1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvmtiImpl.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/orderAccess.inline.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/sweeper.hpp"
51 #include "utilities/align.hpp"
52 #include "utilities/dtrace.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/resourceHash.hpp"
55 #include "utilities/xmlstream.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciJavaClasses.hpp"
58 #endif
59
60 #ifdef DTRACE_ENABLED
61
62 // Only bother with this argument setup if dtrace is available
63
64 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
65 { \
66 Method* m = (method); \
67 if (m != NULL) { \
68 Symbol* klass_name = m->klass_name(); \
69 Symbol* name = m->name(); \
70 Symbol* signature = m->signature(); \
71 HOTSPOT_COMPILED_METHOD_UNLOAD( \
72 (char *) klass_name->bytes(), klass_name->utf8_length(), \
73 (char *) name->bytes(), name->utf8_length(), \
74 (char *) signature->bytes(), signature->utf8_length()); \
75 } \
76 }
77
78 #else // ndef DTRACE_ENABLED
79
80 #define DTRACE_METHOD_UNLOAD_PROBE(method)
81
82 #endif
83
84 //---------------------------------------------------------------------------------
85 // NMethod statistics
86 // They are printed under various flags, including:
87 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
88 // (In the latter two cases, they like other stats are printed to the log only.)
89
90 #ifndef PRODUCT
91 // These variables are put into one block to reduce relocations
92 // and make it simpler to print from the debugger.
93 struct java_nmethod_stats_struct {
94 int nmethod_count;
95 int total_size;
96 int relocation_size;
97 int consts_size;
98 int insts_size;
99 int stub_size;
100 int scopes_data_size;
101 int scopes_pcs_size;
102 int dependencies_size;
103 int handler_table_size;
104 int nul_chk_table_size;
105 int oops_size;
106 int metadata_size;
107
108 void note_nmethod(nmethod* nm) {
109 nmethod_count += 1;
110 total_size += nm->size();
111 relocation_size += nm->relocation_size();
112 consts_size += nm->consts_size();
113 insts_size += nm->insts_size();
114 stub_size += nm->stub_size();
115 oops_size += nm->oops_size();
116 metadata_size += nm->metadata_size();
117 scopes_data_size += nm->scopes_data_size();
118 scopes_pcs_size += nm->scopes_pcs_size();
119 dependencies_size += nm->dependencies_size();
120 handler_table_size += nm->handler_table_size();
121 nul_chk_table_size += nm->nul_chk_table_size();
122 }
123 void print_nmethod_stats(const char* name) {
124 if (nmethod_count == 0) return;
125 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
126 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
127 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
128 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
129 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
130 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
131 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
132 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
133 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
134 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
135 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
136 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
137 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
138 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
139 }
140 };
141
142 struct native_nmethod_stats_struct {
143 int native_nmethod_count;
144 int native_total_size;
145 int native_relocation_size;
146 int native_insts_size;
147 int native_oops_size;
148 int native_metadata_size;
149 void note_native_nmethod(nmethod* nm) {
150 native_nmethod_count += 1;
151 native_total_size += nm->size();
152 native_relocation_size += nm->relocation_size();
153 native_insts_size += nm->insts_size();
154 native_oops_size += nm->oops_size();
155 native_metadata_size += nm->metadata_size();
156 }
157 void print_native_nmethod_stats() {
158 if (native_nmethod_count == 0) return;
159 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
160 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
161 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
162 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
163 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
164 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
165 }
166 };
167
168 struct pc_nmethod_stats_struct {
169 int pc_desc_resets; // number of resets (= number of caches)
170 int pc_desc_queries; // queries to nmethod::find_pc_desc
171 int pc_desc_approx; // number of those which have approximate true
172 int pc_desc_repeats; // number of _pc_descs[0] hits
173 int pc_desc_hits; // number of LRU cache hits
174 int pc_desc_tests; // total number of PcDesc examinations
175 int pc_desc_searches; // total number of quasi-binary search steps
176 int pc_desc_adds; // number of LUR cache insertions
177
178 void print_pc_stats() {
179 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
180 pc_desc_queries,
181 (double)(pc_desc_tests + pc_desc_searches)
182 / pc_desc_queries);
183 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
184 pc_desc_resets,
185 pc_desc_queries, pc_desc_approx,
186 pc_desc_repeats, pc_desc_hits,
187 pc_desc_tests, pc_desc_searches, pc_desc_adds);
188 }
189 };
190
191 #ifdef COMPILER1
192 static java_nmethod_stats_struct c1_java_nmethod_stats;
193 #endif
194 #ifdef COMPILER2
195 static java_nmethod_stats_struct c2_java_nmethod_stats;
196 #endif
197 #if INCLUDE_JVMCI
198 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
199 #endif
200 static java_nmethod_stats_struct unknown_java_nmethod_stats;
201
202 static native_nmethod_stats_struct native_nmethod_stats;
203 static pc_nmethod_stats_struct pc_nmethod_stats;
204
205 static void note_java_nmethod(nmethod* nm) {
206 #ifdef COMPILER1
207 if (nm->is_compiled_by_c1()) {
208 c1_java_nmethod_stats.note_nmethod(nm);
209 } else
210 #endif
211 #ifdef COMPILER2
212 if (nm->is_compiled_by_c2()) {
213 c2_java_nmethod_stats.note_nmethod(nm);
214 } else
215 #endif
216 #if INCLUDE_JVMCI
217 if (nm->is_compiled_by_jvmci()) {
218 jvmci_java_nmethod_stats.note_nmethod(nm);
219 } else
220 #endif
221 {
222 unknown_java_nmethod_stats.note_nmethod(nm);
223 }
224 }
225 #endif // !PRODUCT
226
227 //---------------------------------------------------------------------------------
228
229
230 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
231 assert(pc != NULL, "Must be non null");
232 assert(exception.not_null(), "Must be non null");
233 assert(handler != NULL, "Must be non null");
234
235 _count = 0;
236 _exception_type = exception->klass();
237 _next = NULL;
238
239 add_address_and_handler(pc,handler);
240 }
241
242
243 address ExceptionCache::match(Handle exception, address pc) {
244 assert(pc != NULL,"Must be non null");
245 assert(exception.not_null(),"Must be non null");
246 if (exception->klass() == exception_type()) {
247 return (test_address(pc));
248 }
249
250 return NULL;
251 }
252
253
254 bool ExceptionCache::match_exception_with_space(Handle exception) {
255 assert(exception.not_null(),"Must be non null");
256 if (exception->klass() == exception_type() && count() < cache_size) {
257 return true;
258 }
259 return false;
260 }
261
262
263 address ExceptionCache::test_address(address addr) {
264 int limit = count();
265 for (int i = 0; i < limit; i++) {
266 if (pc_at(i) == addr) {
267 return handler_at(i);
268 }
269 }
270 return NULL;
271 }
272
273
274 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
275 if (test_address(addr) == handler) return true;
276
277 int index = count();
278 if (index < cache_size) {
279 set_pc_at(index, addr);
280 set_handler_at(index, handler);
281 increment_count();
282 return true;
283 }
284 return false;
285 }
286
287 //-----------------------------------------------------------------------------
288
289
290 // Helper used by both find_pc_desc methods.
291 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
292 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
293 if (!approximate)
294 return pc->pc_offset() == pc_offset;
295 else
296 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
297 }
298
299 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
300 if (initial_pc_desc == NULL) {
301 _pc_descs[0] = NULL; // native method; no PcDescs at all
302 return;
303 }
304 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
305 // reset the cache by filling it with benign (non-null) values
306 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
307 for (int i = 0; i < cache_size; i++)
308 _pc_descs[i] = initial_pc_desc;
309 }
310
311 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
313 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
314
315 // Note: one might think that caching the most recently
316 // read value separately would be a win, but one would be
317 // wrong. When many threads are updating it, the cache
318 // line it's in would bounce between caches, negating
319 // any benefit.
320
321 // In order to prevent race conditions do not load cache elements
322 // repeatedly, but use a local copy:
323 PcDesc* res;
324
325 // Step one: Check the most recently added value.
326 res = _pc_descs[0];
327 if (res == NULL) return NULL; // native method; no PcDescs at all
328 if (match_desc(res, pc_offset, approximate)) {
329 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
330 return res;
331 }
332
333 // Step two: Check the rest of the LRU cache.
334 for (int i = 1; i < cache_size; ++i) {
335 res = _pc_descs[i];
336 if (res->pc_offset() < 0) break; // optimization: skip empty cache
337 if (match_desc(res, pc_offset, approximate)) {
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
339 return res;
340 }
341 }
342
343 // Report failure.
344 return NULL;
345 }
346
347 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
349 // Update the LRU cache by shifting pc_desc forward.
350 for (int i = 0; i < cache_size; i++) {
351 PcDesc* next = _pc_descs[i];
352 _pc_descs[i] = pc_desc;
353 pc_desc = next;
354 }
355 }
356
357 // adjust pcs_size so that it is a multiple of both oopSize and
358 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
359 // of oopSize, then 2*sizeof(PcDesc) is)
360 static int adjust_pcs_size(int pcs_size) {
361 int nsize = align_up(pcs_size, oopSize);
362 if ((nsize % sizeof(PcDesc)) != 0) {
363 nsize = pcs_size + sizeof(PcDesc);
364 }
365 assert((nsize % oopSize) == 0, "correct alignment");
366 return nsize;
367 }
368
369
370 int nmethod::total_size() const {
371 return
372 consts_size() +
373 insts_size() +
374 stub_size() +
375 scopes_data_size() +
376 scopes_pcs_size() +
377 handler_table_size() +
378 nul_chk_table_size();
379 }
380
381 const char* nmethod::compile_kind() const {
382 if (is_osr_method()) return "osr";
383 if (method() != NULL && is_native_method()) return "c2n";
384 return NULL;
385 }
386
387 // Fill in default values for various flag fields
388 void nmethod::init_defaults() {
389 _state = in_use;
390 _has_flushed_dependencies = 0;
391 _lock_count = 0;
392 _stack_traversal_mark = 0;
393 _unload_reported = false; // jvmti state
394 _is_far_code = false; // nmethods are located in CodeCache
395
396 #ifdef ASSERT
397 _oops_are_stale = false;
398 #endif
399
400 _oops_do_mark_link = NULL;
401 _jmethod_id = NULL;
402 _osr_link = NULL;
403 _unloading_next = NULL;
404 _scavenge_root_link = NULL;
405 _scavenge_root_state = 0;
406 #if INCLUDE_RTM_OPT
407 _rtm_state = NoRTM;
408 #endif
409 #if INCLUDE_JVMCI
410 _jvmci_installed_code = NULL;
411 _speculation_log = NULL;
412 _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 // verify nmethod
442 debug_only(if (nm) nm->verify();) // might block
443
444 if (nm != NULL) {
445 nm->log_new_nmethod();
446 }
447
448 return nm;
449 }
450
451 nmethod* nmethod::new_nmethod(const methodHandle& method,
452 int compile_id,
453 int entry_bci,
454 CodeOffsets* offsets,
455 int orig_pc_offset,
456 DebugInformationRecorder* debug_info,
457 Dependencies* dependencies,
458 CodeBuffer* code_buffer, int frame_size,
459 OopMapSet* oop_maps,
460 ExceptionHandlerTable* handler_table,
461 ImplicitExceptionTable* nul_chk_table,
462 AbstractCompiler* compiler,
463 int comp_level
464 #if INCLUDE_JVMCI
465 , jweak installed_code,
466 jweak speculationLog
467 #endif
468 )
469 {
470 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
471 code_buffer->finalize_oop_references(method);
472 // create nmethod
473 nmethod* nm = NULL;
474 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
475 int nmethod_size =
476 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
477 + adjust_pcs_size(debug_info->pcs_size())
478 + align_up((int)dependencies->size_in_bytes(), oopSize)
479 + align_up(handler_table->size_in_bytes() , oopSize)
480 + align_up(nul_chk_table->size_in_bytes() , oopSize)
481 + align_up(debug_info->data_size() , oopSize);
482
483 nm = new (nmethod_size, comp_level)
484 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
485 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
486 oop_maps,
487 handler_table,
488 nul_chk_table,
489 compiler,
490 comp_level
491 #if INCLUDE_JVMCI
492 , installed_code,
493 speculationLog
494 #endif
495 );
496
497 if (nm != NULL) {
498 // To make dependency checking during class loading fast, record
499 // the nmethod dependencies in the classes it is dependent on.
500 // This allows the dependency checking code to simply walk the
501 // class hierarchy above the loaded class, checking only nmethods
502 // which are dependent on those classes. The slow way is to
503 // check every nmethod for dependencies which makes it linear in
504 // the number of methods compiled. For applications with a lot
505 // classes the slow way is too slow.
506 for (Dependencies::DepStream deps(nm); deps.next(); ) {
507 if (deps.type() == Dependencies::call_site_target_value) {
508 // CallSite dependencies are managed on per-CallSite instance basis.
509 oop call_site = deps.argument_oop(0);
510 MethodHandles::add_dependent_nmethod(call_site, nm);
511 } else {
512 Klass* klass = deps.context_type();
513 if (klass == NULL) {
514 continue; // ignore things like evol_method
515 }
516 // record this nmethod as dependent on this klass
517 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
518 }
519 }
520 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
521 }
522 }
523 // Do verification and logging outside CodeCache_lock.
524 if (nm != NULL) {
525 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
526 DEBUG_ONLY(nm->verify();)
527 nm->log_new_nmethod();
528 }
529 return nm;
530 }
531
532 // For native wrappers
533 nmethod::nmethod(
534 Method* method,
535 CompilerType type,
536 int nmethod_size,
537 int compile_id,
538 CodeOffsets* offsets,
539 CodeBuffer* code_buffer,
540 int frame_size,
541 ByteSize basic_lock_owner_sp_offset,
542 ByteSize basic_lock_sp_offset,
543 OopMapSet* oop_maps )
544 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
545 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
546 _native_basic_lock_sp_offset(basic_lock_sp_offset)
547 {
548 {
549 int scopes_data_offset = 0;
550 int deoptimize_offset = 0;
551 int deoptimize_mh_offset = 0;
552
553 debug_only(NoSafepointVerifier nsv;)
554 assert_locked_or_safepoint(CodeCache_lock);
555
556 init_defaults();
557 _entry_bci = InvocationEntryBci;
558 // We have no exception handler or deopt handler make the
559 // values something that will never match a pc like the nmethod vtable entry
560 _exception_offset = 0;
561 _orig_pc_offset = 0;
562
563 _consts_offset = data_offset();
564 _stub_offset = data_offset();
565 _oops_offset = data_offset();
566 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
567 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
568 _scopes_pcs_offset = scopes_data_offset;
569 _dependencies_offset = _scopes_pcs_offset;
570 _handler_table_offset = _dependencies_offset;
571 _nul_chk_table_offset = _handler_table_offset;
572 _nmethod_end_offset = _nul_chk_table_offset;
573 _compile_id = compile_id;
574 _comp_level = CompLevel_none;
575 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
576 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
577 _osr_entry_point = NULL;
578 _exception_cache = NULL;
579 _pc_desc_container.reset_to(NULL);
580 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
581
582 _scopes_data_begin = (address) this + scopes_data_offset;
583 _deopt_handler_begin = (address) this + deoptimize_offset;
584 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
585
586 code_buffer->copy_code_and_locs_to(this);
587 code_buffer->copy_values_to(this);
588 if (ScavengeRootsInCode) {
589 Universe::heap()->register_nmethod(this);
590 }
591 debug_only(Universe::heap()->verify_nmethod(this));
592 CodeCache::commit(this);
593 }
594
595 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
596 ttyLocker ttyl; // keep the following output all in one block
597 // This output goes directly to the tty, not the compiler log.
598 // To enable tools to match it up with the compilation activity,
599 // be sure to tag this tty output with the compile ID.
600 if (xtty != NULL) {
601 xtty->begin_head("print_native_nmethod");
602 xtty->method(_method);
603 xtty->stamp();
604 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
605 }
606 // print the header part first
607 print();
608 // then print the requested information
609 if (PrintNativeNMethods) {
610 print_code();
611 if (oop_maps != NULL) {
612 oop_maps->print();
613 }
614 }
615 if (PrintRelocations) {
616 print_relocations();
617 }
618 if (xtty != NULL) {
619 xtty->tail("print_native_nmethod");
620 }
621 }
622 }
623
624 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
625 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
626 }
627
628 nmethod::nmethod(
629 Method* method,
630 CompilerType type,
631 int nmethod_size,
632 int compile_id,
633 int entry_bci,
634 CodeOffsets* offsets,
635 int orig_pc_offset,
636 DebugInformationRecorder* debug_info,
637 Dependencies* dependencies,
638 CodeBuffer *code_buffer,
639 int frame_size,
640 OopMapSet* oop_maps,
641 ExceptionHandlerTable* handler_table,
642 ImplicitExceptionTable* nul_chk_table,
643 AbstractCompiler* compiler,
644 int comp_level
645 #if INCLUDE_JVMCI
646 , jweak installed_code,
647 jweak speculation_log
648 #endif
649 )
650 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
651 _native_receiver_sp_offset(in_ByteSize(-1)),
652 _native_basic_lock_sp_offset(in_ByteSize(-1))
653 {
654 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
655 {
656 debug_only(NoSafepointVerifier nsv;)
657 assert_locked_or_safepoint(CodeCache_lock);
658
659 _deopt_handler_begin = (address) this;
660 _deopt_mh_handler_begin = (address) this;
661
662 init_defaults();
663 _entry_bci = entry_bci;
664 _compile_id = compile_id;
665 _comp_level = comp_level;
666 _orig_pc_offset = orig_pc_offset;
667 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
668
669 // Section offsets
670 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
671 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
672 set_ctable_begin(header_begin() + _consts_offset);
673
674 #if INCLUDE_JVMCI
675 _jvmci_installed_code = installed_code;
676 _speculation_log = speculation_log;
677 oop obj = JNIHandles::resolve(installed_code);
678 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
679 _jvmci_installed_code_triggers_unloading = false;
680 } else {
681 _jvmci_installed_code_triggers_unloading = true;
682 }
683
684 if (compiler->is_jvmci()) {
685 // JVMCI might not produce any stub sections
686 if (offsets->value(CodeOffsets::Exceptions) != -1) {
687 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
688 } else {
689 _exception_offset = -1;
690 }
691 if (offsets->value(CodeOffsets::Deopt) != -1) {
692 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
693 } else {
694 _deopt_handler_begin = NULL;
695 }
696 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
697 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
698 } else {
699 _deopt_mh_handler_begin = NULL;
700 }
701 } else {
702 #endif
703 // Exception handler and deopt handler are in the stub section
704 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
705 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
706
707 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
708 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
709 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
710 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
711 } else {
712 _deopt_mh_handler_begin = NULL;
713 #if INCLUDE_JVMCI
714 }
715 #endif
716 }
717 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
718 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
719 } else {
720 _unwind_handler_offset = -1;
721 }
722
723 _oops_offset = data_offset();
724 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
725 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
726
727 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
728 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
729 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
730 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
731 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
732 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
733 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
734 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
735 _exception_cache = NULL;
736
737 _scopes_data_begin = (address) this + scopes_data_offset;
738
739 _pc_desc_container.reset_to(scopes_pcs_begin());
740
741 code_buffer->copy_code_and_locs_to(this);
742 // Copy contents of ScopeDescRecorder to nmethod
743 code_buffer->copy_values_to(this);
744 debug_info->copy_to(this);
745 dependencies->copy_to(this);
746 if (ScavengeRootsInCode) {
747 Universe::heap()->register_nmethod(this);
748 }
749 debug_only(Universe::heap()->verify_nmethod(this));
750
751 CodeCache::commit(this);
752
753 // Copy contents of ExceptionHandlerTable to nmethod
754 handler_table->copy_to(this);
755 nul_chk_table->copy_to(this);
756
757 // we use the information of entry points to find out if a method is
758 // static or non static
759 assert(compiler->is_c2() || compiler->is_jvmci() ||
760 _method->is_static() == (entry_point() == _verified_entry_point),
761 " entry points must be same for static methods and vice versa");
762 }
763 }
764
765 // Print a short set of xml attributes to identify this nmethod. The
766 // output should be embedded in some other element.
767 void nmethod::log_identity(xmlStream* log) const {
768 log->print(" compile_id='%d'", compile_id());
769 const char* nm_kind = compile_kind();
770 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
771 log->print(" compiler='%s'", compiler_name());
772 if (TieredCompilation) {
773 log->print(" level='%d'", comp_level());
774 }
775 }
776
777
778 #define LOG_OFFSET(log, name) \
779 if (p2i(name##_end()) - p2i(name##_begin())) \
780 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
781 p2i(name##_begin()) - p2i(this))
782
783
784 void nmethod::log_new_nmethod() const {
785 if (LogCompilation && xtty != NULL) {
786 ttyLocker ttyl;
787 HandleMark hm;
788 xtty->begin_elem("nmethod");
789 log_identity(xtty);
790 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
791 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
792
793 LOG_OFFSET(xtty, relocation);
794 LOG_OFFSET(xtty, consts);
795 LOG_OFFSET(xtty, insts);
796 LOG_OFFSET(xtty, stub);
797 LOG_OFFSET(xtty, scopes_data);
798 LOG_OFFSET(xtty, scopes_pcs);
799 LOG_OFFSET(xtty, dependencies);
800 LOG_OFFSET(xtty, handler_table);
801 LOG_OFFSET(xtty, nul_chk_table);
802 LOG_OFFSET(xtty, oops);
803 LOG_OFFSET(xtty, metadata);
804
805 xtty->method(method());
806 xtty->stamp();
807 xtty->end_elem();
808 }
809 }
810
811 #undef LOG_OFFSET
812
813
814 // Print out more verbose output usually for a newly created nmethod.
815 void nmethod::print_on(outputStream* st, const char* msg) const {
816 if (st != NULL) {
817 ttyLocker ttyl;
818 if (WizardMode) {
819 CompileTask::print(st, this, msg, /*short_form:*/ true);
820 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
821 } else {
822 CompileTask::print(st, this, msg, /*short_form:*/ false);
823 }
824 }
825 }
826
827 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
828 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
829 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
830 print_nmethod(printnmethods);
831 }
832 }
833
834 void nmethod::print_nmethod(bool printmethod) {
835 ttyLocker ttyl; // keep the following output all in one block
836 if (xtty != NULL) {
837 xtty->begin_head("print_nmethod");
838 xtty->stamp();
839 xtty->end_head();
840 }
841 // print the header part first
842 print();
843 // then print the requested information
844 if (printmethod) {
845 print_code();
846 print_pcs();
847 if (oop_maps()) {
848 oop_maps()->print();
849 }
850 }
851 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
852 print_scopes();
853 }
854 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
855 print_relocations();
856 }
857 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
858 print_dependencies();
859 }
860 if (printmethod || PrintExceptionHandlers) {
861 print_handler_table();
862 print_nul_chk_table();
863 }
864 if (printmethod) {
865 print_recorded_oops();
866 print_recorded_metadata();
867 }
868 if (xtty != NULL) {
869 xtty->tail("print_nmethod");
870 }
871 }
872
873
874 // Promote one word from an assembly-time handle to a live embedded oop.
875 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
876 if (handle == NULL ||
877 // As a special case, IC oops are initialized to 1 or -1.
878 handle == (jobject) Universe::non_oop_word()) {
879 (*dest) = (oop) handle;
880 } else {
881 (*dest) = JNIHandles::resolve_non_null(handle);
882 }
883 }
884
885
886 // Have to have the same name because it's called by a template
887 void nmethod::copy_values(GrowableArray<jobject>* array) {
888 int length = array->length();
889 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
890 oop* dest = oops_begin();
891 for (int index = 0 ; index < length; index++) {
892 initialize_immediate_oop(&dest[index], array->at(index));
893 }
894
895 // Now we can fix up all the oops in the code. We need to do this
896 // in the code because the assembler uses jobjects as placeholders.
897 // The code and relocations have already been initialized by the
898 // CodeBlob constructor, so it is valid even at this early point to
899 // iterate over relocations and patch the code.
900 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
901 }
902
903 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
904 int length = array->length();
905 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
906 Metadata** dest = metadata_begin();
907 for (int index = 0 ; index < length; index++) {
908 dest[index] = array->at(index);
909 }
910 }
911
912 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
913 // re-patch all oop-bearing instructions, just in case some oops moved
914 RelocIterator iter(this, begin, end);
915 while (iter.next()) {
916 if (iter.type() == relocInfo::oop_type) {
917 oop_Relocation* reloc = iter.oop_reloc();
918 if (initialize_immediates && reloc->oop_is_immediate()) {
919 oop* dest = reloc->oop_addr();
920 initialize_immediate_oop(dest, (jobject) *dest);
921 }
922 // Refresh the oop-related bits of this instruction.
923 reloc->fix_oop_relocation();
924 } else if (iter.type() == relocInfo::metadata_type) {
925 metadata_Relocation* reloc = iter.metadata_reloc();
926 reloc->fix_metadata_relocation();
927 }
928 }
929 }
930
931
932 void nmethod::verify_clean_inline_caches() {
933 assert_locked_or_safepoint(CompiledIC_lock);
934
935 // If the method is not entrant or zombie then a JMP is plastered over the
936 // first few bytes. If an oop in the old code was there, that oop
937 // should not get GC'd. Skip the first few bytes of oops on
938 // not-entrant methods.
939 address low_boundary = verified_entry_point();
940 if (!is_in_use()) {
941 low_boundary += NativeJump::instruction_size;
942 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
943 // This means that the low_boundary is going to be a little too high.
944 // This shouldn't matter, since oops of non-entrant methods are never used.
945 // In fact, why are we bothering to look at oops in a non-entrant method??
946 }
947
948 ResourceMark rm;
949 RelocIterator iter(this, low_boundary);
950 while(iter.next()) {
951 switch(iter.type()) {
952 case relocInfo::virtual_call_type:
953 case relocInfo::opt_virtual_call_type: {
954 CompiledIC *ic = CompiledIC_at(&iter);
955 // Ok, to lookup references to zombies here
956 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
957 nmethod* nm = cb->as_nmethod_or_null();
958 if( nm != NULL ) {
959 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
960 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
961 assert(ic->is_clean(), "IC should be clean");
962 }
963 }
964 break;
965 }
966 case relocInfo::static_call_type: {
967 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
968 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
969 nmethod* nm = cb->as_nmethod_or_null();
970 if( nm != NULL ) {
971 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
972 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
973 assert(csc->is_clean(), "IC should be clean");
974 }
975 }
976 break;
977 }
978 default:
979 break;
980 }
981 }
982 }
983
984 // This is a private interface with the sweeper.
985 void nmethod::mark_as_seen_on_stack() {
986 assert(is_alive(), "Must be an alive method");
987 // Set the traversal mark to ensure that the sweeper does 2
988 // cleaning passes before moving to zombie.
989 set_stack_traversal_mark(NMethodSweeper::traversal_count());
990 }
991
992 // Tell if a non-entrant method can be converted to a zombie (i.e.,
993 // there are no activations on the stack, not in use by the VM,
994 // and not in use by the ServiceThread)
995 bool nmethod::can_convert_to_zombie() {
996 assert(is_not_entrant(), "must be a non-entrant method");
997
998 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
999 // count can be greater than the stack traversal count before it hits the
1000 // nmethod for the second time.
1001 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1002 !is_locked_by_vm();
1003 }
1004
1005 void nmethod::inc_decompile_count() {
1006 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1007 // Could be gated by ProfileTraps, but do not bother...
1008 Method* m = method();
1009 if (m == NULL) return;
1010 MethodData* mdo = m->method_data();
1011 if (mdo == NULL) return;
1012 // There is a benign race here. See comments in methodData.hpp.
1013 mdo->inc_decompile_count();
1014 }
1015
1016 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1017
1018 post_compiled_method_unload();
1019
1020 // Since this nmethod is being unloaded, make sure that dependencies
1021 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1022 // indicate that this work is being done during a GC.
1023 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1024 assert(is_alive != NULL, "Should be non-NULL");
1025 // A non-NULL is_alive closure indicates that this is being called during GC.
1026 flush_dependencies(is_alive);
1027
1028 // Break cycle between nmethod & method
1029 LogTarget(Trace, class, unload) lt;
1030 if (lt.is_enabled()) {
1031 LogStream ls(lt);
1032 ls.print_cr("making nmethod " INTPTR_FORMAT
1033 " unloadable, Method*(" INTPTR_FORMAT
1034 "), cause(" INTPTR_FORMAT ")",
1035 p2i(this), p2i(_method), p2i(cause));
1036 if (!Universe::heap()->is_gc_active() && cause != NULL)
1037 cause->klass()->print_on(&ls);
1038 }
1039 // Unlink the osr method, so we do not look this up again
1040 if (is_osr_method()) {
1041 // Invalidate the osr nmethod only once
1042 if (is_in_use()) {
1043 invalidate_osr_method();
1044 }
1045 #ifdef ASSERT
1046 if (method() != NULL) {
1047 // Make sure osr nmethod is invalidated, i.e. not on the list
1048 bool found = method()->method_holder()->remove_osr_nmethod(this);
1049 assert(!found, "osr nmethod should have been invalidated");
1050 }
1051 #endif
1052 }
1053
1054 // If _method is already NULL the Method* is about to be unloaded,
1055 // so we don't have to break the cycle. Note that it is possible to
1056 // have the Method* live here, in case we unload the nmethod because
1057 // it is pointing to some oop (other than the Method*) being unloaded.
1058 if (_method != NULL) {
1059 // OSR methods point to the Method*, but the Method* does not
1060 // point back!
1061 if (_method->code() == this) {
1062 _method->clear_code(); // Break a cycle
1063 }
1064 _method = NULL; // Clear the method of this dead nmethod
1065 }
1066
1067 // Make the class unloaded - i.e., change state and notify sweeper
1068 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1069 if (is_in_use()) {
1070 // Transitioning directly from live to unloaded -- so
1071 // we need to force a cache clean-up; remember this
1072 // for later on.
1073 CodeCache::set_needs_cache_clean(true);
1074 }
1075
1076 // Unregister must be done before the state change
1077 Universe::heap()->unregister_nmethod(this);
1078
1079 _state = unloaded;
1080
1081 // Log the unloading.
1082 log_state_change();
1083
1084 #if INCLUDE_JVMCI
1085 // The method can only be unloaded after the pointer to the installed code
1086 // Java wrapper is no longer alive. Here we need to clear out this weak
1087 // reference to the dead object.
1088 maybe_invalidate_installed_code();
1089 #endif
1090
1091 // The Method* is gone at this point
1092 assert(_method == NULL, "Tautology");
1093
1094 set_osr_link(NULL);
1095 NMethodSweeper::report_state_change(this);
1096 }
1097
1098 void nmethod::invalidate_osr_method() {
1099 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1100 // Remove from list of active nmethods
1101 if (method() != NULL) {
1102 method()->method_holder()->remove_osr_nmethod(this);
1103 }
1104 }
1105
1106 void nmethod::log_state_change() const {
1107 if (LogCompilation) {
1108 if (xtty != NULL) {
1109 ttyLocker ttyl; // keep the following output all in one block
1110 if (_state == unloaded) {
1111 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1112 os::current_thread_id());
1113 } else {
1114 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1115 os::current_thread_id(),
1116 (_state == zombie ? " zombie='1'" : ""));
1117 }
1118 log_identity(xtty);
1119 xtty->stamp();
1120 xtty->end_elem();
1121 }
1122 }
1123
1124 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1125 CompileTask::print_ul(this, state_msg);
1126 if (PrintCompilation && _state != unloaded) {
1127 print_on(tty, state_msg);
1128 }
1129 }
1130
1131 /**
1132 * Common functionality for both make_not_entrant and make_zombie
1133 */
1134 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1135 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1136 assert(!is_zombie(), "should not already be a zombie");
1137
1138 if (_state == state) {
1139 // Avoid taking the lock if already in required state.
1140 // This is safe from races because the state is an end-state,
1141 // which the nmethod cannot back out of once entered.
1142 // No need for fencing either.
1143 return false;
1144 }
1145
1146 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1147 nmethodLocker nml(this);
1148 methodHandle the_method(method());
1149 NoSafepointVerifier nsv;
1150
1151 // during patching, depending on the nmethod state we must notify the GC that
1152 // code has been unloaded, unregistering it. We cannot do this right while
1153 // holding the Patching_lock because we need to use the CodeCache_lock. This
1154 // would be prone to deadlocks.
1155 // This flag is used to remember whether we need to later lock and unregister.
1156 bool nmethod_needs_unregister = false;
1157
1158 {
1159 // invalidate osr nmethod before acquiring the patching lock since
1160 // they both acquire leaf locks and we don't want a deadlock.
1161 // This logic is equivalent to the logic below for patching the
1162 // verified entry point of regular methods. We check that the
1163 // nmethod is in use to ensure that it is invalidated only once.
1164 if (is_osr_method() && is_in_use()) {
1165 // this effectively makes the osr nmethod not entrant
1166 invalidate_osr_method();
1167 }
1168
1169 // Enter critical section. Does not block for safepoint.
1170 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1171
1172 if (_state == state) {
1173 // another thread already performed this transition so nothing
1174 // to do, but return false to indicate this.
1175 return false;
1176 }
1177
1178 // The caller can be calling the method statically or through an inline
1179 // cache call.
1180 if (!is_osr_method() && !is_not_entrant()) {
1181 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1182 SharedRuntime::get_handle_wrong_method_stub());
1183 }
1184
1185 if (is_in_use() && update_recompile_counts()) {
1186 // It's a true state change, so mark the method as decompiled.
1187 // Do it only for transition from alive.
1188 inc_decompile_count();
1189 }
1190
1191 // If the state is becoming a zombie, signal to unregister the nmethod with
1192 // the heap.
1193 // This nmethod may have already been unloaded during a full GC.
1194 if ((state == zombie) && !is_unloaded()) {
1195 nmethod_needs_unregister = true;
1196 }
1197
1198 // Must happen before state change. Otherwise we have a race condition in
1199 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1200 // transition its state from 'not_entrant' to 'zombie' without having to wait
1201 // for stack scanning.
1202 if (state == not_entrant) {
1203 mark_as_seen_on_stack();
1204 OrderAccess::storestore(); // _stack_traversal_mark and _state
1205 }
1206
1207 // Change state
1208 _state = state;
1209
1210 // Log the transition once
1211 log_state_change();
1212
1213 // Invalidate while holding the patching lock
1214 JVMCI_ONLY(maybe_invalidate_installed_code());
1215
1216 // Remove nmethod from method.
1217 // We need to check if both the _code and _from_compiled_code_entry_point
1218 // refer to this nmethod because there is a race in setting these two fields
1219 // in Method* as seen in bugid 4947125.
1220 // If the vep() points to the zombie nmethod, the memory for the nmethod
1221 // could be flushed and the compiler and vtable stubs could still call
1222 // through it.
1223 if (method() != NULL && (method()->code() == this ||
1224 method()->from_compiled_entry() == verified_entry_point())) {
1225 HandleMark hm;
1226 method()->clear_code(false /* already owns Patching_lock */);
1227 }
1228 } // leave critical region under Patching_lock
1229
1230 #ifdef ASSERT
1231 if (is_osr_method() && method() != NULL) {
1232 // Make sure osr nmethod is invalidated, i.e. not on the list
1233 bool found = method()->method_holder()->remove_osr_nmethod(this);
1234 assert(!found, "osr nmethod should have been invalidated");
1235 }
1236 #endif
1237
1238 // When the nmethod becomes zombie it is no longer alive so the
1239 // dependencies must be flushed. nmethods in the not_entrant
1240 // state will be flushed later when the transition to zombie
1241 // happens or they get unloaded.
1242 if (state == zombie) {
1243 {
1244 // Flushing dependencies must be done before any possible
1245 // safepoint can sneak in, otherwise the oops used by the
1246 // dependency logic could have become stale.
1247 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1248 if (nmethod_needs_unregister) {
1249 Universe::heap()->unregister_nmethod(this);
1250 }
1251 flush_dependencies(NULL);
1252 }
1253
1254 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1255 // event and it hasn't already been reported for this nmethod then
1256 // report it now. The event may have been reported earlier if the GC
1257 // marked it for unloading). JvmtiDeferredEventQueue support means
1258 // we no longer go to a safepoint here.
1259 post_compiled_method_unload();
1260
1261 #ifdef ASSERT
1262 // It's no longer safe to access the oops section since zombie
1263 // nmethods aren't scanned for GC.
1264 _oops_are_stale = true;
1265 #endif
1266 // the Method may be reclaimed by class unloading now that the
1267 // nmethod is in zombie state
1268 set_method(NULL);
1269 } else {
1270 assert(state == not_entrant, "other cases may need to be handled differently");
1271 }
1272
1273 if (TraceCreateZombies) {
1274 ResourceMark m;
1275 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");
1276 }
1277
1278 NMethodSweeper::report_state_change(this);
1279 return true;
1280 }
1281
1282 void nmethod::flush() {
1283 // Note that there are no valid oops in the nmethod anymore.
1284 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1285 "osr nmethod must be unloaded or zombie before flushing");
1286 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1287 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1288 assert_locked_or_safepoint(CodeCache_lock);
1289
1290 // completely deallocate this method
1291 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1292 if (PrintMethodFlushing) {
1293 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1294 "/Free CodeCache:" SIZE_FORMAT "Kb",
1295 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1296 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1297 }
1298
1299 // We need to deallocate any ExceptionCache data.
1300 // Note that we do not need to grab the nmethod lock for this, it
1301 // better be thread safe if we're disposing of it!
1302 ExceptionCache* ec = exception_cache();
1303 set_exception_cache(NULL);
1304 while(ec != NULL) {
1305 ExceptionCache* next = ec->next();
1306 delete ec;
1307 ec = next;
1308 }
1309
1310 if (on_scavenge_root_list()) {
1311 CodeCache::drop_scavenge_root_nmethod(this);
1312 }
1313
1314 #if INCLUDE_JVMCI
1315 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1316 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1317 #endif
1318
1319 CodeBlob::flush();
1320 CodeCache::free(this);
1321 }
1322
1323 //
1324 // Notify all classes this nmethod is dependent on that it is no
1325 // longer dependent. This should only be called in two situations.
1326 // First, when a nmethod transitions to a zombie all dependents need
1327 // to be clear. Since zombification happens at a safepoint there's no
1328 // synchronization issues. The second place is a little more tricky.
1329 // During phase 1 of mark sweep class unloading may happen and as a
1330 // result some nmethods may get unloaded. In this case the flushing
1331 // of dependencies must happen during phase 1 since after GC any
1332 // dependencies in the unloaded nmethod won't be updated, so
1333 // traversing the dependency information in unsafe. In that case this
1334 // function is called with a non-NULL argument and this function only
1335 // notifies instanceKlasses that are reachable
1336
1337 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1338 assert_locked_or_safepoint(CodeCache_lock);
1339 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1340 "is_alive is non-NULL if and only if we are called during GC");
1341 if (!has_flushed_dependencies()) {
1342 set_has_flushed_dependencies();
1343 for (Dependencies::DepStream deps(this); deps.next(); ) {
1344 if (deps.type() == Dependencies::call_site_target_value) {
1345 // CallSite dependencies are managed on per-CallSite instance basis.
1346 oop call_site = deps.argument_oop(0);
1347 MethodHandles::remove_dependent_nmethod(call_site, this);
1348 } else {
1349 Klass* klass = deps.context_type();
1350 if (klass == NULL) {
1351 continue; // ignore things like evol_method
1352 }
1353 // During GC the is_alive closure is non-NULL, and is used to
1354 // determine liveness of dependees that need to be updated.
1355 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1356 // The GC defers deletion of this entry, since there might be multiple threads
1357 // iterating over the _dependencies graph. Other call paths are single-threaded
1358 // and may delete it immediately.
1359 bool delete_immediately = is_alive == NULL;
1360 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1361 }
1362 }
1363 }
1364 }
1365 }
1366
1367
1368 // If this oop is not live, the nmethod can be unloaded.
1369 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1370 assert(root != NULL, "just checking");
1371 oop obj = *root;
1372 if (obj == NULL || is_alive->do_object_b(obj)) {
1373 return false;
1374 }
1375
1376 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1377 // simply because one of its constant oops has gone dead.
1378 // No actual classes need to be unloaded in order for this to occur.
1379 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1380 make_unloaded(is_alive, obj);
1381 return true;
1382 }
1383
1384 // ------------------------------------------------------------------
1385 // post_compiled_method_load_event
1386 // new method for install_code() path
1387 // Transfer information from compilation to jvmti
1388 void nmethod::post_compiled_method_load_event() {
1389
1390 Method* moop = method();
1391 HOTSPOT_COMPILED_METHOD_LOAD(
1392 (char *) moop->klass_name()->bytes(),
1393 moop->klass_name()->utf8_length(),
1394 (char *) moop->name()->bytes(),
1395 moop->name()->utf8_length(),
1396 (char *) moop->signature()->bytes(),
1397 moop->signature()->utf8_length(),
1398 insts_begin(), insts_size());
1399
1400 if (JvmtiExport::should_post_compiled_method_load() ||
1401 JvmtiExport::should_post_compiled_method_unload()) {
1402 get_and_cache_jmethod_id();
1403 }
1404
1405 if (JvmtiExport::should_post_compiled_method_load()) {
1406 // Let the Service thread (which is a real Java thread) post the event
1407 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1408 JvmtiDeferredEventQueue::enqueue(
1409 JvmtiDeferredEvent::compiled_method_load_event(this));
1410 }
1411 }
1412
1413 jmethodID nmethod::get_and_cache_jmethod_id() {
1414 if (_jmethod_id == NULL) {
1415 // Cache the jmethod_id since it can no longer be looked up once the
1416 // method itself has been marked for unloading.
1417 _jmethod_id = method()->jmethod_id();
1418 }
1419 return _jmethod_id;
1420 }
1421
1422 void nmethod::post_compiled_method_unload() {
1423 if (unload_reported()) {
1424 // During unloading we transition to unloaded and then to zombie
1425 // and the unloading is reported during the first transition.
1426 return;
1427 }
1428
1429 assert(_method != NULL && !is_unloaded(), "just checking");
1430 DTRACE_METHOD_UNLOAD_PROBE(method());
1431
1432 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1433 // post the event. Sometime later this nmethod will be made a zombie
1434 // by the sweeper but the Method* will not be valid at that point.
1435 // If the _jmethod_id is null then no load event was ever requested
1436 // so don't bother posting the unload. The main reason for this is
1437 // that the jmethodID is a weak reference to the Method* so if
1438 // it's being unloaded there's no way to look it up since the weak
1439 // ref will have been cleared.
1440 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1441 assert(!unload_reported(), "already unloaded");
1442 JvmtiDeferredEvent event =
1443 JvmtiDeferredEvent::compiled_method_unload_event(this,
1444 _jmethod_id, insts_begin());
1445 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1446 JvmtiDeferredEventQueue::enqueue(event);
1447 }
1448
1449 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1450 // any time. As the nmethod is being unloaded now we mark it has
1451 // having the unload event reported - this will ensure that we don't
1452 // attempt to report the event in the unlikely scenario where the
1453 // event is enabled at the time the nmethod is made a zombie.
1454 set_unload_reported();
1455 }
1456
1457 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1458 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1459
1460 oop_Relocation* r = iter_at_oop->oop_reloc();
1461 // Traverse those oops directly embedded in the code.
1462 // Other oops (oop_index>0) are seen as part of scopes_oops.
1463 assert(1 == (r->oop_is_immediate()) +
1464 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1465 "oop must be found in exactly one place");
1466 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1467 // Unload this nmethod if the oop is dead.
1468 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1469 return true;;
1470 }
1471 }
1472
1473 return false;
1474 }
1475
1476 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1477 // Scopes
1478 for (oop* p = oops_begin(); p < oops_end(); p++) {
1479 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1480 if (can_unload(is_alive, p, unloading_occurred)) {
1481 return true;
1482 }
1483 }
1484 return false;
1485 }
1486
1487 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1488 // Compiled code
1489 {
1490 RelocIterator iter(this, low_boundary);
1491 while (iter.next()) {
1492 if (iter.type() == relocInfo::oop_type) {
1493 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1494 return true;
1495 }
1496 }
1497 }
1498 }
1499
1500 return do_unloading_scopes(is_alive, unloading_occurred);
1501 }
1502
1503 #if INCLUDE_JVMCI
1504 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1505 if (_jvmci_installed_code != NULL) {
1506 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
1507 if (_jvmci_installed_code_triggers_unloading) {
1508 if (installed_code == NULL) {
1509 // jweak reference processing has already cleared the referent
1510 make_unloaded(is_alive, NULL);
1511 return true;
1512 } else if (can_unload(is_alive, (oop*)&installed_code, unloading_occurred)) {
1513 return true;
1514 }
1515 } else {
1516 if (installed_code == NULL || !is_alive->do_object_b(installed_code)) {
1517 clear_jvmci_installed_code();
1518 }
1519 }
1520 }
1521 return false;
1522 }
1523 #endif
1524
1525 // Iterate over metadata calling this function. Used by RedefineClasses
1526 void nmethod::metadata_do(void f(Metadata*)) {
1527 address low_boundary = verified_entry_point();
1528 if (is_not_entrant()) {
1529 low_boundary += NativeJump::instruction_size;
1530 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1531 // (See comment above.)
1532 }
1533 {
1534 // Visit all immediate references that are embedded in the instruction stream.
1535 RelocIterator iter(this, low_boundary);
1536 while (iter.next()) {
1537 if (iter.type() == relocInfo::metadata_type ) {
1538 metadata_Relocation* r = iter.metadata_reloc();
1539 // In this metadata, we must only follow those metadatas directly embedded in
1540 // the code. Other metadatas (oop_index>0) are seen as part of
1541 // the metadata section below.
1542 assert(1 == (r->metadata_is_immediate()) +
1543 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1544 "metadata must be found in exactly one place");
1545 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1546 Metadata* md = r->metadata_value();
1547 if (md != _method) f(md);
1548 }
1549 } else if (iter.type() == relocInfo::virtual_call_type) {
1550 // Check compiledIC holders associated with this nmethod
1551 CompiledIC *ic = CompiledIC_at(&iter);
1552 if (ic->is_icholder_call()) {
1553 CompiledICHolder* cichk = ic->cached_icholder();
1554 f(cichk->holder_method());
1555 f(cichk->holder_klass());
1556 } else {
1557 Metadata* ic_oop = ic->cached_metadata();
1558 if (ic_oop != NULL) {
1559 f(ic_oop);
1560 }
1561 }
1562 }
1563 }
1564 }
1565
1566 // Visit the metadata section
1567 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1568 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1569 Metadata* md = *p;
1570 f(md);
1571 }
1572
1573 // Visit metadata not embedded in the other places.
1574 if (_method != NULL) f(_method);
1575 }
1576
1577 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1578 // make sure the oops ready to receive visitors
1579 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1580 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1581
1582 // If the method is not entrant or zombie then a JMP is plastered over the
1583 // first few bytes. If an oop in the old code was there, that oop
1584 // should not get GC'd. Skip the first few bytes of oops on
1585 // not-entrant methods.
1586 address low_boundary = verified_entry_point();
1587 if (is_not_entrant()) {
1588 low_boundary += NativeJump::instruction_size;
1589 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1590 // (See comment above.)
1591 }
1592
1593 RelocIterator iter(this, low_boundary);
1594
1595 while (iter.next()) {
1596 if (iter.type() == relocInfo::oop_type ) {
1597 oop_Relocation* r = iter.oop_reloc();
1598 // In this loop, we must only follow those oops directly embedded in
1599 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1600 assert(1 == (r->oop_is_immediate()) +
1601 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1602 "oop must be found in exactly one place");
1603 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1604 f->do_oop(r->oop_addr());
1605 }
1606 }
1607 }
1608
1609 // Scopes
1610 // This includes oop constants not inlined in the code stream.
1611 for (oop* p = oops_begin(); p < oops_end(); p++) {
1612 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1613 f->do_oop(p);
1614 }
1615 }
1616
1617 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1618
1619 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1620
1621 // An nmethod is "marked" if its _mark_link is set non-null.
1622 // Even if it is the end of the linked list, it will have a non-null link value,
1623 // as long as it is on the list.
1624 // This code must be MP safe, because it is used from parallel GC passes.
1625 bool nmethod::test_set_oops_do_mark() {
1626 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1627 if (_oops_do_mark_link == NULL) {
1628 // Claim this nmethod for this thread to mark.
1629 if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) {
1630 // Atomically append this nmethod (now claimed) to the head of the list:
1631 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1632 for (;;) {
1633 nmethod* required_mark_nmethods = observed_mark_nmethods;
1634 _oops_do_mark_link = required_mark_nmethods;
1635 observed_mark_nmethods =
1636 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1637 if (observed_mark_nmethods == required_mark_nmethods)
1638 break;
1639 }
1640 // Mark was clear when we first saw this guy.
1641 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1642 return false;
1643 }
1644 }
1645 // On fall through, another racing thread marked this nmethod before we did.
1646 return true;
1647 }
1648
1649 void nmethod::oops_do_marking_prologue() {
1650 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1651 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1652 // We use cmpxchg instead of regular assignment here because the user
1653 // may fork a bunch of threads, and we need them all to see the same state.
1654 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1655 guarantee(observed == NULL, "no races in this sequential code");
1656 }
1657
1658 void nmethod::oops_do_marking_epilogue() {
1659 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1660 nmethod* cur = _oops_do_mark_nmethods;
1661 while (cur != NMETHOD_SENTINEL) {
1662 assert(cur != NULL, "not NULL-terminated");
1663 nmethod* next = cur->_oops_do_mark_link;
1664 cur->_oops_do_mark_link = NULL;
1665 DEBUG_ONLY(cur->verify_oop_relocations());
1666 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1667 cur = next;
1668 }
1669 nmethod* required = _oops_do_mark_nmethods;
1670 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1671 guarantee(observed == required, "no races in this sequential code");
1672 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1673 }
1674
1675 class DetectScavengeRoot: public OopClosure {
1676 bool _detected_scavenge_root;
1677 public:
1678 DetectScavengeRoot() : _detected_scavenge_root(false)
1679 { NOT_PRODUCT(_print_nm = NULL); }
1680 bool detected_scavenge_root() { return _detected_scavenge_root; }
1681 virtual void do_oop(oop* p) {
1682 if ((*p) != NULL && (*p)->is_scavengable()) {
1683 NOT_PRODUCT(maybe_print(p));
1684 _detected_scavenge_root = true;
1685 }
1686 }
1687 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1688
1689 #ifndef PRODUCT
1690 nmethod* _print_nm;
1691 void maybe_print(oop* p) {
1692 if (_print_nm == NULL) return;
1693 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1694 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1695 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1696 p2i(*p), p2i(p));
1697 (*p)->print();
1698 }
1699 #endif //PRODUCT
1700 };
1701
1702 bool nmethod::detect_scavenge_root_oops() {
1703 DetectScavengeRoot detect_scavenge_root;
1704 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1705 oops_do(&detect_scavenge_root);
1706 return detect_scavenge_root.detected_scavenge_root();
1707 }
1708
1709 inline bool includes(void* p, void* from, void* to) {
1710 return from <= p && p < to;
1711 }
1712
1713
1714 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1715 assert(count >= 2, "must be sentinel values, at least");
1716
1717 #ifdef ASSERT
1718 // must be sorted and unique; we do a binary search in find_pc_desc()
1719 int prev_offset = pcs[0].pc_offset();
1720 assert(prev_offset == PcDesc::lower_offset_limit,
1721 "must start with a sentinel");
1722 for (int i = 1; i < count; i++) {
1723 int this_offset = pcs[i].pc_offset();
1724 assert(this_offset > prev_offset, "offsets must be sorted");
1725 prev_offset = this_offset;
1726 }
1727 assert(prev_offset == PcDesc::upper_offset_limit,
1728 "must end with a sentinel");
1729 #endif //ASSERT
1730
1731 // Search for MethodHandle invokes and tag the nmethod.
1732 for (int i = 0; i < count; i++) {
1733 if (pcs[i].is_method_handle_invoke()) {
1734 set_has_method_handle_invokes(true);
1735 break;
1736 }
1737 }
1738 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1739
1740 int size = count * sizeof(PcDesc);
1741 assert(scopes_pcs_size() >= size, "oob");
1742 memcpy(scopes_pcs_begin(), pcs, size);
1743
1744 // Adjust the final sentinel downward.
1745 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1746 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1747 last_pc->set_pc_offset(content_size() + 1);
1748 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1749 // Fill any rounding gaps with copies of the last record.
1750 last_pc[1] = last_pc[0];
1751 }
1752 // The following assert could fail if sizeof(PcDesc) is not
1753 // an integral multiple of oopSize (the rounding term).
1754 // If it fails, change the logic to always allocate a multiple
1755 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1756 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1757 }
1758
1759 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1760 assert(scopes_data_size() >= size, "oob");
1761 memcpy(scopes_data_begin(), buffer, size);
1762 }
1763
1764 #ifdef ASSERT
1765 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1766 PcDesc* lower = search.scopes_pcs_begin();
1767 PcDesc* upper = search.scopes_pcs_end();
1768 lower += 1; // exclude initial sentinel
1769 PcDesc* res = NULL;
1770 for (PcDesc* p = lower; p < upper; p++) {
1771 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1772 if (match_desc(p, pc_offset, approximate)) {
1773 if (res == NULL)
1774 res = p;
1775 else
1776 res = (PcDesc*) badAddress;
1777 }
1778 }
1779 return res;
1780 }
1781 #endif
1782
1783
1784 // Finds a PcDesc with real-pc equal to "pc"
1785 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1786 address base_address = search.code_begin();
1787 if ((pc < base_address) ||
1788 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1789 return NULL; // PC is wildly out of range
1790 }
1791 int pc_offset = (int) (pc - base_address);
1792
1793 // Check the PcDesc cache if it contains the desired PcDesc
1794 // (This as an almost 100% hit rate.)
1795 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1796 if (res != NULL) {
1797 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1798 return res;
1799 }
1800
1801 // Fallback algorithm: quasi-linear search for the PcDesc
1802 // Find the last pc_offset less than the given offset.
1803 // The successor must be the required match, if there is a match at all.
1804 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1805 PcDesc* lower = search.scopes_pcs_begin();
1806 PcDesc* upper = search.scopes_pcs_end();
1807 upper -= 1; // exclude final sentinel
1808 if (lower >= upper) return NULL; // native method; no PcDescs at all
1809
1810 #define assert_LU_OK \
1811 /* invariant on lower..upper during the following search: */ \
1812 assert(lower->pc_offset() < pc_offset, "sanity"); \
1813 assert(upper->pc_offset() >= pc_offset, "sanity")
1814 assert_LU_OK;
1815
1816 // Use the last successful return as a split point.
1817 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1818 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1819 if (mid->pc_offset() < pc_offset) {
1820 lower = mid;
1821 } else {
1822 upper = mid;
1823 }
1824
1825 // Take giant steps at first (4096, then 256, then 16, then 1)
1826 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1827 const int RADIX = (1 << LOG2_RADIX);
1828 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1829 while ((mid = lower + step) < upper) {
1830 assert_LU_OK;
1831 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1832 if (mid->pc_offset() < pc_offset) {
1833 lower = mid;
1834 } else {
1835 upper = mid;
1836 break;
1837 }
1838 }
1839 assert_LU_OK;
1840 }
1841
1842 // Sneak up on the value with a linear search of length ~16.
1843 while (true) {
1844 assert_LU_OK;
1845 mid = lower + 1;
1846 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1847 if (mid->pc_offset() < pc_offset) {
1848 lower = mid;
1849 } else {
1850 upper = mid;
1851 break;
1852 }
1853 }
1854 #undef assert_LU_OK
1855
1856 if (match_desc(upper, pc_offset, approximate)) {
1857 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1858 _pc_desc_cache.add_pc_desc(upper);
1859 return upper;
1860 } else {
1861 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1862 return NULL;
1863 }
1864 }
1865
1866
1867 void nmethod::check_all_dependencies(DepChange& changes) {
1868 // Checked dependencies are allocated into this ResourceMark
1869 ResourceMark rm;
1870
1871 // Turn off dependency tracing while actually testing dependencies.
1872 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1873
1874 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1875 &DependencySignature::equals, 11027> DepTable;
1876
1877 DepTable* table = new DepTable();
1878
1879 // Iterate over live nmethods and check dependencies of all nmethods that are not
1880 // marked for deoptimization. A particular dependency is only checked once.
1881 NMethodIterator iter;
1882 while(iter.next()) {
1883 nmethod* nm = iter.method();
1884 // Only notify for live nmethods
1885 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1886 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1887 // Construct abstraction of a dependency.
1888 DependencySignature* current_sig = new DependencySignature(deps);
1889
1890 // Determine if dependency is already checked. table->put(...) returns
1891 // 'true' if the dependency is added (i.e., was not in the hashtable).
1892 if (table->put(*current_sig, 1)) {
1893 if (deps.check_dependency() != NULL) {
1894 // Dependency checking failed. Print out information about the failed
1895 // dependency and finally fail with an assert. We can fail here, since
1896 // dependency checking is never done in a product build.
1897 tty->print_cr("Failed dependency:");
1898 changes.print();
1899 nm->print();
1900 nm->print_dependencies();
1901 assert(false, "Should have been marked for deoptimization");
1902 }
1903 }
1904 }
1905 }
1906 }
1907 }
1908
1909 bool nmethod::check_dependency_on(DepChange& changes) {
1910 // What has happened:
1911 // 1) a new class dependee has been added
1912 // 2) dependee and all its super classes have been marked
1913 bool found_check = false; // set true if we are upset
1914 for (Dependencies::DepStream deps(this); deps.next(); ) {
1915 // Evaluate only relevant dependencies.
1916 if (deps.spot_check_dependency_at(changes) != NULL) {
1917 found_check = true;
1918 NOT_DEBUG(break);
1919 }
1920 }
1921 return found_check;
1922 }
1923
1924 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1925 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1926 Array<Method*>* dependee_methods = dependee_ik->methods();
1927 for (Dependencies::DepStream deps(this); deps.next(); ) {
1928 if (deps.type() == Dependencies::evol_method) {
1929 Method* method = deps.method_argument(0);
1930 for (int j = 0; j < dependee_methods->length(); j++) {
1931 if (dependee_methods->at(j) == method) {
1932 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1933 ResourceMark rm;
1934 log_debug(redefine, class, nmethod)
1935 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1936 _method->method_holder()->external_name(),
1937 _method->name()->as_C_string(),
1938 _method->signature()->as_C_string(),
1939 compile_id(),
1940 method->method_holder()->external_name(),
1941 method->name()->as_C_string(),
1942 method->signature()->as_C_string());
1943 }
1944 if (TraceDependencies || LogCompilation)
1945 deps.log_dependency(dependee);
1946 return true;
1947 }
1948 }
1949 }
1950 }
1951 return false;
1952 }
1953
1954 // Called from mark_for_deoptimization, when dependee is invalidated.
1955 bool nmethod::is_dependent_on_method(Method* dependee) {
1956 for (Dependencies::DepStream deps(this); deps.next(); ) {
1957 if (deps.type() != Dependencies::evol_method)
1958 continue;
1959 Method* method = deps.method_argument(0);
1960 if (method == dependee) return true;
1961 }
1962 return false;
1963 }
1964
1965
1966 bool nmethod::is_patchable_at(address instr_addr) {
1967 assert(insts_contains(instr_addr), "wrong nmethod used");
1968 if (is_zombie()) {
1969 // a zombie may never be patched
1970 return false;
1971 }
1972 return true;
1973 }
1974
1975
1976 address nmethod::continuation_for_implicit_exception(address pc) {
1977 // Exception happened outside inline-cache check code => we are inside
1978 // an active nmethod => use cpc to determine a return address
1979 int exception_offset = pc - code_begin();
1980 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1981 #ifdef ASSERT
1982 if (cont_offset == 0) {
1983 Thread* thread = Thread::current();
1984 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1985 HandleMark hm(thread);
1986 ResourceMark rm(thread);
1987 CodeBlob* cb = CodeCache::find_blob(pc);
1988 assert(cb != NULL && cb == this, "");
1989 ttyLocker ttyl;
1990 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
1991 print();
1992 method()->print_codes();
1993 print_code();
1994 print_pcs();
1995 }
1996 #endif
1997 if (cont_offset == 0) {
1998 // Let the normal error handling report the exception
1999 return NULL;
2000 }
2001 return code_begin() + cont_offset;
2002 }
2003
2004
2005
2006 void nmethod_init() {
2007 // make sure you didn't forget to adjust the filler fields
2008 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2009 }
2010
2011
2012 //-------------------------------------------------------------------------------------------
2013
2014
2015 // QQQ might we make this work from a frame??
2016 nmethodLocker::nmethodLocker(address pc) {
2017 CodeBlob* cb = CodeCache::find_blob(pc);
2018 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2019 _nm = cb->as_compiled_method();
2020 lock_nmethod(_nm);
2021 }
2022
2023 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2024 // should pass zombie_ok == true.
2025 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2026 if (cm == NULL) return;
2027 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2028 nmethod* nm = cm->as_nmethod();
2029 Atomic::inc(&nm->_lock_count);
2030 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2031 }
2032
2033 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2034 if (cm == NULL) return;
2035 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2036 nmethod* nm = cm->as_nmethod();
2037 Atomic::dec(&nm->_lock_count);
2038 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2039 }
2040
2041
2042 // -----------------------------------------------------------------------------
2043 // Verification
2044
2045 class VerifyOopsClosure: public OopClosure {
2046 nmethod* _nm;
2047 bool _ok;
2048 public:
2049 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2050 bool ok() { return _ok; }
2051 virtual void do_oop(oop* p) {
2052 if (oopDesc::is_oop_or_null(*p)) return;
2053 if (_ok) {
2054 _nm->print_nmethod(true);
2055 _ok = false;
2056 }
2057 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2058 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2059 }
2060 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2061 };
2062
2063 void nmethod::verify() {
2064
2065 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2066 // seems odd.
2067
2068 if (is_zombie() || is_not_entrant() || is_unloaded())
2069 return;
2070
2071 // Make sure all the entry points are correctly aligned for patching.
2072 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2073
2074 // assert(oopDesc::is_oop(method()), "must be valid");
2075
2076 ResourceMark rm;
2077
2078 if (!CodeCache::contains(this)) {
2079 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2080 }
2081
2082 if(is_native_method() )
2083 return;
2084
2085 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2086 if (nm != this) {
2087 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2088 }
2089
2090 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2091 if (! p->verify(this)) {
2092 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2093 }
2094 }
2095
2096 VerifyOopsClosure voc(this);
2097 oops_do(&voc);
2098 assert(voc.ok(), "embedded oops must be OK");
2099 Universe::heap()->verify_nmethod(this);
2100
2101 verify_scopes();
2102 }
2103
2104
2105 void nmethod::verify_interrupt_point(address call_site) {
2106 // Verify IC only when nmethod installation is finished.
2107 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2108 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2109 if (is_installed) {
2110 Thread *cur = Thread::current();
2111 if (CompiledIC_lock->owner() == cur ||
2112 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2113 SafepointSynchronize::is_at_safepoint())) {
2114 CompiledIC_at(this, call_site);
2115 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2116 } else {
2117 MutexLocker ml_verify (CompiledIC_lock);
2118 CompiledIC_at(this, call_site);
2119 }
2120 }
2121
2122 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2123 assert(pd != NULL, "PcDesc must exist");
2124 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2125 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2126 pd->return_oop());
2127 !sd->is_top(); sd = sd->sender()) {
2128 sd->verify();
2129 }
2130 }
2131
2132 void nmethod::verify_scopes() {
2133 if( !method() ) return; // Runtime stubs have no scope
2134 if (method()->is_native()) return; // Ignore stub methods.
2135 // iterate through all interrupt point
2136 // and verify the debug information is valid.
2137 RelocIterator iter((nmethod*)this);
2138 while (iter.next()) {
2139 address stub = NULL;
2140 switch (iter.type()) {
2141 case relocInfo::virtual_call_type:
2142 verify_interrupt_point(iter.addr());
2143 break;
2144 case relocInfo::opt_virtual_call_type:
2145 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2146 verify_interrupt_point(iter.addr());
2147 break;
2148 case relocInfo::static_call_type:
2149 stub = iter.static_call_reloc()->static_stub(false);
2150 //verify_interrupt_point(iter.addr());
2151 break;
2152 case relocInfo::runtime_call_type:
2153 case relocInfo::runtime_call_w_cp_type: {
2154 address destination = iter.reloc()->value();
2155 // Right now there is no way to find out which entries support
2156 // an interrupt point. It would be nice if we had this
2157 // information in a table.
2158 break;
2159 }
2160 default:
2161 break;
2162 }
2163 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2164 }
2165 }
2166
2167
2168 // -----------------------------------------------------------------------------
2169 // Non-product code
2170 #ifndef PRODUCT
2171
2172 class DebugScavengeRoot: public OopClosure {
2173 nmethod* _nm;
2174 bool _ok;
2175 public:
2176 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2177 bool ok() { return _ok; }
2178 virtual void do_oop(oop* p) {
2179 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2180 if (_ok) {
2181 _nm->print_nmethod(true);
2182 _ok = false;
2183 }
2184 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2185 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2186 (*p)->print();
2187 }
2188 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2189 };
2190
2191 void nmethod::verify_scavenge_root_oops() {
2192 if (!on_scavenge_root_list()) {
2193 // Actually look inside, to verify the claim that it's clean.
2194 DebugScavengeRoot debug_scavenge_root(this);
2195 oops_do(&debug_scavenge_root);
2196 if (!debug_scavenge_root.ok())
2197 fatal("found an unadvertised bad scavengable oop in the code cache");
2198 }
2199 assert(scavenge_root_not_marked(), "");
2200 }
2201
2202 #endif // PRODUCT
2203
2204 // Printing operations
2205
2206 void nmethod::print() const {
2207 ResourceMark rm;
2208 ttyLocker ttyl; // keep the following output all in one block
2209
2210 tty->print("Compiled method ");
2211
2212 if (is_compiled_by_c1()) {
2213 tty->print("(c1) ");
2214 } else if (is_compiled_by_c2()) {
2215 tty->print("(c2) ");
2216 } else if (is_compiled_by_jvmci()) {
2217 tty->print("(JVMCI) ");
2218 } else {
2219 tty->print("(nm) ");
2220 }
2221
2222 print_on(tty, NULL);
2223
2224 if (WizardMode) {
2225 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2226 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2227 tty->print(" { ");
2228 tty->print_cr("%s ", state());
2229 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2230 tty->print_cr("}:");
2231 }
2232 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2233 p2i(this),
2234 p2i(this) + size(),
2235 size());
2236 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2237 p2i(relocation_begin()),
2238 p2i(relocation_end()),
2239 relocation_size());
2240 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2241 p2i(consts_begin()),
2242 p2i(consts_end()),
2243 consts_size());
2244 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2245 p2i(insts_begin()),
2246 p2i(insts_end()),
2247 insts_size());
2248 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2249 p2i(stub_begin()),
2250 p2i(stub_end()),
2251 stub_size());
2252 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2253 p2i(oops_begin()),
2254 p2i(oops_end()),
2255 oops_size());
2256 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2257 p2i(metadata_begin()),
2258 p2i(metadata_end()),
2259 metadata_size());
2260 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2261 p2i(scopes_data_begin()),
2262 p2i(scopes_data_end()),
2263 scopes_data_size());
2264 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2265 p2i(scopes_pcs_begin()),
2266 p2i(scopes_pcs_end()),
2267 scopes_pcs_size());
2268 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2269 p2i(dependencies_begin()),
2270 p2i(dependencies_end()),
2271 dependencies_size());
2272 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2273 p2i(handler_table_begin()),
2274 p2i(handler_table_end()),
2275 handler_table_size());
2276 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2277 p2i(nul_chk_table_begin()),
2278 p2i(nul_chk_table_end()),
2279 nul_chk_table_size());
2280 }
2281
2282 #ifndef PRODUCT
2283
2284 void nmethod::print_scopes() {
2285 // Find the first pc desc for all scopes in the code and print it.
2286 ResourceMark rm;
2287 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2288 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2289 continue;
2290
2291 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2292 while (sd != NULL) {
2293 sd->print_on(tty, p);
2294 sd = sd->sender();
2295 }
2296 }
2297 }
2298
2299 void nmethod::print_dependencies() {
2300 ResourceMark rm;
2301 ttyLocker ttyl; // keep the following output all in one block
2302 tty->print_cr("Dependencies:");
2303 for (Dependencies::DepStream deps(this); deps.next(); ) {
2304 deps.print_dependency();
2305 Klass* ctxk = deps.context_type();
2306 if (ctxk != NULL) {
2307 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2308 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2309 }
2310 }
2311 deps.log_dependency(); // put it into the xml log also
2312 }
2313 }
2314
2315
2316 void nmethod::print_relocations() {
2317 ResourceMark m; // in case methods get printed via the debugger
2318 tty->print_cr("relocations:");
2319 RelocIterator iter(this);
2320 iter.print();
2321 }
2322
2323
2324 void nmethod::print_pcs() {
2325 ResourceMark m; // in case methods get printed via debugger
2326 tty->print_cr("pc-bytecode offsets:");
2327 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2328 p->print(this);
2329 }
2330 }
2331
2332 void nmethod::print_recorded_oops() {
2333 tty->print_cr("Recorded oops:");
2334 for (int i = 0; i < oops_count(); i++) {
2335 oop o = oop_at(i);
2336 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2337 if (o == (oop)Universe::non_oop_word()) {
2338 tty->print("non-oop word");
2339 } else {
2340 o->print_value();
2341 }
2342 tty->cr();
2343 }
2344 }
2345
2346 void nmethod::print_recorded_metadata() {
2347 tty->print_cr("Recorded metadata:");
2348 for (int i = 0; i < metadata_count(); i++) {
2349 Metadata* m = metadata_at(i);
2350 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2351 if (m == (Metadata*)Universe::non_oop_word()) {
2352 tty->print("non-metadata word");
2353 } else {
2354 m->print_value_on_maybe_null(tty);
2355 }
2356 tty->cr();
2357 }
2358 }
2359
2360 #endif // PRODUCT
2361
2362 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2363 RelocIterator iter(this, begin, end);
2364 bool have_one = false;
2365 while (iter.next()) {
2366 have_one = true;
2367 switch (iter.type()) {
2368 case relocInfo::none: return "no_reloc";
2369 case relocInfo::oop_type: {
2370 stringStream st;
2371 oop_Relocation* r = iter.oop_reloc();
2372 oop obj = r->oop_value();
2373 st.print("oop(");
2374 if (obj == NULL) st.print("NULL");
2375 else obj->print_value_on(&st);
2376 st.print(")");
2377 return st.as_string();
2378 }
2379 case relocInfo::metadata_type: {
2380 stringStream st;
2381 metadata_Relocation* r = iter.metadata_reloc();
2382 Metadata* obj = r->metadata_value();
2383 st.print("metadata(");
2384 if (obj == NULL) st.print("NULL");
2385 else obj->print_value_on(&st);
2386 st.print(")");
2387 return st.as_string();
2388 }
2389 case relocInfo::runtime_call_type:
2390 case relocInfo::runtime_call_w_cp_type: {
2391 stringStream st;
2392 st.print("runtime_call");
2393 CallRelocation* r = (CallRelocation*)iter.reloc();
2394 address dest = r->destination();
2395 CodeBlob* cb = CodeCache::find_blob(dest);
2396 if (cb != NULL) {
2397 st.print(" %s", cb->name());
2398 } else {
2399 ResourceMark rm;
2400 const int buflen = 1024;
2401 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2402 int offset;
2403 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2404 st.print(" %s", buf);
2405 if (offset != 0) {
2406 st.print("+%d", offset);
2407 }
2408 }
2409 }
2410 return st.as_string();
2411 }
2412 case relocInfo::virtual_call_type: {
2413 stringStream st;
2414 st.print_raw("virtual_call");
2415 virtual_call_Relocation* r = iter.virtual_call_reloc();
2416 Method* m = r->method_value();
2417 if (m != NULL) {
2418 assert(m->is_method(), "");
2419 m->print_short_name(&st);
2420 }
2421 return st.as_string();
2422 }
2423 case relocInfo::opt_virtual_call_type: {
2424 stringStream st;
2425 st.print_raw("optimized virtual_call");
2426 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2427 Method* m = r->method_value();
2428 if (m != NULL) {
2429 assert(m->is_method(), "");
2430 m->print_short_name(&st);
2431 }
2432 return st.as_string();
2433 }
2434 case relocInfo::static_call_type: {
2435 stringStream st;
2436 st.print_raw("static_call");
2437 static_call_Relocation* r = iter.static_call_reloc();
2438 Method* m = r->method_value();
2439 if (m != NULL) {
2440 assert(m->is_method(), "");
2441 m->print_short_name(&st);
2442 }
2443 return st.as_string();
2444 }
2445 case relocInfo::static_stub_type: return "static_stub";
2446 case relocInfo::external_word_type: return "external_word";
2447 case relocInfo::internal_word_type: return "internal_word";
2448 case relocInfo::section_word_type: return "section_word";
2449 case relocInfo::poll_type: return "poll";
2450 case relocInfo::poll_return_type: return "poll_return";
2451 case relocInfo::type_mask: return "type_bit_mask";
2452
2453 default:
2454 break;
2455 }
2456 }
2457 return have_one ? "other" : NULL;
2458 }
2459
2460 // Return a the last scope in (begin..end]
2461 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2462 PcDesc* p = pc_desc_near(begin+1);
2463 if (p != NULL && p->real_pc(this) <= end) {
2464 return new ScopeDesc(this, p->scope_decode_offset(),
2465 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2466 p->return_oop());
2467 }
2468 return NULL;
2469 }
2470
2471 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2472 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2473 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2474 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2475 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2476 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2477
2478 if (has_method_handle_invokes())
2479 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2480
2481 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2482
2483 if (block_begin == entry_point()) {
2484 methodHandle m = method();
2485 if (m.not_null()) {
2486 stream->print(" # ");
2487 m->print_value_on(stream);
2488 stream->cr();
2489 }
2490 if (m.not_null() && !is_osr_method()) {
2491 ResourceMark rm;
2492 int sizeargs = m->size_of_parameters();
2493 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2494 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2495 {
2496 int sig_index = 0;
2497 if (!m->is_static())
2498 sig_bt[sig_index++] = T_OBJECT; // 'this'
2499 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2500 BasicType t = ss.type();
2501 sig_bt[sig_index++] = t;
2502 if (type2size[t] == 2) {
2503 sig_bt[sig_index++] = T_VOID;
2504 } else {
2505 assert(type2size[t] == 1, "size is 1 or 2");
2506 }
2507 }
2508 assert(sig_index == sizeargs, "");
2509 }
2510 const char* spname = "sp"; // make arch-specific?
2511 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2512 int stack_slot_offset = this->frame_size() * wordSize;
2513 int tab1 = 14, tab2 = 24;
2514 int sig_index = 0;
2515 int arg_index = (m->is_static() ? 0 : -1);
2516 bool did_old_sp = false;
2517 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2518 bool at_this = (arg_index == -1);
2519 bool at_old_sp = false;
2520 BasicType t = (at_this ? T_OBJECT : ss.type());
2521 assert(t == sig_bt[sig_index], "sigs in sync");
2522 if (at_this)
2523 stream->print(" # this: ");
2524 else
2525 stream->print(" # parm%d: ", arg_index);
2526 stream->move_to(tab1);
2527 VMReg fst = regs[sig_index].first();
2528 VMReg snd = regs[sig_index].second();
2529 if (fst->is_reg()) {
2530 stream->print("%s", fst->name());
2531 if (snd->is_valid()) {
2532 stream->print(":%s", snd->name());
2533 }
2534 } else if (fst->is_stack()) {
2535 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2536 if (offset == stack_slot_offset) at_old_sp = true;
2537 stream->print("[%s+0x%x]", spname, offset);
2538 } else {
2539 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2540 }
2541 stream->print(" ");
2542 stream->move_to(tab2);
2543 stream->print("= ");
2544 if (at_this) {
2545 m->method_holder()->print_value_on(stream);
2546 } else {
2547 bool did_name = false;
2548 if (!at_this && ss.is_object()) {
2549 Symbol* name = ss.as_symbol_or_null();
2550 if (name != NULL) {
2551 name->print_value_on(stream);
2552 did_name = true;
2553 }
2554 }
2555 if (!did_name)
2556 stream->print("%s", type2name(t));
2557 }
2558 if (at_old_sp) {
2559 stream->print(" (%s of caller)", spname);
2560 did_old_sp = true;
2561 }
2562 stream->cr();
2563 sig_index += type2size[t];
2564 arg_index += 1;
2565 if (!at_this) ss.next();
2566 }
2567 if (!did_old_sp) {
2568 stream->print(" # ");
2569 stream->move_to(tab1);
2570 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2571 stream->print(" (%s of caller)", spname);
2572 stream->cr();
2573 }
2574 }
2575 }
2576 }
2577
2578 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2579 // First, find an oopmap in (begin, end].
2580 // We use the odd half-closed interval so that oop maps and scope descs
2581 // which are tied to the byte after a call are printed with the call itself.
2582 address base = code_begin();
2583 ImmutableOopMapSet* oms = oop_maps();
2584 if (oms != NULL) {
2585 for (int i = 0, imax = oms->count(); i < imax; i++) {
2586 const ImmutableOopMapPair* pair = oms->pair_at(i);
2587 const ImmutableOopMap* om = pair->get_from(oms);
2588 address pc = base + pair->pc_offset();
2589 if (pc > begin) {
2590 if (pc <= end) {
2591 st->move_to(column);
2592 st->print("; ");
2593 om->print_on(st);
2594 }
2595 break;
2596 }
2597 }
2598 }
2599
2600 // Print any debug info present at this pc.
2601 ScopeDesc* sd = scope_desc_in(begin, end);
2602 if (sd != NULL) {
2603 st->move_to(column);
2604 if (sd->bci() == SynchronizationEntryBCI) {
2605 st->print(";*synchronization entry");
2606 } else {
2607 if (sd->method() == NULL) {
2608 st->print("method is NULL");
2609 } else if (sd->method()->is_native()) {
2610 st->print("method is native");
2611 } else {
2612 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2613 st->print(";*%s", Bytecodes::name(bc));
2614 switch (bc) {
2615 case Bytecodes::_invokevirtual:
2616 case Bytecodes::_invokespecial:
2617 case Bytecodes::_invokestatic:
2618 case Bytecodes::_invokeinterface:
2619 {
2620 Bytecode_invoke invoke(sd->method(), sd->bci());
2621 st->print(" ");
2622 if (invoke.name() != NULL)
2623 invoke.name()->print_symbol_on(st);
2624 else
2625 st->print("<UNKNOWN>");
2626 break;
2627 }
2628 case Bytecodes::_getfield:
2629 case Bytecodes::_putfield:
2630 case Bytecodes::_getstatic:
2631 case Bytecodes::_putstatic:
2632 {
2633 Bytecode_field field(sd->method(), sd->bci());
2634 st->print(" ");
2635 if (field.name() != NULL)
2636 field.name()->print_symbol_on(st);
2637 else
2638 st->print("<UNKNOWN>");
2639 }
2640 default:
2641 break;
2642 }
2643 }
2644 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2645 }
2646
2647 // Print all scopes
2648 for (;sd != NULL; sd = sd->sender()) {
2649 st->move_to(column);
2650 st->print("; -");
2651 if (sd->method() == NULL) {
2652 st->print("method is NULL");
2653 } else {
2654 sd->method()->print_short_name(st);
2655 }
2656 int lineno = sd->method()->line_number_from_bci(sd->bci());
2657 if (lineno != -1) {
2658 st->print("@%d (line %d)", sd->bci(), lineno);
2659 } else {
2660 st->print("@%d", sd->bci());
2661 }
2662 st->cr();
2663 }
2664 }
2665
2666 // Print relocation information
2667 const char* str = reloc_string_for(begin, end);
2668 if (str != NULL) {
2669 if (sd != NULL) st->cr();
2670 st->move_to(column);
2671 st->print("; {%s}", str);
2672 }
2673 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2674 if (cont_offset != 0) {
2675 st->move_to(column);
2676 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2677 }
2678
2679 }
2680
2681 class DirectNativeCallWrapper: public NativeCallWrapper {
2682 private:
2683 NativeCall* _call;
2684
2685 public:
2686 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2687
2688 virtual address destination() const { return _call->destination(); }
2689 virtual address instruction_address() const { return _call->instruction_address(); }
2690 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2691 virtual address return_address() const { return _call->return_address(); }
2692
2693 virtual address get_resolve_call_stub(bool is_optimized) const {
2694 if (is_optimized) {
2695 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2696 }
2697 return SharedRuntime::get_resolve_virtual_call_stub();
2698 }
2699
2700 virtual void set_destination_mt_safe(address dest) {
2701 #if INCLUDE_AOT
2702 if (UseAOT) {
2703 CodeBlob* callee = CodeCache::find_blob(dest);
2704 CompiledMethod* cm = callee->as_compiled_method_or_null();
2705 if (cm != NULL && cm->is_far_code()) {
2706 // Temporary fix, see JDK-8143106
2707 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2708 csc->set_to_far(methodHandle(cm->method()), dest);
2709 return;
2710 }
2711 }
2712 #endif
2713 _call->set_destination_mt_safe(dest);
2714 }
2715
2716 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2717 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2718 #if INCLUDE_AOT
2719 if (info.to_aot()) {
2720 csc->set_to_far(method, info.entry());
2721 } else
2722 #endif
2723 {
2724 csc->set_to_interpreted(method, info.entry());
2725 }
2726 }
2727
2728 virtual void verify() const {
2729 // make sure code pattern is actually a call imm32 instruction
2730 _call->verify();
2731 if (os::is_MP()) {
2732 _call->verify_alignment();
2733 }
2734 }
2735
2736 virtual void verify_resolve_call(address dest) const {
2737 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2738 assert(!db->is_adapter_blob(), "must use stub!");
2739 }
2740
2741 virtual bool is_call_to_interpreted(address dest) const {
2742 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2743 return cb->contains(dest);
2744 }
2745
2746 virtual bool is_safe_for_patching() const { return false; }
2747
2748 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2749 return nativeMovConstReg_at(r->cached_value());
2750 }
2751
2752 virtual void *get_data(NativeInstruction* instruction) const {
2753 return (void*)((NativeMovConstReg*) instruction)->data();
2754 }
2755
2756 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2757 ((NativeMovConstReg*) instruction)->set_data(data);
2758 }
2759 };
2760
2761 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2762 return new DirectNativeCallWrapper((NativeCall*) call);
2763 }
2764
2765 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2766 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2767 }
2768
2769 address nmethod::call_instruction_address(address pc) const {
2770 if (NativeCall::is_call_before(pc)) {
2771 NativeCall *ncall = nativeCall_before(pc);
2772 return ncall->instruction_address();
2773 }
2774 return NULL;
2775 }
2776
2777 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2778 return CompiledDirectStaticCall::at(call_site);
2779 }
2780
2781 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2782 return CompiledDirectStaticCall::at(call_site);
2783 }
2784
2785 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2786 return CompiledDirectStaticCall::before(return_addr);
2787 }
2788
2789 #ifndef PRODUCT
2790
2791 void nmethod::print_value_on(outputStream* st) const {
2792 st->print("nmethod");
2793 print_on(st, NULL);
2794 }
2795
2796 void nmethod::print_calls(outputStream* st) {
2797 RelocIterator iter(this);
2798 while (iter.next()) {
2799 switch (iter.type()) {
2800 case relocInfo::virtual_call_type:
2801 case relocInfo::opt_virtual_call_type: {
2802 VerifyMutexLocker mc(CompiledIC_lock);
2803 CompiledIC_at(&iter)->print();
2804 break;
2805 }
2806 case relocInfo::static_call_type:
2807 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2808 CompiledDirectStaticCall::at(iter.reloc())->print();
2809 break;
2810 default:
2811 break;
2812 }
2813 }
2814 }
2815
2816 void nmethod::print_handler_table() {
2817 ExceptionHandlerTable(this).print();
2818 }
2819
2820 void nmethod::print_nul_chk_table() {
2821 ImplicitExceptionTable(this).print(code_begin());
2822 }
2823
2824 void nmethod::print_statistics() {
2825 ttyLocker ttyl;
2826 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2827 native_nmethod_stats.print_native_nmethod_stats();
2828 #ifdef COMPILER1
2829 c1_java_nmethod_stats.print_nmethod_stats("C1");
2830 #endif
2831 #ifdef COMPILER2
2832 c2_java_nmethod_stats.print_nmethod_stats("C2");
2833 #endif
2834 #if INCLUDE_JVMCI
2835 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2836 #endif
2837 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2838 DebugInformationRecorder::print_statistics();
2839 #ifndef PRODUCT
2840 pc_nmethod_stats.print_pc_stats();
2841 #endif
2842 Dependencies::print_statistics();
2843 if (xtty != NULL) xtty->tail("statistics");
2844 }
2845
2846 #endif // !PRODUCT
2847
2848 #if INCLUDE_JVMCI
2849 void nmethod::clear_jvmci_installed_code() {
2850 assert_locked_or_safepoint(Patching_lock);
2851 if (_jvmci_installed_code != NULL) {
2852 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2853 _jvmci_installed_code = NULL;
2854 }
2855 }
2856
2857 void nmethod::clear_speculation_log() {
2858 assert_locked_or_safepoint(Patching_lock);
2859 if (_speculation_log != NULL) {
2860 JNIHandles::destroy_weak_global(_speculation_log);
2861 _speculation_log = NULL;
2862 }
2863 }
2864
2865 void nmethod::maybe_invalidate_installed_code() {
2866 assert(Patching_lock->is_locked() ||
2867 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2868 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2869 if (installed_code != NULL) {
2870 // Update the values in the InstalledCode instance if it still refers to this nmethod
2871 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2872 if (nm == this) {
2873 if (!is_alive()) {
2874 // Break the link between nmethod and InstalledCode such that the nmethod
2875 // can subsequently be flushed safely. The link must be maintained while
2876 // the method could have live activations since invalidateInstalledCode
2877 // might want to invalidate all existing activations.
2878 InstalledCode::set_address(installed_code, 0);
2879 InstalledCode::set_entryPoint(installed_code, 0);
2880 } else if (is_not_entrant()) {
2881 // Remove the entry point so any invocation will fail but keep
2882 // the address link around that so that existing activations can
2883 // be invalidated.
2884 InstalledCode::set_entryPoint(installed_code, 0);
2885 }
2886 }
2887 }
2888 if (!is_alive()) {
2889 // Clear these out after the nmethod has been unregistered and any
2890 // updates to the InstalledCode instance have been performed.
2891 clear_jvmci_installed_code();
2892 clear_speculation_log();
2893 }
2894 }
2895
2896 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2897 if (installedCode() == NULL) {
2898 THROW(vmSymbols::java_lang_NullPointerException());
2899 }
2900 jlong nativeMethod = InstalledCode::address(installedCode);
2901 nmethod* nm = (nmethod*)nativeMethod;
2902 if (nm == NULL) {
2903 // Nothing to do
2904 return;
2905 }
2906
2907 nmethodLocker nml(nm);
2908 #ifdef ASSERT
2909 {
2910 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2911 // This relationship can only be checked safely under a lock
2912 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2913 }
2914 #endif
2915
2916 if (nm->is_alive()) {
2917 // Invalidating the InstalledCode means we want the nmethod
2918 // to be deoptimized.
2919 nm->mark_for_deoptimization();
2920 VM_Deoptimize op;
2921 VMThread::execute(&op);
2922 }
2923
2924 // Multiple threads could reach this point so we now need to
2925 // lock and re-check the link to the nmethod so that only one
2926 // thread clears it.
2927 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2928 if (InstalledCode::address(installedCode) == nativeMethod) {
2929 InstalledCode::set_address(installedCode, 0);
2930 }
2931 }
2932
2933 oop nmethod::jvmci_installed_code() {
2934 return JNIHandles::resolve(_jvmci_installed_code);
2935 }
2936
2937 oop nmethod::speculation_log() {
2938 return JNIHandles::resolve(_speculation_log);
2939 }
2940
2941 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2942 if (!this->is_compiled_by_jvmci()) {
2943 return NULL;
2944 }
2945 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2946 if (installed_code != NULL) {
2947 oop installed_code_name = NULL;
2948 if (installed_code->is_a(InstalledCode::klass())) {
2949 installed_code_name = InstalledCode::name(installed_code);
2950 }
2951 if (installed_code_name != NULL) {
2952 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
2953 }
2954 }
2955 return NULL;
2956 }
2957 #endif