 _comp_level = comp_level;
679 _orig_pc_offset = orig_pc_offset;
680 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
681
682 // Section offsets
683 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
684 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
685 set_ctable_begin(header_begin() + _consts_offset);
686
687 #if INCLUDE_JVMCI
688 _jvmci_installed_code = installed_code;
689 _speculation_log = speculation_log;
690 oop obj = JNIHandles::resolve(installed_code);
691 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
692 _jvmci_installed_code_triggers_unloading = false;
693 } else {
694 _jvmci_installed_code_triggers_unloading = true;
695 }
696
697 if (compiler->is_jvmci()) {
698 // JVMCI might not produce any stub sections
699 if (offsets->value(CodeOffsets::Exceptions) != -1) {
700 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
701 } else {
702 _exception_offset = -1;
703 }
704 if (offsets->value(CodeOffsets::Deopt) != -1) {
705 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
706 } else {
707 _deopt_handler_begin = NULL;
708 }
709 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
710 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
711 } else {
712 _deopt_mh_handler_begin = NULL;
713 }
714 } else {
715 #endif
716 // Exception handler and deopt handler are in the stub section
717 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
718 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
719
720 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
721 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
722 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
723 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
724 } else {
725 _deopt_mh_handler_begin = NULL;
726 #if INCLUDE_JVMCI
727 }
728 #endif
729 }
730 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
731 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
732 } else {
733 _unwind_handler_offset = -1;
734 }
735
736 _oops_offset = data_offset();
737 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
738 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
739
740 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
741 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
742 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
743 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
744 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
745 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
746 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
747 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
748 _exception_cache = NULL;
749
750 _scopes_data_begin = (address) this + scopes_data_offset;
751
752 _pc_desc_container.reset_to(scopes_pcs_begin());
753
754 code_buffer->copy_code_and_locs_to(this);
755 // Copy contents of ScopeDescRecorder to nmethod
756 code_buffer->copy_values_to(this);
757 debug_info->copy_to(this);
758 dependencies->copy_to(this);
759 if (ScavengeRootsInCode) {
760 Universe::heap()->register_nmethod(this);
761 }
762 debug_only(Universe::heap()->verify_nmethod(this));
763
764 CodeCache::commit(this);
765
766 // Copy contents of ExceptionHandlerTable to nmethod
767 handler_table->copy_to(this);
768 nul_chk_table->copy_to(this);
769
770 // we use the information of entry points to find out if a method is
771 // static or non static
772 assert(compiler->is_c2() || compiler->is_jvmci() ||
773 _method->is_static() == (entry_point() == _verified_entry_point),
774 " entry points must be same for static methods and vice versa");
775 }
776 }
777
778 // Print a short set of xml attributes to identify this nmethod. The
779 // output should be embedded in some other element.
780 void nmethod::log_identity(xmlStream* log) const {
781 log->print(" compile_id='%d'", compile_id());
782 const char* nm_kind = compile_kind();
783 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
784 log->print(" compiler='%s'", compiler_name());
785 if (TieredCompilation) {
786 log->print(" level='%d'", comp_level());
787 }
788 }
789
790
791 #define LOG_OFFSET(log, name) \
792 if (p2i(name##_end()) - p2i(name##_begin())) \
793 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
794 p2i(name##_begin()) - p2i(this))
795
796
797 void nmethod::log_new_nmethod() const {
798 if (LogCompilation && xtty != NULL) {
799 ttyLocker ttyl;
800 HandleMark hm;
801 xtty->begin_elem("nmethod");
802 log_identity(xtty);
803 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
804 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
805
806 LOG_OFFSET(xtty, relocation);
807 LOG_OFFSET(xtty, consts);
808 LOG_OFFSET(xtty, insts);
809 LOG_OFFSET(xtty, stub);
810 LOG_OFFSET(xtty, scopes_data);
811 LOG_OFFSET(xtty, scopes_pcs);
812 LOG_OFFSET(xtty, dependencies);
813 LOG_OFFSET(xtty, handler_table);
814 LOG_OFFSET(xtty, nul_chk_table);
815 LOG_OFFSET(xtty, oops);
816 LOG_OFFSET(xtty, metadata);
817
818 xtty->method(method());
819 xtty->stamp();
820 xtty->end_elem();
821 }
822 }
823
824 #undef LOG_OFFSET
825
826
827 // Print out more verbose output usually for a newly created nmethod.
828 void nmethod::print_on(outputStream* st, const char* msg) const {
829 if (st != NULL) {
830 ttyLocker ttyl;
831 if (WizardMode) {
832 CompileTask::print(st, this, msg, /*short_form:*/ true);
833 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
834 } else {
835 CompileTask::print(st, this, msg, /*short_form:*/ false);
836 }
837 }
838 }
839
840 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
841 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
842 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
843 print_nmethod(printnmethods);
844 }
845 }
846
847 void nmethod::print_nmethod(bool printmethod) {
848 ttyLocker ttyl; // keep the following output all in one block
849 if (xtty != NULL) {
850 xtty->begin_head("print_nmethod");
851 xtty->stamp();
852 xtty->end_head();
853 }
854 // print the header part first
855 print();
856 // then print the requested information
857 if (printmethod) {
858 print_code();
859 print_pcs();
860 if (oop_maps()) {
861 oop_maps()->print();
862 }
863 }
864 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
865 print_scopes();
866 }
867 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
868 print_relocations();
869 }
870 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
871 print_dependencies();
872 }
873 if (printmethod || PrintExceptionHandlers) {
874 print_handler_table();
875 print_nul_chk_table();
876 }
877 if (printmethod) {
878 print_recorded_oops();
879 print_recorded_metadata();
880 }
881 if (xtty != NULL) {
882 xtty->tail("print_nmethod");
883 }
884 }
885
886
887 // Promote one word from an assembly-time handle to a live embedded oop.
888 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
889 if (handle == NULL ||
890 // As a special case, IC oops are initialized to 1 or -1.
891 handle == (jobject) Universe::non_oop_word()) {
892 (*dest) = (oop) handle;
893 } else {
894 (*dest) = JNIHandles::resolve_non_null(handle);
895 }
896 }
897
898
899 // Have to have the same name because it's called by a template
900 void nmethod::copy_values(GrowableArray<jobject>* array) {
901 int length = array->length();
902 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
903 oop* dest = oops_begin();
904 for (int index = 0 ; index < length; index++) {
905 initialize_immediate_oop(&dest[index], array->at(index));
906 }
907
908 // Now we can fix up all the oops in the code. We need to do this
909 // in the code because the assembler uses jobjects as placeholders.
910 // The code and relocations have already been initialized by the
911 // CodeBlob constructor, so it is valid even at this early point to
912 // iterate over relocations and patch the code.
913 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
914 }
915
916 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
917 int length = array->length();
918 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
919 Metadata** dest = metadata_begin();
920 for (int index = 0 ; index < length; index++) {
921 dest[index] = array->at(index);
922 }
923 }
924
925 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
926 // re-patch all oop-bearing instructions, just in case some oops moved
927 RelocIterator iter(this, begin, end);
928 while (iter.next()) {
929 if (iter.type() == relocInfo::oop_type) {
930 oop_Relocation* reloc = iter.oop_reloc();
931 if (initialize_immediates && reloc->oop_is_immediate()) {
932 oop* dest = reloc->oop_addr();
933 initialize_immediate_oop(dest, (jobject) *dest);
934 }
935 // Refresh the oop-related bits of this instruction.
936 reloc->fix_oop_relocation();
937 } else if (iter.type() == relocInfo::metadata_type) {
938 metadata_Relocation* reloc = iter.metadata_reloc();
939 reloc->fix_metadata_relocation();
940 }
941 }
942 }
943
944
945 void nmethod::verify_clean_inline_caches() {
946 assert_locked_or_safepoint(CompiledIC_lock);
947
948 // If the method is not entrant or zombie then a JMP is plastered over the
949 // first few bytes. If an oop in the old code was there, that oop
950 // should not get GC'd. Skip the first few bytes of oops on
951 // not-entrant methods.
952 address low_boundary = verified_entry_point();
953 if (!is_in_use()) {
954 low_boundary += NativeJump::instruction_size;
955 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
956 // This means that the low_boundary is going to be a little too high.
957 // This shouldn't matter, since oops of non-entrant methods are never used.
958 // In fact, why are we bothering to look at oops in a non-entrant method??
959 }
960
961 ResourceMark rm;
962 RelocIterator iter(this, low_boundary);
963 while(iter.next()) {
964 switch(iter.type()) {
965 case relocInfo::virtual_call_type:
966 case relocInfo::opt_virtual_call_type: {
967 CompiledIC *ic = CompiledIC_at(&iter);
968 // Ok, to lookup references to zombies here
969 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
970 assert(cb != NULL, "destination not in CodeBlob?");
971 nmethod* nm = cb->as_nmethod_or_null();
972 if( nm != NULL ) {
973 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
974 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
975 assert(ic->is_clean(), "IC should be clean");
976 }
977 }
978 break;
979 }
980 case relocInfo::static_call_type: {
981 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
982 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
983 assert(cb != NULL, "destination not in CodeBlob?");
984 nmethod* nm = cb->as_nmethod_or_null();
985 if( nm != NULL ) {
986 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
987 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
988 assert(csc->is_clean(), "IC should be clean");
989 }
990 }
991 break;
992 }
993 default:
994 break;
995 }
996 }
997 }
998
999 // This is a private interface with the sweeper.
1000 void nmethod::mark_as_seen_on_stack() {
1001 assert(is_alive(), "Must be an alive method");
1002 // Set the traversal mark to ensure that the sweeper does 2
1003 // cleaning passes before moving to zombie.
1004 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1005 }
1006
1007 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1008 // there are no activations on the stack, not in use by the VM,
1009 // and not in use by the ServiceThread)
1010 bool nmethod::can_convert_to_zombie() {
1011 assert(is_not_entrant(), "must be a non-entrant method");
1012
1013 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1014 // count can be greater than the stack traversal count before it hits the
1015 // nmethod for the second time.
1016 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1017 !is_locked_by_vm();
1018 }
1019
1020 void nmethod::inc_decompile_count() {
1021 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1022 // Could be gated by ProfileTraps, but do not bother...
1023 Method* m = method();
1024 if (m == NULL) return;
1025 MethodData* mdo = m->method_data();
1026 if (mdo == NULL) return;
1027 // There is a benign race here. See comments in methodData.hpp.
1028 mdo->inc_decompile_count();
1029 }
1030
1031 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1032
1033 post_compiled_method_unload();
1034
1035 // Since this nmethod is being unloaded, make sure that dependencies
1036 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1037 // indicate that this work is being done during a GC.
1038 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1039 assert(is_alive != NULL, "Should be non-NULL");
1040 // A non-NULL is_alive closure indicates that this is being called during GC.
1041 flush_dependencies(is_alive);
1042
1043 // Break cycle between nmethod & method
1044 LogTarget(Trace, class, unload) lt;
1045 if (lt.is_enabled()) {
1046 LogStream ls(lt);
1047 ls.print_cr("making nmethod " INTPTR_FORMAT
1048 " unloadable, Method*(" INTPTR_FORMAT
1049 "), cause(" INTPTR_FORMAT ")",
1050 p2i(this), p2i(_method), p2i(cause));
1051 }
1052 // Unlink the osr method, so we do not look this up again
1053 if (is_osr_method()) {
1054 // Invalidate the osr nmethod only once
1055 if (is_in_use()) {
1056 invalidate_osr_method();
1057 }
1058 #ifdef ASSERT
1059 if (method() != NULL) {
1060 // Make sure osr nmethod is invalidated, i.e. not on the list
1061 bool found = method()->method_holder()->remove_osr_nmethod(this);
1062 assert(!found, "osr nmethod should have been invalidated");
1063 }
1064 #endif
1065 }
1066
1067 // If _method is already NULL the Method* is about to be unloaded,
1068 // so we don't have to break the cycle. Note that it is possible to
1069 // have the Method* live here, in case we unload the nmethod because
1070 // it is pointing to some oop (other than the Method*) being unloaded.
1071 if (_method != NULL) {
1072 // OSR methods point to the Method*, but the Method* does not
1073 // point back!
1074 if (_method->code() == this) {
1075 _method->clear_code(); // Break a cycle
1076 }
1077 _method = NULL; // Clear the method of this dead nmethod
1078 }
1079
1080 // Make the class unloaded - i.e., change state and notify sweeper
1081 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1082 if (is_in_use()) {
1083 // Transitioning directly from live to unloaded -- so
1084 // we need to force a cache clean-up; remember this
1085 // for later on.
1086 CodeCache::set_needs_cache_clean(true);
1087 }
1088
1089 // Unregister must be done before the state change
1090 Universe::heap()->unregister_nmethod(this);
1091
1092 _state = unloaded;
1093
1094 // Log the unloading.
1095 log_state_change();
1096
1097 #if INCLUDE_JVMCI
1098 // The method can only be unloaded after the pointer to the installed code
1099 // Java wrapper is no longer alive. Here we need to clear out this weak
1100 // reference to the dead object.
1101 maybe_invalidate_installed_code();
1102 #endif
1103
1104 // The Method* is gone at this point
1105 assert(_method == NULL, "Tautology");
1106
1107 set_osr_link(NULL);
1108 NMethodSweeper::report_state_change(this);
1109 }
1110
1111 void nmethod::invalidate_osr_method() {
1112 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1113 // Remove from list of active nmethods
1114 if (method() != NULL) {
1115 method()->method_holder()->remove_osr_nmethod(this);
1116 }
1117 }
1118
1119 void nmethod::log_state_change() const {
1120 if (LogCompilation) {
1121 if (xtty != NULL) {
1122 ttyLocker ttyl; // keep the following output all in one block
1123 if (_state == unloaded) {
1124 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1125 os::current_thread_id());
1126 } else {
1127 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1128 os::current_thread_id(),
1129 (_state == zombie ? " zombie='1'" : ""));
1130 }
1131 log_identity(xtty);
1132 xtty->stamp();
1133 xtty->end_elem();
1134 }
1135 }
1136
1137 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1138 CompileTask::print_ul(this, state_msg);
1139 if (PrintCompilation && _state != unloaded) {
1140 print_on(tty, state_msg);
1141 }
1142 }
1143
1144 /**
1145 * Common functionality for both make_not_entrant and make_zombie
1146 */
1147 bool nmethod::make_not_entrant_or_zombie(int state) {
1148 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1149 assert(!is_zombie(), "should not already be a zombie");
1150
1151 if (_state == state) {
1152 // Avoid taking the lock if already in required state.
1153 // This is safe from races because the state is an end-state,
1154 // which the nmethod cannot back out of once entered.
1155 // No need for fencing either.
1156 return false;
1157 }
1158
1159 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1160 nmethodLocker nml(this);
1161 methodHandle the_method(method());
1162 NoSafepointVerifier nsv;
1163
1164 // during patching, depending on the nmethod state we must notify the GC that
1165 // code has been unloaded, unregistering it. We cannot do this right while
1166 // holding the Patching_lock because we need to use the CodeCache_lock. This
1167 // would be prone to deadlocks.
1168 // This flag is used to remember whether we need to later lock and unregister.
1169 bool nmethod_needs_unregister = false;
1170
1171 {
1172 // invalidate osr nmethod before acquiring the patching lock since
1173 // they both acquire leaf locks and we don't want a deadlock.
1174 // This logic is equivalent to the logic below for patching the
1175 // verified entry point of regular methods. We check that the
1176 // nmethod is in use to ensure that it is invalidated only once.
1177 if (is_osr_method() && is_in_use()) {
1178 // this effectively makes the osr nmethod not entrant
1179 invalidate_osr_method();
1180 }
1181
1182 // Enter critical section. Does not block for safepoint.
1183 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1184
1185 if (_state == state) {
1186 // another thread already performed this transition so nothing
1187 // to do, but return false to indicate this.
1188 return false;
1189 }
1190
1191 // The caller can be calling the method statically or through an inline
1192 // cache call.
1193 if (!is_osr_method() && !is_not_entrant()) {
1194 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1195 SharedRuntime::get_handle_wrong_method_stub());
1196 }
1197
1198 if (is_in_use() && update_recompile_counts()) {
1199 // It's a true state change, so mark the method as decompiled.
1200 // Do it only for transition from alive.
1201 inc_decompile_count();
1202 }
1203
1204 // If the state is becoming a zombie, signal to unregister the nmethod with
1205 // the heap.
1206 // This nmethod may have already been unloaded during a full GC.
1207 if ((state == zombie) && !is_unloaded()) {
1208 nmethod_needs_unregister = true;
1209 }
1210
1211 // Must happen before state change. Otherwise we have a race condition in
1212 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1213 // transition its state from 'not_entrant' to 'zombie' without having to wait
1214 // for stack scanning.
1215 if (state == not_entrant) {
1216 mark_as_seen_on_stack();
1217 OrderAccess::storestore(); // _stack_traversal_mark and _state
1218 }
1219
1220 // Change state
1221 _state = state;
1222
1223 // Log the transition once
1224 log_state_change();
1225
1226 // Invalidate while holding the patching lock
1227 JVMCI_ONLY(maybe_invalidate_installed_code());
1228
1229 // Remove nmethod from method.
1230 // We need to check if both the _code and _from_compiled_code_entry_point
1231 // refer to this nmethod because there is a race in setting these two fields
1232 // in Method* as seen in bugid 4947125.
1233 // If the vep() points to the zombie nmethod, the memory for the nmethod
1234 // could be flushed and the compiler and vtable stubs could still call
1235 // through it.
1236 if (method() != NULL && (method()->code() == this ||
1237 method()->from_compiled_entry() == verified_entry_point())) {
1238 HandleMark hm;
1239 method()->clear_code(false /* already owns Patching_lock */);
1240 }
1241 } // leave critical region under Patching_lock
1242
1243 #ifdef ASSERT
1244 if (is_osr_method() && method() != NULL) {
1245 // Make sure osr nmethod is invalidated, i.e. not on the list
1246 bool found = method()->method_holder()->remove_osr_nmethod(this);
1247 assert(!found, "osr nmethod should have been invalidated");
1248 }
1249 #endif
1250
1251 // When the nmethod becomes zombie it is no longer alive so the
1252 // dependencies must be flushed. nmethods in the not_entrant
1253 // state will be flushed later when the transition to zombie
1254 // happens or they get unloaded.
1255 if (state == zombie) {
1256 {
1257 // Flushing dependencies must be done before any possible
1258 // safepoint can sneak in, otherwise the oops used by the
1259 // dependency logic could have become stale.
1260 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1261 if (nmethod_needs_unregister) {
1262 Universe::heap()->unregister_nmethod(this);
1263 }
1264 flush_dependencies(NULL);
1265 }
1266
1267 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1268 // event and it hasn't already been reported for this nmethod then
1269 // report it now. The event may have been reported earlier if the GC
1270 // marked it for unloading). JvmtiDeferredEventQueue support means
1271 // we no longer go to a safepoint here.
1272 post_compiled_method_unload();
1273
1274 #ifdef ASSERT
1275 // It's no longer safe to access the oops section since zombie
1276 // nmethods aren't scanned for GC.
1277 _oops_are_stale = true;
1278 #endif
1279 // the Method may be reclaimed by class unloading now that the
1280 // nmethod is in zombie state
1281 set_method(NULL);
1282 } else {
1283 assert(state == not_entrant, "other cases may need to be handled differently");
1284 }
1285
1286 if (TraceCreateZombies) {
1287 ResourceMark m;
1288 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1289 }
1290
1291 NMethodSweeper::report_state_change(this);
1292 return true;
1293 }
1294
1295 void nmethod::flush() {
1296 // Note that there are no valid oops in the nmethod anymore.
1297 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1298 "osr nmethod must be unloaded or zombie before flushing");
1299 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1301 assert_locked_or_safepoint(CodeCache_lock);
1302
1303 // completely deallocate this method
1304 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1305 if (PrintMethodFlushing) {
1306 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1307 "/Free CodeCache:" SIZE_FORMAT "Kb",
1308 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1309 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1310 }
1311
1312 // We need to deallocate any ExceptionCache data.
1313 // Note that we do not need to grab the nmethod lock for this, it
1314 // better be thread safe if we're disposing of it!
1315 ExceptionCache* ec = exception_cache();
1316 set_exception_cache(NULL);
1317 while(ec != NULL) {
1318 ExceptionCache* next = ec->next();
1319 delete ec;
1320 ec = next;
1321 }
1322
1323 if (on_scavenge_root_list()) {
1324 CodeCache::drop_scavenge_root_nmethod(this);
1325 }
1326
1327 #if INCLUDE_JVMCI
1328 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1329 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1330 #endif
1331
1332 CodeBlob::flush();
1333 CodeCache::free(this);
1334 }
1335
1336 //
1337 // Notify all classes this nmethod is dependent on that it is no
1338 // longer dependent. This should only be called in two situations.
1339 // First, when a nmethod transitions to a zombie all dependents need
1340 // to be clear. Since zombification happens at a safepoint there's no
1341 // synchronization issues. The second place is a little more tricky.
1342 // During phase 1 of mark sweep class unloading may happen and as a
1343 // result some nmethods may get unloaded. In this case the flushing
1344 // of dependencies must happen during phase 1 since after GC any
1345 // dependencies in the unloaded nmethod won't be updated, so
1346 // traversing the dependency information in unsafe. In that case this
1347 // function is called with a non-NULL argument and this function only
1348 // notifies instanceKlasses that are reachable
1349
1350 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1351 assert_locked_or_safepoint(CodeCache_lock);
1352 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1353 "is_alive is non-NULL if and only if we are called during GC");
1354 if (!has_flushed_dependencies()) {
1355 set_has_flushed_dependencies();
1356 for (Dependencies::DepStream deps(this); deps.next(); ) {
1357 if (deps.type() == Dependencies::call_site_target_value) {
1358 // CallSite dependencies are managed on per-CallSite instance basis.
1359 oop call_site = deps.argument_oop(0);
1360 MethodHandles::remove_dependent_nmethod(call_site, this);
1361 } else {
1362 Klass* klass = deps.context_type();
1363 if (klass == NULL) {
1364 continue; // ignore things like evol_method
1365 }
1366 // During GC the is_alive closure is non-NULL, and is used to
1367 // determine liveness of dependees that need to be updated.
1368 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1369 // The GC defers deletion of this entry, since there might be multiple threads
1370 // iterating over the _dependencies graph. Other call paths are single-threaded
1371 // and may delete it immediately.
1372 bool delete_immediately = is_alive == NULL;
1373 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1374 }
1375 }
1376 }
1377 }
1378 }
1379
1380
1381 // If this oop is not live, the nmethod can be unloaded.
1382 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1383 assert(root != NULL, "just checking");
1384 oop obj = *root;
1385 if (obj == NULL || is_alive->do_object_b(obj)) {
1386 return false;
1387 }
1388
1389 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1390 // simply because one of its constant oops has gone dead.
1391 // No actual classes need to be unloaded in order for this to occur.
1392 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1393 make_unloaded(is_alive, obj);
1394 return true;
1395 }
1396
1397 // ------------------------------------------------------------------
1398 // post_compiled_method_load_event
1399 // new method for install_code() path
1400 // Transfer information from compilation to jvmti
1401 void nmethod::post_compiled_method_load_event() {
1402
1403 Method* moop = method();
1404 HOTSPOT_COMPILED_METHOD_LOAD(
1405 (char *) moop->klass_name()->bytes(),
1406 moop->klass_name()->utf8_length(),
1407 (char *) moop->name()->bytes(),
1408 moop->name()->utf8_length(),
1409 (char *) moop->signature()->bytes(),
1410 moop->signature()->utf8_length(),
1411 insts_begin(), insts_size());
1412
1413 if (JvmtiExport::should_post_compiled_method_load() ||
1414 JvmtiExport::should_post_compiled_method_unload()) {
1415 get_and_cache_jmethod_id();
1416 }
1417
1418 if (JvmtiExport::should_post_compiled_method_load()) {
1419 // Let the Service thread (which is a real Java thread) post the event
1420 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1421 JvmtiDeferredEventQueue::enqueue(
1422 JvmtiDeferredEvent::compiled_method_load_event(this));
1423 }
1424 }
1425
1426 jmethodID nmethod::get_and_cache_jmethod_id() {
1427 if (_jmethod_id == NULL) {
1428 // Cache the jmethod_id since it can no longer be looked up once the
1429 // method itself has been marked for unloading.
1430 _jmethod_id = method()->jmethod_id();
1431 }
1432 return _jmethod_id;
1433 }
1434
1435 void nmethod::post_compiled_method_unload() {
1436 if (unload_reported()) {
1437 // During unloading we transition to unloaded and then to zombie
1438 // and the unloading is reported during the first transition.
1439 return;
1440 }
1441
1442 assert(_method != NULL && !is_unloaded(), "just checking");
1443 DTRACE_METHOD_UNLOAD_PROBE(method());
1444
1445 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1446 // post the event. Sometime later this nmethod will be made a zombie
1447 // by the sweeper but the Method* will not be valid at that point.
1448 // If the _jmethod_id is null then no load event was ever requested
1449 // so don't bother posting the unload. The main reason for this is
1450 // that the jmethodID is a weak reference to the Method* so if
1451 // it's being unloaded there's no way to look it up since the weak
1452 // ref will have been cleared.
1453 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1454 assert(!unload_reported(), "already unloaded");
1455 JvmtiDeferredEvent event =
1456 JvmtiDeferredEvent::compiled_method_unload_event(this,
1457 _jmethod_id, insts_begin());
1458 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1459 JvmtiDeferredEventQueue::enqueue(event);
1460 }
1461
1462 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1463 // any time. As the nmethod is being unloaded now we mark it has
1464 // having the unload event reported - this will ensure that we don't
1465 // attempt to report the event in the unlikely scenario where the
1466 // event is enabled at the time the nmethod is made a zombie.
1467 set_unload_reported();
1468 }
1469
1470 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1471 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1472
1473 oop_Relocation* r = iter_at_oop->oop_reloc();
1474 // Traverse those oops directly embedded in the code.
1475 // Other oops (oop_index>0) are seen as part of scopes_oops.
1476 assert(1 == (r->oop_is_immediate()) +
1477 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1478 "oop must be found in exactly one place");
1479 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1480 // Unload this nmethod if the oop is dead.
1481 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1482 return true;;
1483 }
1484 }
1485
1486 return false;
1487 }
1488
1489 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1490 // Scopes
1491 for (oop* p = oops_begin(); p < oops_end(); p++) {
1492 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1493 if (can_unload(is_alive, p, unloading_occurred)) {
1494 return true;
1495 }
1496 }
1497 return false;
1498 }
1499
1500 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1501 // Compiled code
1502
1503 // Prevent extra code cache walk for platforms that don't have immediate oops.
1504 if (relocInfo::mustIterateImmediateOopsInCode()) {
1505 RelocIterator iter(this, low_boundary);
1506 while (iter.next()) {
1507 if (iter.type() == relocInfo::oop_type) {
1508 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1509 return true;
1510 }
1511 }
1512 }
1513 }
1514
1515 return do_unloading_scopes(is_alive, unloading_occurred);
1516 }
1517
1518 #if INCLUDE_JVMCI
1519 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1520 if (_jvmci_installed_code != NULL) {
1521 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1522 if (_jvmci_installed_code_triggers_unloading) {
1523 // jweak reference processing has already cleared the referent
1524 make_unloaded(is_alive, NULL);
1525 return true;
1526 } else {
1527 clear_jvmci_installed_code();
1528 }
1529 }
1530 }
1531 return false;
1532 }
1533 #endif
1534
1535 // Iterate over metadata calling this function. Used by RedefineClasses
1536 void nmethod::metadata_do(void f(Metadata*)) {
1537 address low_boundary = verified_entry_point();
1538 if (is_not_entrant()) {
1539 low_boundary += NativeJump::instruction_size;
1540 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1541 // (See comment above.)
1542 }
1543 {
1544 // Visit all immediate references that are embedded in the instruction stream.
1545 RelocIterator iter(this, low_boundary);
1546 while (iter.next()) {
1547 if (iter.type() == relocInfo::metadata_type ) {
1548 metadata_Relocation* r = iter.metadata_reloc();
1549 // In this metadata, we must only follow those metadatas directly embedded in
1550 // the code. Other metadatas (oop_index>0) are seen as part of
1551 // the metadata section below.
1552 assert(1 == (r->metadata_is_immediate()) +
1553 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1554 "metadata must be found in exactly one place");
1555 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1556 Metadata* md = r->metadata_value();
1557 if (md != _method) f(md);
1558 }
1559 } else if (iter.type() == relocInfo::virtual_call_type) {
1560 // Check compiledIC holders associated with this nmethod
1561 CompiledIC *ic = CompiledIC_at(&iter);
1562 if (ic->is_icholder_call()) {
1563 CompiledICHolder* cichk = ic->cached_icholder();
1564 f(cichk->holder_metadata());
1565 f(cichk->holder_klass());
1566 } else {
1567 Metadata* ic_oop = ic->cached_metadata();
1568 if (ic_oop != NULL) {
1569 f(ic_oop);
1570 }
1571 }
1572 }
1573 }
1574 }
1575
1576 // Visit the metadata section
1577 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1578 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1579 Metadata* md = *p;
1580 f(md);
1581 }
1582
1583 // Visit metadata not embedded in the other places.
1584 if (_method != NULL) f(_method);
1585 }
1586
1587 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1588 // make sure the oops ready to receive visitors
1589 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1590 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1591
1592 // If the method is not entrant or zombie then a JMP is plastered over the
1593 // first few bytes. If an oop in the old code was there, that oop
1594 // should not get GC'd. Skip the first few bytes of oops on
1595 // not-entrant methods.
1596 address low_boundary = verified_entry_point();
1597 if (is_not_entrant()) {
1598 low_boundary += NativeJump::instruction_size;
1599 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1600 // (See comment above.)
1601 }
1602
1603 // Prevent extra code cache walk for platforms that don't have immediate oops.
1604 if (relocInfo::mustIterateImmediateOopsInCode()) {
1605 RelocIterator iter(this, low_boundary);
1606
1607 while (iter.next()) {
1608 if (iter.type() == relocInfo::oop_type ) {
1609 oop_Relocation* r = iter.oop_reloc();
1610 // In this loop, we must only follow those oops directly embedded in
1611 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1612 assert(1 == (r->oop_is_immediate()) +
1613 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1614 "oop must be found in exactly one place");
1615 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1616 f->do_oop(r->oop_addr());
1617 }
1618 }
1619 }
1620 }
1621
1622 // Scopes
1623 // This includes oop constants not inlined in the code stream.
1624 for (oop* p = oops_begin(); p < oops_end(); p++) {
1625 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1626 f->do_oop(p);
1627 }
1628 }
1629
1630 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1631
1632 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1633
1634 // An nmethod is "marked" if its _mark_link is set non-null.
1635 // Even if it is the end of the linked list, it will have a non-null link value,
1636 // as long as it is on the list.
1637 // This code must be MP safe, because it is used from parallel GC passes.
1638 bool nmethod::test_set_oops_do_mark() {
1639 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1640 if (_oops_do_mark_link == NULL) {
1641 // Claim this nmethod for this thread to mark.
1642 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1643 // Atomically append this nmethod (now claimed) to the head of the list:
1644 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1645 for (;;) {
1646 nmethod* required_mark_nmethods = observed_mark_nmethods;
1647 _oops_do_mark_link = required_mark_nmethods;
1648 observed_mark_nmethods =
1649 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1650 if (observed_mark_nmethods == required_mark_nmethods)
1651 break;
1652 }
1653 // Mark was clear when we first saw this guy.
1654 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1655 return false;
1656 }
1657 }
1658 // On fall through, another racing thread marked this nmethod before we did.
1659 return true;
1660 }
1661
1662 void nmethod::oops_do_marking_prologue() {
1663 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1664 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1665 // We use cmpxchg instead of regular assignment here because the user
1666 // may fork a bunch of threads, and we need them all to see the same state.
1667 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1668 guarantee(observed == NULL, "no races in this sequential code");
1669 }
1670
1671 void nmethod::oops_do_marking_epilogue() {
1672 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1673 nmethod* cur = _oops_do_mark_nmethods;
1674 while (cur != NMETHOD_SENTINEL) {
1675 assert(cur != NULL, "not NULL-terminated");
1676 nmethod* next = cur->_oops_do_mark_link;
1677 cur->_oops_do_mark_link = NULL;
1678 DEBUG_ONLY(cur->verify_oop_relocations());
1679 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1680 cur = next;
1681 }
1682 nmethod* required = _oops_do_mark_nmethods;
1683 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1684 guarantee(observed == required, "no races in this sequential code");
1685 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1686 }
1687
1688 class DetectScavengeRoot: public OopClosure {
1689 bool _detected_scavenge_root;
1690 public:
1691 DetectScavengeRoot() : _detected_scavenge_root(false)
1692 { NOT_PRODUCT(_print_nm = NULL); }
1693 bool detected_scavenge_root() { return _detected_scavenge_root; }
1694 virtual void do_oop(oop* p) {
1695 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1696 NOT_PRODUCT(maybe_print(p));
1697 _detected_scavenge_root = true;
1698 }
1699 }
1700 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1701
1702 #ifndef PRODUCT
1703 nmethod* _print_nm;
1704 void maybe_print(oop* p) {
1705 if (_print_nm == NULL) return;
1706 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1707 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1708 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1709 p2i(*p), p2i(p));
1710 (*p)->print();
1711 }
1712 #endif //PRODUCT
1713 };
1714
1715 bool nmethod::detect_scavenge_root_oops() {
1716 DetectScavengeRoot detect_scavenge_root;
1717 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1718 oops_do(&detect_scavenge_root);
1719 return detect_scavenge_root.detected_scavenge_root();
1720 }
1721
1722 inline bool includes(void* p, void* from, void* to) {
1723 return from <= p && p < to;
1724 }
1725
1726
1727 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1728 assert(count >= 2, "must be sentinel values, at least");
1729
1730 #ifdef ASSERT
1731 // must be sorted and unique; we do a binary search in find_pc_desc()
1732 int prev_offset = pcs[0].pc_offset();
1733 assert(prev_offset == PcDesc::lower_offset_limit,
1734 "must start with a sentinel");
1735 for (int i = 1; i < count; i++) {
1736 int this_offset = pcs[i].pc_offset();
1737 assert(this_offset > prev_offset, "offsets must be sorted");
1738 prev_offset = this_offset;
1739 }
1740 assert(prev_offset == PcDesc::upper_offset_limit,
1741 "must end with a sentinel");
1742 #endif //ASSERT
1743
1744 // Search for MethodHandle invokes and tag the nmethod.
1745 for (int i = 0; i < count; i++) {
1746 if (pcs[i].is_method_handle_invoke()) {
1747 set_has_method_handle_invokes(true);
1748 break;
1749 }
1750 }
1751 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1752
1753 int size = count * sizeof(PcDesc);
1754 assert(scopes_pcs_size() >= size, "oob");
1755 memcpy(scopes_pcs_begin(), pcs, size);
1756
1757 // Adjust the final sentinel downward.
1758 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1759 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1760 last_pc->set_pc_offset(content_size() + 1);
1761 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1762 // Fill any rounding gaps with copies of the last record.
1763 last_pc[1] = last_pc[0];
1764 }
1765 // The following assert could fail if sizeof(PcDesc) is not
1766 // an integral multiple of oopSize (the rounding term).
1767 // If it fails, change the logic to always allocate a multiple
1768 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1769 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1770 }
1771
1772 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1773 assert(scopes_data_size() >= size, "oob");
1774 memcpy(scopes_data_begin(), buffer, size);
1775 }
1776
1777 #ifdef ASSERT
1778 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1779 PcDesc* lower = search.scopes_pcs_begin();
1780 PcDesc* upper = search.scopes_pcs_end();
1781 lower += 1; // exclude initial sentinel
1782 PcDesc* res = NULL;
1783 for (PcDesc* p = lower; p < upper; p++) {
1784 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1785 if (match_desc(p, pc_offset, approximate)) {
1786 if (res == NULL)
1787 res = p;
1788 else
1789 res = (PcDesc*) badAddress;
1790 }
1791 }
1792 return res;
1793 }
1794 #endif
1795
1796
1797 // Finds a PcDesc with real-pc equal to "pc"
1798 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1799 address base_address = search.code_begin();
1800 if ((pc < base_address) ||
1801 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1802 return NULL; // PC is wildly out of range
1803 }
1804 int pc_offset = (int) (pc - base_address);
1805
1806 // Check the PcDesc cache if it contains the desired PcDesc
1807 // (This as an almost 100% hit rate.)
1808 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1809 if (res != NULL) {
1810 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1811 return res;
1812 }
1813
1814 // Fallback algorithm: quasi-linear search for the PcDesc
1815 // Find the last pc_offset less than the given offset.
1816 // The successor must be the required match, if there is a match at all.
1817 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1818 PcDesc* lower = search.scopes_pcs_begin();
1819 PcDesc* upper = search.scopes_pcs_end();
1820 upper -= 1; // exclude final sentinel
1821 if (lower >= upper) return NULL; // native method; no PcDescs at all
1822
1823 #define assert_LU_OK \
1824 /* invariant on lower..upper during the following search: */ \
1825 assert(lower->pc_offset() < pc_offset, "sanity"); \
1826 assert(upper->pc_offset() >= pc_offset, "sanity")
1827 assert_LU_OK;
1828
1829 // Use the last successful return as a split point.
1830 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1831 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1832 if (mid->pc_offset() < pc_offset) {
1833 lower = mid;
1834 } else {
1835 upper = mid;
1836 }
1837
1838 // Take giant steps at first (4096, then 256, then 16, then 1)
1839 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1840 const int RADIX = (1 << LOG2_RADIX);
1841 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1842 while ((mid = lower + step) < upper) {
1843 assert_LU_OK;
1844 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1845 if (mid->pc_offset() < pc_offset) {
1846 lower = mid;
1847 } else {
1848 upper = mid;
1849 break;
1850 }
1851 }
1852 assert_LU_OK;
1853 }
1854
1855 // Sneak up on the value with a linear search of length ~16.
1856 while (true) {
1857 assert_LU_OK;
1858 mid = lower + 1;
1859 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1860 if (mid->pc_offset() < pc_offset) {
1861 lower = mid;
1862 } else {
1863 upper = mid;
1864 break;
1865 }
1866 }
1867 #undef assert_LU_OK
1868
1869 if (match_desc(upper, pc_offset, approximate)) {
1870 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1871 _pc_desc_cache.add_pc_desc(upper);
1872 return upper;
1873 } else {
1874 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1875 return NULL;
1876 }
1877 }
1878
1879
1880 void nmethod::check_all_dependencies(DepChange& changes) {
1881 // Checked dependencies are allocated into this ResourceMark
1882 ResourceMark rm;
1883
1884 // Turn off dependency tracing while actually testing dependencies.
1885 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1886
1887 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1888 &DependencySignature::equals, 11027> DepTable;
1889
1890 DepTable* table = new DepTable();
1891
1892 // Iterate over live nmethods and check dependencies of all nmethods that are not
1893 // marked for deoptimization. A particular dependency is only checked once.
1894 NMethodIterator iter;
1895 while(iter.next()) {
1896 nmethod* nm = iter.method();
1897 // Only notify for live nmethods
1898 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1899 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1900 // Construct abstraction of a dependency.
1901 DependencySignature* current_sig = new DependencySignature(deps);
1902
1903 // Determine if dependency is already checked. table->put(...) returns
1904 // 'true' if the dependency is added (i.e., was not in the hashtable).
1905 if (table->put(*current_sig, 1)) {
1906 if (deps.check_dependency() != NULL) {
1907 // Dependency checking failed. Print out information about the failed
1908 // dependency and finally fail with an assert. We can fail here, since
1909 // dependency checking is never done in a product build.
1910 tty->print_cr("Failed dependency:");
1911 changes.print();
1912 nm->print();
1913 nm->print_dependencies();
1914 assert(false, "Should have been marked for deoptimization");
1915 }
1916 }
1917 }
1918 }
1919 }
1920 }
1921
1922 bool nmethod::check_dependency_on(DepChange& changes) {
1923 // What has happened:
1924 // 1) a new class dependee has been added
1925 // 2) dependee and all its super classes have been marked
1926 bool found_check = false; // set true if we are upset
1927 for (Dependencies::DepStream deps(this); deps.next(); ) {
1928 // Evaluate only relevant dependencies.
1929 if (deps.spot_check_dependency_at(changes) != NULL) {
1930 found_check = true;
1931 NOT_DEBUG(break);
1932 }
1933 }
1934 return found_check;
1935 }
1936
1937 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1938 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1939 Array<Method*>* dependee_methods = dependee_ik->methods();
1940 for (Dependencies::DepStream deps(this); deps.next(); ) {
1941 if (deps.type() == Dependencies::evol_method) {
1942 Method* method = deps.method_argument(0);
1943 for (int j = 0; j < dependee_methods->length(); j++) {
1944 if (dependee_methods->at(j) == method) {
1945 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1946 ResourceMark rm;
1947 log_debug(redefine, class, nmethod)
1948 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1949 _method->method_holder()->external_name(),
1950 _method->name()->as_C_string(),
1951 _method->signature()->as_C_string(),
1952 compile_id(),
1953 method->method_holder()->external_name(),
1954 method->name()->as_C_string(),
1955 method->signature()->as_C_string());
1956 }
1957 if (TraceDependencies || LogCompilation)
1958 deps.log_dependency(dependee);
1959 return true;
1960 }
1961 }
1962 }
1963 }
1964 return false;
1965 }
1966
1967 // Called from mark_for_deoptimization, when dependee is invalidated.
1968 bool nmethod::is_dependent_on_method(Method* dependee) {
1969 for (Dependencies::DepStream deps(this); deps.next(); ) {
1970 if (deps.type() != Dependencies::evol_method)
1971 continue;
1972 Method* method = deps.method_argument(0);
1973 if (method == dependee) return true;
1974 }
1975 return false;
1976 }
1977
1978
1979 bool nmethod::is_patchable_at(address instr_addr) {
1980 assert(insts_contains(instr_addr), "wrong nmethod used");
1981 if (is_zombie()) {
1982 // a zombie may never be patched
1983 return false;
1984 }
1985 return true;
1986 }
1987
1988
1989 address nmethod::continuation_for_implicit_exception(address pc) {
1990 // Exception happened outside inline-cache check code => we are inside
1991 // an active nmethod => use cpc to determine a return address
1992 int exception_offset = pc - code_begin();
1993 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1994 #ifdef ASSERT
1995 if (cont_offset == 0) {
1996 Thread* thread = Thread::current();
1997 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1998 HandleMark hm(thread);
1999 ResourceMark rm(thread);
2000 CodeBlob* cb = CodeCache::find_blob(pc);
2001 assert(cb != NULL && cb == this, "");
2002 ttyLocker ttyl;
2003 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2004 print();
2005 method()->print_codes();
2006 print_code();
2007 print_pcs();
2008 }
2009 #endif
2010 if (cont_offset == 0) {
2011 // Let the normal error handling report the exception
2012 return NULL;
2013 }
2014 return code_begin() + cont_offset;
2015 }
2016
2017
2018
2019 void nmethod_init() {
2020 // make sure you didn't forget to adjust the filler fields
2021 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2022 }
2023
2024
2025 //-------------------------------------------------------------------------------------------
2026
2027
2028 // QQQ might we make this work from a frame??
2029 nmethodLocker::nmethodLocker(address pc) {
2030 CodeBlob* cb = CodeCache::find_blob(pc);
2031 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2032 _nm = cb->as_compiled_method();
2033 lock_nmethod(_nm);
2034 }
2035
2036 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2037 // should pass zombie_ok == true.
2038 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2039 if (cm == NULL) return;
2040 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2041 nmethod* nm = cm->as_nmethod();
2042 Atomic::inc(&nm->_lock_count);
2043 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2044 }
2045
2046 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2047 if (cm == NULL) return;
2048 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2049 nmethod* nm = cm->as_nmethod();
2050 Atomic::dec(&nm->_lock_count);
2051 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2052 }
2053
2054
2055 // -----------------------------------------------------------------------------
2056 // Verification
2057
2058 class VerifyOopsClosure: public OopClosure {
2059 nmethod* _nm;
2060 bool _ok;
2061 public:
2062 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2063 bool ok() { return _ok; }
2064 virtual void do_oop(oop* p) {
2065 if (oopDesc::is_oop_or_null(*p)) return;
2066 if (_ok) {
2067 _nm->print_nmethod(true);
2068 _ok = false;
2069 }
2070 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2071 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2072 }
2073 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2074 };
2075
2076 void nmethod::verify() {
2077
2078 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2079 // seems odd.
2080
2081 if (is_zombie() || is_not_entrant() || is_unloaded())
2082 return;
2083
2084 // Make sure all the entry points are correctly aligned for patching.
2085 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2086
2087 // assert(oopDesc::is_oop(method()), "must be valid");
2088
2089 ResourceMark rm;
2090
2091 if (!CodeCache::contains(this)) {
2092 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2093 }
2094
2095 if(is_native_method() )
2096 return;
2097
2098 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2099 if (nm != this) {
2100 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2101 }
2102
2103 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2104 if (! p->verify(this)) {
2105 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2106 }
2107 }
2108
2109 VerifyOopsClosure voc(this);
2110 oops_do(&voc);
2111 assert(voc.ok(), "embedded oops must be OK");
2112 Universe::heap()->verify_nmethod(this);
2113
2114 verify_scopes();
2115 }
2116
2117
2118 void nmethod::verify_interrupt_point(address call_site) {
2119 // Verify IC only when nmethod installation is finished.
2120 if (!is_not_installed()) {
2121 Thread *cur = Thread::current();
2122 if (CompiledIC_lock->owner() == cur ||
2123 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2124 SafepointSynchronize::is_at_safepoint())) {
2125 CompiledIC_at(this, call_site);
2126 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2127 } else {
2128 MutexLocker ml_verify (CompiledIC_lock);
2129 CompiledIC_at(this, call_site);
2130 }
2131 }
2132
2133 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2134 assert(pd != NULL, "PcDesc must exist");
2135 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2136 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2137 pd->return_oop());
2138 !sd->is_top(); sd = sd->sender()) {
2139 sd->verify();
2140 }
2141 }
2142
2143 void nmethod::verify_scopes() {
2144 if( !method() ) return; // Runtime stubs have no scope
2145 if (method()->is_native()) return; // Ignore stub methods.
2146 // iterate through all interrupt point
2147 // and verify the debug information is valid.
2148 RelocIterator iter((nmethod*)this);
2149 while (iter.next()) {
2150 address stub = NULL;
2151 switch (iter.type()) {
2152 case relocInfo::virtual_call_type:
2153 verify_interrupt_point(iter.addr());
2154 break;
2155 case relocInfo::opt_virtual_call_type:
2156 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2157 verify_interrupt_point(iter.addr());
2158 break;
2159 case relocInfo::static_call_type:
2160 stub = iter.static_call_reloc()->static_stub(false);
2161 //verify_interrupt_point(iter.addr());
2162 break;
2163 case relocInfo::runtime_call_type:
2164 case relocInfo::runtime_call_w_cp_type: {
2165 address destination = iter.reloc()->value();
2166 // Right now there is no way to find out which entries support
2167 // an interrupt point. It would be nice if we had this
2168 // information in a table.
2169 break;
2170 }
2171 default:
2172 break;
2173 }
2174 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2175 }
2176 }
2177
2178
2179 // -----------------------------------------------------------------------------
2180 // Non-product code
2181 #ifndef PRODUCT
2182
2183 class DebugScavengeRoot: public OopClosure {
2184 nmethod* _nm;
2185 bool _ok;
2186 public:
2187 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2188 bool ok() { return _ok; }
2189 virtual void do_oop(oop* p) {
2190 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2191 if (_ok) {
2192 _nm->print_nmethod(true);
2193 _ok = false;
2194 }
2195 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2196 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2197 (*p)->print();
2198 }
2199 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2200 };
2201
2202 void nmethod::verify_scavenge_root_oops() {
2203 if (!on_scavenge_root_list()) {
2204 // Actually look inside, to verify the claim that it's clean.
2205 DebugScavengeRoot debug_scavenge_root(this);
2206 oops_do(&debug_scavenge_root);
2207 if (!debug_scavenge_root.ok())
2208 fatal("found an unadvertised bad scavengable oop in the code cache");
2209 }
2210 assert(scavenge_root_not_marked(), "");
2211 }
2212
2213 #endif // PRODUCT
2214
2215 // Printing operations
2216
2217 void nmethod::print() const {
2218 ResourceMark rm;
2219 ttyLocker ttyl; // keep the following output all in one block
2220
2221 tty->print("Compiled method ");
2222
2223 if (is_compiled_by_c1()) {
2224 tty->print("(c1) ");
2225 } else if (is_compiled_by_c2()) {
2226 tty->print("(c2) ");
2227 } else if (is_compiled_by_jvmci()) {
2228 tty->print("(JVMCI) ");
2229 } else {
2230 tty->print("(nm) ");
2231 }
2232
2233 print_on(tty, NULL);
2234
2235 if (WizardMode) {
2236 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2237 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2238 tty->print(" { ");
2239 tty->print_cr("%s ", state());
2240 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2241 tty->print_cr("}:");
2242 }
2243 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2244 p2i(this),
2245 p2i(this) + size(),
2246 size());
2247 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2248 p2i(relocation_begin()),
2249 p2i(relocation_end()),
2250 relocation_size());
2251 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2252 p2i(consts_begin()),
2253 p2i(consts_end()),
2254 consts_size());
2255 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2256 p2i(insts_begin()),
2257 p2i(insts_end()),
2258 insts_size());
2259 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2260 p2i(stub_begin()),
2261 p2i(stub_end()),
2262 stub_size());
2263 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2264 p2i(oops_begin()),
2265 p2i(oops_end()),
2266 oops_size());
2267 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2268 p2i(metadata_begin()),
2269 p2i(metadata_end()),
2270 metadata_size());
2271 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2272 p2i(scopes_data_begin()),
2273 p2i(scopes_data_end()),
2274 scopes_data_size());
2275 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2276 p2i(scopes_pcs_begin()),
2277 p2i(scopes_pcs_end()),
2278 scopes_pcs_size());
2279 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2280 p2i(dependencies_begin()),
2281 p2i(dependencies_end()),
2282 dependencies_size());
2283 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2284 p2i(handler_table_begin()),
2285 p2i(handler_table_end()),
2286 handler_table_size());
2287 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2288 p2i(nul_chk_table_begin()),
2289 p2i(nul_chk_table_end()),
2290 nul_chk_table_size());
2291 }
2292
2293 #ifndef PRODUCT
2294
2295 void nmethod::print_scopes() {
2296 // Find the first pc desc for all scopes in the code and print it.
2297 ResourceMark rm;
2298 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2299 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2300 continue;
2301
2302 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2303 while (sd != NULL) {
2304 sd->print_on(tty, p);
2305 sd = sd->sender();
2306 }
2307 }
2308 }
2309
2310 void nmethod::print_dependencies() {
2311 ResourceMark rm;
2312 ttyLocker ttyl; // keep the following output all in one block
2313 tty->print_cr("Dependencies:");
2314 for (Dependencies::DepStream deps(this); deps.next(); ) {
2315 deps.print_dependency();
2316 Klass* ctxk = deps.context_type();
2317 if (ctxk != NULL) {
2318 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2319 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2320 }
2321 }
2322 deps.log_dependency(); // put it into the xml log also
2323 }
2324 }
2325
2326
2327 void nmethod::print_relocations() {
2328 ResourceMark m; // in case methods get printed via the debugger
2329 tty->print_cr("relocations:");
2330 RelocIterator iter(this);
2331 iter.print();
2332 }
2333
2334
2335 void nmethod::print_pcs() {
2336 ResourceMark m; // in case methods get printed via debugger
2337 tty->print_cr("pc-bytecode offsets:");
2338 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2339 p->print(this);
2340 }
2341 }
2342
2343 void nmethod::print_recorded_oops() {
2344 tty->print_cr("Recorded oops:");
2345 for (int i = 0; i < oops_count(); i++) {
2346 oop o = oop_at(i);
2347 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2348 if (o == (oop)Universe::non_oop_word()) {
2349 tty->print("non-oop word");
2350 } else {
2351 o->print_value();
2352 }
2353 tty->cr();
2354 }
2355 }
2356
2357 void nmethod::print_recorded_metadata() {
2358 tty->print_cr("Recorded metadata:");
2359 for (int i = 0; i < metadata_count(); i++) {
2360 Metadata* m = metadata_at(i);
2361 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2362 if (m == (Metadata*)Universe::non_oop_word()) {
2363 tty->print("non-metadata word");
2364 } else {
2365 m->print_value_on_maybe_null(tty);
2366 }
2367 tty->cr();
2368 }
2369 }
2370
2371 #endif // PRODUCT
2372
2373 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2374 RelocIterator iter(this, begin, end);
2375 bool have_one = false;
2376 while (iter.next()) {
2377 have_one = true;
2378 switch (iter.type()) {
2379 case relocInfo::none: return "no_reloc";
2380 case relocInfo::oop_type: {
2381 stringStream st;
2382 oop_Relocation* r = iter.oop_reloc();
2383 oop obj = r->oop_value();
2384 st.print("oop(");
2385 if (obj == NULL) st.print("NULL");
2386 else obj->print_value_on(&st);
2387 st.print(")");
2388 return st.as_string();
2389 }
2390 case relocInfo::metadata_type: {
2391 stringStream st;
2392 metadata_Relocation* r = iter.metadata_reloc();
2393 Metadata* obj = r->metadata_value();
2394 st.print("metadata(");
2395 if (obj == NULL) st.print("NULL");
2396 else obj->print_value_on(&st);
2397 st.print(")");
2398 return st.as_string();
2399 }
2400 case relocInfo::runtime_call_type:
2401 case relocInfo::runtime_call_w_cp_type: {
2402 stringStream st;
2403 st.print("runtime_call");
2404 CallRelocation* r = (CallRelocation*)iter.reloc();
2405 address dest = r->destination();
2406 CodeBlob* cb = CodeCache::find_blob(dest);
2407 if (cb != NULL) {
2408 st.print(" %s", cb->name());
2409 } else {
2410 ResourceMark rm;
2411 const int buflen = 1024;
2412 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2413 int offset;
2414 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2415 st.print(" %s", buf);
2416 if (offset != 0) {
2417 st.print("+%d", offset);
2418 }
2419 }
2420 }
2421 return st.as_string();
2422 }
2423 case relocInfo::virtual_call_type: {
2424 stringStream st;
2425 st.print_raw("virtual_call");
2426 virtual_call_Relocation* r = iter.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::opt_virtual_call_type: {
2435 stringStream st;
2436 st.print_raw("optimized virtual_call");
2437 opt_virtual_call_Relocation* r = iter.opt_virtual_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_call_type: {
2446 stringStream st;
2447 st.print_raw("static_call");
2448 static_call_Relocation* r = iter.static_call_reloc();
2449 Method* m = r->method_value();
2450 if (m != NULL) {
2451 assert(m->is_method(), "");
2452 m->print_short_name(&st);
2453 }
2454 return st.as_string();
2455 }
2456 case relocInfo::static_stub_type: return "static_stub";
2457 case relocInfo::external_word_type: return "external_word";
2458 case relocInfo::internal_word_type: return "internal_word";
2459 case relocInfo::section_word_type: return "section_word";
2460 case relocInfo::poll_type: return "poll";
2461 case relocInfo::poll_return_type: return "poll_return";
2462 case relocInfo::type_mask: return "type_bit_mask";
2463
2464 default:
2465 break;
2466 }
2467 }
2468 return have_one ? "other" : NULL;
2469 }
2470
2471 // Return a the last scope in (begin..end]
2472 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2473 PcDesc* p = pc_desc_near(begin+1);
2474 if (p != NULL && p->real_pc(this) <= end) {
2475 return new ScopeDesc(this, p->scope_decode_offset(),
2476 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2477 p->return_oop());
2478 }
2479 return NULL;
2480 }
2481
2482 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2483 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2484 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2485 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2486 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2487 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2488
2489 if (has_method_handle_invokes())
2490 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2491
2492 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2493
2494 if (block_begin == entry_point()) {
2495 methodHandle m = method();
2496 if (m.not_null()) {
2497 stream->print(" # ");
2498 m->print_value_on(stream);
2499 stream->cr();
2500 }
2501 if (m.not_null() && !is_osr_method()) {
2502 ResourceMark rm;
2503 int sizeargs = m->size_of_parameters();
2504 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2505 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2506 {
2507 int sig_index = 0;
2508 if (!m->is_static())
2509 sig_bt[sig_index++] = T_OBJECT; // 'this'
2510 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2511 BasicType t = ss.type();
2512 sig_bt[sig_index++] = t;
2513 if (type2size[t] == 2) {
2514 sig_bt[sig_index++] = T_VOID;
2515 } else {
2516 assert(type2size[t] == 1, "size is 1 or 2");
2517 }
2518 }
2519 assert(sig_index == sizeargs, "");
2520 }
2521 const char* spname = "sp"; // make arch-specific?
2522 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2523 int stack_slot_offset = this->frame_size() * wordSize;
2524 int tab1 = 14, tab2 = 24;
2525 int sig_index = 0;
2526 int arg_index = (m->is_static() ? 0 : -1);
2527 bool did_old_sp = false;
2528 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2529 bool at_this = (arg_index == -1);
2530 bool at_old_sp = false;
2531 BasicType t = (at_this ? T_OBJECT : ss.type());
2532 assert(t == sig_bt[sig_index], "sigs in sync");
2533 if (at_this)
2534 stream->print(" # this: ");
2535 else
2536 stream->print(" # parm%d: ", arg_index);
2537 stream->move_to(tab1);
2538 VMReg fst = regs[sig_index].first();
2539 VMReg snd = regs[sig_index].second();
2540 if (fst->is_reg()) {
2541 stream->print("%s", fst->name());
2542 if (snd->is_valid()) {
2543 stream->print(":%s", snd->name());
2544 }
2545 } else if (fst->is_stack()) {
2546 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2547 if (offset == stack_slot_offset) at_old_sp = true;
2548 stream->print("[%s+0x%x]", spname, offset);
2549 } else {
2550 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2551 }
2552 stream->print(" ");
2553 stream->move_to(tab2);
2554 stream->print("= ");
2555 if (at_this) {
2556 m->method_holder()->print_value_on(stream);
2557 } else {
2558 bool did_name = false;
2559 if (!at_this && ss.is_object()) {
2560 Symbol* name = ss.as_symbol_or_null();
2561 if (name != NULL) {
2562 name->print_value_on(stream);
2563 did_name = true;
2564 }
2565 }
2566 if (!did_name)
2567 stream->print("%s", type2name(t));
2568 }
2569 if (at_old_sp) {
2570 stream->print(" (%s of caller)", spname);
2571 did_old_sp = true;
2572 }
2573 stream->cr();
2574 sig_index += type2size[t];
2575 arg_index += 1;
2576 if (!at_this) ss.next();
2577 }
2578 if (!did_old_sp) {
2579 stream->print(" # ");
2580 stream->move_to(tab1);
2581 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2582 stream->print(" (%s of caller)", spname);
2583 stream->cr();
2584 }
2585 }
2586 }
2587 }
2588
2589 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2590 // First, find an oopmap in (begin, end].
2591 // We use the odd half-closed interval so that oop maps and scope descs
2592 // which are tied to the byte after a call are printed with the call itself.
2593 address base = code_begin();
2594 ImmutableOopMapSet* oms = oop_maps();
2595 if (oms != NULL) {
2596 for (int i = 0, imax = oms->count(); i < imax; i++) {
2597 const ImmutableOopMapPair* pair = oms->pair_at(i);
2598 const ImmutableOopMap* om = pair->get_from(oms);
2599 address pc = base + pair->pc_offset();
2600 if (pc > begin) {
2601 if (pc <= end) {
2602 st->move_to(column);
2603 st->print("; ");
2604 om->print_on(st);
2605 }
2606 break;
2607 }
2608 }
2609 }
2610
2611 // Print any debug info present at this pc.
2612 ScopeDesc* sd = scope_desc_in(begin, end);
2613 if (sd != NULL) {
2614 st->move_to(column);
2615 if (sd->bci() == SynchronizationEntryBCI) {
2616 st->print(";*synchronization entry");
2617 } else {
2618 if (sd->method() == NULL) {
2619 st->print("method is NULL");
2620 } else if (sd->method()->is_native()) {
2621 st->print("method is native");
2622 } else {
2623 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2624 st->print(";*%s", Bytecodes::name(bc));
2625 switch (bc) {
2626 case Bytecodes::_invokevirtual:
2627 case Bytecodes::_invokespecial:
2628 case Bytecodes::_invokestatic:
2629 case Bytecodes::_invokeinterface:
2630 {
2631 Bytecode_invoke invoke(sd->method(), sd->bci());
2632 st->print(" ");
2633 if (invoke.name() != NULL)
2634 invoke.name()->print_symbol_on(st);
2635 else
2636 st->print("<UNKNOWN>");
2637 break;
2638 }
2639 case Bytecodes::_getfield:
2640 case Bytecodes::_putfield:
2641 case Bytecodes::_getstatic:
2642 case Bytecodes::_putstatic:
2643 {
2644 Bytecode_field field(sd->method(), sd->bci());
2645 st->print(" ");
2646 if (field.name() != NULL)
2647 field.name()->print_symbol_on(st);
2648 else
2649 st->print("<UNKNOWN>");
2650 }
2651 default:
2652 break;
2653 }
2654 }
2655 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2656 }
2657
2658 // Print all scopes
2659 for (;sd != NULL; sd = sd->sender()) {
2660 st->move_to(column);
2661 st->print("; -");
2662 if (sd->method() == NULL) {
2663 st->print("method is NULL");
2664 } else {
2665 sd->method()->print_short_name(st);
2666 }
2667 int lineno = sd->method()->line_number_from_bci(sd->bci());
2668 if (lineno != -1) {
2669 st->print("@%d (line %d)", sd->bci(), lineno);
2670 } else {
2671 st->print("@%d", sd->bci());
2672 }
2673 st->cr();
2674 }
2675 }
2676
2677 // Print relocation information
2678 const char* str = reloc_string_for(begin, end);
2679 if (str != NULL) {
2680 if (sd != NULL) st->cr();
2681 st->move_to(column);
2682 st->print("; {%s}", str);
2683 }
2684 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2685 if (cont_offset != 0) {
2686 st->move_to(column);
2687 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2688 }
2689
2690 }
2691
2692 class DirectNativeCallWrapper: public NativeCallWrapper {
2693 private:
2694 NativeCall* _call;
2695
2696 public:
2697 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2698
2699 virtual address destination() const { return _call->destination(); }
2700 virtual address instruction_address() const { return _call->instruction_address(); }
2701 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2702 virtual address return_address() const { return _call->return_address(); }
2703
2704 virtual address get_resolve_call_stub(bool is_optimized) const {
2705 if (is_optimized) {
2706 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2707 }
2708 return SharedRuntime::get_resolve_virtual_call_stub();
2709 }
2710
2711 virtual void set_destination_mt_safe(address dest) {
2712 #if INCLUDE_AOT
2713 if (UseAOT) {
2714 CodeBlob* callee = CodeCache::find_blob(dest);
2715 CompiledMethod* cm = callee->as_compiled_method_or_null();
2716 if (cm != NULL && cm->is_far_code()) {
2717 // Temporary fix, see JDK-8143106
2718 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2719 csc->set_to_far(methodHandle(cm->method()), dest);
2720 return;
2721 }
2722 }
2723 #endif
2724 _call->set_destination_mt_safe(dest);
2725 }
2726
2727 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2728 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2729 #if INCLUDE_AOT
2730 if (info.to_aot()) {
2731 csc->set_to_far(method, info.entry());
2732 } else
2733 #endif
2734 {
2735 csc->set_to_interpreted(method, info.entry());
2736 }
2737 }
2738
2739 virtual void verify() const {
2740 // make sure code pattern is actually a call imm32 instruction
2741 _call->verify();
2742 if (os::is_MP()) {
2743 _call->verify_alignment();
2744 }
2745 }
2746
2747 virtual void verify_resolve_call(address dest) const {
2748 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2749 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2750 }
2751
2752 virtual bool is_call_to_interpreted(address dest) const {
2753 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2754 return cb->contains(dest);
2755 }
2756
2757 virtual bool is_safe_for_patching() const { return false; }
2758
2759 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2760 return nativeMovConstReg_at(r->cached_value());
2761 }
2762
2763 virtual void *get_data(NativeInstruction* instruction) const {
2764 return (void*)((NativeMovConstReg*) instruction)->data();
2765 }
2766
2767 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2768 ((NativeMovConstReg*) instruction)->set_data(data);
2769 }
2770 };
2771
2772 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2773 return new DirectNativeCallWrapper((NativeCall*) call);
2774 }
2775
2776 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2777 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2778 }
2779
2780 address nmethod::call_instruction_address(address pc) const {
2781 if (NativeCall::is_call_before(pc)) {
2782 NativeCall *ncall = nativeCall_before(pc);
2783 return ncall->instruction_address();
2784 }
2785 return NULL;
2786 }
2787
2788 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2789 return CompiledDirectStaticCall::at(call_site);
2790 }
2791
2792 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2793 return CompiledDirectStaticCall::at(call_site);
2794 }
2795
2796 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2797 return CompiledDirectStaticCall::before(return_addr);
2798 }
2799
2800 #ifndef PRODUCT
2801
2802 void nmethod::print_value_on(outputStream* st) const {
2803 st->print("nmethod");
2804 print_on(st, NULL);
2805 }
2806
2807 void nmethod::print_calls(outputStream* st) {
2808 RelocIterator iter(this);
2809 while (iter.next()) {
2810 switch (iter.type()) {
2811 case relocInfo::virtual_call_type:
2812 case relocInfo::opt_virtual_call_type: {
2813 VerifyMutexLocker mc(CompiledIC_lock);
2814 CompiledIC_at(&iter)->print();
2815 break;
2816 }
2817 case relocInfo::static_call_type:
2818 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2819 CompiledDirectStaticCall::at(iter.reloc())->print();
2820 break;
2821 default:
2822 break;
2823 }
2824 }
2825 }
2826
2827 void nmethod::print_handler_table() {
2828 ExceptionHandlerTable(this).print();
2829 }
2830
2831 void nmethod::print_nul_chk_table() {
2832 ImplicitExceptionTable(this).print(code_begin());
2833 }
2834
2835 void nmethod::print_statistics() {
2836 ttyLocker ttyl;
2837 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2838 native_nmethod_stats.print_native_nmethod_stats();
2839 #ifdef COMPILER1
2840 c1_java_nmethod_stats.print_nmethod_stats("C1");
2841 #endif
2842 #ifdef COMPILER2
2843 c2_java_nmethod_stats.print_nmethod_stats("C2");
2844 #endif
2845 #if INCLUDE_JVMCI
2846 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2847 #endif
2848 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2849 DebugInformationRecorder::print_statistics();
2850 #ifndef PRODUCT
2851 pc_nmethod_stats.print_pc_stats();
2852 #endif
2853 Dependencies::print_statistics();
2854 if (xtty != NULL) xtty->tail("statistics");
2855 }
2856
2857 #endif // !PRODUCT
2858
2859 #if INCLUDE_JVMCI
2860 void nmethod::clear_jvmci_installed_code() {
2861 assert_locked_or_safepoint(Patching_lock);
2862 if (_jvmci_installed_code != NULL) {
2863 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2864 _jvmci_installed_code = NULL;
2865 }
2866 }
2867
2868 void nmethod::clear_speculation_log() {
2869 assert_locked_or_safepoint(Patching_lock);
2870 if (_speculation_log != NULL) {
2871 JNIHandles::destroy_weak_global(_speculation_log);
2872 _speculation_log = NULL;
2873 }
2874 }
2875
2876 void nmethod::maybe_invalidate_installed_code() {
2877 assert(Patching_lock->is_locked() ||
2878 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2879 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2880 if (installed_code != NULL) {
2881 // Update the values in the InstalledCode instance if it still refers to this nmethod
2882 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2883 if (nm == this) {
2884 if (!is_alive()) {
2885 // Break the link between nmethod and InstalledCode such that the nmethod
2886 // can subsequently be flushed safely. The link must be maintained while
2887 // the method could have live activations since invalidateInstalledCode
2888 // might want to invalidate all existing activations.
2889 InstalledCode::set_address(installed_code, 0);
2890 InstalledCode::set_entryPoint(installed_code, 0);
2891 } else if (is_not_entrant()) {
2892 // Remove the entry point so any invocation will fail but keep
2893 // the address link around that so that existing activations can
2894 // be invalidated.
2895 InstalledCode::set_entryPoint(installed_code, 0);
2896 }
2897 }
2898 }
2899 if (!is_alive()) {
2900 // Clear these out after the nmethod has been unregistered and any
2901 // updates to the InstalledCode instance have been performed.
2902 clear_jvmci_installed_code();
2903 clear_speculation_log();
2904 }
2905 }
2906
2907 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2908 if (installedCode() == NULL) {
2909 THROW(vmSymbols::java_lang_NullPointerException());
2910 }
2911 jlong nativeMethod = InstalledCode::address(installedCode);
2912 nmethod* nm = (nmethod*)nativeMethod;
2913 if (nm == NULL) {
2914 // Nothing to do
2915 return;
2916 }
2917
2918 nmethodLocker nml(nm);
2919 #ifdef ASSERT
2920 {
2921 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2922 // This relationship can only be checked safely under a lock
2923 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2924 }
2925 #endif
2926
2927 if (nm->is_alive()) {
2928 // Invalidating the InstalledCode means we want the nmethod
2929 // to be deoptimized.
2930 nm->mark_for_deoptimization();
2931 VM_Deoptimize op;
2932 VMThread::execute(&op);
2933 }
2934
2935 // Multiple threads could reach this point so we now need to
2936 // lock and re-check the link to the nmethod so that only one
2937 // thread clears it.
2938 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2939 if (InstalledCode::address(installedCode) == nativeMethod) {
2940 InstalledCode::set_address(installedCode, 0);
2941 }
2942 }
2943
2944 oop nmethod::jvmci_installed_code() {
2945 return JNIHandles::resolve(_jvmci_installed_code);
2946 }
2947
2948 oop nmethod::speculation_log() {
2949 return JNIHandles::resolve(_speculation_log);
2950 }
2951
2952 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2953 if (!this->is_compiled_by_jvmci()) {
2954 return NULL;
2955 }
2956 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2957 if (installed_code != NULL) {
2958 oop installed_code_name = NULL;
2959 if (installed_code->is_a(InstalledCode::klass())) {
2960 installed_code_name = InstalledCode::name(installed_code);
2961 }
2962 if (installed_code_name != NULL) {
2963 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2964 }
2965 }
2966 return NULL;
2967 }
2968 #endif