1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/compileLog.hpp"
36 #include "compiler/compilerDirectives.hpp"
37 #include "compiler/directivesParser.hpp"
38 #include "compiler/disassembler.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/methodData.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "prims/jvmtiImpl.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/orderAccess.inline.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/sweeper.hpp"
51 #include "utilities/align.hpp"
52 #include "utilities/dtrace.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/resourceHash.hpp"
55 #include "utilities/xmlstream.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciJavaClasses.hpp"
58 #endif
59
60 #ifdef DTRACE_ENABLED
61
62 // Only bother with this argument setup if dtrace is available
63
64 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
65 { \
66 Method* m = (method); \
67 if (m != NULL) { \
68 Symbol* klass_name = m->klass_name(); \
69 Symbol* name = m->name(); \
70 Symbol* signature = m->signature(); \
71 HOTSPOT_COMPILED_METHOD_UNLOAD( \
72 (char *) klass_name->bytes(), klass_name->utf8_length(), \
73 (char *) name->bytes(), name->utf8_length(), \
74 (char *) signature->bytes(), signature->utf8_length()); \
75 } \
76 }
77
78 #else // ndef DTRACE_ENABLED
79
80 #define DTRACE_METHOD_UNLOAD_PROBE(method)
81
82 #endif
83
84 //---------------------------------------------------------------------------------
85 // NMethod statistics
86 // They are printed under various flags, including:
87 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
88 // (In the latter two cases, they like other stats are printed to the log only.)
89
90 #ifndef PRODUCT
91 // These variables are put into one block to reduce relocations
92 // and make it simpler to print from the debugger.
93 struct java_nmethod_stats_struct {
94 int nmethod_count;
95 int total_size;
96 int relocation_size;
97 int consts_size;
98 int insts_size;
99 int stub_size;
100 int scopes_data_size;
101 int scopes_pcs_size;
102 int dependencies_size;
103 int handler_table_size;
104 int nul_chk_table_size;
105 int oops_size;
106 int metadata_size;
107
108 void note_nmethod(nmethod* nm) {
109 nmethod_count += 1;
110 total_size += nm->size();
111 relocation_size += nm->relocation_size();
112 consts_size += nm->consts_size();
113 insts_size += nm->insts_size();
114 stub_size += nm->stub_size();
115 oops_size += nm->oops_size();
116 metadata_size += nm->metadata_size();
117 scopes_data_size += nm->scopes_data_size();
118 scopes_pcs_size += nm->scopes_pcs_size();
119 dependencies_size += nm->dependencies_size();
120 handler_table_size += nm->handler_table_size();
121 nul_chk_table_size += nm->nul_chk_table_size();
122 }
123 void print_nmethod_stats(const char* name) {
124 if (nmethod_count == 0) return;
125 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
126 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
127 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
128 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
129 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
130 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
131 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
132 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
133 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
134 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
135 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
136 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
137 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
138 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
139 }
140 };
141
142 struct native_nmethod_stats_struct {
143 int native_nmethod_count;
144 int native_total_size;
145 int native_relocation_size;
146 int native_insts_size;
147 int native_oops_size;
148 int native_metadata_size;
149 void note_native_nmethod(nmethod* nm) {
150 native_nmethod_count += 1;
151 native_total_size += nm->size();
152 native_relocation_size += nm->relocation_size();
153 native_insts_size += nm->insts_size();
154 native_oops_size += nm->oops_size();
155 native_metadata_size += nm->metadata_size();
156 }
157 void print_native_nmethod_stats() {
158 if (native_nmethod_count == 0) return;
159 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
160 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
161 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
162 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
163 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
164 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
165 }
166 };
167
168 struct pc_nmethod_stats_struct {
169 int pc_desc_resets; // number of resets (= number of caches)
170 int pc_desc_queries; // queries to nmethod::find_pc_desc
171 int pc_desc_approx; // number of those which have approximate true
172 int pc_desc_repeats; // number of _pc_descs[0] hits
173 int pc_desc_hits; // number of LRU cache hits
174 int pc_desc_tests; // total number of PcDesc examinations
175 int pc_desc_searches; // total number of quasi-binary search steps
176 int pc_desc_adds; // number of LUR cache insertions
177
178 void print_pc_stats() {
179 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
180 pc_desc_queries,
181 (double)(pc_desc_tests + pc_desc_searches)
182 / pc_desc_queries);
183 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
184 pc_desc_resets,
185 pc_desc_queries, pc_desc_approx,
186 pc_desc_repeats, pc_desc_hits,
187 pc_desc_tests, pc_desc_searches, pc_desc_adds);
188 }
189 };
190
191 #ifdef COMPILER1
192 static java_nmethod_stats_struct c1_java_nmethod_stats;
193 #endif
194 #ifdef COMPILER2
195 static java_nmethod_stats_struct c2_java_nmethod_stats;
196 #endif
197 #if INCLUDE_JVMCI
198 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
199 #endif
200 static java_nmethod_stats_struct unknown_java_nmethod_stats;
201
202 static native_nmethod_stats_struct native_nmethod_stats;
203 static pc_nmethod_stats_struct pc_nmethod_stats;
204
205 static void note_java_nmethod(nmethod* nm) {
206 #ifdef COMPILER1
207 if (nm->is_compiled_by_c1()) {
208 c1_java_nmethod_stats.note_nmethod(nm);
209 } else
210 #endif
211 #ifdef COMPILER2
212 if (nm->is_compiled_by_c2()) {
213 c2_java_nmethod_stats.note_nmethod(nm);
214 } else
215 #endif
216 #if INCLUDE_JVMCI
217 if (nm->is_compiled_by_jvmci()) {
218 jvmci_java_nmethod_stats.note_nmethod(nm);
219 } else
220 #endif
221 {
222 unknown_java_nmethod_stats.note_nmethod(nm);
223 }
224 }
225 #endif // !PRODUCT
226
227 //---------------------------------------------------------------------------------
228
229
230 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
231 assert(pc != NULL, "Must be non null");
232 assert(exception.not_null(), "Must be non null");
233 assert(handler != NULL, "Must be non null");
234
235 _count = 0;
236 _exception_type = exception->klass();
237 _next = NULL;
238
239 add_address_and_handler(pc,handler);
240 }
241
242
243 address ExceptionCache::match(Handle exception, address pc) {
244 assert(pc != NULL,"Must be non null");
245 assert(exception.not_null(),"Must be non null");
246 if (exception->klass() == exception_type()) {
247 return (test_address(pc));
248 }
249
250 return NULL;
251 }
252
253
254 bool ExceptionCache::match_exception_with_space(Handle exception) {
255 assert(exception.not_null(),"Must be non null");
256 if (exception->klass() == exception_type() && count() < cache_size) {
257 return true;
258 }
259 return false;
260 }
261
262
263 address ExceptionCache::test_address(address addr) {
264 int limit = count();
265 for (int i = 0; i < limit; i++) {
266 if (pc_at(i) == addr) {
267 return handler_at(i);
268 }
269 }
270 return NULL;
271 }
272
273
274 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
275 if (test_address(addr) == handler) return true;
276
277 int index = count();
278 if (index < cache_size) {
279 set_pc_at(index, addr);
280 set_handler_at(index, handler);
281 increment_count();
282 return true;
283 }
284 return false;
285 }
286
287 //-----------------------------------------------------------------------------
288
289
290 // Helper used by both find_pc_desc methods.
291 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
292 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
293 if (!approximate)
294 return pc->pc_offset() == pc_offset;
295 else
296 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
297 }
298
299 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
300 if (initial_pc_desc == NULL) {
301 _pc_descs[0] = NULL; // native method; no PcDescs at all
302 return;
303 }
304 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
305 // reset the cache by filling it with benign (non-null) values
306 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
307 for (int i = 0; i < cache_size; i++)
308 _pc_descs[i] = initial_pc_desc;
309 }
310
311 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
313 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
314
315 // Note: one might think that caching the most recently
316 // read value separately would be a win, but one would be
317 // wrong. When many threads are updating it, the cache
318 // line it's in would bounce between caches, negating
319 // any benefit.
320
321 // In order to prevent race conditions do not load cache elements
322 // repeatedly, but use a local copy:
323 PcDesc* res;
324
325 // Step one: Check the most recently added value.
326 res = _pc_descs[0];
327 if (res == NULL) return NULL; // native method; no PcDescs at all
328 if (match_desc(res, pc_offset, approximate)) {
329 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
330 return res;
331 }
332
333 // Step two: Check the rest of the LRU cache.
334 for (int i = 1; i < cache_size; ++i) {
335 res = _pc_descs[i];
336 if (res->pc_offset() < 0) break; // optimization: skip empty cache
337 if (match_desc(res, pc_offset, approximate)) {
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
339 return res;
340 }
341 }
342
343 // Report failure.
344 return NULL;
345 }
346
347 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
349 // Update the LRU cache by shifting pc_desc forward.
350 for (int i = 0; i < cache_size; i++) {
351 PcDesc* next = _pc_descs[i];
352 _pc_descs[i] = pc_desc;
353 pc_desc = next;
354 }
355 }
356
357 // adjust pcs_size so that it is a multiple of both oopSize and
358 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
359 // of oopSize, then 2*sizeof(PcDesc) is)
360 static int adjust_pcs_size(int pcs_size) {
361 int nsize = align_up(pcs_size, oopSize);
362 if ((nsize % sizeof(PcDesc)) != 0) {
363 nsize = pcs_size + sizeof(PcDesc);
364 }
365 assert((nsize % oopSize) == 0, "correct alignment");
366 return nsize;
367 }
368
369
370 int nmethod::total_size() const {
371 return
372 consts_size() +
373 insts_size() +
374 stub_size() +
375 scopes_data_size() +
376 scopes_pcs_size() +
377 handler_table_size() +
378 nul_chk_table_size();
379 }
380
381 const char* nmethod::compile_kind() const {
382 if (is_osr_method()) return "osr";
383 if (method() != NULL && is_native_method()) return "c2n";
384 return NULL;
385 }
386
387 // Fill in default values for various flag fields
388 void nmethod::init_defaults() {
389 _state = not_installed;
390 _has_flushed_dependencies = 0;
391 _lock_count = 0;
392 _stack_traversal_mark = 0;
393 _unload_reported = false; // jvmti state
394 _is_far_code = false; // nmethods are located in CodeCache
395
396 #ifdef ASSERT
397 _oops_are_stale = false;
398 #endif
399
400 _oops_do_mark_link = NULL;
401 _jmethod_id = NULL;
402 _osr_link = NULL;
403 _unloading_next = NULL;
404 _scavenge_root_link = NULL;
405 _scavenge_root_state = 0;
406 #if INCLUDE_RTM_OPT
407 _rtm_state = NoRTM;
408 #endif
409 #if INCLUDE_JVMCI
410 _jvmci_installed_code = NULL;
411 _speculation_log = NULL;
412 _jvmci_installed_code_triggers_unloading = false;
413 #endif
414 }
415
416 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
417 int compile_id,
418 CodeBuffer *code_buffer,
419 int vep_offset,
420 int frame_complete,
421 int frame_size,
422 ByteSize basic_lock_owner_sp_offset,
423 ByteSize basic_lock_sp_offset,
424 OopMapSet* oop_maps) {
425 code_buffer->finalize_oop_references(method);
426 // create nmethod
427 nmethod* nm = NULL;
428 {
429 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
430 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
431 CodeOffsets offsets;
432 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
433 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
434 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
435 compile_id, &offsets,
436 code_buffer, frame_size,
437 basic_lock_owner_sp_offset,
438 basic_lock_sp_offset, oop_maps);
439 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
440 }
441
442 if (nm != NULL) {
443 // verify nmethod
444 debug_only(nm->verify();) // might block
445
446 nm->log_new_nmethod();
447 nm->make_in_use();
448 }
449 return nm;
450 }
451
452 nmethod* nmethod::new_nmethod(const methodHandle& method,
453 int compile_id,
454 int entry_bci,
455 CodeOffsets* offsets,
456 int orig_pc_offset,
457 DebugInformationRecorder* debug_info,
458 Dependencies* dependencies,
459 CodeBuffer* code_buffer, int frame_size,
460 OopMapSet* oop_maps,
461 ExceptionHandlerTable* handler_table,
462 ImplicitExceptionTable* nul_chk_table,
463 AbstractCompiler* compiler,
464 int comp_level
465 #if INCLUDE_JVMCI
466 , jweak installed_code,
467 jweak speculationLog
468 #endif
469 )
470 {
471 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
472 code_buffer->finalize_oop_references(method);
473 // create nmethod
474 nmethod* nm = NULL;
475 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
476 int nmethod_size =
477 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
478 + adjust_pcs_size(debug_info->pcs_size())
479 + align_up((int)dependencies->size_in_bytes(), oopSize)
480 + align_up(handler_table->size_in_bytes() , oopSize)
481 + align_up(nul_chk_table->size_in_bytes() , oopSize)
482 + align_up(debug_info->data_size() , oopSize);
483
484 nm = new (nmethod_size, comp_level)
485 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
486 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
487 oop_maps,
488 handler_table,
489 nul_chk_table,
490 compiler,
491 comp_level
492 #if INCLUDE_JVMCI
493 , installed_code,
494 speculationLog
495 #endif
496 );
497
498 if (nm != NULL) {
499 // To make dependency checking during class loading fast, record
500 // the nmethod dependencies in the classes it is dependent on.
501 // This allows the dependency checking code to simply walk the
502 // class hierarchy above the loaded class, checking only nmethods
503 // which are dependent on those classes. The slow way is to
504 // check every nmethod for dependencies which makes it linear in
505 // the number of methods compiled. For applications with a lot
506 // classes the slow way is too slow.
507 for (Dependencies::DepStream deps(nm); deps.next(); ) {
508 if (deps.type() == Dependencies::call_site_target_value) {
509 // CallSite dependencies are managed on per-CallSite instance basis.
510 oop call_site = deps.argument_oop(0);
511 MethodHandles::add_dependent_nmethod(call_site, nm);
512 } else {
513 Klass* klass = deps.context_type();
514 if (klass == NULL) {
515 continue; // ignore things like evol_method
516 }
517 // record this nmethod as dependent on this klass
518 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
519 }
520 }
521 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
522 }
523 }
524 // Do verification and logging outside CodeCache_lock.
525 if (nm != NULL) {
526 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
527 DEBUG_ONLY(nm->verify();)
528 nm->log_new_nmethod();
529 }
530 return nm;
531 }
532
533 // For native wrappers
534 nmethod::nmethod(
535 Method* method,
536 CompilerType type,
537 int nmethod_size,
538 int compile_id,
539 CodeOffsets* offsets,
540 CodeBuffer* code_buffer,
541 int frame_size,
542 ByteSize basic_lock_owner_sp_offset,
543 ByteSize basic_lock_sp_offset,
544 OopMapSet* oop_maps )
545 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
546 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
547 _native_basic_lock_sp_offset(basic_lock_sp_offset)
548 {
549 {
550 int scopes_data_offset = 0;
551 int deoptimize_offset = 0;
552 int deoptimize_mh_offset = 0;
553
554 debug_only(NoSafepointVerifier nsv;)
555 assert_locked_or_safepoint(CodeCache_lock);
556
557 init_defaults();
558 _entry_bci = InvocationEntryBci;
559 // We have no exception handler or deopt handler make the
560 // values something that will never match a pc like the nmethod vtable entry
561 _exception_offset = 0;
562 _orig_pc_offset = 0;
563
564 _consts_offset = data_offset();
565 _stub_offset = data_offset();
566 _oops_offset = data_offset();
567 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
568 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
569 _scopes_pcs_offset = scopes_data_offset;
570 _dependencies_offset = _scopes_pcs_offset;
571 _handler_table_offset = _dependencies_offset;
572 _nul_chk_table_offset = _handler_table_offset;
573 _nmethod_end_offset = _nul_chk_table_offset;
574 _compile_id = compile_id;
575 _comp_level = CompLevel_none;
576 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
577 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
578 _osr_entry_point = NULL;
579 _exception_cache = NULL;
580 _pc_desc_container.reset_to(NULL);
581 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
582
583 _scopes_data_begin = (address) this + scopes_data_offset;
584 _deopt_handler_begin = (address) this + deoptimize_offset;
585 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
586
587 code_buffer->copy_code_and_locs_to(this);
588 code_buffer->copy_values_to(this);
589 if (ScavengeRootsInCode) {
590 Universe::heap()->register_nmethod(this);
591 }
592 debug_only(Universe::heap()->verify_nmethod(this));
593 CodeCache::commit(this);
594 }
595
596 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
597 ttyLocker ttyl; // keep the following output all in one block
598 // This output goes directly to the tty, not the compiler log.
599 // To enable tools to match it up with the compilation activity,
600 // be sure to tag this tty output with the compile ID.
601 if (xtty != NULL) {
602 xtty->begin_head("print_native_nmethod");
603 xtty->method(_method);
604 xtty->stamp();
605 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
606 }
607 // print the header part first
608 print();
609 // then print the requested information
610 if (PrintNativeNMethods) {
611 print_code();
612 if (oop_maps != NULL) {
613 oop_maps->print();
614 }
615 }
616 if (PrintRelocations) {
617 print_relocations();
618 }
619 if (xtty != NULL) {
620 xtty->tail("print_native_nmethod");
621 }
622 }
623 }
624
625 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
626 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
627 }
628
629 nmethod::nmethod(
630 Method* method,
631 CompilerType type,
632 int nmethod_size,
633 int compile_id,
634 int entry_bci,
635 CodeOffsets* offsets,
636 int orig_pc_offset,
637 DebugInformationRecorder* debug_info,
638 Dependencies* dependencies,
639 CodeBuffer *code_buffer,
640 int frame_size,
641 OopMapSet* oop_maps,
642 ExceptionHandlerTable* handler_table,
643 ImplicitExceptionTable* nul_chk_table,
644 AbstractCompiler* compiler,
645 int comp_level
646 #if INCLUDE_JVMCI
647 , jweak installed_code,
648 jweak speculation_log
649 #endif
650 )
651 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
652 _native_receiver_sp_offset(in_ByteSize(-1)),
653 _native_basic_lock_sp_offset(in_ByteSize(-1))
654 {
655 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
656 {
657 debug_only(NoSafepointVerifier nsv;)
658 assert_locked_or_safepoint(CodeCache_lock);
659
660 _deopt_handler_begin = (address) this;
661 _deopt_mh_handler_begin = (address) this;
662
663 init_defaults();
664 _entry_bci = entry_bci;
665 _compile_id = compile_id;
666 _comp_level = comp_level;
667 _orig_pc_offset = orig_pc_offset;
668 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
669
670 // Section offsets
671 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
672 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
673 set_ctable_begin(header_begin() + _consts_offset);
674
675 #if INCLUDE_JVMCI
676 _jvmci_installed_code = installed_code;
677 _speculation_log = speculation_log;
678 oop obj = JNIHandles::resolve(installed_code);
679 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
680 _jvmci_installed_code_triggers_unloading = false;
681 } else {
682 _jvmci_installed_code_triggers_unloading = true;
683 }
684
685 if (compiler->is_jvmci()) {
686 // JVMCI might not produce any stub sections
687 if (offsets->value(CodeOffsets::Exceptions) != -1) {
688 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
689 } else {
690 _exception_offset = -1;
691 }
692 if (offsets->value(CodeOffsets::Deopt) != -1) {
693 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
694 } else {
695 _deopt_handler_begin = NULL;
696 }
697 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
698 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
699 } else {
700 _deopt_mh_handler_begin = NULL;
701 }
702 } else {
703 #endif
704 // Exception handler and deopt handler are in the stub section
705 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
706 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
707
708 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
709 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
710 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
711 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
712 } else {
713 _deopt_mh_handler_begin = NULL;
714 #if INCLUDE_JVMCI
715 }
716 #endif
717 }
718 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
719 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
720 } else {
721 _unwind_handler_offset = -1;
722 }
723
724 _oops_offset = data_offset();
725 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
726 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
727
728 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
729 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
730 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
731 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
732 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
733 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
734 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
735 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
736 _exception_cache = NULL;
737
738 _scopes_data_begin = (address) this + scopes_data_offset;
739
740 _pc_desc_container.reset_to(scopes_pcs_begin());
741
742 code_buffer->copy_code_and_locs_to(this);
743 // Copy contents of ScopeDescRecorder to nmethod
744 code_buffer->copy_values_to(this);
745 debug_info->copy_to(this);
746 dependencies->copy_to(this);
747 if (ScavengeRootsInCode) {
748 Universe::heap()->register_nmethod(this);
749 }
750 debug_only(Universe::heap()->verify_nmethod(this));
751
752 CodeCache::commit(this);
753
754 // Copy contents of ExceptionHandlerTable to nmethod
755 handler_table->copy_to(this);
756 nul_chk_table->copy_to(this);
757
758 // we use the information of entry points to find out if a method is
759 // static or non static
760 assert(compiler->is_c2() || compiler->is_jvmci() ||
761 _method->is_static() == (entry_point() == _verified_entry_point),
762 " entry points must be same for static methods and vice versa");
763 }
764 }
765
766 // Print a short set of xml attributes to identify this nmethod. The
767 // output should be embedded in some other element.
768 void nmethod::log_identity(xmlStream* log) const {
769 log->print(" compile_id='%d'", compile_id());
770 const char* nm_kind = compile_kind();
771 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
772 log->print(" compiler='%s'", compiler_name());
773 if (TieredCompilation) {
774 log->print(" level='%d'", comp_level());
775 }
776 }
777
778
779 #define LOG_OFFSET(log, name) \
780 if (p2i(name##_end()) - p2i(name##_begin())) \
781 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
782 p2i(name##_begin()) - p2i(this))
783
784
785 void nmethod::log_new_nmethod() const {
786 if (LogCompilation && xtty != NULL) {
787 ttyLocker ttyl;
788 HandleMark hm;
789 xtty->begin_elem("nmethod");
790 log_identity(xtty);
791 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
792 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
793
794 LOG_OFFSET(xtty, relocation);
795 LOG_OFFSET(xtty, consts);
796 LOG_OFFSET(xtty, insts);
797 LOG_OFFSET(xtty, stub);
798 LOG_OFFSET(xtty, scopes_data);
799 LOG_OFFSET(xtty, scopes_pcs);
800 LOG_OFFSET(xtty, dependencies);
801 LOG_OFFSET(xtty, handler_table);
802 LOG_OFFSET(xtty, nul_chk_table);
803 LOG_OFFSET(xtty, oops);
804 LOG_OFFSET(xtty, metadata);
805
806 xtty->method(method());
807 xtty->stamp();
808 xtty->end_elem();
809 }
810 }
811
812 #undef LOG_OFFSET
813
814
815 // Print out more verbose output usually for a newly created nmethod.
816 void nmethod::print_on(outputStream* st, const char* msg) const {
817 if (st != NULL) {
818 ttyLocker ttyl;
819 if (WizardMode) {
820 CompileTask::print(st, this, msg, /*short_form:*/ true);
821 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
822 } else {
823 CompileTask::print(st, this, msg, /*short_form:*/ false);
824 }
825 }
826 }
827
828 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
829 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
830 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
831 print_nmethod(printnmethods);
832 }
833 }
834
835 void nmethod::print_nmethod(bool printmethod) {
836 ttyLocker ttyl; // keep the following output all in one block
837 if (xtty != NULL) {
838 xtty->begin_head("print_nmethod");
839 xtty->stamp();
840 xtty->end_head();
841 }
842 // print the header part first
843 print();
844 // then print the requested information
845 if (printmethod) {
846 print_code();
847 print_pcs();
848 if (oop_maps()) {
849 oop_maps()->print();
850 }
851 }
852 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
853 print_scopes();
854 }
855 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
856 print_relocations();
857 }
858 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
859 print_dependencies();
860 }
861 if (printmethod || PrintExceptionHandlers) {
862 print_handler_table();
863 print_nul_chk_table();
864 }
865 if (printmethod) {
866 print_recorded_oops();
867 print_recorded_metadata();
868 }
869 if (xtty != NULL) {
870 xtty->tail("print_nmethod");
871 }
872 }
873
874
875 // Promote one word from an assembly-time handle to a live embedded oop.
876 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
877 if (handle == NULL ||
878 // As a special case, IC oops are initialized to 1 or -1.
879 handle == (jobject) Universe::non_oop_word()) {
880 (*dest) = (oop) handle;
881 } else {
882 (*dest) = JNIHandles::resolve_non_null(handle);
883 }
884 }
885
886
887 // Have to have the same name because it's called by a template
888 void nmethod::copy_values(GrowableArray<jobject>* array) {
889 int length = array->length();
890 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
891 oop* dest = oops_begin();
892 for (int index = 0 ; index < length; index++) {
893 initialize_immediate_oop(&dest[index], array->at(index));
894 }
895
896 // Now we can fix up all the oops in the code. We need to do this
897 // in the code because the assembler uses jobjects as placeholders.
898 // The code and relocations have already been initialized by the
899 // CodeBlob constructor, so it is valid even at this early point to
900 // iterate over relocations and patch the code.
901 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
902 }
903
904 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
905 int length = array->length();
906 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
907 Metadata** dest = metadata_begin();
908 for (int index = 0 ; index < length; index++) {
909 dest[index] = array->at(index);
910 }
911 }
912
913 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
914 // re-patch all oop-bearing instructions, just in case some oops moved
915 RelocIterator iter(this, begin, end);
916 while (iter.next()) {
917 if (iter.type() == relocInfo::oop_type) {
918 oop_Relocation* reloc = iter.oop_reloc();
919 if (initialize_immediates && reloc->oop_is_immediate()) {
920 oop* dest = reloc->oop_addr();
921 initialize_immediate_oop(dest, (jobject) *dest);
922 }
923 // Refresh the oop-related bits of this instruction.
924 reloc->fix_oop_relocation();
925 } else if (iter.type() == relocInfo::metadata_type) {
926 metadata_Relocation* reloc = iter.metadata_reloc();
927 reloc->fix_metadata_relocation();
928 }
929 }
930 }
931
932
933 void nmethod::verify_clean_inline_caches() {
934 assert_locked_or_safepoint(CompiledIC_lock);
935
936 // If the method is not entrant or zombie then a JMP is plastered over the
937 // first few bytes. If an oop in the old code was there, that oop
938 // should not get GC'd. Skip the first few bytes of oops on
939 // not-entrant methods.
940 address low_boundary = verified_entry_point();
941 if (!is_in_use()) {
942 low_boundary += NativeJump::instruction_size;
943 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
944 // This means that the low_boundary is going to be a little too high.
945 // This shouldn't matter, since oops of non-entrant methods are never used.
946 // In fact, why are we bothering to look at oops in a non-entrant method??
947 }
948
949 ResourceMark rm;
950 RelocIterator iter(this, low_boundary);
951 while(iter.next()) {
952 switch(iter.type()) {
953 case relocInfo::virtual_call_type:
954 case relocInfo::opt_virtual_call_type: {
955 CompiledIC *ic = CompiledIC_at(&iter);
956 // Ok, to lookup references to zombies here
957 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
958 nmethod* nm = cb->as_nmethod_or_null();
959 if( nm != NULL ) {
960 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
961 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
962 assert(ic->is_clean(), "IC should be clean");
963 }
964 }
965 break;
966 }
967 case relocInfo::static_call_type: {
968 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
969 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
970 nmethod* nm = cb->as_nmethod_or_null();
971 if( nm != NULL ) {
972 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
973 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
974 assert(csc->is_clean(), "IC should be clean");
975 }
976 }
977 break;
978 }
979 default:
980 break;
981 }
982 }
983 }
984
985 // This is a private interface with the sweeper.
986 void nmethod::mark_as_seen_on_stack() {
987 assert(is_alive(), "Must be an alive method");
988 // Set the traversal mark to ensure that the sweeper does 2
989 // cleaning passes before moving to zombie.
990 set_stack_traversal_mark(NMethodSweeper::traversal_count());
991 }
992
993 // Tell if a non-entrant method can be converted to a zombie (i.e.,
994 // there are no activations on the stack, not in use by the VM,
995 // and not in use by the ServiceThread)
996 bool nmethod::can_convert_to_zombie() {
997 assert(is_not_entrant(), "must be a non-entrant method");
998
999 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1000 // count can be greater than the stack traversal count before it hits the
1001 // nmethod for the second time.
1002 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1003 !is_locked_by_vm();
1004 }
1005
1006 void nmethod::inc_decompile_count() {
1007 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1008 // Could be gated by ProfileTraps, but do not bother...
1009 Method* m = method();
1010 if (m == NULL) return;
1011 MethodData* mdo = m->method_data();
1012 if (mdo == NULL) return;
1013 // There is a benign race here. See comments in methodData.hpp.
1014 mdo->inc_decompile_count();
1015 }
1016
1017 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1018
1019 post_compiled_method_unload();
1020
1021 // Since this nmethod is being unloaded, make sure that dependencies
1022 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1023 // indicate that this work is being done during a GC.
1024 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1025 assert(is_alive != NULL, "Should be non-NULL");
1026 // A non-NULL is_alive closure indicates that this is being called during GC.
1027 flush_dependencies(is_alive);
1028
1029 // Break cycle between nmethod & method
1030 LogTarget(Trace, class, unload) lt;
1031 if (lt.is_enabled()) {
1032 LogStream ls(lt);
1033 ls.print_cr("making nmethod " INTPTR_FORMAT
1034 " unloadable, Method*(" INTPTR_FORMAT
1035 "), cause(" INTPTR_FORMAT ")",
1036 p2i(this), p2i(_method), p2i(cause));
1037 }
1038 // Unlink the osr method, so we do not look this up again
1039 if (is_osr_method()) {
1040 // Invalidate the osr nmethod only once
1041 if (is_in_use()) {
1042 invalidate_osr_method();
1043 }
1044 #ifdef ASSERT
1045 if (method() != NULL) {
1046 // Make sure osr nmethod is invalidated, i.e. not on the list
1047 bool found = method()->method_holder()->remove_osr_nmethod(this);
1048 assert(!found, "osr nmethod should have been invalidated");
1049 }
1050 #endif
1051 }
1052
1053 // If _method is already NULL the Method* is about to be unloaded,
1054 // so we don't have to break the cycle. Note that it is possible to
1055 // have the Method* live here, in case we unload the nmethod because
1056 // it is pointing to some oop (other than the Method*) being unloaded.
1057 if (_method != NULL) {
1058 // OSR methods point to the Method*, but the Method* does not
1059 // point back!
1060 if (_method->code() == this) {
1061 _method->clear_code(); // Break a cycle
1062 }
1063 _method = NULL; // Clear the method of this dead nmethod
1064 }
1065
1066 // Make the class unloaded - i.e., change state and notify sweeper
1067 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1068 if (is_in_use()) {
1069 // Transitioning directly from live to unloaded -- so
1070 // we need to force a cache clean-up; remember this
1071 // for later on.
1072 CodeCache::set_needs_cache_clean(true);
1073 }
1074
1075 // Unregister must be done before the state change
1076 Universe::heap()->unregister_nmethod(this);
1077
1078 _state = unloaded;
1079
1080 // Log the unloading.
1081 log_state_change();
1082
1083 #if INCLUDE_JVMCI
1084 // The method can only be unloaded after the pointer to the installed code
1085 // Java wrapper is no longer alive. Here we need to clear out this weak
1086 // reference to the dead object.
1087 maybe_invalidate_installed_code();
1088 #endif
1089
1090 // The Method* is gone at this point
1091 assert(_method == NULL, "Tautology");
1092
1093 set_osr_link(NULL);
1094 NMethodSweeper::report_state_change(this);
1095 }
1096
1097 void nmethod::invalidate_osr_method() {
1098 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1099 // Remove from list of active nmethods
1100 if (method() != NULL) {
1101 method()->method_holder()->remove_osr_nmethod(this);
1102 }
1103 }
1104
1105 void nmethod::log_state_change() const {
1106 if (LogCompilation) {
1107 if (xtty != NULL) {
1108 ttyLocker ttyl; // keep the following output all in one block
1109 if (_state == unloaded) {
1110 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1111 os::current_thread_id());
1112 } else {
1113 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1114 os::current_thread_id(),
1115 (_state == zombie ? " zombie='1'" : ""));
1116 }
1117 log_identity(xtty);
1118 xtty->stamp();
1119 xtty->end_elem();
1120 }
1121 }
1122
1123 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1124 CompileTask::print_ul(this, state_msg);
1125 if (PrintCompilation && _state != unloaded) {
1126 print_on(tty, state_msg);
1127 }
1128 }
1129
1130 /**
1131 * Common functionality for both make_not_entrant and make_zombie
1132 */
1133 bool nmethod::make_not_entrant_or_zombie(int state) {
1134 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1135 assert(!is_zombie(), "should not already be a zombie");
1136
1137 if (_state == state) {
1138 // Avoid taking the lock if already in required state.
1139 // This is safe from races because the state is an end-state,
1140 // which the nmethod cannot back out of once entered.
1141 // No need for fencing either.
1142 return false;
1143 }
1144
1145 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1146 nmethodLocker nml(this);
1147 methodHandle the_method(method());
1148 NoSafepointVerifier nsv;
1149
1150 // during patching, depending on the nmethod state we must notify the GC that
1151 // code has been unloaded, unregistering it. We cannot do this right while
1152 // holding the Patching_lock because we need to use the CodeCache_lock. This
1153 // would be prone to deadlocks.
1154 // This flag is used to remember whether we need to later lock and unregister.
1155 bool nmethod_needs_unregister = false;
1156
1157 {
1158 // invalidate osr nmethod before acquiring the patching lock since
1159 // they both acquire leaf locks and we don't want a deadlock.
1160 // This logic is equivalent to the logic below for patching the
1161 // verified entry point of regular methods. We check that the
1162 // nmethod is in use to ensure that it is invalidated only once.
1163 if (is_osr_method() && is_in_use()) {
1164 // this effectively makes the osr nmethod not entrant
1165 invalidate_osr_method();
1166 }
1167
1168 // Enter critical section. Does not block for safepoint.
1169 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1170
1171 if (_state == state) {
1172 // another thread already performed this transition so nothing
1173 // to do, but return false to indicate this.
1174 return false;
1175 }
1176
1177 // The caller can be calling the method statically or through an inline
1178 // cache call.
1179 if (!is_osr_method() && !is_not_entrant()) {
1180 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1181 SharedRuntime::get_handle_wrong_method_stub());
1182 }
1183
1184 if (is_in_use() && update_recompile_counts()) {
1185 // It's a true state change, so mark the method as decompiled.
1186 // Do it only for transition from alive.
1187 inc_decompile_count();
1188 }
1189
1190 // If the state is becoming a zombie, signal to unregister the nmethod with
1191 // the heap.
1192 // This nmethod may have already been unloaded during a full GC.
1193 if ((state == zombie) && !is_unloaded()) {
1194 nmethod_needs_unregister = true;
1195 }
1196
1197 // Must happen before state change. Otherwise we have a race condition in
1198 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1199 // transition its state from 'not_entrant' to 'zombie' without having to wait
1200 // for stack scanning.
1201 if (state == not_entrant) {
1202 mark_as_seen_on_stack();
1203 OrderAccess::storestore(); // _stack_traversal_mark and _state
1204 }
1205
1206 // Change state
1207 _state = state;
1208
1209 // Log the transition once
1210 log_state_change();
1211
1212 // Invalidate while holding the patching lock
1213 JVMCI_ONLY(maybe_invalidate_installed_code());
1214
1215 // Remove nmethod from method.
1216 // We need to check if both the _code and _from_compiled_code_entry_point
1217 // refer to this nmethod because there is a race in setting these two fields
1218 // in Method* as seen in bugid 4947125.
1219 // If the vep() points to the zombie nmethod, the memory for the nmethod
1220 // could be flushed and the compiler and vtable stubs could still call
1221 // through it.
1222 if (method() != NULL && (method()->code() == this ||
1223 method()->from_compiled_entry() == verified_entry_point())) {
1224 HandleMark hm;
1225 method()->clear_code(false /* already owns Patching_lock */);
1226 }
1227 } // leave critical region under Patching_lock
1228
1229 #ifdef ASSERT
1230 if (is_osr_method() && method() != NULL) {
1231 // Make sure osr nmethod is invalidated, i.e. not on the list
1232 bool found = method()->method_holder()->remove_osr_nmethod(this);
1233 assert(!found, "osr nmethod should have been invalidated");
1234 }
1235 #endif
1236
1237 // When the nmethod becomes zombie it is no longer alive so the
1238 // dependencies must be flushed. nmethods in the not_entrant
1239 // state will be flushed later when the transition to zombie
1240 // happens or they get unloaded.
1241 if (state == zombie) {
1242 {
1243 // Flushing dependencies must be done before any possible
1244 // safepoint can sneak in, otherwise the oops used by the
1245 // dependency logic could have become stale.
1246 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1247 if (nmethod_needs_unregister) {
1248 Universe::heap()->unregister_nmethod(this);
1249 }
1250 flush_dependencies(NULL);
1251 }
1252
1253 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1254 // event and it hasn't already been reported for this nmethod then
1255 // report it now. The event may have been reported earlier if the GC
1256 // marked it for unloading). JvmtiDeferredEventQueue support means
1257 // we no longer go to a safepoint here.
1258 post_compiled_method_unload();
1259
1260 #ifdef ASSERT
1261 // It's no longer safe to access the oops section since zombie
1262 // nmethods aren't scanned for GC.
1263 _oops_are_stale = true;
1264 #endif
1265 // the Method may be reclaimed by class unloading now that the
1266 // nmethod is in zombie state
1267 set_method(NULL);
1268 } else {
1269 assert(state == not_entrant, "other cases may need to be handled differently");
1270 }
1271
1272 if (TraceCreateZombies) {
1273 ResourceMark m;
1274 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");
1275 }
1276
1277 NMethodSweeper::report_state_change(this);
1278 return true;
1279 }
1280
1281 void nmethod::flush() {
1282 // Note that there are no valid oops in the nmethod anymore.
1283 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1284 "osr nmethod must be unloaded or zombie before flushing");
1285 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1286 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1287 assert_locked_or_safepoint(CodeCache_lock);
1288
1289 // completely deallocate this method
1290 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1291 if (PrintMethodFlushing) {
1292 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1293 "/Free CodeCache:" SIZE_FORMAT "Kb",
1294 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1295 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1296 }
1297
1298 // We need to deallocate any ExceptionCache data.
1299 // Note that we do not need to grab the nmethod lock for this, it
1300 // better be thread safe if we're disposing of it!
1301 ExceptionCache* ec = exception_cache();
1302 set_exception_cache(NULL);
1303 while(ec != NULL) {
1304 ExceptionCache* next = ec->next();
1305 delete ec;
1306 ec = next;
1307 }
1308
1309 if (on_scavenge_root_list()) {
1310 CodeCache::drop_scavenge_root_nmethod(this);
1311 }
1312
1313 #if INCLUDE_JVMCI
1314 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1315 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1316 #endif
1317
1318 CodeBlob::flush();
1319 CodeCache::free(this);
1320 }
1321
1322 //
1323 // Notify all classes this nmethod is dependent on that it is no
1324 // longer dependent. This should only be called in two situations.
1325 // First, when a nmethod transitions to a zombie all dependents need
1326 // to be clear. Since zombification happens at a safepoint there's no
1327 // synchronization issues. The second place is a little more tricky.
1328 // During phase 1 of mark sweep class unloading may happen and as a
1329 // result some nmethods may get unloaded. In this case the flushing
1330 // of dependencies must happen during phase 1 since after GC any
1331 // dependencies in the unloaded nmethod won't be updated, so
1332 // traversing the dependency information in unsafe. In that case this
1333 // function is called with a non-NULL argument and this function only
1334 // notifies instanceKlasses that are reachable
1335
1336 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1337 assert_locked_or_safepoint(CodeCache_lock);
1338 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1339 "is_alive is non-NULL if and only if we are called during GC");
1340 if (!has_flushed_dependencies()) {
1341 set_has_flushed_dependencies();
1342 for (Dependencies::DepStream deps(this); deps.next(); ) {
1343 if (deps.type() == Dependencies::call_site_target_value) {
1344 // CallSite dependencies are managed on per-CallSite instance basis.
1345 oop call_site = deps.argument_oop(0);
1346 MethodHandles::remove_dependent_nmethod(call_site, this);
1347 } else {
1348 Klass* klass = deps.context_type();
1349 if (klass == NULL) {
1350 continue; // ignore things like evol_method
1351 }
1352 // During GC the is_alive closure is non-NULL, and is used to
1353 // determine liveness of dependees that need to be updated.
1354 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1355 // The GC defers deletion of this entry, since there might be multiple threads
1356 // iterating over the _dependencies graph. Other call paths are single-threaded
1357 // and may delete it immediately.
1358 bool delete_immediately = is_alive == NULL;
1359 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1360 }
1361 }
1362 }
1363 }
1364 }
1365
1366
1367 // If this oop is not live, the nmethod can be unloaded.
1368 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1369 assert(root != NULL, "just checking");
1370 oop obj = *root;
1371 if (obj == NULL || is_alive->do_object_b(obj)) {
1372 return false;
1373 }
1374
1375 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1376 // simply because one of its constant oops has gone dead.
1377 // No actual classes need to be unloaded in order for this to occur.
1378 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1379 make_unloaded(is_alive, obj);
1380 return true;
1381 }
1382
1383 // ------------------------------------------------------------------
1384 // post_compiled_method_load_event
1385 // new method for install_code() path
1386 // Transfer information from compilation to jvmti
1387 void nmethod::post_compiled_method_load_event() {
1388
1389 Method* moop = method();
1390 HOTSPOT_COMPILED_METHOD_LOAD(
1391 (char *) moop->klass_name()->bytes(),
1392 moop->klass_name()->utf8_length(),
1393 (char *) moop->name()->bytes(),
1394 moop->name()->utf8_length(),
1395 (char *) moop->signature()->bytes(),
1396 moop->signature()->utf8_length(),
1397 insts_begin(), insts_size());
1398
1399 if (JvmtiExport::should_post_compiled_method_load() ||
1400 JvmtiExport::should_post_compiled_method_unload()) {
1401 get_and_cache_jmethod_id();
1402 }
1403
1404 if (JvmtiExport::should_post_compiled_method_load()) {
1405 // Let the Service thread (which is a real Java thread) post the event
1406 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1407 JvmtiDeferredEventQueue::enqueue(
1408 JvmtiDeferredEvent::compiled_method_load_event(this));
1409 }
1410 }
1411
1412 jmethodID nmethod::get_and_cache_jmethod_id() {
1413 if (_jmethod_id == NULL) {
1414 // Cache the jmethod_id since it can no longer be looked up once the
1415 // method itself has been marked for unloading.
1416 _jmethod_id = method()->jmethod_id();
1417 }
1418 return _jmethod_id;
1419 }
1420
1421 void nmethod::post_compiled_method_unload() {
1422 if (unload_reported()) {
1423 // During unloading we transition to unloaded and then to zombie
1424 // and the unloading is reported during the first transition.
1425 return;
1426 }
1427
1428 assert(_method != NULL && !is_unloaded(), "just checking");
1429 DTRACE_METHOD_UNLOAD_PROBE(method());
1430
1431 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1432 // post the event. Sometime later this nmethod will be made a zombie
1433 // by the sweeper but the Method* will not be valid at that point.
1434 // If the _jmethod_id is null then no load event was ever requested
1435 // so don't bother posting the unload. The main reason for this is
1436 // that the jmethodID is a weak reference to the Method* so if
1437 // it's being unloaded there's no way to look it up since the weak
1438 // ref will have been cleared.
1439 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1440 assert(!unload_reported(), "already unloaded");
1441 JvmtiDeferredEvent event =
1442 JvmtiDeferredEvent::compiled_method_unload_event(this,
1443 _jmethod_id, insts_begin());
1444 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1445 JvmtiDeferredEventQueue::enqueue(event);
1446 }
1447
1448 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1449 // any time. As the nmethod is being unloaded now we mark it has
1450 // having the unload event reported - this will ensure that we don't
1451 // attempt to report the event in the unlikely scenario where the
1452 // event is enabled at the time the nmethod is made a zombie.
1453 set_unload_reported();
1454 }
1455
1456 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1457 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1458
1459 oop_Relocation* r = iter_at_oop->oop_reloc();
1460 // Traverse those oops directly embedded in the code.
1461 // Other oops (oop_index>0) are seen as part of scopes_oops.
1462 assert(1 == (r->oop_is_immediate()) +
1463 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1464 "oop must be found in exactly one place");
1465 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1466 // Unload this nmethod if the oop is dead.
1467 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1468 return true;;
1469 }
1470 }
1471
1472 return false;
1473 }
1474
1475 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1476 // Scopes
1477 for (oop* p = oops_begin(); p < oops_end(); p++) {
1478 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1479 if (can_unload(is_alive, p, unloading_occurred)) {
1480 return true;
1481 }
1482 }
1483 return false;
1484 }
1485
1486 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1487 // Compiled code
1488
1489 // Prevent extra code cache walk for platforms that don't have immediate oops.
1490 if (relocInfo::mustIterateImmediateOopsInCode()) {
1491 RelocIterator iter(this, low_boundary);
1492 while (iter.next()) {
1493 if (iter.type() == relocInfo::oop_type) {
1494 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1495 return true;
1496 }
1497 }
1498 }
1499 }
1500
1501 return do_unloading_scopes(is_alive, unloading_occurred);
1502 }
1503
1504 #if INCLUDE_JVMCI
1505 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1506 if (_jvmci_installed_code != NULL) {
1507 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1508 if (_jvmci_installed_code_triggers_unloading) {
1509 // jweak reference processing has already cleared the referent
1510 make_unloaded(is_alive, NULL);
1511 return true;
1512 } else {
1513 clear_jvmci_installed_code();
1514 }
1515 }
1516 }
1517 return false;
1518 }
1519 #endif
1520
1521 // Iterate over metadata calling this function. Used by RedefineClasses
1522 void nmethod::metadata_do(void f(Metadata*)) {
1523 address low_boundary = verified_entry_point();
1524 if (is_not_entrant()) {
1525 low_boundary += NativeJump::instruction_size;
1526 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1527 // (See comment above.)
1528 }
1529 {
1530 // Visit all immediate references that are embedded in the instruction stream.
1531 RelocIterator iter(this, low_boundary);
1532 while (iter.next()) {
1533 if (iter.type() == relocInfo::metadata_type ) {
1534 metadata_Relocation* r = iter.metadata_reloc();
1535 // In this metadata, we must only follow those metadatas directly embedded in
1536 // the code. Other metadatas (oop_index>0) are seen as part of
1537 // the metadata section below.
1538 assert(1 == (r->metadata_is_immediate()) +
1539 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1540 "metadata must be found in exactly one place");
1541 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1542 Metadata* md = r->metadata_value();
1543 if (md != _method) f(md);
1544 }
1545 } else if (iter.type() == relocInfo::virtual_call_type) {
1546 // Check compiledIC holders associated with this nmethod
1547 CompiledIC *ic = CompiledIC_at(&iter);
1548 if (ic->is_icholder_call()) {
1549 CompiledICHolder* cichk = ic->cached_icholder();
1550 f(cichk->holder_method());
1551 f(cichk->holder_klass());
1552 } else {
1553 Metadata* ic_oop = ic->cached_metadata();
1554 if (ic_oop != NULL) {
1555 f(ic_oop);
1556 }
1557 }
1558 }
1559 }
1560 }
1561
1562 // Visit the metadata section
1563 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1564 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1565 Metadata* md = *p;
1566 f(md);
1567 }
1568
1569 // Visit metadata not embedded in the other places.
1570 if (_method != NULL) f(_method);
1571 }
1572
1573 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1574 // make sure the oops ready to receive visitors
1575 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1576 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1577
1578 // If the method is not entrant or zombie then a JMP is plastered over the
1579 // first few bytes. If an oop in the old code was there, that oop
1580 // should not get GC'd. Skip the first few bytes of oops on
1581 // not-entrant methods.
1582 address low_boundary = verified_entry_point();
1583 if (is_not_entrant()) {
1584 low_boundary += NativeJump::instruction_size;
1585 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1586 // (See comment above.)
1587 }
1588
1589 // Prevent extra code cache walk for platforms that don't have immediate oops.
1590 if (relocInfo::mustIterateImmediateOopsInCode()) {
1591 RelocIterator iter(this, low_boundary);
1592
1593 while (iter.next()) {
1594 if (iter.type() == relocInfo::oop_type ) {
1595 oop_Relocation* r = iter.oop_reloc();
1596 // In this loop, we must only follow those oops directly embedded in
1597 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1598 assert(1 == (r->oop_is_immediate()) +
1599 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1600 "oop must be found in exactly one place");
1601 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1602 f->do_oop(r->oop_addr());
1603 }
1604 }
1605 }
1606 }
1607
1608 // Scopes
1609 // This includes oop constants not inlined in the code stream.
1610 for (oop* p = oops_begin(); p < oops_end(); p++) {
1611 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1612 f->do_oop(p);
1613 }
1614 }
1615
1616 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1617
1618 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1619
1620 // An nmethod is "marked" if its _mark_link is set non-null.
1621 // Even if it is the end of the linked list, it will have a non-null link value,
1622 // as long as it is on the list.
1623 // This code must be MP safe, because it is used from parallel GC passes.
1624 bool nmethod::test_set_oops_do_mark() {
1625 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1626 if (_oops_do_mark_link == NULL) {
1627 // Claim this nmethod for this thread to mark.
1628 if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) {
1629 // Atomically append this nmethod (now claimed) to the head of the list:
1630 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1631 for (;;) {
1632 nmethod* required_mark_nmethods = observed_mark_nmethods;
1633 _oops_do_mark_link = required_mark_nmethods;
1634 observed_mark_nmethods =
1635 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1636 if (observed_mark_nmethods == required_mark_nmethods)
1637 break;
1638 }
1639 // Mark was clear when we first saw this guy.
1640 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1641 return false;
1642 }
1643 }
1644 // On fall through, another racing thread marked this nmethod before we did.
1645 return true;
1646 }
1647
1648 void nmethod::oops_do_marking_prologue() {
1649 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1650 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1651 // We use cmpxchg instead of regular assignment here because the user
1652 // may fork a bunch of threads, and we need them all to see the same state.
1653 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1654 guarantee(observed == NULL, "no races in this sequential code");
1655 }
1656
1657 void nmethod::oops_do_marking_epilogue() {
1658 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1659 nmethod* cur = _oops_do_mark_nmethods;
1660 while (cur != NMETHOD_SENTINEL) {
1661 assert(cur != NULL, "not NULL-terminated");
1662 nmethod* next = cur->_oops_do_mark_link;
1663 cur->_oops_do_mark_link = NULL;
1664 DEBUG_ONLY(cur->verify_oop_relocations());
1665 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1666 cur = next;
1667 }
1668 nmethod* required = _oops_do_mark_nmethods;
1669 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1670 guarantee(observed == required, "no races in this sequential code");
1671 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1672 }
1673
1674 class DetectScavengeRoot: public OopClosure {
1675 bool _detected_scavenge_root;
1676 public:
1677 DetectScavengeRoot() : _detected_scavenge_root(false)
1678 { NOT_PRODUCT(_print_nm = NULL); }
1679 bool detected_scavenge_root() { return _detected_scavenge_root; }
1680 virtual void do_oop(oop* p) {
1681 if ((*p) != NULL && (*p)->is_scavengable()) {
1682 NOT_PRODUCT(maybe_print(p));
1683 _detected_scavenge_root = true;
1684 }
1685 }
1686 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1687
1688 #ifndef PRODUCT
1689 nmethod* _print_nm;
1690 void maybe_print(oop* p) {
1691 if (_print_nm == NULL) return;
1692 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1693 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1694 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1695 p2i(*p), p2i(p));
1696 (*p)->print();
1697 }
1698 #endif //PRODUCT
1699 };
1700
1701 bool nmethod::detect_scavenge_root_oops() {
1702 DetectScavengeRoot detect_scavenge_root;
1703 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1704 oops_do(&detect_scavenge_root);
1705 return detect_scavenge_root.detected_scavenge_root();
1706 }
1707
1708 inline bool includes(void* p, void* from, void* to) {
1709 return from <= p && p < to;
1710 }
1711
1712
1713 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1714 assert(count >= 2, "must be sentinel values, at least");
1715
1716 #ifdef ASSERT
1717 // must be sorted and unique; we do a binary search in find_pc_desc()
1718 int prev_offset = pcs[0].pc_offset();
1719 assert(prev_offset == PcDesc::lower_offset_limit,
1720 "must start with a sentinel");
1721 for (int i = 1; i < count; i++) {
1722 int this_offset = pcs[i].pc_offset();
1723 assert(this_offset > prev_offset, "offsets must be sorted");
1724 prev_offset = this_offset;
1725 }
1726 assert(prev_offset == PcDesc::upper_offset_limit,
1727 "must end with a sentinel");
1728 #endif //ASSERT
1729
1730 // Search for MethodHandle invokes and tag the nmethod.
1731 for (int i = 0; i < count; i++) {
1732 if (pcs[i].is_method_handle_invoke()) {
1733 set_has_method_handle_invokes(true);
1734 break;
1735 }
1736 }
1737 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1738
1739 int size = count * sizeof(PcDesc);
1740 assert(scopes_pcs_size() >= size, "oob");
1741 memcpy(scopes_pcs_begin(), pcs, size);
1742
1743 // Adjust the final sentinel downward.
1744 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1745 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1746 last_pc->set_pc_offset(content_size() + 1);
1747 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1748 // Fill any rounding gaps with copies of the last record.
1749 last_pc[1] = last_pc[0];
1750 }
1751 // The following assert could fail if sizeof(PcDesc) is not
1752 // an integral multiple of oopSize (the rounding term).
1753 // If it fails, change the logic to always allocate a multiple
1754 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1755 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1756 }
1757
1758 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1759 assert(scopes_data_size() >= size, "oob");
1760 memcpy(scopes_data_begin(), buffer, size);
1761 }
1762
1763 #ifdef ASSERT
1764 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1765 PcDesc* lower = search.scopes_pcs_begin();
1766 PcDesc* upper = search.scopes_pcs_end();
1767 lower += 1; // exclude initial sentinel
1768 PcDesc* res = NULL;
1769 for (PcDesc* p = lower; p < upper; p++) {
1770 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1771 if (match_desc(p, pc_offset, approximate)) {
1772 if (res == NULL)
1773 res = p;
1774 else
1775 res = (PcDesc*) badAddress;
1776 }
1777 }
1778 return res;
1779 }
1780 #endif
1781
1782
1783 // Finds a PcDesc with real-pc equal to "pc"
1784 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1785 address base_address = search.code_begin();
1786 if ((pc < base_address) ||
1787 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1788 return NULL; // PC is wildly out of range
1789 }
1790 int pc_offset = (int) (pc - base_address);
1791
1792 // Check the PcDesc cache if it contains the desired PcDesc
1793 // (This as an almost 100% hit rate.)
1794 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1795 if (res != NULL) {
1796 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1797 return res;
1798 }
1799
1800 // Fallback algorithm: quasi-linear search for the PcDesc
1801 // Find the last pc_offset less than the given offset.
1802 // The successor must be the required match, if there is a match at all.
1803 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1804 PcDesc* lower = search.scopes_pcs_begin();
1805 PcDesc* upper = search.scopes_pcs_end();
1806 upper -= 1; // exclude final sentinel
1807 if (lower >= upper) return NULL; // native method; no PcDescs at all
1808
1809 #define assert_LU_OK \
1810 /* invariant on lower..upper during the following search: */ \
1811 assert(lower->pc_offset() < pc_offset, "sanity"); \
1812 assert(upper->pc_offset() >= pc_offset, "sanity")
1813 assert_LU_OK;
1814
1815 // Use the last successful return as a split point.
1816 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1817 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1818 if (mid->pc_offset() < pc_offset) {
1819 lower = mid;
1820 } else {
1821 upper = mid;
1822 }
1823
1824 // Take giant steps at first (4096, then 256, then 16, then 1)
1825 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1826 const int RADIX = (1 << LOG2_RADIX);
1827 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1828 while ((mid = lower + step) < upper) {
1829 assert_LU_OK;
1830 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1831 if (mid->pc_offset() < pc_offset) {
1832 lower = mid;
1833 } else {
1834 upper = mid;
1835 break;
1836 }
1837 }
1838 assert_LU_OK;
1839 }
1840
1841 // Sneak up on the value with a linear search of length ~16.
1842 while (true) {
1843 assert_LU_OK;
1844 mid = lower + 1;
1845 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1846 if (mid->pc_offset() < pc_offset) {
1847 lower = mid;
1848 } else {
1849 upper = mid;
1850 break;
1851 }
1852 }
1853 #undef assert_LU_OK
1854
1855 if (match_desc(upper, pc_offset, approximate)) {
1856 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1857 _pc_desc_cache.add_pc_desc(upper);
1858 return upper;
1859 } else {
1860 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1861 return NULL;
1862 }
1863 }
1864
1865
1866 void nmethod::check_all_dependencies(DepChange& changes) {
1867 // Checked dependencies are allocated into this ResourceMark
1868 ResourceMark rm;
1869
1870 // Turn off dependency tracing while actually testing dependencies.
1871 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1872
1873 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1874 &DependencySignature::equals, 11027> DepTable;
1875
1876 DepTable* table = new DepTable();
1877
1878 // Iterate over live nmethods and check dependencies of all nmethods that are not
1879 // marked for deoptimization. A particular dependency is only checked once.
1880 NMethodIterator iter;
1881 while(iter.next()) {
1882 nmethod* nm = iter.method();
1883 // Only notify for live nmethods
1884 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1885 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1886 // Construct abstraction of a dependency.
1887 DependencySignature* current_sig = new DependencySignature(deps);
1888
1889 // Determine if dependency is already checked. table->put(...) returns
1890 // 'true' if the dependency is added (i.e., was not in the hashtable).
1891 if (table->put(*current_sig, 1)) {
1892 if (deps.check_dependency() != NULL) {
1893 // Dependency checking failed. Print out information about the failed
1894 // dependency and finally fail with an assert. We can fail here, since
1895 // dependency checking is never done in a product build.
1896 tty->print_cr("Failed dependency:");
1897 changes.print();
1898 nm->print();
1899 nm->print_dependencies();
1900 assert(false, "Should have been marked for deoptimization");
1901 }
1902 }
1903 }
1904 }
1905 }
1906 }
1907
1908 bool nmethod::check_dependency_on(DepChange& changes) {
1909 // What has happened:
1910 // 1) a new class dependee has been added
1911 // 2) dependee and all its super classes have been marked
1912 bool found_check = false; // set true if we are upset
1913 for (Dependencies::DepStream deps(this); deps.next(); ) {
1914 // Evaluate only relevant dependencies.
1915 if (deps.spot_check_dependency_at(changes) != NULL) {
1916 found_check = true;
1917 NOT_DEBUG(break);
1918 }
1919 }
1920 return found_check;
1921 }
1922
1923 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1924 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1925 Array<Method*>* dependee_methods = dependee_ik->methods();
1926 for (Dependencies::DepStream deps(this); deps.next(); ) {
1927 if (deps.type() == Dependencies::evol_method) {
1928 Method* method = deps.method_argument(0);
1929 for (int j = 0; j < dependee_methods->length(); j++) {
1930 if (dependee_methods->at(j) == method) {
1931 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1932 ResourceMark rm;
1933 log_debug(redefine, class, nmethod)
1934 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1935 _method->method_holder()->external_name(),
1936 _method->name()->as_C_string(),
1937 _method->signature()->as_C_string(),
1938 compile_id(),
1939 method->method_holder()->external_name(),
1940 method->name()->as_C_string(),
1941 method->signature()->as_C_string());
1942 }
1943 if (TraceDependencies || LogCompilation)
1944 deps.log_dependency(dependee);
1945 return true;
1946 }
1947 }
1948 }
1949 }
1950 return false;
1951 }
1952
1953 // Called from mark_for_deoptimization, when dependee is invalidated.
1954 bool nmethod::is_dependent_on_method(Method* dependee) {
1955 for (Dependencies::DepStream deps(this); deps.next(); ) {
1956 if (deps.type() != Dependencies::evol_method)
1957 continue;
1958 Method* method = deps.method_argument(0);
1959 if (method == dependee) return true;
1960 }
1961 return false;
1962 }
1963
1964
1965 bool nmethod::is_patchable_at(address instr_addr) {
1966 assert(insts_contains(instr_addr), "wrong nmethod used");
1967 if (is_zombie()) {
1968 // a zombie may never be patched
1969 return false;
1970 }
1971 return true;
1972 }
1973
1974
1975 address nmethod::continuation_for_implicit_exception(address pc) {
1976 // Exception happened outside inline-cache check code => we are inside
1977 // an active nmethod => use cpc to determine a return address
1978 int exception_offset = pc - code_begin();
1979 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1980 #ifdef ASSERT
1981 if (cont_offset == 0) {
1982 Thread* thread = Thread::current();
1983 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1984 HandleMark hm(thread);
1985 ResourceMark rm(thread);
1986 CodeBlob* cb = CodeCache::find_blob(pc);
1987 assert(cb != NULL && cb == this, "");
1988 ttyLocker ttyl;
1989 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
1990 print();
1991 method()->print_codes();
1992 print_code();
1993 print_pcs();
1994 }
1995 #endif
1996 if (cont_offset == 0) {
1997 // Let the normal error handling report the exception
1998 return NULL;
1999 }
2000 return code_begin() + cont_offset;
2001 }
2002
2003
2004
2005 void nmethod_init() {
2006 // make sure you didn't forget to adjust the filler fields
2007 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2008 }
2009
2010
2011 //-------------------------------------------------------------------------------------------
2012
2013
2014 // QQQ might we make this work from a frame??
2015 nmethodLocker::nmethodLocker(address pc) {
2016 CodeBlob* cb = CodeCache::find_blob(pc);
2017 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2018 _nm = cb->as_compiled_method();
2019 lock_nmethod(_nm);
2020 }
2021
2022 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2023 // should pass zombie_ok == true.
2024 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2025 if (cm == NULL) return;
2026 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2027 nmethod* nm = cm->as_nmethod();
2028 Atomic::inc(&nm->_lock_count);
2029 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2030 }
2031
2032 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2033 if (cm == NULL) return;
2034 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2035 nmethod* nm = cm->as_nmethod();
2036 Atomic::dec(&nm->_lock_count);
2037 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2038 }
2039
2040
2041 // -----------------------------------------------------------------------------
2042 // Verification
2043
2044 class VerifyOopsClosure: public OopClosure {
2045 nmethod* _nm;
2046 bool _ok;
2047 public:
2048 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2049 bool ok() { return _ok; }
2050 virtual void do_oop(oop* p) {
2051 if (oopDesc::is_oop_or_null(*p)) return;
2052 if (_ok) {
2053 _nm->print_nmethod(true);
2054 _ok = false;
2055 }
2056 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2057 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2058 }
2059 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2060 };
2061
2062 void nmethod::verify() {
2063
2064 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2065 // seems odd.
2066
2067 if (is_zombie() || is_not_entrant() || is_unloaded())
2068 return;
2069
2070 // Make sure all the entry points are correctly aligned for patching.
2071 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2072
2073 // assert(oopDesc::is_oop(method()), "must be valid");
2074
2075 ResourceMark rm;
2076
2077 if (!CodeCache::contains(this)) {
2078 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2079 }
2080
2081 if(is_native_method() )
2082 return;
2083
2084 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2085 if (nm != this) {
2086 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2087 }
2088
2089 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2090 if (! p->verify(this)) {
2091 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2092 }
2093 }
2094
2095 VerifyOopsClosure voc(this);
2096 oops_do(&voc);
2097 assert(voc.ok(), "embedded oops must be OK");
2098 Universe::heap()->verify_nmethod(this);
2099
2100 verify_scopes();
2101 }
2102
2103
2104 void nmethod::verify_interrupt_point(address call_site) {
2105 // Verify IC only when nmethod installation is finished.
2106 if (!is_not_installed()) {
2107 Thread *cur = Thread::current();
2108 if (CompiledIC_lock->owner() == cur ||
2109 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2110 SafepointSynchronize::is_at_safepoint())) {
2111 CompiledIC_at(this, call_site);
2112 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2113 } else {
2114 MutexLocker ml_verify (CompiledIC_lock);
2115 CompiledIC_at(this, call_site);
2116 }
2117 }
2118
2119 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2120 assert(pd != NULL, "PcDesc must exist");
2121 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2122 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2123 pd->return_oop());
2124 !sd->is_top(); sd = sd->sender()) {
2125 sd->verify();
2126 }
2127 }
2128
2129 void nmethod::verify_scopes() {
2130 if( !method() ) return; // Runtime stubs have no scope
2131 if (method()->is_native()) return; // Ignore stub methods.
2132 // iterate through all interrupt point
2133 // and verify the debug information is valid.
2134 RelocIterator iter((nmethod*)this);
2135 while (iter.next()) {
2136 address stub = NULL;
2137 switch (iter.type()) {
2138 case relocInfo::virtual_call_type:
2139 verify_interrupt_point(iter.addr());
2140 break;
2141 case relocInfo::opt_virtual_call_type:
2142 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2143 verify_interrupt_point(iter.addr());
2144 break;
2145 case relocInfo::static_call_type:
2146 stub = iter.static_call_reloc()->static_stub(false);
2147 //verify_interrupt_point(iter.addr());
2148 break;
2149 case relocInfo::runtime_call_type:
2150 case relocInfo::runtime_call_w_cp_type: {
2151 address destination = iter.reloc()->value();
2152 // Right now there is no way to find out which entries support
2153 // an interrupt point. It would be nice if we had this
2154 // information in a table.
2155 break;
2156 }
2157 default:
2158 break;
2159 }
2160 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2161 }
2162 }
2163
2164
2165 // -----------------------------------------------------------------------------
2166 // Non-product code
2167 #ifndef PRODUCT
2168
2169 class DebugScavengeRoot: public OopClosure {
2170 nmethod* _nm;
2171 bool _ok;
2172 public:
2173 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2174 bool ok() { return _ok; }
2175 virtual void do_oop(oop* p) {
2176 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2177 if (_ok) {
2178 _nm->print_nmethod(true);
2179 _ok = false;
2180 }
2181 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2182 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2183 (*p)->print();
2184 }
2185 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2186 };
2187
2188 void nmethod::verify_scavenge_root_oops() {
2189 if (!on_scavenge_root_list()) {
2190 // Actually look inside, to verify the claim that it's clean.
2191 DebugScavengeRoot debug_scavenge_root(this);
2192 oops_do(&debug_scavenge_root);
2193 if (!debug_scavenge_root.ok())
2194 fatal("found an unadvertised bad scavengable oop in the code cache");
2195 }
2196 assert(scavenge_root_not_marked(), "");
2197 }
2198
2199 #endif // PRODUCT
2200
2201 // Printing operations
2202
2203 void nmethod::print() const {
2204 ResourceMark rm;
2205 ttyLocker ttyl; // keep the following output all in one block
2206
2207 tty->print("Compiled method ");
2208
2209 if (is_compiled_by_c1()) {
2210 tty->print("(c1) ");
2211 } else if (is_compiled_by_c2()) {
2212 tty->print("(c2) ");
2213 } else if (is_compiled_by_jvmci()) {
2214 tty->print("(JVMCI) ");
2215 } else {
2216 tty->print("(nm) ");
2217 }
2218
2219 print_on(tty, NULL);
2220
2221 if (WizardMode) {
2222 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2223 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2224 tty->print(" { ");
2225 tty->print_cr("%s ", state());
2226 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2227 tty->print_cr("}:");
2228 }
2229 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2230 p2i(this),
2231 p2i(this) + size(),
2232 size());
2233 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2234 p2i(relocation_begin()),
2235 p2i(relocation_end()),
2236 relocation_size());
2237 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2238 p2i(consts_begin()),
2239 p2i(consts_end()),
2240 consts_size());
2241 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2242 p2i(insts_begin()),
2243 p2i(insts_end()),
2244 insts_size());
2245 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2246 p2i(stub_begin()),
2247 p2i(stub_end()),
2248 stub_size());
2249 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2250 p2i(oops_begin()),
2251 p2i(oops_end()),
2252 oops_size());
2253 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2254 p2i(metadata_begin()),
2255 p2i(metadata_end()),
2256 metadata_size());
2257 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2258 p2i(scopes_data_begin()),
2259 p2i(scopes_data_end()),
2260 scopes_data_size());
2261 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2262 p2i(scopes_pcs_begin()),
2263 p2i(scopes_pcs_end()),
2264 scopes_pcs_size());
2265 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(dependencies_begin()),
2267 p2i(dependencies_end()),
2268 dependencies_size());
2269 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(handler_table_begin()),
2271 p2i(handler_table_end()),
2272 handler_table_size());
2273 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(nul_chk_table_begin()),
2275 p2i(nul_chk_table_end()),
2276 nul_chk_table_size());
2277 }
2278
2279 #ifndef PRODUCT
2280
2281 void nmethod::print_scopes() {
2282 // Find the first pc desc for all scopes in the code and print it.
2283 ResourceMark rm;
2284 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2285 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2286 continue;
2287
2288 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2289 while (sd != NULL) {
2290 sd->print_on(tty, p);
2291 sd = sd->sender();
2292 }
2293 }
2294 }
2295
2296 void nmethod::print_dependencies() {
2297 ResourceMark rm;
2298 ttyLocker ttyl; // keep the following output all in one block
2299 tty->print_cr("Dependencies:");
2300 for (Dependencies::DepStream deps(this); deps.next(); ) {
2301 deps.print_dependency();
2302 Klass* ctxk = deps.context_type();
2303 if (ctxk != NULL) {
2304 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2305 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2306 }
2307 }
2308 deps.log_dependency(); // put it into the xml log also
2309 }
2310 }
2311
2312
2313 void nmethod::print_relocations() {
2314 ResourceMark m; // in case methods get printed via the debugger
2315 tty->print_cr("relocations:");
2316 RelocIterator iter(this);
2317 iter.print();
2318 }
2319
2320
2321 void nmethod::print_pcs() {
2322 ResourceMark m; // in case methods get printed via debugger
2323 tty->print_cr("pc-bytecode offsets:");
2324 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2325 p->print(this);
2326 }
2327 }
2328
2329 void nmethod::print_recorded_oops() {
2330 tty->print_cr("Recorded oops:");
2331 for (int i = 0; i < oops_count(); i++) {
2332 oop o = oop_at(i);
2333 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2334 if (o == (oop)Universe::non_oop_word()) {
2335 tty->print("non-oop word");
2336 } else {
2337 o->print_value();
2338 }
2339 tty->cr();
2340 }
2341 }
2342
2343 void nmethod::print_recorded_metadata() {
2344 tty->print_cr("Recorded metadata:");
2345 for (int i = 0; i < metadata_count(); i++) {
2346 Metadata* m = metadata_at(i);
2347 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2348 if (m == (Metadata*)Universe::non_oop_word()) {
2349 tty->print("non-metadata word");
2350 } else {
2351 m->print_value_on_maybe_null(tty);
2352 }
2353 tty->cr();
2354 }
2355 }
2356
2357 #endif // PRODUCT
2358
2359 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2360 RelocIterator iter(this, begin, end);
2361 bool have_one = false;
2362 while (iter.next()) {
2363 have_one = true;
2364 switch (iter.type()) {
2365 case relocInfo::none: return "no_reloc";
2366 case relocInfo::oop_type: {
2367 stringStream st;
2368 oop_Relocation* r = iter.oop_reloc();
2369 oop obj = r->oop_value();
2370 st.print("oop(");
2371 if (obj == NULL) st.print("NULL");
2372 else obj->print_value_on(&st);
2373 st.print(")");
2374 return st.as_string();
2375 }
2376 case relocInfo::metadata_type: {
2377 stringStream st;
2378 metadata_Relocation* r = iter.metadata_reloc();
2379 Metadata* obj = r->metadata_value();
2380 st.print("metadata(");
2381 if (obj == NULL) st.print("NULL");
2382 else obj->print_value_on(&st);
2383 st.print(")");
2384 return st.as_string();
2385 }
2386 case relocInfo::runtime_call_type:
2387 case relocInfo::runtime_call_w_cp_type: {
2388 stringStream st;
2389 st.print("runtime_call");
2390 CallRelocation* r = (CallRelocation*)iter.reloc();
2391 address dest = r->destination();
2392 CodeBlob* cb = CodeCache::find_blob(dest);
2393 if (cb != NULL) {
2394 st.print(" %s", cb->name());
2395 } else {
2396 ResourceMark rm;
2397 const int buflen = 1024;
2398 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2399 int offset;
2400 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2401 st.print(" %s", buf);
2402 if (offset != 0) {
2403 st.print("+%d", offset);
2404 }
2405 }
2406 }
2407 return st.as_string();
2408 }
2409 case relocInfo::virtual_call_type: {
2410 stringStream st;
2411 st.print_raw("virtual_call");
2412 virtual_call_Relocation* r = iter.virtual_call_reloc();
2413 Method* m = r->method_value();
2414 if (m != NULL) {
2415 assert(m->is_method(), "");
2416 m->print_short_name(&st);
2417 }
2418 return st.as_string();
2419 }
2420 case relocInfo::opt_virtual_call_type: {
2421 stringStream st;
2422 st.print_raw("optimized virtual_call");
2423 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2424 Method* m = r->method_value();
2425 if (m != NULL) {
2426 assert(m->is_method(), "");
2427 m->print_short_name(&st);
2428 }
2429 return st.as_string();
2430 }
2431 case relocInfo::static_call_type: {
2432 stringStream st;
2433 st.print_raw("static_call");
2434 static_call_Relocation* r = iter.static_call_reloc();
2435 Method* m = r->method_value();
2436 if (m != NULL) {
2437 assert(m->is_method(), "");
2438 m->print_short_name(&st);
2439 }
2440 return st.as_string();
2441 }
2442 case relocInfo::static_stub_type: return "static_stub";
2443 case relocInfo::external_word_type: return "external_word";
2444 case relocInfo::internal_word_type: return "internal_word";
2445 case relocInfo::section_word_type: return "section_word";
2446 case relocInfo::poll_type: return "poll";
2447 case relocInfo::poll_return_type: return "poll_return";
2448 case relocInfo::type_mask: return "type_bit_mask";
2449
2450 default:
2451 break;
2452 }
2453 }
2454 return have_one ? "other" : NULL;
2455 }
2456
2457 // Return a the last scope in (begin..end]
2458 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2459 PcDesc* p = pc_desc_near(begin+1);
2460 if (p != NULL && p->real_pc(this) <= end) {
2461 return new ScopeDesc(this, p->scope_decode_offset(),
2462 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2463 p->return_oop());
2464 }
2465 return NULL;
2466 }
2467
2468 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2469 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2470 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2471 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2472 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2473 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2474
2475 if (has_method_handle_invokes())
2476 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2477
2478 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2479
2480 if (block_begin == entry_point()) {
2481 methodHandle m = method();
2482 if (m.not_null()) {
2483 stream->print(" # ");
2484 m->print_value_on(stream);
2485 stream->cr();
2486 }
2487 if (m.not_null() && !is_osr_method()) {
2488 ResourceMark rm;
2489 int sizeargs = m->size_of_parameters();
2490 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2491 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2492 {
2493 int sig_index = 0;
2494 if (!m->is_static())
2495 sig_bt[sig_index++] = T_OBJECT; // 'this'
2496 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2497 BasicType t = ss.type();
2498 sig_bt[sig_index++] = t;
2499 if (type2size[t] == 2) {
2500 sig_bt[sig_index++] = T_VOID;
2501 } else {
2502 assert(type2size[t] == 1, "size is 1 or 2");
2503 }
2504 }
2505 assert(sig_index == sizeargs, "");
2506 }
2507 const char* spname = "sp"; // make arch-specific?
2508 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2509 int stack_slot_offset = this->frame_size() * wordSize;
2510 int tab1 = 14, tab2 = 24;
2511 int sig_index = 0;
2512 int arg_index = (m->is_static() ? 0 : -1);
2513 bool did_old_sp = false;
2514 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2515 bool at_this = (arg_index == -1);
2516 bool at_old_sp = false;
2517 BasicType t = (at_this ? T_OBJECT : ss.type());
2518 assert(t == sig_bt[sig_index], "sigs in sync");
2519 if (at_this)
2520 stream->print(" # this: ");
2521 else
2522 stream->print(" # parm%d: ", arg_index);
2523 stream->move_to(tab1);
2524 VMReg fst = regs[sig_index].first();
2525 VMReg snd = regs[sig_index].second();
2526 if (fst->is_reg()) {
2527 stream->print("%s", fst->name());
2528 if (snd->is_valid()) {
2529 stream->print(":%s", snd->name());
2530 }
2531 } else if (fst->is_stack()) {
2532 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2533 if (offset == stack_slot_offset) at_old_sp = true;
2534 stream->print("[%s+0x%x]", spname, offset);
2535 } else {
2536 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2537 }
2538 stream->print(" ");
2539 stream->move_to(tab2);
2540 stream->print("= ");
2541 if (at_this) {
2542 m->method_holder()->print_value_on(stream);
2543 } else {
2544 bool did_name = false;
2545 if (!at_this && ss.is_object()) {
2546 Symbol* name = ss.as_symbol_or_null();
2547 if (name != NULL) {
2548 name->print_value_on(stream);
2549 did_name = true;
2550 }
2551 }
2552 if (!did_name)
2553 stream->print("%s", type2name(t));
2554 }
2555 if (at_old_sp) {
2556 stream->print(" (%s of caller)", spname);
2557 did_old_sp = true;
2558 }
2559 stream->cr();
2560 sig_index += type2size[t];
2561 arg_index += 1;
2562 if (!at_this) ss.next();
2563 }
2564 if (!did_old_sp) {
2565 stream->print(" # ");
2566 stream->move_to(tab1);
2567 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2568 stream->print(" (%s of caller)", spname);
2569 stream->cr();
2570 }
2571 }
2572 }
2573 }
2574
2575 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2576 // First, find an oopmap in (begin, end].
2577 // We use the odd half-closed interval so that oop maps and scope descs
2578 // which are tied to the byte after a call are printed with the call itself.
2579 address base = code_begin();
2580 ImmutableOopMapSet* oms = oop_maps();
2581 if (oms != NULL) {
2582 for (int i = 0, imax = oms->count(); i < imax; i++) {
2583 const ImmutableOopMapPair* pair = oms->pair_at(i);
2584 const ImmutableOopMap* om = pair->get_from(oms);
2585 address pc = base + pair->pc_offset();
2586 if (pc > begin) {
2587 if (pc <= end) {
2588 st->move_to(column);
2589 st->print("; ");
2590 om->print_on(st);
2591 }
2592 break;
2593 }
2594 }
2595 }
2596
2597 // Print any debug info present at this pc.
2598 ScopeDesc* sd = scope_desc_in(begin, end);
2599 if (sd != NULL) {
2600 st->move_to(column);
2601 if (sd->bci() == SynchronizationEntryBCI) {
2602 st->print(";*synchronization entry");
2603 } else {
2604 if (sd->method() == NULL) {
2605 st->print("method is NULL");
2606 } else if (sd->method()->is_native()) {
2607 st->print("method is native");
2608 } else {
2609 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2610 st->print(";*%s", Bytecodes::name(bc));
2611 switch (bc) {
2612 case Bytecodes::_invokevirtual:
2613 case Bytecodes::_invokespecial:
2614 case Bytecodes::_invokestatic:
2615 case Bytecodes::_invokeinterface:
2616 {
2617 Bytecode_invoke invoke(sd->method(), sd->bci());
2618 st->print(" ");
2619 if (invoke.name() != NULL)
2620 invoke.name()->print_symbol_on(st);
2621 else
2622 st->print("<UNKNOWN>");
2623 break;
2624 }
2625 case Bytecodes::_getfield:
2626 case Bytecodes::_putfield:
2627 case Bytecodes::_getstatic:
2628 case Bytecodes::_putstatic:
2629 {
2630 Bytecode_field field(sd->method(), sd->bci());
2631 st->print(" ");
2632 if (field.name() != NULL)
2633 field.name()->print_symbol_on(st);
2634 else
2635 st->print("<UNKNOWN>");
2636 }
2637 default:
2638 break;
2639 }
2640 }
2641 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2642 }
2643
2644 // Print all scopes
2645 for (;sd != NULL; sd = sd->sender()) {
2646 st->move_to(column);
2647 st->print("; -");
2648 if (sd->method() == NULL) {
2649 st->print("method is NULL");
2650 } else {
2651 sd->method()->print_short_name(st);
2652 }
2653 int lineno = sd->method()->line_number_from_bci(sd->bci());
2654 if (lineno != -1) {
2655 st->print("@%d (line %d)", sd->bci(), lineno);
2656 } else {
2657 st->print("@%d", sd->bci());
2658 }
2659 st->cr();
2660 }
2661 }
2662
2663 // Print relocation information
2664 const char* str = reloc_string_for(begin, end);
2665 if (str != NULL) {
2666 if (sd != NULL) st->cr();
2667 st->move_to(column);
2668 st->print("; {%s}", str);
2669 }
2670 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2671 if (cont_offset != 0) {
2672 st->move_to(column);
2673 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2674 }
2675
2676 }
2677
2678 class DirectNativeCallWrapper: public NativeCallWrapper {
2679 private:
2680 NativeCall* _call;
2681
2682 public:
2683 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2684
2685 virtual address destination() const { return _call->destination(); }
2686 virtual address instruction_address() const { return _call->instruction_address(); }
2687 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2688 virtual address return_address() const { return _call->return_address(); }
2689
2690 virtual address get_resolve_call_stub(bool is_optimized) const {
2691 if (is_optimized) {
2692 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2693 }
2694 return SharedRuntime::get_resolve_virtual_call_stub();
2695 }
2696
2697 virtual void set_destination_mt_safe(address dest) {
2698 #if INCLUDE_AOT
2699 if (UseAOT) {
2700 CodeBlob* callee = CodeCache::find_blob(dest);
2701 CompiledMethod* cm = callee->as_compiled_method_or_null();
2702 if (cm != NULL && cm->is_far_code()) {
2703 // Temporary fix, see JDK-8143106
2704 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2705 csc->set_to_far(methodHandle(cm->method()), dest);
2706 return;
2707 }
2708 }
2709 #endif
2710 _call->set_destination_mt_safe(dest);
2711 }
2712
2713 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2714 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2715 #if INCLUDE_AOT
2716 if (info.to_aot()) {
2717 csc->set_to_far(method, info.entry());
2718 } else
2719 #endif
2720 {
2721 csc->set_to_interpreted(method, info.entry());
2722 }
2723 }
2724
2725 virtual void verify() const {
2726 // make sure code pattern is actually a call imm32 instruction
2727 _call->verify();
2728 if (os::is_MP()) {
2729 _call->verify_alignment();
2730 }
2731 }
2732
2733 virtual void verify_resolve_call(address dest) const {
2734 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2735 assert(!db->is_adapter_blob(), "must use stub!");
2736 }
2737
2738 virtual bool is_call_to_interpreted(address dest) const {
2739 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2740 return cb->contains(dest);
2741 }
2742
2743 virtual bool is_safe_for_patching() const { return false; }
2744
2745 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2746 return nativeMovConstReg_at(r->cached_value());
2747 }
2748
2749 virtual void *get_data(NativeInstruction* instruction) const {
2750 return (void*)((NativeMovConstReg*) instruction)->data();
2751 }
2752
2753 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2754 ((NativeMovConstReg*) instruction)->set_data(data);
2755 }
2756 };
2757
2758 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2759 return new DirectNativeCallWrapper((NativeCall*) call);
2760 }
2761
2762 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2763 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2764 }
2765
2766 address nmethod::call_instruction_address(address pc) const {
2767 if (NativeCall::is_call_before(pc)) {
2768 NativeCall *ncall = nativeCall_before(pc);
2769 return ncall->instruction_address();
2770 }
2771 return NULL;
2772 }
2773
2774 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2775 return CompiledDirectStaticCall::at(call_site);
2776 }
2777
2778 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2779 return CompiledDirectStaticCall::at(call_site);
2780 }
2781
2782 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2783 return CompiledDirectStaticCall::before(return_addr);
2784 }
2785
2786 #ifndef PRODUCT
2787
2788 void nmethod::print_value_on(outputStream* st) const {
2789 st->print("nmethod");
2790 print_on(st, NULL);
2791 }
2792
2793 void nmethod::print_calls(outputStream* st) {
2794 RelocIterator iter(this);
2795 while (iter.next()) {
2796 switch (iter.type()) {
2797 case relocInfo::virtual_call_type:
2798 case relocInfo::opt_virtual_call_type: {
2799 VerifyMutexLocker mc(CompiledIC_lock);
2800 CompiledIC_at(&iter)->print();
2801 break;
2802 }
2803 case relocInfo::static_call_type:
2804 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2805 CompiledDirectStaticCall::at(iter.reloc())->print();
2806 break;
2807 default:
2808 break;
2809 }
2810 }
2811 }
2812
2813 void nmethod::print_handler_table() {
2814 ExceptionHandlerTable(this).print();
2815 }
2816
2817 void nmethod::print_nul_chk_table() {
2818 ImplicitExceptionTable(this).print(code_begin());
2819 }
2820
2821 void nmethod::print_statistics() {
2822 ttyLocker ttyl;
2823 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2824 native_nmethod_stats.print_native_nmethod_stats();
2825 #ifdef COMPILER1
2826 c1_java_nmethod_stats.print_nmethod_stats("C1");
2827 #endif
2828 #ifdef COMPILER2
2829 c2_java_nmethod_stats.print_nmethod_stats("C2");
2830 #endif
2831 #if INCLUDE_JVMCI
2832 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2833 #endif
2834 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2835 DebugInformationRecorder::print_statistics();
2836 #ifndef PRODUCT
2837 pc_nmethod_stats.print_pc_stats();
2838 #endif
2839 Dependencies::print_statistics();
2840 if (xtty != NULL) xtty->tail("statistics");
2841 }
2842
2843 #endif // !PRODUCT
2844
2845 #if INCLUDE_JVMCI
2846 void nmethod::clear_jvmci_installed_code() {
2847 assert_locked_or_safepoint(Patching_lock);
2848 if (_jvmci_installed_code != NULL) {
2849 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2850 _jvmci_installed_code = NULL;
2851 }
2852 }
2853
2854 void nmethod::clear_speculation_log() {
2855 assert_locked_or_safepoint(Patching_lock);
2856 if (_speculation_log != NULL) {
2857 JNIHandles::destroy_weak_global(_speculation_log);
2858 _speculation_log = NULL;
2859 }
2860 }
2861
2862 void nmethod::maybe_invalidate_installed_code() {
2863 assert(Patching_lock->is_locked() ||
2864 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2865 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2866 if (installed_code != NULL) {
2867 // Update the values in the InstalledCode instance if it still refers to this nmethod
2868 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2869 if (nm == this) {
2870 if (!is_alive()) {
2871 // Break the link between nmethod and InstalledCode such that the nmethod
2872 // can subsequently be flushed safely. The link must be maintained while
2873 // the method could have live activations since invalidateInstalledCode
2874 // might want to invalidate all existing activations.
2875 InstalledCode::set_address(installed_code, 0);
2876 InstalledCode::set_entryPoint(installed_code, 0);
2877 } else if (is_not_entrant()) {
2878 // Remove the entry point so any invocation will fail but keep
2879 // the address link around that so that existing activations can
2880 // be invalidated.
2881 InstalledCode::set_entryPoint(installed_code, 0);
2882 }
2883 }
2884 }
2885 if (!is_alive()) {
2886 // Clear these out after the nmethod has been unregistered and any
2887 // updates to the InstalledCode instance have been performed.
2888 clear_jvmci_installed_code();
2889 clear_speculation_log();
2890 }
2891 }
2892
2893 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2894 if (installedCode() == NULL) {
2895 THROW(vmSymbols::java_lang_NullPointerException());
2896 }
2897 jlong nativeMethod = InstalledCode::address(installedCode);
2898 nmethod* nm = (nmethod*)nativeMethod;
2899 if (nm == NULL) {
2900 // Nothing to do
2901 return;
2902 }
2903
2904 nmethodLocker nml(nm);
2905 #ifdef ASSERT
2906 {
2907 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2908 // This relationship can only be checked safely under a lock
2909 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2910 }
2911 #endif
2912
2913 if (nm->is_alive()) {
2914 // Invalidating the InstalledCode means we want the nmethod
2915 // to be deoptimized.
2916 nm->mark_for_deoptimization();
2917 VM_Deoptimize op;
2918 VMThread::execute(&op);
2919 }
2920
2921 // Multiple threads could reach this point so we now need to
2922 // lock and re-check the link to the nmethod so that only one
2923 // thread clears it.
2924 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2925 if (InstalledCode::address(installedCode) == nativeMethod) {
2926 InstalledCode::set_address(installedCode, 0);
2927 }
2928 }
2929
2930 oop nmethod::jvmci_installed_code() {
2931 return JNIHandles::resolve(_jvmci_installed_code);
2932 }
2933
2934 oop nmethod::speculation_log() {
2935 return JNIHandles::resolve(_speculation_log);
2936 }
2937
2938 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2939 if (!this->is_compiled_by_jvmci()) {
2940 return NULL;
2941 }
2942 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2943 if (installed_code != NULL) {
2944 oop installed_code_name = NULL;
2945 if (installed_code->is_a(InstalledCode::klass())) {
2946 installed_code_name = InstalledCode::name(installed_code);
2947 }
2948 if (installed_code_name != NULL) {
2949 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2950 }
2951 }
2952 return NULL;
2953 }
2954 #endif