1 /*
2 * Copyright (c) 1997, 2019, 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 "asm/assembler.inline.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/compiledMethod.inline.hpp"
31 #include "code/dependencies.hpp"
32 #include "code/nativeInst.hpp"
33 #include "code/nmethod.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/access.inline.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "runtime/atomic.hpp"
52 #include "runtime/flags/flagSetting.hpp"
53 #include "runtime/frame.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/jniHandles.inline.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepointVerifiers.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/sweeper.hpp"
61 #include "runtime/vmThread.hpp"
62 #include "utilities/align.hpp"
63 #include "utilities/dtrace.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/resourceHash.hpp"
66 #include "utilities/xmlstream.hpp"
67 #if INCLUDE_JVMCI
68 #include "jvmci/jvmciJavaClasses.hpp"
69 #endif
70
71 #ifdef DTRACE_ENABLED
72
73 // Only bother with this argument setup if dtrace is available
74
75 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
76 { \
77 Method* m = (method); \
78 if (m != NULL) { \
79 Symbol* klass_name = m->klass_name(); \
80 Symbol* name = m->name(); \
81 Symbol* signature = m->signature(); \
82 HOTSPOT_COMPILED_METHOD_UNLOAD( \
83 (char *) klass_name->bytes(), klass_name->utf8_length(), \
84 (char *) name->bytes(), name->utf8_length(), \
85 (char *) signature->bytes(), signature->utf8_length()); \
86 } \
87 }
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_UNLOAD_PROBE(method)
92
93 #endif
94
95 //---------------------------------------------------------------------------------
96 // NMethod statistics
97 // They are printed under various flags, including:
98 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
99 // (In the latter two cases, they like other stats are printed to the log only.)
100
101 #ifndef PRODUCT
102 // These variables are put into one block to reduce relocations
103 // and make it simpler to print from the debugger.
104 struct java_nmethod_stats_struct {
105 int nmethod_count;
106 int total_size;
107 int relocation_size;
108 int consts_size;
109 int insts_size;
110 int stub_size;
111 int scopes_data_size;
112 int scopes_pcs_size;
113 int dependencies_size;
114 int handler_table_size;
115 int nul_chk_table_size;
116 int oops_size;
117 int metadata_size;
118
119 void note_nmethod(nmethod* nm) {
120 nmethod_count += 1;
121 total_size += nm->size();
122 relocation_size += nm->relocation_size();
123 consts_size += nm->consts_size();
124 insts_size += nm->insts_size();
125 stub_size += nm->stub_size();
126 oops_size += nm->oops_size();
127 metadata_size += nm->metadata_size();
128 scopes_data_size += nm->scopes_data_size();
129 scopes_pcs_size += nm->scopes_pcs_size();
130 dependencies_size += nm->dependencies_size();
131 handler_table_size += nm->handler_table_size();
132 nul_chk_table_size += nm->nul_chk_table_size();
133 }
134 void print_nmethod_stats(const char* name) {
135 if (nmethod_count == 0) return;
136 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
137 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
138 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
139 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
140 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
141 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
142 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
143 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
144 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
145 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
146 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
147 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
148 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
149 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
150 }
151 };
152
153 struct native_nmethod_stats_struct {
154 int native_nmethod_count;
155 int native_total_size;
156 int native_relocation_size;
157 int native_insts_size;
158 int native_oops_size;
159 int native_metadata_size;
160 void note_native_nmethod(nmethod* nm) {
161 native_nmethod_count += 1;
162 native_total_size += nm->size();
163 native_relocation_size += nm->relocation_size();
164 native_insts_size += nm->insts_size();
165 native_oops_size += nm->oops_size();
166 native_metadata_size += nm->metadata_size();
167 }
168 void print_native_nmethod_stats() {
169 if (native_nmethod_count == 0) return;
170 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
171 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
172 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
173 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
174 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
175 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
176 }
177 };
178
179 struct pc_nmethod_stats_struct {
180 int pc_desc_resets; // number of resets (= number of caches)
181 int pc_desc_queries; // queries to nmethod::find_pc_desc
182 int pc_desc_approx; // number of those which have approximate true
183 int pc_desc_repeats; // number of _pc_descs[0] hits
184 int pc_desc_hits; // number of LRU cache hits
185 int pc_desc_tests; // total number of PcDesc examinations
186 int pc_desc_searches; // total number of quasi-binary search steps
187 int pc_desc_adds; // number of LUR cache insertions
188
189 void print_pc_stats() {
190 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
191 pc_desc_queries,
192 (double)(pc_desc_tests + pc_desc_searches)
193 / pc_desc_queries);
194 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
195 pc_desc_resets,
196 pc_desc_queries, pc_desc_approx,
197 pc_desc_repeats, pc_desc_hits,
198 pc_desc_tests, pc_desc_searches, pc_desc_adds);
199 }
200 };
201
202 #ifdef COMPILER1
203 static java_nmethod_stats_struct c1_java_nmethod_stats;
204 #endif
205 #ifdef COMPILER2
206 static java_nmethod_stats_struct c2_java_nmethod_stats;
207 #endif
208 #if INCLUDE_JVMCI
209 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
210 #endif
211 static java_nmethod_stats_struct unknown_java_nmethod_stats;
212
213 static native_nmethod_stats_struct native_nmethod_stats;
214 static pc_nmethod_stats_struct pc_nmethod_stats;
215
216 static void note_java_nmethod(nmethod* nm) {
217 #ifdef COMPILER1
218 if (nm->is_compiled_by_c1()) {
219 c1_java_nmethod_stats.note_nmethod(nm);
220 } else
221 #endif
222 #ifdef COMPILER2
223 if (nm->is_compiled_by_c2()) {
224 c2_java_nmethod_stats.note_nmethod(nm);
225 } else
226 #endif
227 #if INCLUDE_JVMCI
228 if (nm->is_compiled_by_jvmci()) {
229 jvmci_java_nmethod_stats.note_nmethod(nm);
230 } else
231 #endif
232 {
233 unknown_java_nmethod_stats.note_nmethod(nm);
234 }
235 }
236 #endif // !PRODUCT
237
238 //---------------------------------------------------------------------------------
239
240
241 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
242 assert(pc != NULL, "Must be non null");
243 assert(exception.not_null(), "Must be non null");
244 assert(handler != NULL, "Must be non null");
245
246 _count = 0;
247 _exception_type = exception->klass();
248 _next = NULL;
249 _purge_list_next = NULL;
250
251 add_address_and_handler(pc,handler);
252 }
253
254
255 address ExceptionCache::match(Handle exception, address pc) {
256 assert(pc != NULL,"Must be non null");
257 assert(exception.not_null(),"Must be non null");
258 if (exception->klass() == exception_type()) {
259 return (test_address(pc));
260 }
261
262 return NULL;
263 }
264
265
266 bool ExceptionCache::match_exception_with_space(Handle exception) {
267 assert(exception.not_null(),"Must be non null");
268 if (exception->klass() == exception_type() && count() < cache_size) {
269 return true;
270 }
271 return false;
272 }
273
274
275 address ExceptionCache::test_address(address addr) {
276 int limit = count();
277 for (int i = 0; i < limit; i++) {
278 if (pc_at(i) == addr) {
279 return handler_at(i);
280 }
281 }
282 return NULL;
283 }
284
285
286 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
287 if (test_address(addr) == handler) return true;
288
289 int index = count();
290 if (index < cache_size) {
291 set_pc_at(index, addr);
292 set_handler_at(index, handler);
293 increment_count();
294 return true;
295 }
296 return false;
297 }
298
299 ExceptionCache* ExceptionCache::next() {
300 return Atomic::load(&_next);
301 }
302
303 void ExceptionCache::set_next(ExceptionCache *ec) {
304 Atomic::store(ec, &_next);
305 }
306
307 //-----------------------------------------------------------------------------
308
309
310 // Helper used by both find_pc_desc methods.
311 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
313 if (!approximate)
314 return pc->pc_offset() == pc_offset;
315 else
316 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
317 }
318
319 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
320 if (initial_pc_desc == NULL) {
321 _pc_descs[0] = NULL; // native method; no PcDescs at all
322 return;
323 }
324 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
325 // reset the cache by filling it with benign (non-null) values
326 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
327 for (int i = 0; i < cache_size; i++)
328 _pc_descs[i] = initial_pc_desc;
329 }
330
331 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
332 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
333 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
334
335 // Note: one might think that caching the most recently
336 // read value separately would be a win, but one would be
337 // wrong. When many threads are updating it, the cache
338 // line it's in would bounce between caches, negating
339 // any benefit.
340
341 // In order to prevent race conditions do not load cache elements
342 // repeatedly, but use a local copy:
343 PcDesc* res;
344
345 // Step one: Check the most recently added value.
346 res = _pc_descs[0];
347 if (res == NULL) return NULL; // native method; no PcDescs at all
348 if (match_desc(res, pc_offset, approximate)) {
349 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
350 return res;
351 }
352
353 // Step two: Check the rest of the LRU cache.
354 for (int i = 1; i < cache_size; ++i) {
355 res = _pc_descs[i];
356 if (res->pc_offset() < 0) break; // optimization: skip empty cache
357 if (match_desc(res, pc_offset, approximate)) {
358 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
359 return res;
360 }
361 }
362
363 // Report failure.
364 return NULL;
365 }
366
367 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
368 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
369 // Update the LRU cache by shifting pc_desc forward.
370 for (int i = 0; i < cache_size; i++) {
371 PcDesc* next = _pc_descs[i];
372 _pc_descs[i] = pc_desc;
373 pc_desc = next;
374 }
375 }
376
377 // adjust pcs_size so that it is a multiple of both oopSize and
378 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
379 // of oopSize, then 2*sizeof(PcDesc) is)
380 static int adjust_pcs_size(int pcs_size) {
381 int nsize = align_up(pcs_size, oopSize);
382 if ((nsize % sizeof(PcDesc)) != 0) {
383 nsize = pcs_size + sizeof(PcDesc);
384 }
385 assert((nsize % oopSize) == 0, "correct alignment");
386 return nsize;
387 }
388
389
390 int nmethod::total_size() const {
391 return
392 consts_size() +
393 insts_size() +
394 stub_size() +
395 scopes_data_size() +
396 scopes_pcs_size() +
397 handler_table_size() +
398 nul_chk_table_size();
399 }
400
401 address* nmethod::orig_pc_addr(const frame* fr) {
402 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
403 }
404
405 const char* nmethod::compile_kind() const {
406 if (is_osr_method()) return "osr";
407 if (method() != NULL && is_native_method()) return "c2n";
408 return NULL;
409 }
410
411 // Fill in default values for various flag fields
412 void nmethod::init_defaults() {
413 _state = not_installed;
414 _has_flushed_dependencies = 0;
415 _lock_count = 0;
416 _stack_traversal_mark = 0;
417 _unload_reported = false; // jvmti state
418 _is_far_code = false; // nmethods are located in CodeCache
419
420 #ifdef ASSERT
421 _oops_are_stale = false;
422 #endif
423
424 _oops_do_mark_link = NULL;
425 _jmethod_id = NULL;
426 _osr_link = NULL;
427 #if INCLUDE_RTM_OPT
428 _rtm_state = NoRTM;
429 #endif
430 #if INCLUDE_JVMCI
431 _jvmci_installed_code = NULL;
432 _speculation_log = NULL;
433 _jvmci_installed_code_triggers_invalidation = false;
434 #endif
435 }
436
437 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
438 int compile_id,
439 CodeBuffer *code_buffer,
440 int vep_offset,
441 int frame_complete,
442 int frame_size,
443 ByteSize basic_lock_owner_sp_offset,
444 ByteSize basic_lock_sp_offset,
445 OopMapSet* oop_maps) {
446 code_buffer->finalize_oop_references(method);
447 // create nmethod
448 nmethod* nm = NULL;
449 {
450 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
451 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
452
453 CodeOffsets offsets;
454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
456 nm = new (native_nmethod_size, CompLevel_none)
457 nmethod(method(), compiler_none, native_nmethod_size,
458 compile_id, &offsets,
459 code_buffer, frame_size,
460 basic_lock_owner_sp_offset,
461 basic_lock_sp_offset,
462 oop_maps);
463 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
464 }
465
466 if (nm != NULL) {
467 // verify nmethod
468 debug_only(nm->verify();) // might block
469
470 nm->log_new_nmethod();
471 nm->make_in_use();
472 }
473 return nm;
474 }
475
476 nmethod* nmethod::new_nmethod(const methodHandle& method,
477 int compile_id,
478 int entry_bci,
479 CodeOffsets* offsets,
480 int orig_pc_offset,
481 DebugInformationRecorder* debug_info,
482 Dependencies* dependencies,
483 CodeBuffer* code_buffer, int frame_size,
484 OopMapSet* oop_maps,
485 ExceptionHandlerTable* handler_table,
486 ImplicitExceptionTable* nul_chk_table,
487 AbstractCompiler* compiler,
488 int comp_level
489 #if INCLUDE_JVMCI
490 , jweak installed_code,
491 jweak speculationLog
492 #endif
493 )
494 {
495 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
496 code_buffer->finalize_oop_references(method);
497 // create nmethod
498 nmethod* nm = NULL;
499 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
500 int nmethod_size =
501 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
502 + adjust_pcs_size(debug_info->pcs_size())
503 + align_up((int)dependencies->size_in_bytes(), oopSize)
504 + align_up(handler_table->size_in_bytes() , oopSize)
505 + align_up(nul_chk_table->size_in_bytes() , oopSize)
506 + align_up(debug_info->data_size() , oopSize);
507
508 nm = new (nmethod_size, comp_level)
509 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
510 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
511 oop_maps,
512 handler_table,
513 nul_chk_table,
514 compiler,
515 comp_level
516 #if INCLUDE_JVMCI
517 , installed_code,
518 speculationLog
519 #endif
520 );
521
522 if (nm != NULL) {
523 // To make dependency checking during class loading fast, record
524 // the nmethod dependencies in the classes it is dependent on.
525 // This allows the dependency checking code to simply walk the
526 // class hierarchy above the loaded class, checking only nmethods
527 // which are dependent on those classes. The slow way is to
528 // check every nmethod for dependencies which makes it linear in
529 // the number of methods compiled. For applications with a lot
530 // classes the slow way is too slow.
531 for (Dependencies::DepStream deps(nm); deps.next(); ) {
532 if (deps.type() == Dependencies::call_site_target_value) {
533 // CallSite dependencies are managed on per-CallSite instance basis.
534 oop call_site = deps.argument_oop(0);
535 MethodHandles::add_dependent_nmethod(call_site, nm);
536 } else {
537 Klass* klass = deps.context_type();
538 if (klass == NULL) {
539 continue; // ignore things like evol_method
540 }
541 // record this nmethod as dependent on this klass
542 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
543 }
544 }
545 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
546 }
547 }
548 // Do verification and logging outside CodeCache_lock.
549 if (nm != NULL) {
550 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
551 DEBUG_ONLY(nm->verify();)
552 nm->log_new_nmethod();
553 }
554 return nm;
555 }
556
557 // For native wrappers
558 nmethod::nmethod(
559 Method* method,
560 CompilerType type,
561 int nmethod_size,
562 int compile_id,
563 CodeOffsets* offsets,
564 CodeBuffer* code_buffer,
565 int frame_size,
566 ByteSize basic_lock_owner_sp_offset,
567 ByteSize basic_lock_sp_offset,
568 OopMapSet* oop_maps )
569 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
570 _is_unloading_state(0),
571 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
572 _native_basic_lock_sp_offset(basic_lock_sp_offset)
573 {
574 {
575 int scopes_data_offset = 0;
576 int deoptimize_offset = 0;
577 int deoptimize_mh_offset = 0;
578
579 debug_only(NoSafepointVerifier nsv;)
580 assert_locked_or_safepoint(CodeCache_lock);
581
582 init_defaults();
583 _entry_bci = InvocationEntryBci;
584 // We have no exception handler or deopt handler make the
585 // values something that will never match a pc like the nmethod vtable entry
586 _exception_offset = 0;
587 _orig_pc_offset = 0;
588
589 _consts_offset = data_offset();
590 _stub_offset = data_offset();
591 _oops_offset = data_offset();
592 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
593 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
594 _scopes_pcs_offset = scopes_data_offset;
595 _dependencies_offset = _scopes_pcs_offset;
596 _handler_table_offset = _dependencies_offset;
597 _nul_chk_table_offset = _handler_table_offset;
598 _nmethod_end_offset = _nul_chk_table_offset;
599 _compile_id = compile_id;
600 _comp_level = CompLevel_none;
601 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
602 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
603 _osr_entry_point = NULL;
604 _exception_cache = NULL;
605 _pc_desc_container.reset_to(NULL);
606 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
607
608 _scopes_data_begin = (address) this + scopes_data_offset;
609 _deopt_handler_begin = (address) this + deoptimize_offset;
610 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
611
612 code_buffer->copy_code_and_locs_to(this);
613 code_buffer->copy_values_to(this);
614
615 clear_unloading_state();
616
617 Universe::heap()->register_nmethod(this);
618 debug_only(Universe::heap()->verify_nmethod(this));
619
620 CodeCache::commit(this);
621 }
622
623 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
624 ttyLocker ttyl; // keep the following output all in one block
625 // This output goes directly to the tty, not the compiler log.
626 // To enable tools to match it up with the compilation activity,
627 // be sure to tag this tty output with the compile ID.
628 if (xtty != NULL) {
629 xtty->begin_head("print_native_nmethod");
630 xtty->method(_method);
631 xtty->stamp();
632 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
633 }
634 // Print the header part, then print the requested information.
635 // This is both handled in decode2(), called via print_code() -> decode()
636 if (PrintNativeNMethods) {
637 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
638 print_code();
639 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
640 #if defined(SUPPORT_DATA_STRUCTS)
641 if (AbstractDisassembler::show_structs()) {
642 if (oop_maps != NULL) {
643 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
644 oop_maps->print_on(tty);
645 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
646 }
647 }
648 #endif
649 } else {
650 print(); // print the header part only.
651 }
652 #if defined(SUPPORT_DATA_STRUCTS)
653 if (AbstractDisassembler::show_structs()) {
654 if (PrintRelocations) {
655 print_relocations();
656 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
657 }
658 }
659 #endif
660 if (xtty != NULL) {
661 xtty->tail("print_native_nmethod");
662 }
663 }
664 }
665
666 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
667 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
668 }
669
670 nmethod::nmethod(
671 Method* method,
672 CompilerType type,
673 int nmethod_size,
674 int compile_id,
675 int entry_bci,
676 CodeOffsets* offsets,
677 int orig_pc_offset,
678 DebugInformationRecorder* debug_info,
679 Dependencies* dependencies,
680 CodeBuffer *code_buffer,
681 int frame_size,
682 OopMapSet* oop_maps,
683 ExceptionHandlerTable* handler_table,
684 ImplicitExceptionTable* nul_chk_table,
685 AbstractCompiler* compiler,
686 int comp_level
687 #if INCLUDE_JVMCI
688 , jweak installed_code,
689 jweak speculation_log
690 #endif
691 )
692 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
693 _is_unloading_state(0),
694 _native_receiver_sp_offset(in_ByteSize(-1)),
695 _native_basic_lock_sp_offset(in_ByteSize(-1))
696 {
697 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
698 {
699 debug_only(NoSafepointVerifier nsv;)
700 assert_locked_or_safepoint(CodeCache_lock);
701
702 _deopt_handler_begin = (address) this;
703 _deopt_mh_handler_begin = (address) this;
704
705 init_defaults();
706 _entry_bci = entry_bci;
707 _compile_id = compile_id;
708 _comp_level = comp_level;
709 _orig_pc_offset = orig_pc_offset;
710 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
711
712 // Section offsets
713 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
714 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
715 set_ctable_begin(header_begin() + _consts_offset);
716
717 #if INCLUDE_JVMCI
718 _jvmci_installed_code = installed_code;
719 _speculation_log = speculation_log;
720 oop obj = JNIHandles::resolve(installed_code);
721 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
722 _jvmci_installed_code_triggers_invalidation = false;
723 } else {
724 _jvmci_installed_code_triggers_invalidation = true;
725 }
726
727 if (compiler->is_jvmci()) {
728 // JVMCI might not produce any stub sections
729 if (offsets->value(CodeOffsets::Exceptions) != -1) {
730 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
731 } else {
732 _exception_offset = -1;
733 }
734 if (offsets->value(CodeOffsets::Deopt) != -1) {
735 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
736 } else {
737 _deopt_handler_begin = NULL;
738 }
739 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
740 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
741 } else {
742 _deopt_mh_handler_begin = NULL;
743 }
744 } else
745 #endif
746 {
747 // Exception handler and deopt handler are in the stub section
748 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
749 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
750
751 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
752 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
753 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
754 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
755 } else {
756 _deopt_mh_handler_begin = NULL;
757 }
758 }
759 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
760 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
761 } else {
762 _unwind_handler_offset = -1;
763 }
764
765 _oops_offset = data_offset();
766 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
767 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
768
769 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
770 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
771 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
772 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
773 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
774 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
775 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
776 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
777 _exception_cache = NULL;
778 _scopes_data_begin = (address) this + scopes_data_offset;
779
780 _pc_desc_container.reset_to(scopes_pcs_begin());
781
782 code_buffer->copy_code_and_locs_to(this);
783 // Copy contents of ScopeDescRecorder to nmethod
784 code_buffer->copy_values_to(this);
785 debug_info->copy_to(this);
786 dependencies->copy_to(this);
787 clear_unloading_state();
788
789 Universe::heap()->register_nmethod(this);
790 debug_only(Universe::heap()->verify_nmethod(this));
791
792 CodeCache::commit(this);
793
794 // Copy contents of ExceptionHandlerTable to nmethod
795 handler_table->copy_to(this);
796 nul_chk_table->copy_to(this);
797
798 // we use the information of entry points to find out if a method is
799 // static or non static
800 assert(compiler->is_c2() || compiler->is_jvmci() ||
801 _method->is_static() == (entry_point() == _verified_entry_point),
802 " entry points must be same for static methods and vice versa");
803 }
804 }
805
806 // Print a short set of xml attributes to identify this nmethod. The
807 // output should be embedded in some other element.
808 void nmethod::log_identity(xmlStream* log) const {
809 log->print(" compile_id='%d'", compile_id());
810 const char* nm_kind = compile_kind();
811 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
812 log->print(" compiler='%s'", compiler_name());
813 if (TieredCompilation) {
814 log->print(" level='%d'", comp_level());
815 }
816 #if INCLUDE_JVMCI
817 char buffer[O_BUFLEN];
818 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN);
819 if (jvmci_name != NULL) {
820 log->print(" jvmci_installed_code_name='");
821 log->text("%s", jvmci_name);
822 log->print("'");
823 }
824 #endif
825 }
826
827
828 #define LOG_OFFSET(log, name) \
829 if (p2i(name##_end()) - p2i(name##_begin())) \
830 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
831 p2i(name##_begin()) - p2i(this))
832
833
834 void nmethod::log_new_nmethod() const {
835 if (LogCompilation && xtty != NULL) {
836 ttyLocker ttyl;
837 HandleMark hm;
838 xtty->begin_elem("nmethod");
839 log_identity(xtty);
840 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
841 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
842
843 LOG_OFFSET(xtty, relocation);
844 LOG_OFFSET(xtty, consts);
845 LOG_OFFSET(xtty, insts);
846 LOG_OFFSET(xtty, stub);
847 LOG_OFFSET(xtty, scopes_data);
848 LOG_OFFSET(xtty, scopes_pcs);
849 LOG_OFFSET(xtty, dependencies);
850 LOG_OFFSET(xtty, handler_table);
851 LOG_OFFSET(xtty, nul_chk_table);
852 LOG_OFFSET(xtty, oops);
853 LOG_OFFSET(xtty, metadata);
854
855 xtty->method(method());
856 xtty->stamp();
857 xtty->end_elem();
858 }
859 }
860
861 #undef LOG_OFFSET
862
863
864 // Print out more verbose output usually for a newly created nmethod.
865 void nmethod::print_on(outputStream* st, const char* msg) const {
866 if (st != NULL) {
867 ttyLocker ttyl;
868 if (WizardMode) {
869 CompileTask::print(st, this, msg, /*short_form:*/ true);
870 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
871 } else {
872 CompileTask::print(st, this, msg, /*short_form:*/ false);
873 }
874 }
875 }
876
877 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
878 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
879 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
880 print_nmethod(printnmethods);
881 }
882 }
883
884 void nmethod::print_nmethod(bool printmethod) {
885 ttyLocker ttyl; // keep the following output all in one block
886 if (xtty != NULL) {
887 xtty->begin_head("print_nmethod");
888 xtty->stamp();
889 xtty->end_head();
890 }
891 // Print the header part, then print the requested information.
892 // This is both handled in decode2().
893 if (printmethod) {
894 HandleMark hm;
895 ResourceMark m;
896 if (is_compiled_by_c1()) {
897 tty->cr();
898 tty->print_cr("============================= C1-compiled nmethod ==============================");
899 }
900 if (is_compiled_by_jvmci()) {
901 tty->cr();
902 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
903 }
904 tty->print_cr("----------------------------------- Assembly -----------------------------------");
905 decode2(tty);
906 #if defined(SUPPORT_DATA_STRUCTS)
907 if (AbstractDisassembler::show_structs()) {
908 // Print the oops from the underlying CodeBlob as well.
909 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
910 print_oops(tty);
911 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
912 print_metadata(tty);
913 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
914 print_pcs();
915 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
916 if (oop_maps() != NULL) {
917 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
918 oop_maps()->print_on(tty);
919 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
920 }
921 }
922 #endif
923 } else {
924 print(); // print the header part only.
925 }
926
927 #if defined(SUPPORT_DATA_STRUCTS)
928 if (AbstractDisassembler::show_structs()) {
929 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
930 print_scopes();
931 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
932 }
933 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
934 print_relocations();
935 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
936 }
937 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
938 print_dependencies();
939 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
940 }
941 if (printmethod || PrintExceptionHandlers) {
942 print_handler_table();
943 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
944 print_nul_chk_table();
945 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
946 }
947
948 if (printmethod) {
949 print_recorded_oops();
950 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
951 print_recorded_metadata();
952 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
953 }
954 }
955 #endif
956
957 if (xtty != NULL) {
958 xtty->tail("print_nmethod");
959 }
960 }
961
962
963 // Promote one word from an assembly-time handle to a live embedded oop.
964 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
965 if (handle == NULL ||
966 // As a special case, IC oops are initialized to 1 or -1.
967 handle == (jobject) Universe::non_oop_word()) {
968 (*dest) = (oop) handle;
969 } else {
970 (*dest) = JNIHandles::resolve_non_null(handle);
971 }
972 }
973
974
975 // Have to have the same name because it's called by a template
976 void nmethod::copy_values(GrowableArray<jobject>* array) {
977 int length = array->length();
978 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
979 oop* dest = oops_begin();
980 for (int index = 0 ; index < length; index++) {
981 initialize_immediate_oop(&dest[index], array->at(index));
982 }
983
984 // Now we can fix up all the oops in the code. We need to do this
985 // in the code because the assembler uses jobjects as placeholders.
986 // The code and relocations have already been initialized by the
987 // CodeBlob constructor, so it is valid even at this early point to
988 // iterate over relocations and patch the code.
989 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
990 }
991
992 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
993 int length = array->length();
994 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
995 Metadata** dest = metadata_begin();
996 for (int index = 0 ; index < length; index++) {
997 dest[index] = array->at(index);
998 }
999 }
1000
1001 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1002 // re-patch all oop-bearing instructions, just in case some oops moved
1003 RelocIterator iter(this, begin, end);
1004 while (iter.next()) {
1005 if (iter.type() == relocInfo::oop_type) {
1006 oop_Relocation* reloc = iter.oop_reloc();
1007 if (initialize_immediates && reloc->oop_is_immediate()) {
1008 oop* dest = reloc->oop_addr();
1009 initialize_immediate_oop(dest, (jobject) *dest);
1010 }
1011 // Refresh the oop-related bits of this instruction.
1012 reloc->fix_oop_relocation();
1013 } else if (iter.type() == relocInfo::metadata_type) {
1014 metadata_Relocation* reloc = iter.metadata_reloc();
1015 reloc->fix_metadata_relocation();
1016 }
1017 }
1018 }
1019
1020
1021 void nmethod::verify_clean_inline_caches() {
1022 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1023
1024 ResourceMark rm;
1025 RelocIterator iter(this, oops_reloc_begin());
1026 while(iter.next()) {
1027 switch(iter.type()) {
1028 case relocInfo::virtual_call_type:
1029 case relocInfo::opt_virtual_call_type: {
1030 CompiledIC *ic = CompiledIC_at(&iter);
1031 // Ok, to lookup references to zombies here
1032 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1033 assert(cb != NULL, "destination not in CodeBlob?");
1034 nmethod* nm = cb->as_nmethod_or_null();
1035 if( nm != NULL ) {
1036 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1037 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1038 assert(ic->is_clean(), "IC should be clean");
1039 }
1040 }
1041 break;
1042 }
1043 case relocInfo::static_call_type: {
1044 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1045 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1046 assert(cb != NULL, "destination not in CodeBlob?");
1047 nmethod* nm = cb->as_nmethod_or_null();
1048 if( nm != NULL ) {
1049 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1050 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1051 assert(csc->is_clean(), "IC should be clean");
1052 }
1053 }
1054 break;
1055 }
1056 default:
1057 break;
1058 }
1059 }
1060 }
1061
1062 // This is a private interface with the sweeper.
1063 void nmethod::mark_as_seen_on_stack() {
1064 assert(is_alive(), "Must be an alive method");
1065 // Set the traversal mark to ensure that the sweeper does 2
1066 // cleaning passes before moving to zombie.
1067 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1068 }
1069
1070 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1071 // there are no activations on the stack, not in use by the VM,
1072 // and not in use by the ServiceThread)
1073 bool nmethod::can_convert_to_zombie() {
1074 // Note that this is called when the sweeper has observed the nmethod to be
1075 // not_entrant. However, with concurrent code cache unloading, the state
1076 // might have moved on to unloaded if it is_unloading(), due to racing
1077 // concurrent GC threads.
1078 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1079
1080 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1081 // count can be greater than the stack traversal count before it hits the
1082 // nmethod for the second time.
1083 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1084 // convert it to zombie due to GC unloading interactions. However, if it
1085 // has become unloaded, then it is okay to convert such nmethods to zombie.
1086 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1087 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1088 }
1089
1090 void nmethod::inc_decompile_count() {
1091 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1092 // Could be gated by ProfileTraps, but do not bother...
1093 Method* m = method();
1094 if (m == NULL) return;
1095 MethodData* mdo = m->method_data();
1096 if (mdo == NULL) return;
1097 // There is a benign race here. See comments in methodData.hpp.
1098 mdo->inc_decompile_count();
1099 }
1100
1101 void nmethod::make_unloaded() {
1102 post_compiled_method_unload();
1103
1104 // This nmethod is being unloaded, make sure that dependencies
1105 // recorded in instanceKlasses get flushed.
1106 // Since this work is being done during a GC, defer deleting dependencies from the
1107 // InstanceKlass.
1108 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1109 "should only be called during gc");
1110 flush_dependencies(/*delete_immediately*/false);
1111
1112 // Break cycle between nmethod & method
1113 LogTarget(Trace, class, unload, nmethod) lt;
1114 if (lt.is_enabled()) {
1115 LogStream ls(lt);
1116 ls.print("making nmethod " INTPTR_FORMAT
1117 " unloadable, Method*(" INTPTR_FORMAT
1118 ") ",
1119 p2i(this), p2i(_method));
1120 ls.cr();
1121 }
1122 // Unlink the osr method, so we do not look this up again
1123 if (is_osr_method()) {
1124 // Invalidate the osr nmethod only once
1125 if (is_in_use()) {
1126 invalidate_osr_method();
1127 }
1128 #ifdef ASSERT
1129 if (method() != NULL) {
1130 // Make sure osr nmethod is invalidated, i.e. not on the list
1131 bool found = method()->method_holder()->remove_osr_nmethod(this);
1132 assert(!found, "osr nmethod should have been invalidated");
1133 }
1134 #endif
1135 }
1136
1137 // If _method is already NULL the Method* is about to be unloaded,
1138 // so we don't have to break the cycle. Note that it is possible to
1139 // have the Method* live here, in case we unload the nmethod because
1140 // it is pointing to some oop (other than the Method*) being unloaded.
1141 if (_method != NULL) {
1142 // OSR methods point to the Method*, but the Method* does not
1143 // point back!
1144 if (_method->code() == this) {
1145 _method->clear_code(); // Break a cycle
1146 }
1147 }
1148
1149 // Make the class unloaded - i.e., change state and notify sweeper
1150 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1151 "must be at safepoint");
1152
1153 {
1154 // Clear ICStubs and release any CompiledICHolders.
1155 CompiledICLocker ml(this);
1156 clear_ic_callsites();
1157 }
1158
1159 // Unregister must be done before the state change
1160 {
1161 MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1162 Mutex::_no_safepoint_check_flag);
1163 Universe::heap()->unregister_nmethod(this);
1164 CodeCache::unregister_old_nmethod(this);
1165 }
1166
1167 // Clear the method of this dead nmethod
1168 set_method(NULL);
1169
1170 // Log the unloading.
1171 log_state_change();
1172
1173 #if INCLUDE_JVMCI
1174 // The method can only be unloaded after the pointer to the installed code
1175 // Java wrapper is no longer alive. Here we need to clear out this weak
1176 // reference to the dead object.
1177 maybe_invalidate_installed_code();
1178 #endif
1179
1180 // The Method* is gone at this point
1181 assert(_method == NULL, "Tautology");
1182
1183 set_osr_link(NULL);
1184 NMethodSweeper::report_state_change(this);
1185
1186 // The release is only needed for compile-time ordering, as accesses
1187 // into the nmethod after the store are not safe due to the sweeper
1188 // being allowed to free it when the store is observed, during
1189 // concurrent nmethod unloading. Therefore, there is no need for
1190 // acquire on the loader side.
1191 OrderAccess::release_store(&_state, (signed char)unloaded);
1192 }
1193
1194 void nmethod::invalidate_osr_method() {
1195 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1196 // Remove from list of active nmethods
1197 if (method() != NULL) {
1198 method()->method_holder()->remove_osr_nmethod(this);
1199 }
1200 }
1201
1202 void nmethod::log_state_change() const {
1203 if (LogCompilation) {
1204 if (xtty != NULL) {
1205 ttyLocker ttyl; // keep the following output all in one block
1206 if (_state == unloaded) {
1207 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1208 os::current_thread_id());
1209 } else {
1210 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1211 os::current_thread_id(),
1212 (_state == zombie ? " zombie='1'" : ""));
1213 }
1214 log_identity(xtty);
1215 xtty->stamp();
1216 xtty->end_elem();
1217 }
1218 }
1219
1220 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1221 CompileTask::print_ul(this, state_msg);
1222 if (PrintCompilation && _state != unloaded) {
1223 print_on(tty, state_msg);
1224 }
1225 }
1226
1227 void nmethod::unlink_from_method(bool acquire_lock) {
1228 // We need to check if both the _code and _from_compiled_code_entry_point
1229 // refer to this nmethod because there is a race in setting these two fields
1230 // in Method* as seen in bugid 4947125.
1231 // If the vep() points to the zombie nmethod, the memory for the nmethod
1232 // could be flushed and the compiler and vtable stubs could still call
1233 // through it.
1234 if (method() != NULL && (method()->code() == this ||
1235 method()->from_compiled_entry() == verified_entry_point())) {
1236 method()->clear_code(acquire_lock);
1237 }
1238 }
1239
1240 /**
1241 * Common functionality for both make_not_entrant and make_zombie
1242 */
1243 bool nmethod::make_not_entrant_or_zombie(int state) {
1244 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1245 assert(!is_zombie(), "should not already be a zombie");
1246
1247 if (_state == state) {
1248 // Avoid taking the lock if already in required state.
1249 // This is safe from races because the state is an end-state,
1250 // which the nmethod cannot back out of once entered.
1251 // No need for fencing either.
1252 return false;
1253 }
1254
1255 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1256 nmethodLocker nml(this);
1257 methodHandle the_method(method());
1258 // This can be called while the system is already at a safepoint which is ok
1259 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1260
1261 // during patching, depending on the nmethod state we must notify the GC that
1262 // code has been unloaded, unregistering it. We cannot do this right while
1263 // holding the Patching_lock because we need to use the CodeCache_lock. This
1264 // would be prone to deadlocks.
1265 // This flag is used to remember whether we need to later lock and unregister.
1266 bool nmethod_needs_unregister = false;
1267
1268 {
1269 // invalidate osr nmethod before acquiring the patching lock since
1270 // they both acquire leaf locks and we don't want a deadlock.
1271 // This logic is equivalent to the logic below for patching the
1272 // verified entry point of regular methods. We check that the
1273 // nmethod is in use to ensure that it is invalidated only once.
1274 if (is_osr_method() && is_in_use()) {
1275 // this effectively makes the osr nmethod not entrant
1276 invalidate_osr_method();
1277 }
1278
1279 // Enter critical section. Does not block for safepoint.
1280 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1281
1282 if (_state == state) {
1283 // another thread already performed this transition so nothing
1284 // to do, but return false to indicate this.
1285 return false;
1286 }
1287
1288 // The caller can be calling the method statically or through an inline
1289 // cache call.
1290 if (!is_osr_method() && !is_not_entrant()) {
1291 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1292 SharedRuntime::get_handle_wrong_method_stub());
1293 }
1294
1295 if (is_in_use() && update_recompile_counts()) {
1296 // It's a true state change, so mark the method as decompiled.
1297 // Do it only for transition from alive.
1298 inc_decompile_count();
1299 }
1300
1301 // If the state is becoming a zombie, signal to unregister the nmethod with
1302 // the heap.
1303 // This nmethod may have already been unloaded during a full GC.
1304 if ((state == zombie) && !is_unloaded()) {
1305 nmethod_needs_unregister = true;
1306 }
1307
1308 // Must happen before state change. Otherwise we have a race condition in
1309 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1310 // transition its state from 'not_entrant' to 'zombie' without having to wait
1311 // for stack scanning.
1312 if (state == not_entrant) {
1313 mark_as_seen_on_stack();
1314 OrderAccess::storestore(); // _stack_traversal_mark and _state
1315 }
1316
1317 // Change state
1318 _state = state;
1319
1320 // Log the transition once
1321 log_state_change();
1322
1323 // Invalidate while holding the patching lock
1324 JVMCI_ONLY(maybe_invalidate_installed_code());
1325
1326 // Remove nmethod from method.
1327 unlink_from_method(false /* already owns Patching_lock */);
1328 } // leave critical region under Patching_lock
1329
1330 #ifdef ASSERT
1331 if (is_osr_method() && method() != NULL) {
1332 // Make sure osr nmethod is invalidated, i.e. not on the list
1333 bool found = method()->method_holder()->remove_osr_nmethod(this);
1334 assert(!found, "osr nmethod should have been invalidated");
1335 }
1336 #endif
1337
1338 // When the nmethod becomes zombie it is no longer alive so the
1339 // dependencies must be flushed. nmethods in the not_entrant
1340 // state will be flushed later when the transition to zombie
1341 // happens or they get unloaded.
1342 if (state == zombie) {
1343 {
1344 // Flushing dependencies must be done before any possible
1345 // safepoint can sneak in, otherwise the oops used by the
1346 // dependency logic could have become stale.
1347 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1348 if (nmethod_needs_unregister) {
1349 Universe::heap()->unregister_nmethod(this);
1350 CodeCache::unregister_old_nmethod(this);
1351 }
1352 flush_dependencies(/*delete_immediately*/true);
1353 }
1354
1355 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1356 // nmethods during the next safepoint (see ICStub::finalize), as well
1357 // as to free up CompiledICHolder resources.
1358 {
1359 CompiledICLocker ml(this);
1360 clear_ic_callsites();
1361 }
1362
1363 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1364 // event and it hasn't already been reported for this nmethod then
1365 // report it now. The event may have been reported earlier if the GC
1366 // marked it for unloading). JvmtiDeferredEventQueue support means
1367 // we no longer go to a safepoint here.
1368 post_compiled_method_unload();
1369
1370 #ifdef ASSERT
1371 // It's no longer safe to access the oops section since zombie
1372 // nmethods aren't scanned for GC.
1373 _oops_are_stale = true;
1374 #endif
1375 // the Method may be reclaimed by class unloading now that the
1376 // nmethod is in zombie state
1377 set_method(NULL);
1378 } else {
1379 assert(state == not_entrant, "other cases may need to be handled differently");
1380 }
1381
1382 if (TraceCreateZombies) {
1383 ResourceMark m;
1384 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");
1385 }
1386
1387 NMethodSweeper::report_state_change(this);
1388 return true;
1389 }
1390
1391 void nmethod::flush() {
1392 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1393 // Note that there are no valid oops in the nmethod anymore.
1394 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1395 "osr nmethod must be unloaded or zombie before flushing");
1396 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1397 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1398 assert_locked_or_safepoint(CodeCache_lock);
1399
1400 // completely deallocate this method
1401 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1402 if (PrintMethodFlushing) {
1403 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1404 "/Free CodeCache:" SIZE_FORMAT "Kb",
1405 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1406 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1407 }
1408
1409 // We need to deallocate any ExceptionCache data.
1410 // Note that we do not need to grab the nmethod lock for this, it
1411 // better be thread safe if we're disposing of it!
1412 ExceptionCache* ec = exception_cache();
1413 set_exception_cache(NULL);
1414 while(ec != NULL) {
1415 ExceptionCache* next = ec->next();
1416 delete ec;
1417 ec = next;
1418 }
1419
1420 #if INCLUDE_JVMCI
1421 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1422 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1423 #endif
1424
1425 Universe::heap()->flush_nmethod(this);
1426
1427 CodeBlob::flush();
1428 CodeCache::free(this);
1429 }
1430
1431 oop nmethod::oop_at(int index) const {
1432 if (index == 0) {
1433 return NULL;
1434 }
1435 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1436 }
1437
1438 //
1439 // Notify all classes this nmethod is dependent on that it is no
1440 // longer dependent. This should only be called in two situations.
1441 // First, when a nmethod transitions to a zombie all dependents need
1442 // to be clear. Since zombification happens at a safepoint there's no
1443 // synchronization issues. The second place is a little more tricky.
1444 // During phase 1 of mark sweep class unloading may happen and as a
1445 // result some nmethods may get unloaded. In this case the flushing
1446 // of dependencies must happen during phase 1 since after GC any
1447 // dependencies in the unloaded nmethod won't be updated, so
1448 // traversing the dependency information in unsafe. In that case this
1449 // function is called with a boolean argument and this function only
1450 // notifies instanceKlasses that are reachable
1451
1452 void nmethod::flush_dependencies(bool delete_immediately) {
1453 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1454 assert(called_by_gc != delete_immediately,
1455 "delete_immediately is false if and only if we are called during GC");
1456 if (!has_flushed_dependencies()) {
1457 set_has_flushed_dependencies();
1458 for (Dependencies::DepStream deps(this); deps.next(); ) {
1459 if (deps.type() == Dependencies::call_site_target_value) {
1460 // CallSite dependencies are managed on per-CallSite instance basis.
1461 oop call_site = deps.argument_oop(0);
1462 if (delete_immediately) {
1463 assert_locked_or_safepoint(CodeCache_lock);
1464 MethodHandles::remove_dependent_nmethod(call_site, this);
1465 } else {
1466 MethodHandles::clean_dependency_context(call_site);
1467 }
1468 } else {
1469 Klass* klass = deps.context_type();
1470 if (klass == NULL) {
1471 continue; // ignore things like evol_method
1472 }
1473 // During GC delete_immediately is false, and liveness
1474 // of dependee determines class that needs to be updated.
1475 if (delete_immediately) {
1476 assert_locked_or_safepoint(CodeCache_lock);
1477 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1478 } else if (klass->is_loader_alive()) {
1479 // The GC may clean dependency contexts concurrently and in parallel.
1480 InstanceKlass::cast(klass)->clean_dependency_context();
1481 }
1482 }
1483 }
1484 }
1485 }
1486
1487 // ------------------------------------------------------------------
1488 // post_compiled_method_load_event
1489 // new method for install_code() path
1490 // Transfer information from compilation to jvmti
1491 void nmethod::post_compiled_method_load_event() {
1492
1493 Method* moop = method();
1494 HOTSPOT_COMPILED_METHOD_LOAD(
1495 (char *) moop->klass_name()->bytes(),
1496 moop->klass_name()->utf8_length(),
1497 (char *) moop->name()->bytes(),
1498 moop->name()->utf8_length(),
1499 (char *) moop->signature()->bytes(),
1500 moop->signature()->utf8_length(),
1501 insts_begin(), insts_size());
1502
1503 if (JvmtiExport::should_post_compiled_method_load() ||
1504 JvmtiExport::should_post_compiled_method_unload()) {
1505 get_and_cache_jmethod_id();
1506 }
1507
1508 if (JvmtiExport::should_post_compiled_method_load()) {
1509 // Let the Service thread (which is a real Java thread) post the event
1510 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1511 JvmtiDeferredEventQueue::enqueue(
1512 JvmtiDeferredEvent::compiled_method_load_event(this));
1513 }
1514 }
1515
1516 jmethodID nmethod::get_and_cache_jmethod_id() {
1517 if (_jmethod_id == NULL) {
1518 // Cache the jmethod_id since it can no longer be looked up once the
1519 // method itself has been marked for unloading.
1520 _jmethod_id = method()->jmethod_id();
1521 }
1522 return _jmethod_id;
1523 }
1524
1525 void nmethod::post_compiled_method_unload() {
1526 if (unload_reported()) {
1527 // During unloading we transition to unloaded and then to zombie
1528 // and the unloading is reported during the first transition.
1529 return;
1530 }
1531
1532 assert(_method != NULL && !is_unloaded(), "just checking");
1533 DTRACE_METHOD_UNLOAD_PROBE(method());
1534
1535 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1536 // post the event. Sometime later this nmethod will be made a zombie
1537 // by the sweeper but the Method* will not be valid at that point.
1538 // If the _jmethod_id is null then no load event was ever requested
1539 // so don't bother posting the unload. The main reason for this is
1540 // that the jmethodID is a weak reference to the Method* so if
1541 // it's being unloaded there's no way to look it up since the weak
1542 // ref will have been cleared.
1543 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1544 assert(!unload_reported(), "already unloaded");
1545 JvmtiDeferredEvent event =
1546 JvmtiDeferredEvent::compiled_method_unload_event(this,
1547 _jmethod_id, insts_begin());
1548 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1549 JvmtiDeferredEventQueue::enqueue(event);
1550 }
1551
1552 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1553 // any time. As the nmethod is being unloaded now we mark it has
1554 // having the unload event reported - this will ensure that we don't
1555 // attempt to report the event in the unlikely scenario where the
1556 // event is enabled at the time the nmethod is made a zombie.
1557 set_unload_reported();
1558 }
1559
1560 // Iterate over metadata calling this function. Used by RedefineClasses
1561 void nmethod::metadata_do(MetadataClosure* f) {
1562 {
1563 // Visit all immediate references that are embedded in the instruction stream.
1564 RelocIterator iter(this, oops_reloc_begin());
1565 while (iter.next()) {
1566 if (iter.type() == relocInfo::metadata_type ) {
1567 metadata_Relocation* r = iter.metadata_reloc();
1568 // In this metadata, we must only follow those metadatas directly embedded in
1569 // the code. Other metadatas (oop_index>0) are seen as part of
1570 // the metadata section below.
1571 assert(1 == (r->metadata_is_immediate()) +
1572 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1573 "metadata must be found in exactly one place");
1574 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1575 Metadata* md = r->metadata_value();
1576 if (md != _method) f->do_metadata(md);
1577 }
1578 } else if (iter.type() == relocInfo::virtual_call_type) {
1579 // Check compiledIC holders associated with this nmethod
1580 ResourceMark rm;
1581 CompiledIC *ic = CompiledIC_at(&iter);
1582 if (ic->is_icholder_call()) {
1583 CompiledICHolder* cichk = ic->cached_icholder();
1584 f->do_metadata(cichk->holder_metadata());
1585 f->do_metadata(cichk->holder_klass());
1586 } else {
1587 Metadata* ic_oop = ic->cached_metadata();
1588 if (ic_oop != NULL) {
1589 f->do_metadata(ic_oop);
1590 }
1591 }
1592 }
1593 }
1594 }
1595
1596 // Visit the metadata section
1597 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1598 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1599 Metadata* md = *p;
1600 f->do_metadata(md);
1601 }
1602
1603 // Visit metadata not embedded in the other places.
1604 if (_method != NULL) f->do_metadata(_method);
1605 }
1606
1607 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1608 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1609 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1610 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1611 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1612
1613 class IsUnloadingState: public AllStatic {
1614 static const uint8_t _is_unloading_mask = 1;
1615 static const uint8_t _is_unloading_shift = 0;
1616 static const uint8_t _unloading_cycle_mask = 6;
1617 static const uint8_t _unloading_cycle_shift = 1;
1618
1619 static uint8_t set_is_unloading(uint8_t state, bool value) {
1620 state &= ~_is_unloading_mask;
1621 if (value) {
1622 state |= 1 << _is_unloading_shift;
1623 }
1624 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1625 return state;
1626 }
1627
1628 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1629 state &= ~_unloading_cycle_mask;
1630 state |= value << _unloading_cycle_shift;
1631 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1632 return state;
1633 }
1634
1635 public:
1636 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1637 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1638
1639 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1640 uint8_t state = 0;
1641 state = set_is_unloading(state, is_unloading);
1642 state = set_unloading_cycle(state, unloading_cycle);
1643 return state;
1644 }
1645 };
1646
1647 bool nmethod::is_unloading() {
1648 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1649 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1650 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1651 if (state_is_unloading) {
1652 return true;
1653 }
1654 uint8_t current_cycle = CodeCache::unloading_cycle();
1655 if (state_unloading_cycle == current_cycle) {
1656 return false;
1657 }
1658
1659 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1660 // oops in the CompiledMethod, by calling oops_do on it.
1661 state_unloading_cycle = current_cycle;
1662
1663 if (is_zombie()) {
1664 // Zombies without calculated unloading epoch are never unloading due to GC.
1665
1666 // There are no races where a previously observed is_unloading() nmethod
1667 // suddenly becomes not is_unloading() due to here being observed as zombie.
1668
1669 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1670 // and unloaded in the safepoint. That makes races where an nmethod is first
1671 // observed as is_alive() && is_unloading() and subsequently observed as
1672 // is_zombie() impossible.
1673
1674 // With concurrent unloading, all references to is_unloading() nmethods are
1675 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1676 // handshake operation is performed with all JavaThreads before finally
1677 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1678 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1679 // the global handshake, it is impossible for is_unloading() nmethods to
1680 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1681 // nmethods before taking that global handshake, meaning that it will never
1682 // be recalculated after the handshake.
1683
1684 // After that global handshake, is_unloading() nmethods are only observable
1685 // to the iterators, and they will never trigger recomputation of the cached
1686 // is_unloading_state, and hence may not suffer from such races.
1687
1688 state_is_unloading = false;
1689 } else {
1690 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1691 }
1692
1693 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1694
1695 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1696
1697 return state_is_unloading;
1698 }
1699
1700 void nmethod::clear_unloading_state() {
1701 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1702 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1703 }
1704
1705
1706 // This is called at the end of the strong tracing/marking phase of a
1707 // GC to unload an nmethod if it contains otherwise unreachable
1708 // oops.
1709
1710 void nmethod::do_unloading(bool unloading_occurred) {
1711 // Make sure the oop's ready to receive visitors
1712 assert(!is_zombie() && !is_unloaded(),
1713 "should not call follow on zombie or unloaded nmethod");
1714
1715 if (is_unloading()) {
1716 make_unloaded();
1717 } else {
1718 #if INCLUDE_JVMCI
1719 if (_jvmci_installed_code != NULL) {
1720 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1721 if (_jvmci_installed_code_triggers_invalidation) {
1722 make_not_entrant();
1723 }
1724 clear_jvmci_installed_code();
1725 }
1726 }
1727 #endif
1728
1729 guarantee(unload_nmethod_caches(unloading_occurred),
1730 "Should not need transition stubs");
1731 }
1732 }
1733
1734 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1735 // make sure the oops ready to receive visitors
1736 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1737 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1738
1739 // Prevent extra code cache walk for platforms that don't have immediate oops.
1740 if (relocInfo::mustIterateImmediateOopsInCode()) {
1741 RelocIterator iter(this, oops_reloc_begin());
1742
1743 while (iter.next()) {
1744 if (iter.type() == relocInfo::oop_type ) {
1745 oop_Relocation* r = iter.oop_reloc();
1746 // In this loop, we must only follow those oops directly embedded in
1747 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1748 assert(1 == (r->oop_is_immediate()) +
1749 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1750 "oop must be found in exactly one place");
1751 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1752 f->do_oop(r->oop_addr());
1753 }
1754 }
1755 }
1756 }
1757
1758 // Scopes
1759 // This includes oop constants not inlined in the code stream.
1760 for (oop* p = oops_begin(); p < oops_end(); p++) {
1761 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1762 f->do_oop(p);
1763 }
1764 }
1765
1766 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1767
1768 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1769
1770 // An nmethod is "marked" if its _mark_link is set non-null.
1771 // Even if it is the end of the linked list, it will have a non-null link value,
1772 // as long as it is on the list.
1773 // This code must be MP safe, because it is used from parallel GC passes.
1774 bool nmethod::test_set_oops_do_mark() {
1775 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1776 if (_oops_do_mark_link == NULL) {
1777 // Claim this nmethod for this thread to mark.
1778 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1779 // Atomically append this nmethod (now claimed) to the head of the list:
1780 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1781 for (;;) {
1782 nmethod* required_mark_nmethods = observed_mark_nmethods;
1783 _oops_do_mark_link = required_mark_nmethods;
1784 observed_mark_nmethods =
1785 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1786 if (observed_mark_nmethods == required_mark_nmethods)
1787 break;
1788 }
1789 // Mark was clear when we first saw this guy.
1790 LogTarget(Trace, gc, nmethod) lt;
1791 if (lt.is_enabled()) {
1792 LogStream ls(lt);
1793 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1794 }
1795 return false;
1796 }
1797 }
1798 // On fall through, another racing thread marked this nmethod before we did.
1799 return true;
1800 }
1801
1802 void nmethod::oops_do_marking_prologue() {
1803 log_trace(gc, nmethod)("oops_do_marking_prologue");
1804 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1805 // We use cmpxchg instead of regular assignment here because the user
1806 // may fork a bunch of threads, and we need them all to see the same state.
1807 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1808 guarantee(observed == NULL, "no races in this sequential code");
1809 }
1810
1811 void nmethod::oops_do_marking_epilogue() {
1812 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1813 nmethod* cur = _oops_do_mark_nmethods;
1814 while (cur != NMETHOD_SENTINEL) {
1815 assert(cur != NULL, "not NULL-terminated");
1816 nmethod* next = cur->_oops_do_mark_link;
1817 cur->_oops_do_mark_link = NULL;
1818 DEBUG_ONLY(cur->verify_oop_relocations());
1819
1820 LogTarget(Trace, gc, nmethod) lt;
1821 if (lt.is_enabled()) {
1822 LogStream ls(lt);
1823 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1824 }
1825 cur = next;
1826 }
1827 nmethod* required = _oops_do_mark_nmethods;
1828 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1829 guarantee(observed == required, "no races in this sequential code");
1830 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1831 }
1832
1833 inline bool includes(void* p, void* from, void* to) {
1834 return from <= p && p < to;
1835 }
1836
1837
1838 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1839 assert(count >= 2, "must be sentinel values, at least");
1840
1841 #ifdef ASSERT
1842 // must be sorted and unique; we do a binary search in find_pc_desc()
1843 int prev_offset = pcs[0].pc_offset();
1844 assert(prev_offset == PcDesc::lower_offset_limit,
1845 "must start with a sentinel");
1846 for (int i = 1; i < count; i++) {
1847 int this_offset = pcs[i].pc_offset();
1848 assert(this_offset > prev_offset, "offsets must be sorted");
1849 prev_offset = this_offset;
1850 }
1851 assert(prev_offset == PcDesc::upper_offset_limit,
1852 "must end with a sentinel");
1853 #endif //ASSERT
1854
1855 // Search for MethodHandle invokes and tag the nmethod.
1856 for (int i = 0; i < count; i++) {
1857 if (pcs[i].is_method_handle_invoke()) {
1858 set_has_method_handle_invokes(true);
1859 break;
1860 }
1861 }
1862 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1863
1864 int size = count * sizeof(PcDesc);
1865 assert(scopes_pcs_size() >= size, "oob");
1866 memcpy(scopes_pcs_begin(), pcs, size);
1867
1868 // Adjust the final sentinel downward.
1869 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1870 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1871 last_pc->set_pc_offset(content_size() + 1);
1872 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1873 // Fill any rounding gaps with copies of the last record.
1874 last_pc[1] = last_pc[0];
1875 }
1876 // The following assert could fail if sizeof(PcDesc) is not
1877 // an integral multiple of oopSize (the rounding term).
1878 // If it fails, change the logic to always allocate a multiple
1879 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1880 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1881 }
1882
1883 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1884 assert(scopes_data_size() >= size, "oob");
1885 memcpy(scopes_data_begin(), buffer, size);
1886 }
1887
1888 #ifdef ASSERT
1889 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1890 PcDesc* lower = search.scopes_pcs_begin();
1891 PcDesc* upper = search.scopes_pcs_end();
1892 lower += 1; // exclude initial sentinel
1893 PcDesc* res = NULL;
1894 for (PcDesc* p = lower; p < upper; p++) {
1895 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1896 if (match_desc(p, pc_offset, approximate)) {
1897 if (res == NULL)
1898 res = p;
1899 else
1900 res = (PcDesc*) badAddress;
1901 }
1902 }
1903 return res;
1904 }
1905 #endif
1906
1907
1908 // Finds a PcDesc with real-pc equal to "pc"
1909 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1910 address base_address = search.code_begin();
1911 if ((pc < base_address) ||
1912 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1913 return NULL; // PC is wildly out of range
1914 }
1915 int pc_offset = (int) (pc - base_address);
1916
1917 // Check the PcDesc cache if it contains the desired PcDesc
1918 // (This as an almost 100% hit rate.)
1919 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1920 if (res != NULL) {
1921 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1922 return res;
1923 }
1924
1925 // Fallback algorithm: quasi-linear search for the PcDesc
1926 // Find the last pc_offset less than the given offset.
1927 // The successor must be the required match, if there is a match at all.
1928 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1929 PcDesc* lower = search.scopes_pcs_begin();
1930 PcDesc* upper = search.scopes_pcs_end();
1931 upper -= 1; // exclude final sentinel
1932 if (lower >= upper) return NULL; // native method; no PcDescs at all
1933
1934 #define assert_LU_OK \
1935 /* invariant on lower..upper during the following search: */ \
1936 assert(lower->pc_offset() < pc_offset, "sanity"); \
1937 assert(upper->pc_offset() >= pc_offset, "sanity")
1938 assert_LU_OK;
1939
1940 // Use the last successful return as a split point.
1941 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1942 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1943 if (mid->pc_offset() < pc_offset) {
1944 lower = mid;
1945 } else {
1946 upper = mid;
1947 }
1948
1949 // Take giant steps at first (4096, then 256, then 16, then 1)
1950 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1951 const int RADIX = (1 << LOG2_RADIX);
1952 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1953 while ((mid = lower + step) < upper) {
1954 assert_LU_OK;
1955 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1956 if (mid->pc_offset() < pc_offset) {
1957 lower = mid;
1958 } else {
1959 upper = mid;
1960 break;
1961 }
1962 }
1963 assert_LU_OK;
1964 }
1965
1966 // Sneak up on the value with a linear search of length ~16.
1967 while (true) {
1968 assert_LU_OK;
1969 mid = lower + 1;
1970 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1971 if (mid->pc_offset() < pc_offset) {
1972 lower = mid;
1973 } else {
1974 upper = mid;
1975 break;
1976 }
1977 }
1978 #undef assert_LU_OK
1979
1980 if (match_desc(upper, pc_offset, approximate)) {
1981 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1982 _pc_desc_cache.add_pc_desc(upper);
1983 return upper;
1984 } else {
1985 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1986 return NULL;
1987 }
1988 }
1989
1990
1991 void nmethod::check_all_dependencies(DepChange& changes) {
1992 // Checked dependencies are allocated into this ResourceMark
1993 ResourceMark rm;
1994
1995 // Turn off dependency tracing while actually testing dependencies.
1996 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1997
1998 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1999 &DependencySignature::equals, 11027> DepTable;
2000
2001 DepTable* table = new DepTable();
2002
2003 // Iterate over live nmethods and check dependencies of all nmethods that are not
2004 // marked for deoptimization. A particular dependency is only checked once.
2005 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2006 while(iter.next()) {
2007 nmethod* nm = iter.method();
2008 // Only notify for live nmethods
2009 if (!nm->is_marked_for_deoptimization()) {
2010 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2011 // Construct abstraction of a dependency.
2012 DependencySignature* current_sig = new DependencySignature(deps);
2013
2014 // Determine if dependency is already checked. table->put(...) returns
2015 // 'true' if the dependency is added (i.e., was not in the hashtable).
2016 if (table->put(*current_sig, 1)) {
2017 if (deps.check_dependency() != NULL) {
2018 // Dependency checking failed. Print out information about the failed
2019 // dependency and finally fail with an assert. We can fail here, since
2020 // dependency checking is never done in a product build.
2021 tty->print_cr("Failed dependency:");
2022 changes.print();
2023 nm->print();
2024 nm->print_dependencies();
2025 assert(false, "Should have been marked for deoptimization");
2026 }
2027 }
2028 }
2029 }
2030 }
2031 }
2032
2033 bool nmethod::check_dependency_on(DepChange& changes) {
2034 // What has happened:
2035 // 1) a new class dependee has been added
2036 // 2) dependee and all its super classes have been marked
2037 bool found_check = false; // set true if we are upset
2038 for (Dependencies::DepStream deps(this); deps.next(); ) {
2039 // Evaluate only relevant dependencies.
2040 if (deps.spot_check_dependency_at(changes) != NULL) {
2041 found_check = true;
2042 NOT_DEBUG(break);
2043 }
2044 }
2045 return found_check;
2046 }
2047
2048 // Called from mark_for_deoptimization, when dependee is invalidated.
2049 bool nmethod::is_dependent_on_method(Method* dependee) {
2050 for (Dependencies::DepStream deps(this); deps.next(); ) {
2051 if (deps.type() != Dependencies::evol_method)
2052 continue;
2053 Method* method = deps.method_argument(0);
2054 if (method == dependee) return true;
2055 }
2056 return false;
2057 }
2058
2059
2060 bool nmethod::is_patchable_at(address instr_addr) {
2061 assert(insts_contains(instr_addr), "wrong nmethod used");
2062 if (is_zombie()) {
2063 // a zombie may never be patched
2064 return false;
2065 }
2066 return true;
2067 }
2068
2069
2070 address nmethod::continuation_for_implicit_exception(address pc) {
2071 // Exception happened outside inline-cache check code => we are inside
2072 // an active nmethod => use cpc to determine a return address
2073 int exception_offset = pc - code_begin();
2074 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2075 #ifdef ASSERT
2076 if (cont_offset == 0) {
2077 Thread* thread = Thread::current();
2078 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2079 HandleMark hm(thread);
2080 ResourceMark rm(thread);
2081 CodeBlob* cb = CodeCache::find_blob(pc);
2082 assert(cb != NULL && cb == this, "");
2083 ttyLocker ttyl;
2084 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2085 // Print all available nmethod info.
2086 print_nmethod(true);
2087 method()->print_codes();
2088 }
2089 #endif
2090 if (cont_offset == 0) {
2091 // Let the normal error handling report the exception
2092 return NULL;
2093 }
2094 return code_begin() + cont_offset;
2095 }
2096
2097
2098 void nmethod_init() {
2099 // make sure you didn't forget to adjust the filler fields
2100 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2101 }
2102
2103
2104 //-------------------------------------------------------------------------------------------
2105
2106
2107 // QQQ might we make this work from a frame??
2108 nmethodLocker::nmethodLocker(address pc) {
2109 CodeBlob* cb = CodeCache::find_blob(pc);
2110 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2111 _nm = cb->as_compiled_method();
2112 lock_nmethod(_nm);
2113 }
2114
2115 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2116 // should pass zombie_ok == true.
2117 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2118 if (cm == NULL) return;
2119 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2120 nmethod* nm = cm->as_nmethod();
2121 Atomic::inc(&nm->_lock_count);
2122 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2123 }
2124
2125 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2126 if (cm == NULL) return;
2127 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2128 nmethod* nm = cm->as_nmethod();
2129 Atomic::dec(&nm->_lock_count);
2130 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2131 }
2132
2133
2134 // -----------------------------------------------------------------------------
2135 // Verification
2136
2137 class VerifyOopsClosure: public OopClosure {
2138 nmethod* _nm;
2139 bool _ok;
2140 public:
2141 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2142 bool ok() { return _ok; }
2143 virtual void do_oop(oop* p) {
2144 if (oopDesc::is_oop_or_null(*p)) return;
2145 // Print diagnostic information before calling print_nmethod().
2146 // Assertions therein might prevent call from returning.
2147 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2148 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2149 if (_ok) {
2150 _nm->print_nmethod(true);
2151 _ok = false;
2152 }
2153 }
2154 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2155 };
2156
2157 void nmethod::verify() {
2158
2159 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2160 // seems odd.
2161
2162 if (is_zombie() || is_not_entrant() || is_unloaded())
2163 return;
2164
2165 // Make sure all the entry points are correctly aligned for patching.
2166 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2167
2168 // assert(oopDesc::is_oop(method()), "must be valid");
2169
2170 ResourceMark rm;
2171
2172 if (!CodeCache::contains(this)) {
2173 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2174 }
2175
2176 if(is_native_method() )
2177 return;
2178
2179 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2180 if (nm != this) {
2181 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2182 }
2183
2184 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2185 if (! p->verify(this)) {
2186 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2187 }
2188 }
2189
2190 VerifyOopsClosure voc(this);
2191 oops_do(&voc);
2192 assert(voc.ok(), "embedded oops must be OK");
2193 Universe::heap()->verify_nmethod(this);
2194
2195 verify_scopes();
2196 }
2197
2198
2199 void nmethod::verify_interrupt_point(address call_site) {
2200 // Verify IC only when nmethod installation is finished.
2201 if (!is_not_installed()) {
2202 if (CompiledICLocker::is_safe(this)) {
2203 CompiledIC_at(this, call_site);
2204 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2205 } else {
2206 CompiledICLocker ml_verify(this);
2207 CompiledIC_at(this, call_site);
2208 }
2209 }
2210
2211 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2212 assert(pd != NULL, "PcDesc must exist");
2213 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2214 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2215 pd->return_oop());
2216 !sd->is_top(); sd = sd->sender()) {
2217 sd->verify();
2218 }
2219 }
2220
2221 void nmethod::verify_scopes() {
2222 if( !method() ) return; // Runtime stubs have no scope
2223 if (method()->is_native()) return; // Ignore stub methods.
2224 // iterate through all interrupt point
2225 // and verify the debug information is valid.
2226 RelocIterator iter((nmethod*)this);
2227 while (iter.next()) {
2228 address stub = NULL;
2229 switch (iter.type()) {
2230 case relocInfo::virtual_call_type:
2231 verify_interrupt_point(iter.addr());
2232 break;
2233 case relocInfo::opt_virtual_call_type:
2234 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2235 verify_interrupt_point(iter.addr());
2236 break;
2237 case relocInfo::static_call_type:
2238 stub = iter.static_call_reloc()->static_stub(false);
2239 //verify_interrupt_point(iter.addr());
2240 break;
2241 case relocInfo::runtime_call_type:
2242 case relocInfo::runtime_call_w_cp_type: {
2243 address destination = iter.reloc()->value();
2244 // Right now there is no way to find out which entries support
2245 // an interrupt point. It would be nice if we had this
2246 // information in a table.
2247 break;
2248 }
2249 default:
2250 break;
2251 }
2252 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2253 }
2254 }
2255
2256
2257 // -----------------------------------------------------------------------------
2258 // Printing operations
2259
2260 void nmethod::print() const {
2261 ttyLocker ttyl; // keep the following output all in one block
2262 print(tty);
2263 }
2264
2265 void nmethod::print(outputStream* st) const {
2266 ResourceMark rm;
2267
2268 st->print("Compiled method ");
2269
2270 // Print compilation level in addition
2271 st->print("(t%c)", tier_digit(comp_level()));
2272 if (is_compiled_by_c1()) {
2273 st->print("(c1) ");
2274 } else if (is_compiled_by_c2()) {
2275 st->print("(c2) ");
2276 #if defined(INCLUDE_JVMCI)
2277 } else if (is_compiled_by_jvmci()) {
2278 st->print("(JVMCI) ");
2279 #endif
2280 } else {
2281 st->print("(nm) ");
2282 }
2283
2284 print_on(st, NULL);
2285
2286 #if INCLUDE_JVMCI
2287 {
2288 char buffer[O_BUFLEN];
2289 char* jvmciName = jvmci_installed_code_name(buffer, O_BUFLEN);
2290 if (jvmciName != NULL) {
2291 st->print(" (%s)", jvmciName);
2292 }
2293 }
2294 #endif
2295
2296 if (WizardMode) {
2297 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2298 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2299 st->print(" { ");
2300 st->print_cr("%s ", state());
2301 st->print_cr("}:");
2302 }
2303 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2304 p2i(this),
2305 p2i(this) + size(),
2306 size());
2307 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2308 p2i(relocation_begin()),
2309 p2i(relocation_end()),
2310 relocation_size());
2311 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2312 p2i(consts_begin()),
2313 p2i(consts_end()),
2314 consts_size());
2315 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2316 p2i(insts_begin()),
2317 p2i(insts_end()),
2318 insts_size());
2319 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2320 p2i(stub_begin()),
2321 p2i(stub_end()),
2322 stub_size());
2323 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2324 p2i(oops_begin()),
2325 p2i(oops_end()),
2326 oops_size());
2327 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2328 p2i(metadata_begin()),
2329 p2i(metadata_end()),
2330 metadata_size());
2331 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2332 p2i(scopes_data_begin()),
2333 p2i(scopes_data_end()),
2334 scopes_data_size());
2335 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2336 p2i(scopes_pcs_begin()),
2337 p2i(scopes_pcs_end()),
2338 scopes_pcs_size());
2339 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2340 p2i(dependencies_begin()),
2341 p2i(dependencies_end()),
2342 dependencies_size());
2343 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2344 p2i(handler_table_begin()),
2345 p2i(handler_table_end()),
2346 handler_table_size());
2347 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2348 p2i(nul_chk_table_begin()),
2349 p2i(nul_chk_table_end()),
2350 nul_chk_table_size());
2351 }
2352
2353 void nmethod::print_code() {
2354 HandleMark hm;
2355 ResourceMark m;
2356 ttyLocker ttyl;
2357 // Call the specialized decode method of this class.
2358 decode(tty);
2359 }
2360
2361 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2362 void nmethod::print_dependencies() {
2363 ResourceMark rm;
2364 ttyLocker ttyl; // keep the following output all in one block
2365 tty->print_cr("Dependencies:");
2366 for (Dependencies::DepStream deps(this); deps.next(); ) {
2367 deps.print_dependency();
2368 Klass* ctxk = deps.context_type();
2369 if (ctxk != NULL) {
2370 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2371 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2372 }
2373 }
2374 deps.log_dependency(); // put it into the xml log also
2375 }
2376 }
2377 #endif
2378
2379 #if defined(SUPPORT_DATA_STRUCTS)
2380
2381 // Print the oops from the underlying CodeBlob.
2382 void nmethod::print_oops(outputStream* st) {
2383 HandleMark hm;
2384 ResourceMark m;
2385 st->print("Oops:");
2386 if (oops_begin() < oops_end()) {
2387 st->cr();
2388 for (oop* p = oops_begin(); p < oops_end(); p++) {
2389 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2390 st->print("0x%016lx ", *((unsigned long*)p));
2391 if (*p == Universe::non_oop_word()) {
2392 st->print_cr("NON_OOP");
2393 continue; // skip non-oops
2394 }
2395 if (*p == NULL) {
2396 st->print_cr("LUCY: NULL-oop");
2397 continue; // skip non-oops
2398 }
2399 (*p)->print_value_on(st);
2400 st->cr();
2401 }
2402 } else {
2403 st->print_cr(" <list empty>");
2404 }
2405 }
2406
2407 // Print metadata pool.
2408 void nmethod::print_metadata(outputStream* st) {
2409 HandleMark hm;
2410 ResourceMark m;
2411 st->print("Metadata:");
2412 if (metadata_begin() < metadata_end()) {
2413 st->cr();
2414 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2415 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2416 st->print("0x%016lx ", *((unsigned long*)p));
2417 if (*p && *p != Universe::non_oop_word()) {
2418 (*p)->print_value_on(st);
2419 }
2420 st->cr();
2421 }
2422 } else {
2423 st->print_cr(" <list empty>");
2424 }
2425 }
2426
2427 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2428 void nmethod::print_scopes_on(outputStream* st) {
2429 // Find the first pc desc for all scopes in the code and print it.
2430 ResourceMark rm;
2431 st->print("scopes:");
2432 if (scopes_pcs_begin() < scopes_pcs_end()) {
2433 st->cr();
2434 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2435 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2436 continue;
2437
2438 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2439 while (sd != NULL) {
2440 sd->print_on(st, p); // print output ends with a newline
2441 sd = sd->sender();
2442 }
2443 }
2444 } else {
2445 st->print_cr(" <list empty>");
2446 }
2447 }
2448 #endif
2449
2450 #ifndef PRODUCT // RelocIterator does support printing only then.
2451 void nmethod::print_relocations() {
2452 ResourceMark m; // in case methods get printed via the debugger
2453 tty->print_cr("relocations:");
2454 RelocIterator iter(this);
2455 iter.print();
2456 }
2457 #endif
2458
2459 void nmethod::print_pcs_on(outputStream* st) {
2460 ResourceMark m; // in case methods get printed via debugger
2461 st->print("pc-bytecode offsets:");
2462 if (scopes_pcs_begin() < scopes_pcs_end()) {
2463 st->cr();
2464 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2465 p->print_on(st, this); // print output ends with a newline
2466 }
2467 } else {
2468 st->print_cr(" <list empty>");
2469 }
2470 }
2471
2472 void nmethod::print_handler_table() {
2473 ExceptionHandlerTable(this).print();
2474 }
2475
2476 void nmethod::print_nul_chk_table() {
2477 ImplicitExceptionTable(this).print(code_begin());
2478 }
2479
2480 void nmethod::print_recorded_oops() {
2481 const int n = oops_count();
2482 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2483 tty->print("Recorded oops:");
2484 if (n > 0) {
2485 tty->cr();
2486 for (int i = 0; i < n; i++) {
2487 oop o = oop_at(i);
2488 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2489 if (o == (oop)Universe::non_oop_word()) {
2490 tty->print("non-oop word");
2491 } else if (o == NULL) {
2492 tty->print("LUCY NULL-oop");
2493 } else {
2494 o->print_value_on(tty);
2495 }
2496 tty->cr();
2497 }
2498 } else {
2499 tty->print_cr(" <list empty>");
2500 }
2501 }
2502
2503 void nmethod::print_recorded_metadata() {
2504 const int n = metadata_count();
2505 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2506 tty->print("Recorded metadata:");
2507 if (n > 0) {
2508 tty->cr();
2509 for (int i = 0; i < n; i++) {
2510 Metadata* m = metadata_at(i);
2511 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2512 if (m == (Metadata*)Universe::non_oop_word()) {
2513 tty->print("non-metadata word");
2514 } else if (m == NULL) {
2515 tty->print("LUCY NULL-oop");
2516 } else {
2517 Metadata::print_value_on_maybe_null(tty, m);
2518 }
2519 tty->cr();
2520 }
2521 } else {
2522 tty->print_cr(" <list empty>");
2523 }
2524 }
2525 #endif
2526
2527 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2528
2529 void nmethod::print_constant_pool(outputStream* st) {
2530 //-----------------------------------
2531 //---< Print the constant pool >---
2532 //-----------------------------------
2533 int consts_size = this->consts_size();
2534 if ( consts_size > 0 ) {
2535 unsigned char* cstart = this->consts_begin();
2536 unsigned char* cp = cstart;
2537 unsigned char* cend = cp + consts_size;
2538 unsigned int bytes_per_line = 4;
2539 unsigned int CP_alignment = 8;
2540 unsigned int n;
2541
2542 st->cr();
2543
2544 //---< print CP header to make clear what's printed >---
2545 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2546 n = bytes_per_line;
2547 st->print_cr("[Constant Pool]");
2548 Disassembler::print_location(cp, cstart, cend, st, true, true);
2549 Disassembler::print_hexdata(cp, n, st, true);
2550 st->cr();
2551 } else {
2552 n = (uintptr_t)cp&(bytes_per_line-1);
2553 st->print_cr("[Constant Pool (unaligned)]");
2554 }
2555
2556 //---< print CP contents, bytes_per_line at a time >---
2557 while (cp < cend) {
2558 Disassembler::print_location(cp, cstart, cend, st, true, false);
2559 Disassembler::print_hexdata(cp, n, st, false);
2560 cp += n;
2561 n = bytes_per_line;
2562 st->cr();
2563 }
2564
2565 //---< Show potential alignment gap between constant pool and code >---
2566 cend = code_begin();
2567 if( cp < cend ) {
2568 n = 4;
2569 st->print_cr("[Code entry alignment]");
2570 while (cp < cend) {
2571 Disassembler::print_location(cp, cstart, cend, st, false, false);
2572 cp += n;
2573 st->cr();
2574 }
2575 }
2576 } else {
2577 st->print_cr("[Constant Pool (empty)]");
2578 }
2579 st->cr();
2580 }
2581
2582 #endif
2583
2584 // Disassemble this nmethod.
2585 // Print additional debug information, if requested. This could be code
2586 // comments, block comments, profiling counters, etc.
2587 // The undisassembled format is useful no disassembler library is available.
2588 // The resulting hex dump (with markers) can be disassembled later, or on
2589 // another system, when/where a disassembler library is available.
2590 void nmethod::decode2(outputStream* ost) const {
2591
2592 // Called from frame::back_trace_with_decode without ResourceMark.
2593 ResourceMark rm;
2594
2595 // Make sure we have a valid stream to print on.
2596 outputStream* st = ost ? ost : tty;
2597
2598 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2599 const bool use_compressed_format = true;
2600 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2601 AbstractDisassembler::show_block_comment());
2602 #else
2603 const bool use_compressed_format = Disassembler::is_abstract();
2604 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2605 AbstractDisassembler::show_block_comment());
2606 #endif
2607
2608 st->cr();
2609 this->print(st);
2610 st->cr();
2611
2612 #if defined(SUPPORT_ASSEMBLY)
2613 //----------------------------------
2614 //---< Print real disassembly >---
2615 //----------------------------------
2616 if (! use_compressed_format) {
2617 Disassembler::decode(const_cast<nmethod*>(this), st);
2618 return;
2619 }
2620 #endif
2621
2622 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2623
2624 // Compressed undisassembled disassembly format.
2625 // The following stati are defined/supported:
2626 // = 0 - currently at bol() position, nothing printed yet on current line.
2627 // = 1 - currently at position after print_location().
2628 // > 1 - in the midst of printing instruction stream bytes.
2629 int compressed_format_idx = 0;
2630 int code_comment_column = 0;
2631 const int instr_maxlen = Assembler::instr_maxlen();
2632 const uint tabspacing = 8;
2633 unsigned char* start = this->code_begin();
2634 unsigned char* p = this->code_begin();
2635 unsigned char* end = this->code_end();
2636 unsigned char* pss = p; // start of a code section (used for offsets)
2637
2638 if ((start == NULL) || (end == NULL)) {
2639 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2640 return;
2641 }
2642 #endif
2643
2644 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2645 //---< plain abstract disassembly, no comments or anything, just section headers >---
2646 if (use_compressed_format && ! compressed_with_comments) {
2647 const_cast<nmethod*>(this)->print_constant_pool(st);
2648
2649 //---< Open the output (Marker for post-mortem disassembler) >---
2650 st->print_cr("[MachCode]");
2651 const char* header = NULL;
2652 address p0 = p;
2653 while (p < end) {
2654 address pp = p;
2655 while ((p < end) && (header == NULL)) {
2656 header = nmethod_section_label(p);
2657 pp = p;
2658 p += Assembler::instr_len(p);
2659 }
2660 if (pp > p0) {
2661 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2662 p0 = pp;
2663 p = pp;
2664 header = NULL;
2665 } else if (header != NULL) {
2666 st->bol();
2667 st->print_cr("%s", header);
2668 header = NULL;
2669 }
2670 }
2671 //---< Close the output (Marker for post-mortem disassembler) >---
2672 st->bol();
2673 st->print_cr("[/MachCode]");
2674 return;
2675 }
2676 #endif
2677
2678 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2679 //---< abstract disassembly with comments and section headers merged in >---
2680 if (compressed_with_comments) {
2681 const_cast<nmethod*>(this)->print_constant_pool(st);
2682
2683 //---< Open the output (Marker for post-mortem disassembler) >---
2684 st->print_cr("[MachCode]");
2685 while ((p < end) && (p != NULL)) {
2686 const int instruction_size_in_bytes = Assembler::instr_len(p);
2687
2688 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2689 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2690 // Prints nmethod_section_label as well.
2691 if (AbstractDisassembler::show_block_comment()) {
2692 print_block_comment(st, p);
2693 if (st->position() == 0) {
2694 compressed_format_idx = 0;
2695 }
2696 }
2697
2698 //---< New location information after line break >---
2699 if (compressed_format_idx == 0) {
2700 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2701 compressed_format_idx = 1;
2702 }
2703
2704 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2705 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2706 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2707
2708 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2709 //---< interrupt instruction byte stream for code comment >---
2710 if (compressed_format_idx > 1) {
2711 st->cr(); // interrupt byte stream
2712 st->cr(); // add an empty line
2713 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2714 }
2715 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2716 st->bol();
2717 compressed_format_idx = 0;
2718 }
2719
2720 //---< New location information after line break >---
2721 if (compressed_format_idx == 0) {
2722 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2723 compressed_format_idx = 1;
2724 }
2725
2726 //---< Nicely align instructions for readability >---
2727 if (compressed_format_idx > 1) {
2728 Disassembler::print_delimiter(st);
2729 }
2730
2731 //---< Now, finally, print the actual instruction bytes >---
2732 unsigned char* p0 = p;
2733 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2734 compressed_format_idx += p - p0;
2735
2736 if (Disassembler::start_newline(compressed_format_idx-1)) {
2737 st->cr();
2738 compressed_format_idx = 0;
2739 }
2740 }
2741 //---< Close the output (Marker for post-mortem disassembler) >---
2742 st->bol();
2743 st->print_cr("[/MachCode]");
2744 return;
2745 }
2746 #endif
2747 }
2748
2749 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2750
2751 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2752 RelocIterator iter(this, begin, end);
2753 bool have_one = false;
2754 while (iter.next()) {
2755 have_one = true;
2756 switch (iter.type()) {
2757 case relocInfo::none: return "no_reloc";
2758 case relocInfo::oop_type: {
2759 // Get a non-resizable resource-allocated stringStream.
2760 // Our callees make use of (nested) ResourceMarks.
2761 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2762 oop_Relocation* r = iter.oop_reloc();
2763 oop obj = r->oop_value();
2764 st.print("oop(");
2765 if (obj == NULL) st.print("NULL");
2766 else obj->print_value_on(&st);
2767 st.print(")");
2768 return st.as_string();
2769 }
2770 case relocInfo::metadata_type: {
2771 stringStream st;
2772 metadata_Relocation* r = iter.metadata_reloc();
2773 Metadata* obj = r->metadata_value();
2774 st.print("metadata(");
2775 if (obj == NULL) st.print("NULL");
2776 else obj->print_value_on(&st);
2777 st.print(")");
2778 return st.as_string();
2779 }
2780 case relocInfo::runtime_call_type:
2781 case relocInfo::runtime_call_w_cp_type: {
2782 stringStream st;
2783 st.print("runtime_call");
2784 CallRelocation* r = (CallRelocation*)iter.reloc();
2785 address dest = r->destination();
2786 CodeBlob* cb = CodeCache::find_blob(dest);
2787 if (cb != NULL) {
2788 st.print(" %s", cb->name());
2789 } else {
2790 ResourceMark rm;
2791 const int buflen = 1024;
2792 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2793 int offset;
2794 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2795 st.print(" %s", buf);
2796 if (offset != 0) {
2797 st.print("+%d", offset);
2798 }
2799 }
2800 }
2801 return st.as_string();
2802 }
2803 case relocInfo::virtual_call_type: {
2804 stringStream st;
2805 st.print_raw("virtual_call");
2806 virtual_call_Relocation* r = iter.virtual_call_reloc();
2807 Method* m = r->method_value();
2808 if (m != NULL) {
2809 assert(m->is_method(), "");
2810 m->print_short_name(&st);
2811 }
2812 return st.as_string();
2813 }
2814 case relocInfo::opt_virtual_call_type: {
2815 stringStream st;
2816 st.print_raw("optimized virtual_call");
2817 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2818 Method* m = r->method_value();
2819 if (m != NULL) {
2820 assert(m->is_method(), "");
2821 m->print_short_name(&st);
2822 }
2823 return st.as_string();
2824 }
2825 case relocInfo::static_call_type: {
2826 stringStream st;
2827 st.print_raw("static_call");
2828 static_call_Relocation* r = iter.static_call_reloc();
2829 Method* m = r->method_value();
2830 if (m != NULL) {
2831 assert(m->is_method(), "");
2832 m->print_short_name(&st);
2833 }
2834 return st.as_string();
2835 }
2836 case relocInfo::static_stub_type: return "static_stub";
2837 case relocInfo::external_word_type: return "external_word";
2838 case relocInfo::internal_word_type: return "internal_word";
2839 case relocInfo::section_word_type: return "section_word";
2840 case relocInfo::poll_type: return "poll";
2841 case relocInfo::poll_return_type: return "poll_return";
2842 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2843 case relocInfo::type_mask: return "type_bit_mask";
2844
2845 default:
2846 break;
2847 }
2848 }
2849 return have_one ? "other" : NULL;
2850 }
2851
2852 // Return a the last scope in (begin..end]
2853 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2854 PcDesc* p = pc_desc_near(begin+1);
2855 if (p != NULL && p->real_pc(this) <= end) {
2856 return new ScopeDesc(this, p->scope_decode_offset(),
2857 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2858 p->return_oop());
2859 }
2860 return NULL;
2861 }
2862
2863 const char* nmethod::nmethod_section_label(address pos) const {
2864 const char* label = NULL;
2865 if (pos == code_begin()) label = "[Instructions begin]";
2866 if (pos == entry_point()) label = "[Entry Point]";
2867 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2868 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2869 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2870 // Check stub_code before checking exception_handler or deopt_handler.
2871 if (pos == this->stub_begin()) label = "[Stub Code]";
2872 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2873 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2874 return label;
2875 }
2876
2877 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2878 if (print_section_labels) {
2879 const char* label = nmethod_section_label(block_begin);
2880 if (label != NULL) {
2881 stream->bol();
2882 stream->print_cr("%s", label);
2883 }
2884 }
2885
2886 if (block_begin == entry_point()) {
2887 methodHandle m = method();
2888 if (m.not_null()) {
2889 stream->print(" # ");
2890 m->print_value_on(stream);
2891 stream->cr();
2892 }
2893 if (m.not_null() && !is_osr_method()) {
2894 ResourceMark rm;
2895 int sizeargs = m->size_of_parameters();
2896 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2897 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2898 {
2899 int sig_index = 0;
2900 if (!m->is_static())
2901 sig_bt[sig_index++] = T_OBJECT; // 'this'
2902 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2903 BasicType t = ss.type();
2904 sig_bt[sig_index++] = t;
2905 if (type2size[t] == 2) {
2906 sig_bt[sig_index++] = T_VOID;
2907 } else {
2908 assert(type2size[t] == 1, "size is 1 or 2");
2909 }
2910 }
2911 assert(sig_index == sizeargs, "");
2912 }
2913 const char* spname = "sp"; // make arch-specific?
2914 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2915 int stack_slot_offset = this->frame_size() * wordSize;
2916 int tab1 = 14, tab2 = 24;
2917 int sig_index = 0;
2918 int arg_index = (m->is_static() ? 0 : -1);
2919 bool did_old_sp = false;
2920 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2921 bool at_this = (arg_index == -1);
2922 bool at_old_sp = false;
2923 BasicType t = (at_this ? T_OBJECT : ss.type());
2924 assert(t == sig_bt[sig_index], "sigs in sync");
2925 if (at_this)
2926 stream->print(" # this: ");
2927 else
2928 stream->print(" # parm%d: ", arg_index);
2929 stream->move_to(tab1);
2930 VMReg fst = regs[sig_index].first();
2931 VMReg snd = regs[sig_index].second();
2932 if (fst->is_reg()) {
2933 stream->print("%s", fst->name());
2934 if (snd->is_valid()) {
2935 stream->print(":%s", snd->name());
2936 }
2937 } else if (fst->is_stack()) {
2938 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2939 if (offset == stack_slot_offset) at_old_sp = true;
2940 stream->print("[%s+0x%x]", spname, offset);
2941 } else {
2942 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2943 }
2944 stream->print(" ");
2945 stream->move_to(tab2);
2946 stream->print("= ");
2947 if (at_this) {
2948 m->method_holder()->print_value_on(stream);
2949 } else {
2950 bool did_name = false;
2951 if (!at_this && ss.is_object()) {
2952 Symbol* name = ss.as_symbol_or_null();
2953 if (name != NULL) {
2954 name->print_value_on(stream);
2955 did_name = true;
2956 }
2957 }
2958 if (!did_name)
2959 stream->print("%s", type2name(t));
2960 }
2961 if (at_old_sp) {
2962 stream->print(" (%s of caller)", spname);
2963 did_old_sp = true;
2964 }
2965 stream->cr();
2966 sig_index += type2size[t];
2967 arg_index += 1;
2968 if (!at_this) ss.next();
2969 }
2970 if (!did_old_sp) {
2971 stream->print(" # ");
2972 stream->move_to(tab1);
2973 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2974 stream->print(" (%s of caller)", spname);
2975 stream->cr();
2976 }
2977 }
2978 }
2979 }
2980
2981 // Returns whether this nmethod has code comments.
2982 bool nmethod::has_code_comment(address begin, address end) {
2983 // scopes?
2984 ScopeDesc* sd = scope_desc_in(begin, end);
2985 if (sd != NULL) return true;
2986
2987 // relocations?
2988 const char* str = reloc_string_for(begin, end);
2989 if (str != NULL) return true;
2990
2991 // implicit exceptions?
2992 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2993 if (cont_offset != 0) return true;
2994
2995 return false;
2996 }
2997
2998 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
2999 // First, find an oopmap in (begin, end].
3000 // We use the odd half-closed interval so that oop maps and scope descs
3001 // which are tied to the byte after a call are printed with the call itself.
3002 address base = code_begin();
3003 ImmutableOopMapSet* oms = oop_maps();
3004 if (oms != NULL) {
3005 for (int i = 0, imax = oms->count(); i < imax; i++) {
3006 const ImmutableOopMapPair* pair = oms->pair_at(i);
3007 const ImmutableOopMap* om = pair->get_from(oms);
3008 address pc = base + pair->pc_offset();
3009 if (pc > begin) {
3010 if (pc <= end) {
3011 st->move_to(column, 6, 0);
3012 st->print("; ");
3013 om->print_on(st);
3014 }
3015 break;
3016 }
3017 }
3018 }
3019
3020 // Print any debug info present at this pc.
3021 ScopeDesc* sd = scope_desc_in(begin, end);
3022 if (sd != NULL) {
3023 st->move_to(column, 6, 0);
3024 if (sd->bci() == SynchronizationEntryBCI) {
3025 st->print(";*synchronization entry");
3026 } else if (sd->bci() == AfterBci) {
3027 st->print(";* method exit (unlocked if synchronized)");
3028 } else if (sd->bci() == UnwindBci) {
3029 st->print(";* unwind (locked if synchronized)");
3030 } else if (sd->bci() == AfterExceptionBci) {
3031 st->print(";* unwind (unlocked if synchronized)");
3032 } else if (sd->bci() == UnknownBci) {
3033 st->print(";* unknown");
3034 } else if (sd->bci() == InvalidFrameStateBci) {
3035 st->print(";* invalid frame state");
3036 } else {
3037 if (sd->method() == NULL) {
3038 st->print("method is NULL");
3039 } else if (sd->method()->is_native()) {
3040 st->print("method is native");
3041 } else {
3042 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3043 st->print(";*%s", Bytecodes::name(bc));
3044 switch (bc) {
3045 case Bytecodes::_invokevirtual:
3046 case Bytecodes::_invokespecial:
3047 case Bytecodes::_invokestatic:
3048 case Bytecodes::_invokeinterface:
3049 {
3050 Bytecode_invoke invoke(sd->method(), sd->bci());
3051 st->print(" ");
3052 if (invoke.name() != NULL)
3053 invoke.name()->print_symbol_on(st);
3054 else
3055 st->print("<UNKNOWN>");
3056 break;
3057 }
3058 case Bytecodes::_getfield:
3059 case Bytecodes::_putfield:
3060 case Bytecodes::_getstatic:
3061 case Bytecodes::_putstatic:
3062 {
3063 Bytecode_field field(sd->method(), sd->bci());
3064 st->print(" ");
3065 if (field.name() != NULL)
3066 field.name()->print_symbol_on(st);
3067 else
3068 st->print("<UNKNOWN>");
3069 }
3070 default:
3071 break;
3072 }
3073 }
3074 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3075 }
3076
3077 // Print all scopes
3078 for (;sd != NULL; sd = sd->sender()) {
3079 st->move_to(column, 6, 0);
3080 st->print("; -");
3081 if (sd->should_reexecute()) {
3082 st->print(" (reexecute)");
3083 }
3084 if (sd->method() == NULL) {
3085 st->print("method is NULL");
3086 } else {
3087 sd->method()->print_short_name(st);
3088 }
3089 int lineno = sd->method()->line_number_from_bci(sd->bci());
3090 if (lineno != -1) {
3091 st->print("@%d (line %d)", sd->bci(), lineno);
3092 } else {
3093 st->print("@%d", sd->bci());
3094 }
3095 st->cr();
3096 }
3097 }
3098
3099 // Print relocation information
3100 // Prevent memory leak: allocating without ResourceMark.
3101 ResourceMark rm;
3102 const char* str = reloc_string_for(begin, end);
3103 if (str != NULL) {
3104 if (sd != NULL) st->cr();
3105 st->move_to(column, 6, 0);
3106 st->print("; {%s}", str);
3107 }
3108 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3109 if (cont_offset != 0) {
3110 st->move_to(column, 6, 0);
3111 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3112 }
3113
3114 }
3115
3116 #endif
3117
3118 class DirectNativeCallWrapper: public NativeCallWrapper {
3119 private:
3120 NativeCall* _call;
3121
3122 public:
3123 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3124
3125 virtual address destination() const { return _call->destination(); }
3126 virtual address instruction_address() const { return _call->instruction_address(); }
3127 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3128 virtual address return_address() const { return _call->return_address(); }
3129
3130 virtual address get_resolve_call_stub(bool is_optimized) const {
3131 if (is_optimized) {
3132 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3133 }
3134 return SharedRuntime::get_resolve_virtual_call_stub();
3135 }
3136
3137 virtual void set_destination_mt_safe(address dest) {
3138 #if INCLUDE_AOT
3139 if (UseAOT) {
3140 CodeBlob* callee = CodeCache::find_blob(dest);
3141 CompiledMethod* cm = callee->as_compiled_method_or_null();
3142 if (cm != NULL && cm->is_far_code()) {
3143 // Temporary fix, see JDK-8143106
3144 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3145 csc->set_to_far(methodHandle(cm->method()), dest);
3146 return;
3147 }
3148 }
3149 #endif
3150 _call->set_destination_mt_safe(dest);
3151 }
3152
3153 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3154 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3155 #if INCLUDE_AOT
3156 if (info.to_aot()) {
3157 csc->set_to_far(method, info.entry());
3158 } else
3159 #endif
3160 {
3161 csc->set_to_interpreted(method, info.entry());
3162 }
3163 }
3164
3165 virtual void verify() const {
3166 // make sure code pattern is actually a call imm32 instruction
3167 _call->verify();
3168 _call->verify_alignment();
3169 }
3170
3171 virtual void verify_resolve_call(address dest) const {
3172 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3173 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3174 }
3175
3176 virtual bool is_call_to_interpreted(address dest) const {
3177 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3178 return cb->contains(dest);
3179 }
3180
3181 virtual bool is_safe_for_patching() const { return false; }
3182
3183 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3184 return nativeMovConstReg_at(r->cached_value());
3185 }
3186
3187 virtual void *get_data(NativeInstruction* instruction) const {
3188 return (void*)((NativeMovConstReg*) instruction)->data();
3189 }
3190
3191 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3192 ((NativeMovConstReg*) instruction)->set_data(data);
3193 }
3194 };
3195
3196 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3197 return new DirectNativeCallWrapper((NativeCall*) call);
3198 }
3199
3200 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3201 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3202 }
3203
3204 address nmethod::call_instruction_address(address pc) const {
3205 if (NativeCall::is_call_before(pc)) {
3206 NativeCall *ncall = nativeCall_before(pc);
3207 return ncall->instruction_address();
3208 }
3209 return NULL;
3210 }
3211
3212 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3213 return CompiledDirectStaticCall::at(call_site);
3214 }
3215
3216 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3217 return CompiledDirectStaticCall::at(call_site);
3218 }
3219
3220 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3221 return CompiledDirectStaticCall::before(return_addr);
3222 }
3223
3224 #if defined(SUPPORT_DATA_STRUCTS)
3225 void nmethod::print_value_on(outputStream* st) const {
3226 st->print("nmethod");
3227 print_on(st, NULL);
3228 }
3229 #endif
3230
3231 #ifndef PRODUCT
3232
3233 void nmethod::print_calls(outputStream* st) {
3234 RelocIterator iter(this);
3235 while (iter.next()) {
3236 switch (iter.type()) {
3237 case relocInfo::virtual_call_type:
3238 case relocInfo::opt_virtual_call_type: {
3239 CompiledICLocker ml_verify(this);
3240 CompiledIC_at(&iter)->print();
3241 break;
3242 }
3243 case relocInfo::static_call_type:
3244 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3245 CompiledDirectStaticCall::at(iter.reloc())->print();
3246 break;
3247 default:
3248 break;
3249 }
3250 }
3251 }
3252
3253 void nmethod::print_statistics() {
3254 ttyLocker ttyl;
3255 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3256 native_nmethod_stats.print_native_nmethod_stats();
3257 #ifdef COMPILER1
3258 c1_java_nmethod_stats.print_nmethod_stats("C1");
3259 #endif
3260 #ifdef COMPILER2
3261 c2_java_nmethod_stats.print_nmethod_stats("C2");
3262 #endif
3263 #if INCLUDE_JVMCI
3264 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3265 #endif
3266 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3267 DebugInformationRecorder::print_statistics();
3268 #ifndef PRODUCT
3269 pc_nmethod_stats.print_pc_stats();
3270 #endif
3271 Dependencies::print_statistics();
3272 if (xtty != NULL) xtty->tail("statistics");
3273 }
3274
3275 #endif // !PRODUCT
3276
3277 #if INCLUDE_JVMCI
3278 void nmethod::clear_jvmci_installed_code() {
3279 assert_locked_or_safepoint(Patching_lock);
3280 if (_jvmci_installed_code != NULL) {
3281 JNIHandles::destroy_weak_global(_jvmci_installed_code);
3282 _jvmci_installed_code = NULL;
3283 }
3284 }
3285
3286 void nmethod::clear_speculation_log() {
3287 assert_locked_or_safepoint(Patching_lock);
3288 if (_speculation_log != NULL) {
3289 JNIHandles::destroy_weak_global(_speculation_log);
3290 _speculation_log = NULL;
3291 }
3292 }
3293
3294 void nmethod::maybe_invalidate_installed_code() {
3295 if (!is_compiled_by_jvmci()) {
3296 return;
3297 }
3298
3299 assert(Patching_lock->is_locked() ||
3300 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3301 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3302 if (installed_code != NULL) {
3303 // Update the values in the InstalledCode instance if it still refers to this nmethod
3304 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3305 if (nm == this) {
3306 if (!is_alive() || is_unloading()) {
3307 // Break the link between nmethod and InstalledCode such that the nmethod
3308 // can subsequently be flushed safely. The link must be maintained while
3309 // the method could have live activations since invalidateInstalledCode
3310 // might want to invalidate all existing activations.
3311 InstalledCode::set_address(installed_code, 0);
3312 InstalledCode::set_entryPoint(installed_code, 0);
3313 } else if (is_not_entrant()) {
3314 // Remove the entry point so any invocation will fail but keep
3315 // the address link around that so that existing activations can
3316 // be invalidated.
3317 InstalledCode::set_entryPoint(installed_code, 0);
3318 }
3319 }
3320 }
3321 if (!is_alive() || is_unloading()) {
3322 // Clear these out after the nmethod has been unregistered and any
3323 // updates to the InstalledCode instance have been performed.
3324 clear_jvmci_installed_code();
3325 clear_speculation_log();
3326 }
3327 }
3328
3329 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3330 if (installedCode() == NULL) {
3331 THROW(vmSymbols::java_lang_NullPointerException());
3332 }
3333 jlong nativeMethod = InstalledCode::address(installedCode);
3334 nmethod* nm = (nmethod*)nativeMethod;
3335 if (nm == NULL) {
3336 // Nothing to do
3337 return;
3338 }
3339
3340 nmethodLocker nml(nm);
3341 #ifdef ASSERT
3342 {
3343 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3344 // This relationship can only be checked safely under a lock
3345 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3346 }
3347 #endif
3348
3349 if (nm->is_alive()) {
3350 // Invalidating the InstalledCode means we want the nmethod
3351 // to be deoptimized.
3352 nm->mark_for_deoptimization();
3353 VM_Deoptimize op;
3354 VMThread::execute(&op);
3355 }
3356
3357 // Multiple threads could reach this point so we now need to
3358 // lock and re-check the link to the nmethod so that only one
3359 // thread clears it.
3360 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3361 if (InstalledCode::address(installedCode) == nativeMethod) {
3362 InstalledCode::set_address(installedCode, 0);
3363 }
3364 }
3365
3366 oop nmethod::jvmci_installed_code() {
3367 return JNIHandles::resolve(_jvmci_installed_code);
3368 }
3369
3370 oop nmethod::speculation_log() {
3371 return JNIHandles::resolve(_speculation_log);
3372 }
3373
3374 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
3375 if (!this->is_compiled_by_jvmci()) {
3376 return NULL;
3377 }
3378 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3379 if (installed_code != NULL) {
3380 oop installed_code_name = NULL;
3381 if (installed_code->is_a(InstalledCode::klass())) {
3382 installed_code_name = InstalledCode::name(installed_code);
3383 }
3384 if (installed_code_name != NULL) {
3385 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
3386 }
3387 }
3388 return NULL;
3389 }
3390 #endif