1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/compileLog.hpp"
36 #include "compiler/compilerDirectives.hpp"
37 #include "compiler/directivesParser.hpp"
38 #include "compiler/disassembler.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/method.inline.hpp"
44 #include "oops/methodData.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jvmtiImpl.hpp"
47 #include "runtime/atomic.hpp"
48 #include "runtime/jniHandles.inline.hpp"
49 #include "runtime/orderAccess.inline.hpp"
50 #include "runtime/os.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/sweeper.hpp"
53 #include "utilities/align.hpp"
54 #include "utilities/dtrace.hpp"
55 #include "utilities/events.hpp"
56 #include "utilities/resourceHash.hpp"
57 #include "utilities/xmlstream.hpp"
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciJavaClasses.hpp"
60 #endif
61
62 #ifdef DTRACE_ENABLED
63
64 // Only bother with this argument setup if dtrace is available
65
66 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
67 { \
68 Method* m = (method); \
69 if (m != NULL) { \
70 Symbol* klass_name = m->klass_name(); \
71 Symbol* name = m->name(); \
72 Symbol* signature = m->signature(); \
73 HOTSPOT_COMPILED_METHOD_UNLOAD( \
74 (char *) klass_name->bytes(), klass_name->utf8_length(), \
75 (char *) name->bytes(), name->utf8_length(), \
76 (char *) signature->bytes(), signature->utf8_length()); \
77 } \
78 }
79
80 #else // ndef DTRACE_ENABLED
81
82 #define DTRACE_METHOD_UNLOAD_PROBE(method)
83
84 #endif
85
86 //---------------------------------------------------------------------------------
87 // NMethod statistics
88 // They are printed under various flags, including:
89 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
90 // (In the latter two cases, they like other stats are printed to the log only.)
91
92 #ifndef PRODUCT
93 // These variables are put into one block to reduce relocations
94 // and make it simpler to print from the debugger.
95 struct java_nmethod_stats_struct {
96 int nmethod_count;
97 int total_size;
98 int relocation_size;
99 int consts_size;
100 int insts_size;
101 int stub_size;
102 int scopes_data_size;
103 int scopes_pcs_size;
104 int dependencies_size;
105 int handler_table_size;
106 int nul_chk_table_size;
107 int oops_size;
108 int metadata_size;
109
110 void note_nmethod(nmethod* nm) {
111 nmethod_count += 1;
112 total_size += nm->size();
113 relocation_size += nm->relocation_size();
114 consts_size += nm->consts_size();
115 insts_size += nm->insts_size();
116 stub_size += nm->stub_size();
117 oops_size += nm->oops_size();
118 metadata_size += nm->metadata_size();
119 scopes_data_size += nm->scopes_data_size();
120 scopes_pcs_size += nm->scopes_pcs_size();
121 dependencies_size += nm->dependencies_size();
122 handler_table_size += nm->handler_table_size();
123 nul_chk_table_size += nm->nul_chk_table_size();
124 }
125 void print_nmethod_stats(const char* name) {
126 if (nmethod_count == 0) return;
127 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
128 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
129 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
130 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
131 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
132 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
133 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
134 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
135 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
136 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
137 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
138 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
139 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
140 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
141 }
142 };
143
144 struct native_nmethod_stats_struct {
145 int native_nmethod_count;
146 int native_total_size;
147 int native_relocation_size;
148 int native_insts_size;
149 int native_oops_size;
150 int native_metadata_size;
151 void note_native_nmethod(nmethod* nm) {
152 native_nmethod_count += 1;
153 native_total_size += nm->size();
154 native_relocation_size += nm->relocation_size();
155 native_insts_size += nm->insts_size();
156 native_oops_size += nm->oops_size();
157 native_metadata_size += nm->metadata_size();
158 }
159 void print_native_nmethod_stats() {
160 if (native_nmethod_count == 0) return;
161 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
162 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
163 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
164 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
165 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
166 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
167 }
168 };
169
170 struct pc_nmethod_stats_struct {
171 int pc_desc_resets; // number of resets (= number of caches)
172 int pc_desc_queries; // queries to nmethod::find_pc_desc
173 int pc_desc_approx; // number of those which have approximate true
174 int pc_desc_repeats; // number of _pc_descs[0] hits
175 int pc_desc_hits; // number of LRU cache hits
176 int pc_desc_tests; // total number of PcDesc examinations
177 int pc_desc_searches; // total number of quasi-binary search steps
178 int pc_desc_adds; // number of LUR cache insertions
179
180 void print_pc_stats() {
181 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
182 pc_desc_queries,
183 (double)(pc_desc_tests + pc_desc_searches)
184 / pc_desc_queries);
185 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
186 pc_desc_resets,
187 pc_desc_queries, pc_desc_approx,
188 pc_desc_repeats, pc_desc_hits,
189 pc_desc_tests, pc_desc_searches, pc_desc_adds);
190 }
191 };
192
193 #ifdef COMPILER1
194 static java_nmethod_stats_struct c1_java_nmethod_stats;
195 #endif
196 #ifdef COMPILER2
197 static java_nmethod_stats_struct c2_java_nmethod_stats;
198 #endif
199 #if INCLUDE_JVMCI
200 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
201 #endif
202 static java_nmethod_stats_struct unknown_java_nmethod_stats;
203
204 static native_nmethod_stats_struct native_nmethod_stats;
205 static pc_nmethod_stats_struct pc_nmethod_stats;
206
207 static void note_java_nmethod(nmethod* nm) {
208 #ifdef COMPILER1
209 if (nm->is_compiled_by_c1()) {
210 c1_java_nmethod_stats.note_nmethod(nm);
211 } else
212 #endif
213 #ifdef COMPILER2
214 if (nm->is_compiled_by_c2()) {
215 c2_java_nmethod_stats.note_nmethod(nm);
216 } else
217 #endif
218 #if INCLUDE_JVMCI
219 if (nm->is_compiled_by_jvmci()) {
220 jvmci_java_nmethod_stats.note_nmethod(nm);
221 } else
222 #endif
223 {
224 unknown_java_nmethod_stats.note_nmethod(nm);
225 }
226 }
227 #endif // !PRODUCT
228
229 //---------------------------------------------------------------------------------
230
231
232 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
233 assert(pc != NULL, "Must be non null");
234 assert(exception.not_null(), "Must be non null");
235 assert(handler != NULL, "Must be non null");
236
237 _count = 0;
238 _exception_type = exception->klass();
239 _next = NULL;
240
241 add_address_and_handler(pc,handler);
242 }
243
244
245 address ExceptionCache::match(Handle exception, address pc) {
246 assert(pc != NULL,"Must be non null");
247 assert(exception.not_null(),"Must be non null");
248 if (exception->klass() == exception_type()) {
249 return (test_address(pc));
250 }
251
252 return NULL;
253 }
254
255
256 bool ExceptionCache::match_exception_with_space(Handle exception) {
257 assert(exception.not_null(),"Must be non null");
258 if (exception->klass() == exception_type() && count() < cache_size) {
259 return true;
260 }
261 return false;
262 }
263
264
265 address ExceptionCache::test_address(address addr) {
266 int limit = count();
267 for (int i = 0; i < limit; i++) {
268 if (pc_at(i) == addr) {
269 return handler_at(i);
270 }
271 }
272 return NULL;
273 }
274
275
276 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
277 if (test_address(addr) == handler) return true;
278
279 int index = count();
280 if (index < cache_size) {
281 set_pc_at(index, addr);
282 set_handler_at(index, handler);
283 increment_count();
284 return true;
285 }
286 return false;
287 }
288
289 //-----------------------------------------------------------------------------
290
291
292 // Helper used by both find_pc_desc methods.
293 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
294 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
295 if (!approximate)
296 return pc->pc_offset() == pc_offset;
297 else
298 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
299 }
300
301 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
302 if (initial_pc_desc == NULL) {
303 _pc_descs[0] = NULL; // native method; no PcDescs at all
304 return;
305 }
306 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
307 // reset the cache by filling it with benign (non-null) values
308 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
309 for (int i = 0; i < cache_size; i++)
310 _pc_descs[i] = initial_pc_desc;
311 }
312
313 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
314 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
315 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
316
317 // Note: one might think that caching the most recently
318 // read value separately would be a win, but one would be
319 // wrong. When many threads are updating it, the cache
320 // line it's in would bounce between caches, negating
321 // any benefit.
322
323 // In order to prevent race conditions do not load cache elements
324 // repeatedly, but use a local copy:
325 PcDesc* res;
326
327 // Step one: Check the most recently added value.
328 res = _pc_descs[0];
329 if (res == NULL) return NULL; // native method; no PcDescs at all
330 if (match_desc(res, pc_offset, approximate)) {
331 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
332 return res;
333 }
334
335 // Step two: Check the rest of the LRU cache.
336 for (int i = 1; i < cache_size; ++i) {
337 res = _pc_descs[i];
338 if (res->pc_offset() < 0) break; // optimization: skip empty cache
339 if (match_desc(res, pc_offset, approximate)) {
340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
341 return res;
342 }
343 }
344
345 // Report failure.
346 return NULL;
347 }
348
349 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
350 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
351 // Update the LRU cache by shifting pc_desc forward.
352 for (int i = 0; i < cache_size; i++) {
353 PcDesc* next = _pc_descs[i];
354 _pc_descs[i] = pc_desc;
355 pc_desc = next;
356 }
357 }
358
359 // adjust pcs_size so that it is a multiple of both oopSize and
360 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
361 // of oopSize, then 2*sizeof(PcDesc) is)
362 static int adjust_pcs_size(int pcs_size) {
363 int nsize = align_up(pcs_size, oopSize);
364 if ((nsize % sizeof(PcDesc)) != 0) {
365 nsize = pcs_size + sizeof(PcDesc);
366 }
367 assert((nsize % oopSize) == 0, "correct alignment");
368 return nsize;
369 }
370
371
372 int nmethod::total_size() const {
373 return
374 consts_size() +
375 insts_size() +
376 stub_size() +
377 scopes_data_size() +
378 scopes_pcs_size() +
379 handler_table_size() +
380 nul_chk_table_size();
381 }
382
383 const char* nmethod::compile_kind() const {
384 if (is_osr_method()) return "osr";
385 if (method() != NULL && is_native_method()) return "c2n";
386 return NULL;
387 }
388
389 // Fill in default values for various flag fields
390 void nmethod::init_defaults() {
391 _state = not_installed;
392 _has_flushed_dependencies = 0;
393 _lock_count = 0;
394 _stack_traversal_mark = 0;
395 _unload_reported = false; // jvmti state
396 _is_far_code = false; // nmethods are located in CodeCache
397
398 #ifdef ASSERT
399 _oops_are_stale = false;
400 #endif
401
402 _oops_do_mark_link = NULL;
403 _jmethod_id = NULL;
404 _osr_link = NULL;
405 _unloading_next = NULL;
406 _scavenge_root_link = NULL;
407 _scavenge_root_state = 0;
408 #if INCLUDE_RTM_OPT
409 _rtm_state = NoRTM;
410 #endif
411 #if INCLUDE_JVMCI
412 _jvmci_installed_code = NULL;
413 _speculation_log = NULL;
414 _jvmci_installed_code_triggers_unloading = false;
415 #endif
416 }
417
418 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
419 int compile_id,
420 CodeBuffer *code_buffer,
421 int vep_offset,
422 int frame_complete,
423 int frame_size,
424 ByteSize basic_lock_owner_sp_offset,
425 ByteSize basic_lock_sp_offset,
426 OopMapSet* oop_maps) {
427 code_buffer->finalize_oop_references(method);
428 // create nmethod
429 nmethod* nm = NULL;
430 {
431 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
432 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
433 CodeOffsets offsets;
434 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
435 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
436 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
437 compile_id, &offsets,
438 code_buffer, frame_size,
439 basic_lock_owner_sp_offset,
440 basic_lock_sp_offset, oop_maps);
441 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
442 }
443
444 if (nm != NULL) {
445 // verify nmethod
446 debug_only(nm->verify();) // might block
447
448 nm->log_new_nmethod();
449 nm->make_in_use();
450 }
451 return nm;
452 }
453
454 nmethod* nmethod::new_nmethod(const methodHandle& method,
455 int compile_id,
456 int entry_bci,
457 CodeOffsets* offsets,
458 int orig_pc_offset,
459 DebugInformationRecorder* debug_info,
460 Dependencies* dependencies,
461 CodeBuffer* code_buffer, int frame_size,
462 OopMapSet* oop_maps,
463 ExceptionHandlerTable* handler_table,
464 ImplicitExceptionTable* nul_chk_table,
465 AbstractCompiler* compiler,
466 int comp_level
467 #if INCLUDE_JVMCI
468 , jweak installed_code,
469 jweak speculationLog
470 #endif
471 )
472 {
473 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
474 code_buffer->finalize_oop_references(method);
475 // create nmethod
476 nmethod* nm = NULL;
477 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
478 int nmethod_size =
479 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
480 + adjust_pcs_size(debug_info->pcs_size())
481 + align_up((int)dependencies->size_in_bytes(), oopSize)
482 + align_up(handler_table->size_in_bytes() , oopSize)
483 + align_up(nul_chk_table->size_in_bytes() , oopSize)
484 + align_up(debug_info->data_size() , oopSize);
485
486 nm = new (nmethod_size, comp_level)
487 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
488 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
489 oop_maps,
490 handler_table,
491 nul_chk_table,
492 compiler,
493 comp_level
494 #if INCLUDE_JVMCI
495 , installed_code,
496 speculationLog
497 #endif
498 );
499
500 if (nm != NULL) {
501 // To make dependency checking during class loading fast, record
502 // the nmethod dependencies in the classes it is dependent on.
503 // This allows the dependency checking code to simply walk the
504 // class hierarchy above the loaded class, checking only nmethods
505 // which are dependent on those classes. The slow way is to
506 // check every nmethod for dependencies which makes it linear in
507 // the number of methods compiled. For applications with a lot
508 // classes the slow way is too slow.
509 for (Dependencies::DepStream deps(nm); deps.next(); ) {
510 if (deps.type() == Dependencies::call_site_target_value) {
511 // CallSite dependencies are managed on per-CallSite instance basis.
512 oop call_site = deps.argument_oop(0);
513 MethodHandles::add_dependent_nmethod(call_site, nm);
514 } else {
515 Klass* klass = deps.context_type();
516 if (klass == NULL) {
517 continue; // ignore things like evol_method
518 }
519 // record this nmethod as dependent on this klass
520 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
521 }
522 }
523 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
524 }
525 }
526 // Do verification and logging outside CodeCache_lock.
527 if (nm != NULL) {
528 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
529 DEBUG_ONLY(nm->verify();)
530 nm->log_new_nmethod();
531 }
532 return nm;
533 }
534
535 // For native wrappers
536 nmethod::nmethod(
537 Method* method,
538 CompilerType type,
539 int nmethod_size,
540 int compile_id,
541 CodeOffsets* offsets,
542 CodeBuffer* code_buffer,
543 int frame_size,
544 ByteSize basic_lock_owner_sp_offset,
545 ByteSize basic_lock_sp_offset,
546 OopMapSet* oop_maps )
547 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
548 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
549 _native_basic_lock_sp_offset(basic_lock_sp_offset)
550 {
551 {
552 int scopes_data_offset = 0;
553 int deoptimize_offset = 0;
554 int deoptimize_mh_offset = 0;
555
556 debug_only(NoSafepointVerifier nsv;)
557 assert_locked_or_safepoint(CodeCache_lock);
558
559 init_defaults();
560 _entry_bci = InvocationEntryBci;
561 // We have no exception handler or deopt handler make the
562 // values something that will never match a pc like the nmethod vtable entry
563 _exception_offset = 0;
564 _orig_pc_offset = 0;
565
566 _consts_offset = data_offset();
567 _stub_offset = data_offset();
568 _oops_offset = data_offset();
569 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
570 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
571 _scopes_pcs_offset = scopes_data_offset;
572 _dependencies_offset = _scopes_pcs_offset;
573 _handler_table_offset = _dependencies_offset;
574 _nul_chk_table_offset = _handler_table_offset;
575 _nmethod_end_offset = _nul_chk_table_offset;
576 _compile_id = compile_id;
577 _comp_level = CompLevel_none;
578 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
579 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
580 _osr_entry_point = NULL;
581 _exception_cache = NULL;
582 _pc_desc_container.reset_to(NULL);
583 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
584
585 _scopes_data_begin = (address) this + scopes_data_offset;
586 _deopt_handler_begin = (address) this + deoptimize_offset;
587 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
588
589 code_buffer->copy_code_and_locs_to(this);
590 code_buffer->copy_values_to(this);
591 if (ScavengeRootsInCode) {
592 Universe::heap()->register_nmethod(this);
593 }
594 debug_only(Universe::heap()->verify_nmethod(this));
595 CodeCache::commit(this);
596 }
597
598 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
599 ttyLocker ttyl; // keep the following output all in one block
600 // This output goes directly to the tty, not the compiler log.
601 // To enable tools to match it up with the compilation activity,
602 // be sure to tag this tty output with the compile ID.
603 if (xtty != NULL) {
604 xtty->begin_head("print_native_nmethod");
605 xtty->method(_method);
606 xtty->stamp();
607 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
608 }
609 // print the header part first
610 print();
611 // then print the requested information
612 if (PrintNativeNMethods) {
613 print_code();
614 if (oop_maps != NULL) {
615 oop_maps->print();
616 }
617 }
618 if (PrintRelocations) {
619 print_relocations();
620 }
621 if (xtty != NULL) {
622 xtty->tail("print_native_nmethod");
623 }
624 }
625 }
626
627 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
628 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
629 }
630
631 nmethod::nmethod(
632 Method* method,
633 CompilerType type,
634 int nmethod_size,
635 int compile_id,
636 int entry_bci,
637 CodeOffsets* offsets,
638 int orig_pc_offset,
639 DebugInformationRecorder* debug_info,
640 Dependencies* dependencies,
641 CodeBuffer *code_buffer,
642 int frame_size,
643 OopMapSet* oop_maps,
644 ExceptionHandlerTable* handler_table,
645 ImplicitExceptionTable* nul_chk_table,
646 AbstractCompiler* compiler,
647 int comp_level
648 #if INCLUDE_JVMCI
649 , jweak installed_code,
650 jweak speculation_log
651 #endif
652 )
653 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
654 _native_receiver_sp_offset(in_ByteSize(-1)),
655 _native_basic_lock_sp_offset(in_ByteSize(-1))
656 {
657 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
658 {
659 debug_only(NoSafepointVerifier nsv;)
660 assert_locked_or_safepoint(CodeCache_lock);
661
662 _deopt_handler_begin = (address) this;
663 _deopt_mh_handler_begin = (address) this;
664
665 init_defaults();
666 _entry_bci = entry_bci;
667 _compile_id = compile_id;
668 _comp_level = comp_level;
669 _orig_pc_offset = orig_pc_offset;
670 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
671
672 // Section offsets
673 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
674 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
675 set_ctable_begin(header_begin() + _consts_offset);
676
677 #if INCLUDE_JVMCI
678 _jvmci_installed_code = installed_code;
679 _speculation_log = speculation_log;
680 oop obj = JNIHandles::resolve(installed_code);
681 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
682 _jvmci_installed_code_triggers_unloading = false;
683 } else {
684 _jvmci_installed_code_triggers_unloading = true;
685 }
686
687 if (compiler->is_jvmci()) {
688 // JVMCI might not produce any stub sections
689 if (offsets->value(CodeOffsets::Exceptions) != -1) {
690 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
691 } else {
692 _exception_offset = -1;
693 }
694 if (offsets->value(CodeOffsets::Deopt) != -1) {
695 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
696 } else {
697 _deopt_handler_begin = NULL;
698 }
699 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
700 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
701 } else {
702 _deopt_mh_handler_begin = NULL;
703 }
704 } else {
705 #endif
706 // Exception handler and deopt handler are in the stub section
707 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
708 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
709
710 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
711 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
712 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
713 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
714 } else {
715 _deopt_mh_handler_begin = NULL;
716 #if INCLUDE_JVMCI
717 }
718 #endif
719 }
720 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
721 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
722 } else {
723 _unwind_handler_offset = -1;
724 }
725
726 _oops_offset = data_offset();
727 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
728 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
729
730 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
731 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
732 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
733 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
734 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
735 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
736 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
737 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
738 _exception_cache = NULL;
739
740 _scopes_data_begin = (address) this + scopes_data_offset;
741
742 _pc_desc_container.reset_to(scopes_pcs_begin());
743
744 code_buffer->copy_code_and_locs_to(this);
745 // Copy contents of ScopeDescRecorder to nmethod
746 code_buffer->copy_values_to(this);
747 debug_info->copy_to(this);
748 dependencies->copy_to(this);
749 if (ScavengeRootsInCode) {
750 Universe::heap()->register_nmethod(this);
751 }
752 debug_only(Universe::heap()->verify_nmethod(this));
753
754 CodeCache::commit(this);
755
756 // Copy contents of ExceptionHandlerTable to nmethod
757 handler_table->copy_to(this);
758 nul_chk_table->copy_to(this);
759
760 // we use the information of entry points to find out if a method is
761 // static or non static
762 assert(compiler->is_c2() || compiler->is_jvmci() ||
763 _method->is_static() == (entry_point() == _verified_entry_point),
764 " entry points must be same for static methods and vice versa");
765 }
766 }
767
768 // Print a short set of xml attributes to identify this nmethod. The
769 // output should be embedded in some other element.
770 void nmethod::log_identity(xmlStream* log) const {
771 log->print(" compile_id='%d'", compile_id());
772 const char* nm_kind = compile_kind();
773 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
774 log->print(" compiler='%s'", compiler_name());
775 if (TieredCompilation) {
776 log->print(" level='%d'", comp_level());
777 }
778 }
779
780
781 #define LOG_OFFSET(log, name) \
782 if (p2i(name##_end()) - p2i(name##_begin())) \
783 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
784 p2i(name##_begin()) - p2i(this))
785
786
787 void nmethod::log_new_nmethod() const {
788 if (LogCompilation && xtty != NULL) {
789 ttyLocker ttyl;
790 HandleMark hm;
791 xtty->begin_elem("nmethod");
792 log_identity(xtty);
793 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
794 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
795
796 LOG_OFFSET(xtty, relocation);
797 LOG_OFFSET(xtty, consts);
798 LOG_OFFSET(xtty, insts);
799 LOG_OFFSET(xtty, stub);
800 LOG_OFFSET(xtty, scopes_data);
801 LOG_OFFSET(xtty, scopes_pcs);
802 LOG_OFFSET(xtty, dependencies);
803 LOG_OFFSET(xtty, handler_table);
804 LOG_OFFSET(xtty, nul_chk_table);
805 LOG_OFFSET(xtty, oops);
806 LOG_OFFSET(xtty, metadata);
807
808 xtty->method(method());
809 xtty->stamp();
810 xtty->end_elem();
811 }
812 }
813
814 #undef LOG_OFFSET
815
816
817 // Print out more verbose output usually for a newly created nmethod.
818 void nmethod::print_on(outputStream* st, const char* msg) const {
819 if (st != NULL) {
820 ttyLocker ttyl;
821 if (WizardMode) {
822 CompileTask::print(st, this, msg, /*short_form:*/ true);
823 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
824 } else {
825 CompileTask::print(st, this, msg, /*short_form:*/ false);
826 }
827 }
828 }
829
830 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
831 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
832 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
833 print_nmethod(printnmethods);
834 }
835 }
836
837 void nmethod::print_nmethod(bool printmethod) {
838 ttyLocker ttyl; // keep the following output all in one block
839 if (xtty != NULL) {
840 xtty->begin_head("print_nmethod");
841 xtty->stamp();
842 xtty->end_head();
843 }
844 // print the header part first
845 print();
846 // then print the requested information
847 if (printmethod) {
848 print_code();
849 print_pcs();
850 if (oop_maps()) {
851 oop_maps()->print();
852 }
853 }
854 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
855 print_scopes();
856 }
857 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
858 print_relocations();
859 }
860 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
861 print_dependencies();
862 }
863 if (printmethod || PrintExceptionHandlers) {
864 print_handler_table();
865 print_nul_chk_table();
866 }
867 if (printmethod) {
868 print_recorded_oops();
869 print_recorded_metadata();
870 }
871 if (xtty != NULL) {
872 xtty->tail("print_nmethod");
873 }
874 }
875
876
877 // Promote one word from an assembly-time handle to a live embedded oop.
878 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
879 if (handle == NULL ||
880 // As a special case, IC oops are initialized to 1 or -1.
881 handle == (jobject) Universe::non_oop_word()) {
882 (*dest) = (oop) handle;
883 } else {
884 (*dest) = JNIHandles::resolve_non_null(handle);
885 }
886 }
887
888
889 // Have to have the same name because it's called by a template
890 void nmethod::copy_values(GrowableArray<jobject>* array) {
891 int length = array->length();
892 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
893 oop* dest = oops_begin();
894 for (int index = 0 ; index < length; index++) {
895 initialize_immediate_oop(&dest[index], array->at(index));
896 }
897
898 // Now we can fix up all the oops in the code. We need to do this
899 // in the code because the assembler uses jobjects as placeholders.
900 // The code and relocations have already been initialized by the
901 // CodeBlob constructor, so it is valid even at this early point to
902 // iterate over relocations and patch the code.
903 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
904 }
905
906 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
907 int length = array->length();
908 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
909 Metadata** dest = metadata_begin();
910 for (int index = 0 ; index < length; index++) {
911 dest[index] = array->at(index);
912 }
913 }
914
915 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
916 // re-patch all oop-bearing instructions, just in case some oops moved
917 RelocIterator iter(this, begin, end);
918 while (iter.next()) {
919 if (iter.type() == relocInfo::oop_type) {
920 oop_Relocation* reloc = iter.oop_reloc();
921 if (initialize_immediates && reloc->oop_is_immediate()) {
922 oop* dest = reloc->oop_addr();
923 initialize_immediate_oop(dest, (jobject) *dest);
924 }
925 // Refresh the oop-related bits of this instruction.
926 reloc->fix_oop_relocation();
927 } else if (iter.type() == relocInfo::metadata_type) {
928 metadata_Relocation* reloc = iter.metadata_reloc();
929 reloc->fix_metadata_relocation();
930 }
931 }
932 }
933
934
935 void nmethod::verify_clean_inline_caches() {
936 assert_locked_or_safepoint(CompiledIC_lock);
937
938 // If the method is not entrant or zombie then a JMP is plastered over the
939 // first few bytes. If an oop in the old code was there, that oop
940 // should not get GC'd. Skip the first few bytes of oops on
941 // not-entrant methods.
942 address low_boundary = verified_entry_point();
943 if (!is_in_use()) {
944 low_boundary += NativeJump::instruction_size;
945 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
946 // This means that the low_boundary is going to be a little too high.
947 // This shouldn't matter, since oops of non-entrant methods are never used.
948 // In fact, why are we bothering to look at oops in a non-entrant method??
949 }
950
951 ResourceMark rm;
952 RelocIterator iter(this, low_boundary);
953 while(iter.next()) {
954 switch(iter.type()) {
955 case relocInfo::virtual_call_type:
956 case relocInfo::opt_virtual_call_type: {
957 CompiledIC *ic = CompiledIC_at(&iter);
958 // Ok, to lookup references to zombies here
959 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
960 assert(cb != NULL, "destination not in CodeBlob?");
961 nmethod* nm = cb->as_nmethod_or_null();
962 if( nm != NULL ) {
963 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
964 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
965 assert(ic->is_clean(), "IC should be clean");
966 }
967 }
968 break;
969 }
970 case relocInfo::static_call_type: {
971 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
972 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
973 assert(cb != NULL, "destination not in CodeBlob?");
974 nmethod* nm = cb->as_nmethod_or_null();
975 if( nm != NULL ) {
976 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
977 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
978 assert(csc->is_clean(), "IC should be clean");
979 }
980 }
981 break;
982 }
983 default:
984 break;
985 }
986 }
987 }
988
989 // This is a private interface with the sweeper.
990 void nmethod::mark_as_seen_on_stack() {
991 assert(is_alive(), "Must be an alive method");
992 // Set the traversal mark to ensure that the sweeper does 2
993 // cleaning passes before moving to zombie.
994 set_stack_traversal_mark(NMethodSweeper::traversal_count());
995 }
996
997 // Tell if a non-entrant method can be converted to a zombie (i.e.,
998 // there are no activations on the stack, not in use by the VM,
999 // and not in use by the ServiceThread)
1000 bool nmethod::can_convert_to_zombie() {
1001 assert(is_not_entrant(), "must be a non-entrant method");
1002
1003 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1004 // count can be greater than the stack traversal count before it hits the
1005 // nmethod for the second time.
1006 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1007 !is_locked_by_vm();
1008 }
1009
1010 void nmethod::inc_decompile_count() {
1011 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1012 // Could be gated by ProfileTraps, but do not bother...
1013 Method* m = method();
1014 if (m == NULL) return;
1015 MethodData* mdo = m->method_data();
1016 if (mdo == NULL) return;
1017 // There is a benign race here. See comments in methodData.hpp.
1018 mdo->inc_decompile_count();
1019 }
1020
1021 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1022
1023 post_compiled_method_unload();
1024
1025 // Since this nmethod is being unloaded, make sure that dependencies
1026 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1027 // indicate that this work is being done during a GC.
1028 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1029 assert(is_alive != NULL, "Should be non-NULL");
1030 // A non-NULL is_alive closure indicates that this is being called during GC.
1031 flush_dependencies(is_alive);
1032
1033 // Break cycle between nmethod & method
1034 LogTarget(Trace, class, unload) lt;
1035 if (lt.is_enabled()) {
1036 LogStream ls(lt);
1037 ls.print_cr("making nmethod " INTPTR_FORMAT
1038 " unloadable, Method*(" INTPTR_FORMAT
1039 "), cause(" INTPTR_FORMAT ")",
1040 p2i(this), p2i(_method), p2i(cause));
1041 }
1042 // Unlink the osr method, so we do not look this up again
1043 if (is_osr_method()) {
1044 // Invalidate the osr nmethod only once
1045 if (is_in_use()) {
1046 invalidate_osr_method();
1047 }
1048 #ifdef ASSERT
1049 if (method() != NULL) {
1050 // Make sure osr nmethod is invalidated, i.e. not on the list
1051 bool found = method()->method_holder()->remove_osr_nmethod(this);
1052 assert(!found, "osr nmethod should have been invalidated");
1053 }
1054 #endif
1055 }
1056
1057 // If _method is already NULL the Method* is about to be unloaded,
1058 // so we don't have to break the cycle. Note that it is possible to
1059 // have the Method* live here, in case we unload the nmethod because
1060 // it is pointing to some oop (other than the Method*) being unloaded.
1061 if (_method != NULL) {
1062 // OSR methods point to the Method*, but the Method* does not
1063 // point back!
1064 if (_method->code() == this) {
1065 _method->clear_code(); // Break a cycle
1066 }
1067 _method = NULL; // Clear the method of this dead nmethod
1068 }
1069
1070 // Make the class unloaded - i.e., change state and notify sweeper
1071 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1072 if (is_in_use()) {
1073 // Transitioning directly from live to unloaded -- so
1074 // we need to force a cache clean-up; remember this
1075 // for later on.
1076 CodeCache::set_needs_cache_clean(true);
1077 }
1078
1079 // Unregister must be done before the state change
1080 Universe::heap()->unregister_nmethod(this);
1081
1082 _state = unloaded;
1083
1084 // Log the unloading.
1085 log_state_change();
1086
1087 #if INCLUDE_JVMCI
1088 // The method can only be unloaded after the pointer to the installed code
1089 // Java wrapper is no longer alive. Here we need to clear out this weak
1090 // reference to the dead object.
1091 maybe_invalidate_installed_code();
1092 #endif
1093
1094 // The Method* is gone at this point
1095 assert(_method == NULL, "Tautology");
1096
1097 set_osr_link(NULL);
1098 NMethodSweeper::report_state_change(this);
1099 }
1100
1101 void nmethod::invalidate_osr_method() {
1102 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1103 // Remove from list of active nmethods
1104 if (method() != NULL) {
1105 method()->method_holder()->remove_osr_nmethod(this);
1106 }
1107 }
1108
1109 void nmethod::log_state_change() const {
1110 if (LogCompilation) {
1111 if (xtty != NULL) {
1112 ttyLocker ttyl; // keep the following output all in one block
1113 if (_state == unloaded) {
1114 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1115 os::current_thread_id());
1116 } else {
1117 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1118 os::current_thread_id(),
1119 (_state == zombie ? " zombie='1'" : ""));
1120 }
1121 log_identity(xtty);
1122 xtty->stamp();
1123 xtty->end_elem();
1124 }
1125 }
1126
1127 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1128 CompileTask::print_ul(this, state_msg);
1129 if (PrintCompilation && _state != unloaded) {
1130 print_on(tty, state_msg);
1131 }
1132 }
1133
1134 /**
1135 * Common functionality for both make_not_entrant and make_zombie
1136 */
1137 bool nmethod::make_not_entrant_or_zombie(int state) {
1138 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1139 assert(!is_zombie(), "should not already be a zombie");
1140
1141 if (_state == state) {
1142 // Avoid taking the lock if already in required state.
1143 // This is safe from races because the state is an end-state,
1144 // which the nmethod cannot back out of once entered.
1145 // No need for fencing either.
1146 return false;
1147 }
1148
1149 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1150 nmethodLocker nml(this);
1151 methodHandle the_method(method());
1152 NoSafepointVerifier nsv;
1153
1154 // during patching, depending on the nmethod state we must notify the GC that
1155 // code has been unloaded, unregistering it. We cannot do this right while
1156 // holding the Patching_lock because we need to use the CodeCache_lock. This
1157 // would be prone to deadlocks.
1158 // This flag is used to remember whether we need to later lock and unregister.
1159 bool nmethod_needs_unregister = false;
1160
1161 {
1162 // invalidate osr nmethod before acquiring the patching lock since
1163 // they both acquire leaf locks and we don't want a deadlock.
1164 // This logic is equivalent to the logic below for patching the
1165 // verified entry point of regular methods. We check that the
1166 // nmethod is in use to ensure that it is invalidated only once.
1167 if (is_osr_method() && is_in_use()) {
1168 // this effectively makes the osr nmethod not entrant
1169 invalidate_osr_method();
1170 }
1171
1172 // Enter critical section. Does not block for safepoint.
1173 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1174
1175 if (_state == state) {
1176 // another thread already performed this transition so nothing
1177 // to do, but return false to indicate this.
1178 return false;
1179 }
1180
1181 // The caller can be calling the method statically or through an inline
1182 // cache call.
1183 if (!is_osr_method() && !is_not_entrant()) {
1184 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1185 SharedRuntime::get_handle_wrong_method_stub());
1186 }
1187
1188 if (is_in_use() && update_recompile_counts()) {
1189 // It's a true state change, so mark the method as decompiled.
1190 // Do it only for transition from alive.
1191 inc_decompile_count();
1192 }
1193
1194 // If the state is becoming a zombie, signal to unregister the nmethod with
1195 // the heap.
1196 // This nmethod may have already been unloaded during a full GC.
1197 if ((state == zombie) && !is_unloaded()) {
1198 nmethod_needs_unregister = true;
1199 }
1200
1201 // Must happen before state change. Otherwise we have a race condition in
1202 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1203 // transition its state from 'not_entrant' to 'zombie' without having to wait
1204 // for stack scanning.
1205 if (state == not_entrant) {
1206 mark_as_seen_on_stack();
1207 OrderAccess::storestore(); // _stack_traversal_mark and _state
1208 }
1209
1210 // Change state
1211 _state = state;
1212
1213 // Log the transition once
1214 log_state_change();
1215
1216 // Invalidate while holding the patching lock
1217 JVMCI_ONLY(maybe_invalidate_installed_code());
1218
1219 // Remove nmethod from method.
1220 // We need to check if both the _code and _from_compiled_code_entry_point
1221 // refer to this nmethod because there is a race in setting these two fields
1222 // in Method* as seen in bugid 4947125.
1223 // If the vep() points to the zombie nmethod, the memory for the nmethod
1224 // could be flushed and the compiler and vtable stubs could still call
1225 // through it.
1226 if (method() != NULL && (method()->code() == this ||
1227 method()->from_compiled_entry() == verified_entry_point())) {
1228 HandleMark hm;
1229 method()->clear_code(false /* already owns Patching_lock */);
1230 }
1231 } // leave critical region under Patching_lock
1232
1233 #ifdef ASSERT
1234 if (is_osr_method() && method() != NULL) {
1235 // Make sure osr nmethod is invalidated, i.e. not on the list
1236 bool found = method()->method_holder()->remove_osr_nmethod(this);
1237 assert(!found, "osr nmethod should have been invalidated");
1238 }
1239 #endif
1240
1241 // When the nmethod becomes zombie it is no longer alive so the
1242 // dependencies must be flushed. nmethods in the not_entrant
1243 // state will be flushed later when the transition to zombie
1244 // happens or they get unloaded.
1245 if (state == zombie) {
1246 {
1247 // Flushing dependencies must be done before any possible
1248 // safepoint can sneak in, otherwise the oops used by the
1249 // dependency logic could have become stale.
1250 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1251 if (nmethod_needs_unregister) {
1252 Universe::heap()->unregister_nmethod(this);
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 #if INCLUDE_JVMCI
1318 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1319 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1320 #endif
1321
1322 CodeBlob::flush();
1323 CodeCache::free(this);
1324 }
1325
1326 //
1327 // Notify all classes this nmethod is dependent on that it is no
1328 // longer dependent. This should only be called in two situations.
1329 // First, when a nmethod transitions to a zombie all dependents need
1330 // to be clear. Since zombification happens at a safepoint there's no
1331 // synchronization issues. The second place is a little more tricky.
1332 // During phase 1 of mark sweep class unloading may happen and as a
1333 // result some nmethods may get unloaded. In this case the flushing
1334 // of dependencies must happen during phase 1 since after GC any
1335 // dependencies in the unloaded nmethod won't be updated, so
1336 // traversing the dependency information in unsafe. In that case this
1337 // function is called with a non-NULL argument and this function only
1338 // notifies instanceKlasses that are reachable
1339
1340 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1341 assert_locked_or_safepoint(CodeCache_lock);
1342 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1343 "is_alive is non-NULL if and only if we are called during GC");
1344 if (!has_flushed_dependencies()) {
1345 set_has_flushed_dependencies();
1346 for (Dependencies::DepStream deps(this); deps.next(); ) {
1347 if (deps.type() == Dependencies::call_site_target_value) {
1348 // CallSite dependencies are managed on per-CallSite instance basis.
1349 oop call_site = deps.argument_oop(0);
1350 MethodHandles::remove_dependent_nmethod(call_site, this);
1351 } else {
1352 Klass* klass = deps.context_type();
1353 if (klass == NULL) {
1354 continue; // ignore things like evol_method
1355 }
1356 // During GC the is_alive closure is non-NULL, and is used to
1357 // determine liveness of dependees that need to be updated.
1358 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1359 // The GC defers deletion of this entry, since there might be multiple threads
1360 // iterating over the _dependencies graph. Other call paths are single-threaded
1361 // and may delete it immediately.
1362 bool delete_immediately = is_alive == NULL;
1363 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1364 }
1365 }
1366 }
1367 }
1368 }
1369
1370
1371 // If this oop is not live, the nmethod can be unloaded.
1372 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1373 assert(root != NULL, "just checking");
1374 oop obj = *root;
1375 if (obj == NULL || is_alive->do_object_b(obj)) {
1376 return false;
1377 }
1378
1379 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1380 // simply because one of its constant oops has gone dead.
1381 // No actual classes need to be unloaded in order for this to occur.
1382 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1383 make_unloaded(is_alive, obj);
1384 return true;
1385 }
1386
1387 // ------------------------------------------------------------------
1388 // post_compiled_method_load_event
1389 // new method for install_code() path
1390 // Transfer information from compilation to jvmti
1391 void nmethod::post_compiled_method_load_event() {
1392
1393 Method* moop = method();
1394 HOTSPOT_COMPILED_METHOD_LOAD(
1395 (char *) moop->klass_name()->bytes(),
1396 moop->klass_name()->utf8_length(),
1397 (char *) moop->name()->bytes(),
1398 moop->name()->utf8_length(),
1399 (char *) moop->signature()->bytes(),
1400 moop->signature()->utf8_length(),
1401 insts_begin(), insts_size());
1402
1403 if (JvmtiExport::should_post_compiled_method_load() ||
1404 JvmtiExport::should_post_compiled_method_unload()) {
1405 get_and_cache_jmethod_id();
1406 }
1407
1408 if (JvmtiExport::should_post_compiled_method_load()) {
1409 // Let the Service thread (which is a real Java thread) post the event
1410 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1411 JvmtiDeferredEventQueue::enqueue(
1412 JvmtiDeferredEvent::compiled_method_load_event(this));
1413 }
1414 }
1415
1416 jmethodID nmethod::get_and_cache_jmethod_id() {
1417 if (_jmethod_id == NULL) {
1418 // Cache the jmethod_id since it can no longer be looked up once the
1419 // method itself has been marked for unloading.
1420 _jmethod_id = method()->jmethod_id();
1421 }
1422 return _jmethod_id;
1423 }
1424
1425 void nmethod::post_compiled_method_unload() {
1426 if (unload_reported()) {
1427 // During unloading we transition to unloaded and then to zombie
1428 // and the unloading is reported during the first transition.
1429 return;
1430 }
1431
1432 assert(_method != NULL && !is_unloaded(), "just checking");
1433 DTRACE_METHOD_UNLOAD_PROBE(method());
1434
1435 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1436 // post the event. Sometime later this nmethod will be made a zombie
1437 // by the sweeper but the Method* will not be valid at that point.
1438 // If the _jmethod_id is null then no load event was ever requested
1439 // so don't bother posting the unload. The main reason for this is
1440 // that the jmethodID is a weak reference to the Method* so if
1441 // it's being unloaded there's no way to look it up since the weak
1442 // ref will have been cleared.
1443 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1444 assert(!unload_reported(), "already unloaded");
1445 JvmtiDeferredEvent event =
1446 JvmtiDeferredEvent::compiled_method_unload_event(this,
1447 _jmethod_id, insts_begin());
1448 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1449 JvmtiDeferredEventQueue::enqueue(event);
1450 }
1451
1452 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1453 // any time. As the nmethod is being unloaded now we mark it has
1454 // having the unload event reported - this will ensure that we don't
1455 // attempt to report the event in the unlikely scenario where the
1456 // event is enabled at the time the nmethod is made a zombie.
1457 set_unload_reported();
1458 }
1459
1460 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1461 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1462
1463 oop_Relocation* r = iter_at_oop->oop_reloc();
1464 // Traverse those oops directly embedded in the code.
1465 // Other oops (oop_index>0) are seen as part of scopes_oops.
1466 assert(1 == (r->oop_is_immediate()) +
1467 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1468 "oop must be found in exactly one place");
1469 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1470 // Unload this nmethod if the oop is dead.
1471 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1472 return true;;
1473 }
1474 }
1475
1476 return false;
1477 }
1478
1479 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1480 // Scopes
1481 for (oop* p = oops_begin(); p < oops_end(); p++) {
1482 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1483 if (can_unload(is_alive, p, unloading_occurred)) {
1484 return true;
1485 }
1486 }
1487 return false;
1488 }
1489
1490 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1491 // Compiled code
1492
1493 // Prevent extra code cache walk for platforms that don't have immediate oops.
1494 if (relocInfo::mustIterateImmediateOopsInCode()) {
1495 RelocIterator iter(this, low_boundary);
1496 while (iter.next()) {
1497 if (iter.type() == relocInfo::oop_type) {
1498 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1499 return true;
1500 }
1501 }
1502 }
1503 }
1504
1505 return do_unloading_scopes(is_alive, unloading_occurred);
1506 }
1507
1508 #if INCLUDE_JVMCI
1509 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1510 if (_jvmci_installed_code != NULL) {
1511 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1512 if (_jvmci_installed_code_triggers_unloading) {
1513 // jweak reference processing has already cleared the referent
1514 make_unloaded(is_alive, NULL);
1515 return true;
1516 } else {
1517 clear_jvmci_installed_code();
1518 }
1519 }
1520 }
1521 return false;
1522 }
1523 #endif
1524
1525 // Iterate over metadata calling this function. Used by RedefineClasses
1526 void nmethod::metadata_do(void f(Metadata*)) {
1527 address low_boundary = verified_entry_point();
1528 if (is_not_entrant()) {
1529 low_boundary += NativeJump::instruction_size;
1530 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1531 // (See comment above.)
1532 }
1533 {
1534 // Visit all immediate references that are embedded in the instruction stream.
1535 RelocIterator iter(this, low_boundary);
1536 while (iter.next()) {
1537 if (iter.type() == relocInfo::metadata_type ) {
1538 metadata_Relocation* r = iter.metadata_reloc();
1539 // In this metadata, we must only follow those metadatas directly embedded in
1540 // the code. Other metadatas (oop_index>0) are seen as part of
1541 // the metadata section below.
1542 assert(1 == (r->metadata_is_immediate()) +
1543 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1544 "metadata must be found in exactly one place");
1545 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1546 Metadata* md = r->metadata_value();
1547 if (md != _method) f(md);
1548 }
1549 } else if (iter.type() == relocInfo::virtual_call_type) {
1550 // Check compiledIC holders associated with this nmethod
1551 CompiledIC *ic = CompiledIC_at(&iter);
1552 if (ic->is_icholder_call()) {
1553 CompiledICHolder* cichk = ic->cached_icholder();
1554 f(cichk->holder_metadata());
1555 f(cichk->holder_klass());
1556 } else {
1557 Metadata* ic_oop = ic->cached_metadata();
1558 if (ic_oop != NULL) {
1559 f(ic_oop);
1560 }
1561 }
1562 }
1563 }
1564 }
1565
1566 // Visit the metadata section
1567 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1568 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1569 Metadata* md = *p;
1570 f(md);
1571 }
1572
1573 // Visit metadata not embedded in the other places.
1574 if (_method != NULL) f(_method);
1575 }
1576
1577 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1578 // make sure the oops ready to receive visitors
1579 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1580 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1581
1582 // If the method is not entrant or zombie then a JMP is plastered over the
1583 // first few bytes. If an oop in the old code was there, that oop
1584 // should not get GC'd. Skip the first few bytes of oops on
1585 // not-entrant methods.
1586 address low_boundary = verified_entry_point();
1587 if (is_not_entrant()) {
1588 low_boundary += NativeJump::instruction_size;
1589 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1590 // (See comment above.)
1591 }
1592
1593 // Prevent extra code cache walk for platforms that don't have immediate oops.
1594 if (relocInfo::mustIterateImmediateOopsInCode()) {
1595 RelocIterator iter(this, low_boundary);
1596
1597 while (iter.next()) {
1598 if (iter.type() == relocInfo::oop_type ) {
1599 oop_Relocation* r = iter.oop_reloc();
1600 // In this loop, we must only follow those oops directly embedded in
1601 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1602 assert(1 == (r->oop_is_immediate()) +
1603 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1604 "oop must be found in exactly one place");
1605 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1606 f->do_oop(r->oop_addr());
1607 }
1608 }
1609 }
1610 }
1611
1612 // Scopes
1613 // This includes oop constants not inlined in the code stream.
1614 for (oop* p = oops_begin(); p < oops_end(); p++) {
1615 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1616 f->do_oop(p);
1617 }
1618 }
1619
1620 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1621
1622 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1623
1624 // An nmethod is "marked" if its _mark_link is set non-null.
1625 // Even if it is the end of the linked list, it will have a non-null link value,
1626 // as long as it is on the list.
1627 // This code must be MP safe, because it is used from parallel GC passes.
1628 bool nmethod::test_set_oops_do_mark() {
1629 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1630 if (_oops_do_mark_link == NULL) {
1631 // Claim this nmethod for this thread to mark.
1632 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1633 // Atomically append this nmethod (now claimed) to the head of the list:
1634 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1635 for (;;) {
1636 nmethod* required_mark_nmethods = observed_mark_nmethods;
1637 _oops_do_mark_link = required_mark_nmethods;
1638 observed_mark_nmethods =
1639 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1640 if (observed_mark_nmethods == required_mark_nmethods)
1641 break;
1642 }
1643 // Mark was clear when we first saw this guy.
1644 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1645 return false;
1646 }
1647 }
1648 // On fall through, another racing thread marked this nmethod before we did.
1649 return true;
1650 }
1651
1652 void nmethod::oops_do_marking_prologue() {
1653 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1654 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1655 // We use cmpxchg instead of regular assignment here because the user
1656 // may fork a bunch of threads, and we need them all to see the same state.
1657 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1658 guarantee(observed == NULL, "no races in this sequential code");
1659 }
1660
1661 void nmethod::oops_do_marking_epilogue() {
1662 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1663 nmethod* cur = _oops_do_mark_nmethods;
1664 while (cur != NMETHOD_SENTINEL) {
1665 assert(cur != NULL, "not NULL-terminated");
1666 nmethod* next = cur->_oops_do_mark_link;
1667 cur->_oops_do_mark_link = NULL;
1668 DEBUG_ONLY(cur->verify_oop_relocations());
1669 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1670 cur = next;
1671 }
1672 nmethod* required = _oops_do_mark_nmethods;
1673 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1674 guarantee(observed == required, "no races in this sequential code");
1675 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1676 }
1677
1678 class DetectScavengeRoot: public OopClosure {
1679 bool _detected_scavenge_root;
1680 public:
1681 DetectScavengeRoot() : _detected_scavenge_root(false)
1682 { NOT_PRODUCT(_print_nm = NULL); }
1683 bool detected_scavenge_root() { return _detected_scavenge_root; }
1684 virtual void do_oop(oop* p) {
1685 if ((*p) != NULL && (*p)->is_scavengable()) {
1686 NOT_PRODUCT(maybe_print(p));
1687 _detected_scavenge_root = true;
1688 }
1689 }
1690 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1691
1692 #ifndef PRODUCT
1693 nmethod* _print_nm;
1694 void maybe_print(oop* p) {
1695 if (_print_nm == NULL) return;
1696 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1697 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1698 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1699 p2i(*p), p2i(p));
1700 (*p)->print();
1701 }
1702 #endif //PRODUCT
1703 };
1704
1705 bool nmethod::detect_scavenge_root_oops() {
1706 DetectScavengeRoot detect_scavenge_root;
1707 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1708 oops_do(&detect_scavenge_root);
1709 return detect_scavenge_root.detected_scavenge_root();
1710 }
1711
1712 inline bool includes(void* p, void* from, void* to) {
1713 return from <= p && p < to;
1714 }
1715
1716
1717 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1718 assert(count >= 2, "must be sentinel values, at least");
1719
1720 #ifdef ASSERT
1721 // must be sorted and unique; we do a binary search in find_pc_desc()
1722 int prev_offset = pcs[0].pc_offset();
1723 assert(prev_offset == PcDesc::lower_offset_limit,
1724 "must start with a sentinel");
1725 for (int i = 1; i < count; i++) {
1726 int this_offset = pcs[i].pc_offset();
1727 assert(this_offset > prev_offset, "offsets must be sorted");
1728 prev_offset = this_offset;
1729 }
1730 assert(prev_offset == PcDesc::upper_offset_limit,
1731 "must end with a sentinel");
1732 #endif //ASSERT
1733
1734 // Search for MethodHandle invokes and tag the nmethod.
1735 for (int i = 0; i < count; i++) {
1736 if (pcs[i].is_method_handle_invoke()) {
1737 set_has_method_handle_invokes(true);
1738 break;
1739 }
1740 }
1741 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1742
1743 int size = count * sizeof(PcDesc);
1744 assert(scopes_pcs_size() >= size, "oob");
1745 memcpy(scopes_pcs_begin(), pcs, size);
1746
1747 // Adjust the final sentinel downward.
1748 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1749 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1750 last_pc->set_pc_offset(content_size() + 1);
1751 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1752 // Fill any rounding gaps with copies of the last record.
1753 last_pc[1] = last_pc[0];
1754 }
1755 // The following assert could fail if sizeof(PcDesc) is not
1756 // an integral multiple of oopSize (the rounding term).
1757 // If it fails, change the logic to always allocate a multiple
1758 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1759 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1760 }
1761
1762 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1763 assert(scopes_data_size() >= size, "oob");
1764 memcpy(scopes_data_begin(), buffer, size);
1765 }
1766
1767 #ifdef ASSERT
1768 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1769 PcDesc* lower = search.scopes_pcs_begin();
1770 PcDesc* upper = search.scopes_pcs_end();
1771 lower += 1; // exclude initial sentinel
1772 PcDesc* res = NULL;
1773 for (PcDesc* p = lower; p < upper; p++) {
1774 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1775 if (match_desc(p, pc_offset, approximate)) {
1776 if (res == NULL)
1777 res = p;
1778 else
1779 res = (PcDesc*) badAddress;
1780 }
1781 }
1782 return res;
1783 }
1784 #endif
1785
1786
1787 // Finds a PcDesc with real-pc equal to "pc"
1788 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1789 address base_address = search.code_begin();
1790 if ((pc < base_address) ||
1791 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1792 return NULL; // PC is wildly out of range
1793 }
1794 int pc_offset = (int) (pc - base_address);
1795
1796 // Check the PcDesc cache if it contains the desired PcDesc
1797 // (This as an almost 100% hit rate.)
1798 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1799 if (res != NULL) {
1800 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1801 return res;
1802 }
1803
1804 // Fallback algorithm: quasi-linear search for the PcDesc
1805 // Find the last pc_offset less than the given offset.
1806 // The successor must be the required match, if there is a match at all.
1807 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1808 PcDesc* lower = search.scopes_pcs_begin();
1809 PcDesc* upper = search.scopes_pcs_end();
1810 upper -= 1; // exclude final sentinel
1811 if (lower >= upper) return NULL; // native method; no PcDescs at all
1812
1813 #define assert_LU_OK \
1814 /* invariant on lower..upper during the following search: */ \
1815 assert(lower->pc_offset() < pc_offset, "sanity"); \
1816 assert(upper->pc_offset() >= pc_offset, "sanity")
1817 assert_LU_OK;
1818
1819 // Use the last successful return as a split point.
1820 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1821 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1822 if (mid->pc_offset() < pc_offset) {
1823 lower = mid;
1824 } else {
1825 upper = mid;
1826 }
1827
1828 // Take giant steps at first (4096, then 256, then 16, then 1)
1829 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1830 const int RADIX = (1 << LOG2_RADIX);
1831 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1832 while ((mid = lower + step) < upper) {
1833 assert_LU_OK;
1834 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1835 if (mid->pc_offset() < pc_offset) {
1836 lower = mid;
1837 } else {
1838 upper = mid;
1839 break;
1840 }
1841 }
1842 assert_LU_OK;
1843 }
1844
1845 // Sneak up on the value with a linear search of length ~16.
1846 while (true) {
1847 assert_LU_OK;
1848 mid = lower + 1;
1849 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1850 if (mid->pc_offset() < pc_offset) {
1851 lower = mid;
1852 } else {
1853 upper = mid;
1854 break;
1855 }
1856 }
1857 #undef assert_LU_OK
1858
1859 if (match_desc(upper, pc_offset, approximate)) {
1860 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1861 _pc_desc_cache.add_pc_desc(upper);
1862 return upper;
1863 } else {
1864 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1865 return NULL;
1866 }
1867 }
1868
1869
1870 void nmethod::check_all_dependencies(DepChange& changes) {
1871 // Checked dependencies are allocated into this ResourceMark
1872 ResourceMark rm;
1873
1874 // Turn off dependency tracing while actually testing dependencies.
1875 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1876
1877 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1878 &DependencySignature::equals, 11027> DepTable;
1879
1880 DepTable* table = new DepTable();
1881
1882 // Iterate over live nmethods and check dependencies of all nmethods that are not
1883 // marked for deoptimization. A particular dependency is only checked once.
1884 NMethodIterator iter;
1885 while(iter.next()) {
1886 nmethod* nm = iter.method();
1887 // Only notify for live nmethods
1888 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1889 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1890 // Construct abstraction of a dependency.
1891 DependencySignature* current_sig = new DependencySignature(deps);
1892
1893 // Determine if dependency is already checked. table->put(...) returns
1894 // 'true' if the dependency is added (i.e., was not in the hashtable).
1895 if (table->put(*current_sig, 1)) {
1896 if (deps.check_dependency() != NULL) {
1897 // Dependency checking failed. Print out information about the failed
1898 // dependency and finally fail with an assert. We can fail here, since
1899 // dependency checking is never done in a product build.
1900 tty->print_cr("Failed dependency:");
1901 changes.print();
1902 nm->print();
1903 nm->print_dependencies();
1904 assert(false, "Should have been marked for deoptimization");
1905 }
1906 }
1907 }
1908 }
1909 }
1910 }
1911
1912 bool nmethod::check_dependency_on(DepChange& changes) {
1913 // What has happened:
1914 // 1) a new class dependee has been added
1915 // 2) dependee and all its super classes have been marked
1916 bool found_check = false; // set true if we are upset
1917 for (Dependencies::DepStream deps(this); deps.next(); ) {
1918 // Evaluate only relevant dependencies.
1919 if (deps.spot_check_dependency_at(changes) != NULL) {
1920 found_check = true;
1921 NOT_DEBUG(break);
1922 }
1923 }
1924 return found_check;
1925 }
1926
1927 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1928 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1929 Array<Method*>* dependee_methods = dependee_ik->methods();
1930 for (Dependencies::DepStream deps(this); deps.next(); ) {
1931 if (deps.type() == Dependencies::evol_method) {
1932 Method* method = deps.method_argument(0);
1933 for (int j = 0; j < dependee_methods->length(); j++) {
1934 if (dependee_methods->at(j) == method) {
1935 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1936 ResourceMark rm;
1937 log_debug(redefine, class, nmethod)
1938 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1939 _method->method_holder()->external_name(),
1940 _method->name()->as_C_string(),
1941 _method->signature()->as_C_string(),
1942 compile_id(),
1943 method->method_holder()->external_name(),
1944 method->name()->as_C_string(),
1945 method->signature()->as_C_string());
1946 }
1947 if (TraceDependencies || LogCompilation)
1948 deps.log_dependency(dependee);
1949 return true;
1950 }
1951 }
1952 }
1953 }
1954 return false;
1955 }
1956
1957 // Called from mark_for_deoptimization, when dependee is invalidated.
1958 bool nmethod::is_dependent_on_method(Method* dependee) {
1959 for (Dependencies::DepStream deps(this); deps.next(); ) {
1960 if (deps.type() != Dependencies::evol_method)
1961 continue;
1962 Method* method = deps.method_argument(0);
1963 if (method == dependee) return true;
1964 }
1965 return false;
1966 }
1967
1968
1969 bool nmethod::is_patchable_at(address instr_addr) {
1970 assert(insts_contains(instr_addr), "wrong nmethod used");
1971 if (is_zombie()) {
1972 // a zombie may never be patched
1973 return false;
1974 }
1975 return true;
1976 }
1977
1978
1979 address nmethod::continuation_for_implicit_exception(address pc) {
1980 // Exception happened outside inline-cache check code => we are inside
1981 // an active nmethod => use cpc to determine a return address
1982 int exception_offset = pc - code_begin();
1983 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1984 #ifdef ASSERT
1985 if (cont_offset == 0) {
1986 Thread* thread = Thread::current();
1987 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1988 HandleMark hm(thread);
1989 ResourceMark rm(thread);
1990 CodeBlob* cb = CodeCache::find_blob(pc);
1991 assert(cb != NULL && cb == this, "");
1992 ttyLocker ttyl;
1993 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
1994 print();
1995 method()->print_codes();
1996 print_code();
1997 print_pcs();
1998 }
1999 #endif
2000 if (cont_offset == 0) {
2001 // Let the normal error handling report the exception
2002 return NULL;
2003 }
2004 return code_begin() + cont_offset;
2005 }
2006
2007
2008
2009 void nmethod_init() {
2010 // make sure you didn't forget to adjust the filler fields
2011 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2012 }
2013
2014
2015 //-------------------------------------------------------------------------------------------
2016
2017
2018 // QQQ might we make this work from a frame??
2019 nmethodLocker::nmethodLocker(address pc) {
2020 CodeBlob* cb = CodeCache::find_blob(pc);
2021 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2022 _nm = cb->as_compiled_method();
2023 lock_nmethod(_nm);
2024 }
2025
2026 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2027 // should pass zombie_ok == true.
2028 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2029 if (cm == NULL) return;
2030 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2031 nmethod* nm = cm->as_nmethod();
2032 Atomic::inc(&nm->_lock_count);
2033 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2034 }
2035
2036 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2037 if (cm == NULL) return;
2038 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2039 nmethod* nm = cm->as_nmethod();
2040 Atomic::dec(&nm->_lock_count);
2041 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2042 }
2043
2044
2045 // -----------------------------------------------------------------------------
2046 // Verification
2047
2048 class VerifyOopsClosure: public OopClosure {
2049 nmethod* _nm;
2050 bool _ok;
2051 public:
2052 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2053 bool ok() { return _ok; }
2054 virtual void do_oop(oop* p) {
2055 if (oopDesc::is_oop_or_null(*p)) return;
2056 if (_ok) {
2057 _nm->print_nmethod(true);
2058 _ok = false;
2059 }
2060 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2061 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2062 }
2063 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2064 };
2065
2066 void nmethod::verify() {
2067
2068 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2069 // seems odd.
2070
2071 if (is_zombie() || is_not_entrant() || is_unloaded())
2072 return;
2073
2074 // Make sure all the entry points are correctly aligned for patching.
2075 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2076
2077 // assert(oopDesc::is_oop(method()), "must be valid");
2078
2079 ResourceMark rm;
2080
2081 if (!CodeCache::contains(this)) {
2082 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2083 }
2084
2085 if(is_native_method() )
2086 return;
2087
2088 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2089 if (nm != this) {
2090 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2091 }
2092
2093 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2094 if (! p->verify(this)) {
2095 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2096 }
2097 }
2098
2099 VerifyOopsClosure voc(this);
2100 oops_do(&voc);
2101 assert(voc.ok(), "embedded oops must be OK");
2102 Universe::heap()->verify_nmethod(this);
2103
2104 verify_scopes();
2105 }
2106
2107
2108 void nmethod::verify_interrupt_point(address call_site) {
2109 // Verify IC only when nmethod installation is finished.
2110 if (!is_not_installed()) {
2111 Thread *cur = Thread::current();
2112 if (CompiledIC_lock->owner() == cur ||
2113 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2114 SafepointSynchronize::is_at_safepoint())) {
2115 CompiledIC_at(this, call_site);
2116 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2117 } else {
2118 MutexLocker ml_verify (CompiledIC_lock);
2119 CompiledIC_at(this, call_site);
2120 }
2121 }
2122
2123 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2124 assert(pd != NULL, "PcDesc must exist");
2125 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2126 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2127 pd->return_oop());
2128 !sd->is_top(); sd = sd->sender()) {
2129 sd->verify();
2130 }
2131 }
2132
2133 void nmethod::verify_scopes() {
2134 if( !method() ) return; // Runtime stubs have no scope
2135 if (method()->is_native()) return; // Ignore stub methods.
2136 // iterate through all interrupt point
2137 // and verify the debug information is valid.
2138 RelocIterator iter((nmethod*)this);
2139 while (iter.next()) {
2140 address stub = NULL;
2141 switch (iter.type()) {
2142 case relocInfo::virtual_call_type:
2143 verify_interrupt_point(iter.addr());
2144 break;
2145 case relocInfo::opt_virtual_call_type:
2146 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2147 verify_interrupt_point(iter.addr());
2148 break;
2149 case relocInfo::static_call_type:
2150 stub = iter.static_call_reloc()->static_stub(false);
2151 //verify_interrupt_point(iter.addr());
2152 break;
2153 case relocInfo::runtime_call_type:
2154 case relocInfo::runtime_call_w_cp_type: {
2155 address destination = iter.reloc()->value();
2156 // Right now there is no way to find out which entries support
2157 // an interrupt point. It would be nice if we had this
2158 // information in a table.
2159 break;
2160 }
2161 default:
2162 break;
2163 }
2164 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2165 }
2166 }
2167
2168
2169 // -----------------------------------------------------------------------------
2170 // Non-product code
2171 #ifndef PRODUCT
2172
2173 class DebugScavengeRoot: public OopClosure {
2174 nmethod* _nm;
2175 bool _ok;
2176 public:
2177 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2178 bool ok() { return _ok; }
2179 virtual void do_oop(oop* p) {
2180 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2181 if (_ok) {
2182 _nm->print_nmethod(true);
2183 _ok = false;
2184 }
2185 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2186 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2187 (*p)->print();
2188 }
2189 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2190 };
2191
2192 void nmethod::verify_scavenge_root_oops() {
2193 if (!on_scavenge_root_list()) {
2194 // Actually look inside, to verify the claim that it's clean.
2195 DebugScavengeRoot debug_scavenge_root(this);
2196 oops_do(&debug_scavenge_root);
2197 if (!debug_scavenge_root.ok())
2198 fatal("found an unadvertised bad scavengable oop in the code cache");
2199 }
2200 assert(scavenge_root_not_marked(), "");
2201 }
2202
2203 #endif // PRODUCT
2204
2205 // Printing operations
2206
2207 void nmethod::print() const {
2208 ResourceMark rm;
2209 ttyLocker ttyl; // keep the following output all in one block
2210
2211 tty->print("Compiled method ");
2212
2213 if (is_compiled_by_c1()) {
2214 tty->print("(c1) ");
2215 } else if (is_compiled_by_c2()) {
2216 tty->print("(c2) ");
2217 } else if (is_compiled_by_jvmci()) {
2218 tty->print("(JVMCI) ");
2219 } else {
2220 tty->print("(nm) ");
2221 }
2222
2223 print_on(tty, NULL);
2224
2225 if (WizardMode) {
2226 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2227 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2228 tty->print(" { ");
2229 tty->print_cr("%s ", state());
2230 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2231 tty->print_cr("}:");
2232 }
2233 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2234 p2i(this),
2235 p2i(this) + size(),
2236 size());
2237 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2238 p2i(relocation_begin()),
2239 p2i(relocation_end()),
2240 relocation_size());
2241 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2242 p2i(consts_begin()),
2243 p2i(consts_end()),
2244 consts_size());
2245 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2246 p2i(insts_begin()),
2247 p2i(insts_end()),
2248 insts_size());
2249 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2250 p2i(stub_begin()),
2251 p2i(stub_end()),
2252 stub_size());
2253 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2254 p2i(oops_begin()),
2255 p2i(oops_end()),
2256 oops_size());
2257 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2258 p2i(metadata_begin()),
2259 p2i(metadata_end()),
2260 metadata_size());
2261 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2262 p2i(scopes_data_begin()),
2263 p2i(scopes_data_end()),
2264 scopes_data_size());
2265 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(scopes_pcs_begin()),
2267 p2i(scopes_pcs_end()),
2268 scopes_pcs_size());
2269 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(dependencies_begin()),
2271 p2i(dependencies_end()),
2272 dependencies_size());
2273 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(handler_table_begin()),
2275 p2i(handler_table_end()),
2276 handler_table_size());
2277 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(nul_chk_table_begin()),
2279 p2i(nul_chk_table_end()),
2280 nul_chk_table_size());
2281 }
2282
2283 #ifndef PRODUCT
2284
2285 void nmethod::print_scopes() {
2286 // Find the first pc desc for all scopes in the code and print it.
2287 ResourceMark rm;
2288 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2289 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2290 continue;
2291
2292 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2293 while (sd != NULL) {
2294 sd->print_on(tty, p);
2295 sd = sd->sender();
2296 }
2297 }
2298 }
2299
2300 void nmethod::print_dependencies() {
2301 ResourceMark rm;
2302 ttyLocker ttyl; // keep the following output all in one block
2303 tty->print_cr("Dependencies:");
2304 for (Dependencies::DepStream deps(this); deps.next(); ) {
2305 deps.print_dependency();
2306 Klass* ctxk = deps.context_type();
2307 if (ctxk != NULL) {
2308 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2309 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2310 }
2311 }
2312 deps.log_dependency(); // put it into the xml log also
2313 }
2314 }
2315
2316
2317 void nmethod::print_relocations() {
2318 ResourceMark m; // in case methods get printed via the debugger
2319 tty->print_cr("relocations:");
2320 RelocIterator iter(this);
2321 iter.print();
2322 }
2323
2324
2325 void nmethod::print_pcs() {
2326 ResourceMark m; // in case methods get printed via debugger
2327 tty->print_cr("pc-bytecode offsets:");
2328 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2329 p->print(this);
2330 }
2331 }
2332
2333 void nmethod::print_recorded_oops() {
2334 tty->print_cr("Recorded oops:");
2335 for (int i = 0; i < oops_count(); i++) {
2336 oop o = oop_at(i);
2337 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2338 if (o == (oop)Universe::non_oop_word()) {
2339 tty->print("non-oop word");
2340 } else {
2341 o->print_value();
2342 }
2343 tty->cr();
2344 }
2345 }
2346
2347 void nmethod::print_recorded_metadata() {
2348 tty->print_cr("Recorded metadata:");
2349 for (int i = 0; i < metadata_count(); i++) {
2350 Metadata* m = metadata_at(i);
2351 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2352 if (m == (Metadata*)Universe::non_oop_word()) {
2353 tty->print("non-metadata word");
2354 } else {
2355 m->print_value_on_maybe_null(tty);
2356 }
2357 tty->cr();
2358 }
2359 }
2360
2361 #endif // PRODUCT
2362
2363 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2364 RelocIterator iter(this, begin, end);
2365 bool have_one = false;
2366 while (iter.next()) {
2367 have_one = true;
2368 switch (iter.type()) {
2369 case relocInfo::none: return "no_reloc";
2370 case relocInfo::oop_type: {
2371 stringStream st;
2372 oop_Relocation* r = iter.oop_reloc();
2373 oop obj = r->oop_value();
2374 st.print("oop(");
2375 if (obj == NULL) st.print("NULL");
2376 else obj->print_value_on(&st);
2377 st.print(")");
2378 return st.as_string();
2379 }
2380 case relocInfo::metadata_type: {
2381 stringStream st;
2382 metadata_Relocation* r = iter.metadata_reloc();
2383 Metadata* obj = r->metadata_value();
2384 st.print("metadata(");
2385 if (obj == NULL) st.print("NULL");
2386 else obj->print_value_on(&st);
2387 st.print(")");
2388 return st.as_string();
2389 }
2390 case relocInfo::runtime_call_type:
2391 case relocInfo::runtime_call_w_cp_type: {
2392 stringStream st;
2393 st.print("runtime_call");
2394 CallRelocation* r = (CallRelocation*)iter.reloc();
2395 address dest = r->destination();
2396 CodeBlob* cb = CodeCache::find_blob(dest);
2397 if (cb != NULL) {
2398 st.print(" %s", cb->name());
2399 } else {
2400 ResourceMark rm;
2401 const int buflen = 1024;
2402 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2403 int offset;
2404 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2405 st.print(" %s", buf);
2406 if (offset != 0) {
2407 st.print("+%d", offset);
2408 }
2409 }
2410 }
2411 return st.as_string();
2412 }
2413 case relocInfo::virtual_call_type: {
2414 stringStream st;
2415 st.print_raw("virtual_call");
2416 virtual_call_Relocation* r = iter.virtual_call_reloc();
2417 Method* m = r->method_value();
2418 if (m != NULL) {
2419 assert(m->is_method(), "");
2420 m->print_short_name(&st);
2421 }
2422 return st.as_string();
2423 }
2424 case relocInfo::opt_virtual_call_type: {
2425 stringStream st;
2426 st.print_raw("optimized virtual_call");
2427 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2428 Method* m = r->method_value();
2429 if (m != NULL) {
2430 assert(m->is_method(), "");
2431 m->print_short_name(&st);
2432 }
2433 return st.as_string();
2434 }
2435 case relocInfo::static_call_type: {
2436 stringStream st;
2437 st.print_raw("static_call");
2438 static_call_Relocation* r = iter.static_call_reloc();
2439 Method* m = r->method_value();
2440 if (m != NULL) {
2441 assert(m->is_method(), "");
2442 m->print_short_name(&st);
2443 }
2444 return st.as_string();
2445 }
2446 case relocInfo::static_stub_type: return "static_stub";
2447 case relocInfo::external_word_type: return "external_word";
2448 case relocInfo::internal_word_type: return "internal_word";
2449 case relocInfo::section_word_type: return "section_word";
2450 case relocInfo::poll_type: return "poll";
2451 case relocInfo::poll_return_type: return "poll_return";
2452 case relocInfo::type_mask: return "type_bit_mask";
2453
2454 default:
2455 break;
2456 }
2457 }
2458 return have_one ? "other" : NULL;
2459 }
2460
2461 // Return a the last scope in (begin..end]
2462 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2463 PcDesc* p = pc_desc_near(begin+1);
2464 if (p != NULL && p->real_pc(this) <= end) {
2465 return new ScopeDesc(this, p->scope_decode_offset(),
2466 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2467 p->return_oop());
2468 }
2469 return NULL;
2470 }
2471
2472 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2473 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2474 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2475 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2476 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2477 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2478
2479 if (has_method_handle_invokes())
2480 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2481
2482 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2483
2484 if (block_begin == entry_point()) {
2485 methodHandle m = method();
2486 if (m.not_null()) {
2487 stream->print(" # ");
2488 m->print_value_on(stream);
2489 stream->cr();
2490 }
2491 if (m.not_null() && !is_osr_method()) {
2492 ResourceMark rm;
2493 int sizeargs = m->size_of_parameters();
2494 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2495 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2496 {
2497 int sig_index = 0;
2498 if (!m->is_static())
2499 sig_bt[sig_index++] = T_OBJECT; // 'this'
2500 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2501 BasicType t = ss.type();
2502 sig_bt[sig_index++] = t;
2503 if (type2size[t] == 2) {
2504 sig_bt[sig_index++] = T_VOID;
2505 } else {
2506 assert(type2size[t] == 1, "size is 1 or 2");
2507 }
2508 }
2509 assert(sig_index == sizeargs, "");
2510 }
2511 const char* spname = "sp"; // make arch-specific?
2512 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2513 int stack_slot_offset = this->frame_size() * wordSize;
2514 int tab1 = 14, tab2 = 24;
2515 int sig_index = 0;
2516 int arg_index = (m->is_static() ? 0 : -1);
2517 bool did_old_sp = false;
2518 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2519 bool at_this = (arg_index == -1);
2520 bool at_old_sp = false;
2521 BasicType t = (at_this ? T_OBJECT : ss.type());
2522 assert(t == sig_bt[sig_index], "sigs in sync");
2523 if (at_this)
2524 stream->print(" # this: ");
2525 else
2526 stream->print(" # parm%d: ", arg_index);
2527 stream->move_to(tab1);
2528 VMReg fst = regs[sig_index].first();
2529 VMReg snd = regs[sig_index].second();
2530 if (fst->is_reg()) {
2531 stream->print("%s", fst->name());
2532 if (snd->is_valid()) {
2533 stream->print(":%s", snd->name());
2534 }
2535 } else if (fst->is_stack()) {
2536 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2537 if (offset == stack_slot_offset) at_old_sp = true;
2538 stream->print("[%s+0x%x]", spname, offset);
2539 } else {
2540 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2541 }
2542 stream->print(" ");
2543 stream->move_to(tab2);
2544 stream->print("= ");
2545 if (at_this) {
2546 m->method_holder()->print_value_on(stream);
2547 } else {
2548 bool did_name = false;
2549 if (!at_this && ss.is_object()) {
2550 Symbol* name = ss.as_symbol_or_null();
2551 if (name != NULL) {
2552 name->print_value_on(stream);
2553 did_name = true;
2554 }
2555 }
2556 if (!did_name)
2557 stream->print("%s", type2name(t));
2558 }
2559 if (at_old_sp) {
2560 stream->print(" (%s of caller)", spname);
2561 did_old_sp = true;
2562 }
2563 stream->cr();
2564 sig_index += type2size[t];
2565 arg_index += 1;
2566 if (!at_this) ss.next();
2567 }
2568 if (!did_old_sp) {
2569 stream->print(" # ");
2570 stream->move_to(tab1);
2571 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2572 stream->print(" (%s of caller)", spname);
2573 stream->cr();
2574 }
2575 }
2576 }
2577 }
2578
2579 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2580 // First, find an oopmap in (begin, end].
2581 // We use the odd half-closed interval so that oop maps and scope descs
2582 // which are tied to the byte after a call are printed with the call itself.
2583 address base = code_begin();
2584 ImmutableOopMapSet* oms = oop_maps();
2585 if (oms != NULL) {
2586 for (int i = 0, imax = oms->count(); i < imax; i++) {
2587 const ImmutableOopMapPair* pair = oms->pair_at(i);
2588 const ImmutableOopMap* om = pair->get_from(oms);
2589 address pc = base + pair->pc_offset();
2590 if (pc > begin) {
2591 if (pc <= end) {
2592 st->move_to(column);
2593 st->print("; ");
2594 om->print_on(st);
2595 }
2596 break;
2597 }
2598 }
2599 }
2600
2601 // Print any debug info present at this pc.
2602 ScopeDesc* sd = scope_desc_in(begin, end);
2603 if (sd != NULL) {
2604 st->move_to(column);
2605 if (sd->bci() == SynchronizationEntryBCI) {
2606 st->print(";*synchronization entry");
2607 } else {
2608 if (sd->method() == NULL) {
2609 st->print("method is NULL");
2610 } else if (sd->method()->is_native()) {
2611 st->print("method is native");
2612 } else {
2613 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2614 st->print(";*%s", Bytecodes::name(bc));
2615 switch (bc) {
2616 case Bytecodes::_invokevirtual:
2617 case Bytecodes::_invokespecial:
2618 case Bytecodes::_invokestatic:
2619 case Bytecodes::_invokeinterface:
2620 {
2621 Bytecode_invoke invoke(sd->method(), sd->bci());
2622 st->print(" ");
2623 if (invoke.name() != NULL)
2624 invoke.name()->print_symbol_on(st);
2625 else
2626 st->print("<UNKNOWN>");
2627 break;
2628 }
2629 case Bytecodes::_getfield:
2630 case Bytecodes::_putfield:
2631 case Bytecodes::_getstatic:
2632 case Bytecodes::_putstatic:
2633 {
2634 Bytecode_field field(sd->method(), sd->bci());
2635 st->print(" ");
2636 if (field.name() != NULL)
2637 field.name()->print_symbol_on(st);
2638 else
2639 st->print("<UNKNOWN>");
2640 }
2641 default:
2642 break;
2643 }
2644 }
2645 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2646 }
2647
2648 // Print all scopes
2649 for (;sd != NULL; sd = sd->sender()) {
2650 st->move_to(column);
2651 st->print("; -");
2652 if (sd->method() == NULL) {
2653 st->print("method is NULL");
2654 } else {
2655 sd->method()->print_short_name(st);
2656 }
2657 int lineno = sd->method()->line_number_from_bci(sd->bci());
2658 if (lineno != -1) {
2659 st->print("@%d (line %d)", sd->bci(), lineno);
2660 } else {
2661 st->print("@%d", sd->bci());
2662 }
2663 st->cr();
2664 }
2665 }
2666
2667 // Print relocation information
2668 const char* str = reloc_string_for(begin, end);
2669 if (str != NULL) {
2670 if (sd != NULL) st->cr();
2671 st->move_to(column);
2672 st->print("; {%s}", str);
2673 }
2674 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2675 if (cont_offset != 0) {
2676 st->move_to(column);
2677 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2678 }
2679
2680 }
2681
2682 class DirectNativeCallWrapper: public NativeCallWrapper {
2683 private:
2684 NativeCall* _call;
2685
2686 public:
2687 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2688
2689 virtual address destination() const { return _call->destination(); }
2690 virtual address instruction_address() const { return _call->instruction_address(); }
2691 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2692 virtual address return_address() const { return _call->return_address(); }
2693
2694 virtual address get_resolve_call_stub(bool is_optimized) const {
2695 if (is_optimized) {
2696 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2697 }
2698 return SharedRuntime::get_resolve_virtual_call_stub();
2699 }
2700
2701 virtual void set_destination_mt_safe(address dest) {
2702 #if INCLUDE_AOT
2703 if (UseAOT) {
2704 CodeBlob* callee = CodeCache::find_blob(dest);
2705 CompiledMethod* cm = callee->as_compiled_method_or_null();
2706 if (cm != NULL && cm->is_far_code()) {
2707 // Temporary fix, see JDK-8143106
2708 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2709 csc->set_to_far(methodHandle(cm->method()), dest);
2710 return;
2711 }
2712 }
2713 #endif
2714 _call->set_destination_mt_safe(dest);
2715 }
2716
2717 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2718 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2719 #if INCLUDE_AOT
2720 if (info.to_aot()) {
2721 csc->set_to_far(method, info.entry());
2722 } else
2723 #endif
2724 {
2725 csc->set_to_interpreted(method, info.entry());
2726 }
2727 }
2728
2729 virtual void verify() const {
2730 // make sure code pattern is actually a call imm32 instruction
2731 _call->verify();
2732 if (os::is_MP()) {
2733 _call->verify_alignment();
2734 }
2735 }
2736
2737 virtual void verify_resolve_call(address dest) const {
2738 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2739 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2740 }
2741
2742 virtual bool is_call_to_interpreted(address dest) const {
2743 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2744 return cb->contains(dest);
2745 }
2746
2747 virtual bool is_safe_for_patching() const { return false; }
2748
2749 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2750 return nativeMovConstReg_at(r->cached_value());
2751 }
2752
2753 virtual void *get_data(NativeInstruction* instruction) const {
2754 return (void*)((NativeMovConstReg*) instruction)->data();
2755 }
2756
2757 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2758 ((NativeMovConstReg*) instruction)->set_data(data);
2759 }
2760 };
2761
2762 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2763 return new DirectNativeCallWrapper((NativeCall*) call);
2764 }
2765
2766 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2767 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2768 }
2769
2770 address nmethod::call_instruction_address(address pc) const {
2771 if (NativeCall::is_call_before(pc)) {
2772 NativeCall *ncall = nativeCall_before(pc);
2773 return ncall->instruction_address();
2774 }
2775 return NULL;
2776 }
2777
2778 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2779 return CompiledDirectStaticCall::at(call_site);
2780 }
2781
2782 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2783 return CompiledDirectStaticCall::at(call_site);
2784 }
2785
2786 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2787 return CompiledDirectStaticCall::before(return_addr);
2788 }
2789
2790 #ifndef PRODUCT
2791
2792 void nmethod::print_value_on(outputStream* st) const {
2793 st->print("nmethod");
2794 print_on(st, NULL);
2795 }
2796
2797 void nmethod::print_calls(outputStream* st) {
2798 RelocIterator iter(this);
2799 while (iter.next()) {
2800 switch (iter.type()) {
2801 case relocInfo::virtual_call_type:
2802 case relocInfo::opt_virtual_call_type: {
2803 VerifyMutexLocker mc(CompiledIC_lock);
2804 CompiledIC_at(&iter)->print();
2805 break;
2806 }
2807 case relocInfo::static_call_type:
2808 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2809 CompiledDirectStaticCall::at(iter.reloc())->print();
2810 break;
2811 default:
2812 break;
2813 }
2814 }
2815 }
2816
2817 void nmethod::print_handler_table() {
2818 ExceptionHandlerTable(this).print();
2819 }
2820
2821 void nmethod::print_nul_chk_table() {
2822 ImplicitExceptionTable(this).print(code_begin());
2823 }
2824
2825 void nmethod::print_statistics() {
2826 ttyLocker ttyl;
2827 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2828 native_nmethod_stats.print_native_nmethod_stats();
2829 #ifdef COMPILER1
2830 c1_java_nmethod_stats.print_nmethod_stats("C1");
2831 #endif
2832 #ifdef COMPILER2
2833 c2_java_nmethod_stats.print_nmethod_stats("C2");
2834 #endif
2835 #if INCLUDE_JVMCI
2836 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2837 #endif
2838 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2839 DebugInformationRecorder::print_statistics();
2840 #ifndef PRODUCT
2841 pc_nmethod_stats.print_pc_stats();
2842 #endif
2843 Dependencies::print_statistics();
2844 if (xtty != NULL) xtty->tail("statistics");
2845 }
2846
2847 #endif // !PRODUCT
2848
2849 #if INCLUDE_JVMCI
2850 void nmethod::clear_jvmci_installed_code() {
2851 assert_locked_or_safepoint(Patching_lock);
2852 if (_jvmci_installed_code != NULL) {
2853 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2854 _jvmci_installed_code = NULL;
2855 }
2856 }
2857
2858 void nmethod::clear_speculation_log() {
2859 assert_locked_or_safepoint(Patching_lock);
2860 if (_speculation_log != NULL) {
2861 JNIHandles::destroy_weak_global(_speculation_log);
2862 _speculation_log = NULL;
2863 }
2864 }
2865
2866 void nmethod::maybe_invalidate_installed_code() {
2867 assert(Patching_lock->is_locked() ||
2868 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2869 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2870 if (installed_code != NULL) {
2871 // Update the values in the InstalledCode instance if it still refers to this nmethod
2872 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2873 if (nm == this) {
2874 if (!is_alive()) {
2875 // Break the link between nmethod and InstalledCode such that the nmethod
2876 // can subsequently be flushed safely. The link must be maintained while
2877 // the method could have live activations since invalidateInstalledCode
2878 // might want to invalidate all existing activations.
2879 InstalledCode::set_address(installed_code, 0);
2880 InstalledCode::set_entryPoint(installed_code, 0);
2881 } else if (is_not_entrant()) {
2882 // Remove the entry point so any invocation will fail but keep
2883 // the address link around that so that existing activations can
2884 // be invalidated.
2885 InstalledCode::set_entryPoint(installed_code, 0);
2886 }
2887 }
2888 }
2889 if (!is_alive()) {
2890 // Clear these out after the nmethod has been unregistered and any
2891 // updates to the InstalledCode instance have been performed.
2892 clear_jvmci_installed_code();
2893 clear_speculation_log();
2894 }
2895 }
2896
2897 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2898 if (installedCode() == NULL) {
2899 THROW(vmSymbols::java_lang_NullPointerException());
2900 }
2901 jlong nativeMethod = InstalledCode::address(installedCode);
2902 nmethod* nm = (nmethod*)nativeMethod;
2903 if (nm == NULL) {
2904 // Nothing to do
2905 return;
2906 }
2907
2908 nmethodLocker nml(nm);
2909 #ifdef ASSERT
2910 {
2911 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2912 // This relationship can only be checked safely under a lock
2913 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2914 }
2915 #endif
2916
2917 if (nm->is_alive()) {
2918 // Invalidating the InstalledCode means we want the nmethod
2919 // to be deoptimized.
2920 nm->mark_for_deoptimization();
2921 VM_Deoptimize op;
2922 VMThread::execute(&op);
2923 }
2924
2925 // Multiple threads could reach this point so we now need to
2926 // lock and re-check the link to the nmethod so that only one
2927 // thread clears it.
2928 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2929 if (InstalledCode::address(installedCode) == nativeMethod) {
2930 InstalledCode::set_address(installedCode, 0);
2931 }
2932 }
2933
2934 oop nmethod::jvmci_installed_code() {
2935 return JNIHandles::resolve(_jvmci_installed_code);
2936 }
2937
2938 oop nmethod::speculation_log() {
2939 return JNIHandles::resolve(_speculation_log);
2940 }
2941
2942 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2943 if (!this->is_compiled_by_jvmci()) {
2944 return NULL;
2945 }
2946 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2947 if (installed_code != NULL) {
2948 oop installed_code_name = NULL;
2949 if (installed_code->is_a(InstalledCode::klass())) {
2950 installed_code_name = InstalledCode::name(installed_code);
2951 }
2952 if (installed_code_name != NULL) {
2953 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2954 }
2955 }
2956 return NULL;
2957 }
2958 #endif