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