1 /*
2 * Copyright (c) 2000, 2025, 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 "cds/cdsConfig.hpp"
26 #include "ci/ciMethodData.hpp"
27 #include "classfile/systemDictionaryShared.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compilationPolicy.hpp"
30 #include "compiler/compilerDefinitions.inline.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/bytecode.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/metaspaceClosure.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "oops/method.inline.hpp"
39 #include "oops/methodData.inline.hpp"
40 #include "prims/jvmtiRedefineClasses.hpp"
41 #include "runtime/atomic.hpp"
42 #include "runtime/deoptimization.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/orderAccess.hpp"
45 #include "runtime/safepointVerifiers.hpp"
46 #include "runtime/signature.hpp"
47 #include "utilities/align.hpp"
48 #include "utilities/checkedCast.hpp"
49 #include "utilities/copy.hpp"
50
51 // ==================================================================
52 // DataLayout
53 //
54 // Overlay for generic profiling data.
55
56 // Some types of data layouts need a length field.
57 bool DataLayout::needs_array_len(u1 tag) {
58 return (tag == multi_branch_data_tag) || (tag == arg_info_data_tag) || (tag == parameters_type_data_tag);
59 }
60
61 // Perform generic initialization of the data. More specific
62 // initialization occurs in overrides of ProfileData::post_initialize.
63 void DataLayout::initialize(u1 tag, u2 bci, int cell_count) {
64 DataLayout temp;
65 temp._header._bits = (intptr_t)0;
66 temp._header._struct._tag = tag;
67 temp._header._struct._bci = bci;
68 // Write the header using a single intptr_t write. This ensures that if the layout is
69 // reinitialized readers will never see the transient state where the header is 0.
70 _header = temp._header;
71
72 for (int i = 0; i < cell_count; i++) {
73 set_cell_at(i, (intptr_t)0);
74 }
75 if (needs_array_len(tag)) {
76 set_cell_at(ArrayData::array_len_off_set, cell_count - 1); // -1 for header.
77 }
78 if (tag == call_type_data_tag) {
79 CallTypeData::initialize(this, cell_count);
80 } else if (tag == virtual_call_type_data_tag) {
81 VirtualCallTypeData::initialize(this, cell_count);
82 }
83 }
84
85 void DataLayout::clean_weak_klass_links(bool always_clean) {
86 ResourceMark m;
87 data_in()->clean_weak_klass_links(always_clean);
88 }
89
90
91 // ==================================================================
92 // ProfileData
93 //
94 // A ProfileData object is created to refer to a section of profiling
95 // data in a structured way.
96
97 // Constructor for invalid ProfileData.
98 ProfileData::ProfileData() {
99 _data = nullptr;
100 }
101
102 char* ProfileData::print_data_on_helper(const MethodData* md) const {
103 DataLayout* dp = md->extra_data_base();
104 DataLayout* end = md->args_data_limit();
105 stringStream ss;
106 for (;; dp = MethodData::next_extra(dp)) {
107 assert(dp < end, "moved past end of extra data");
108 switch(dp->tag()) {
109 case DataLayout::speculative_trap_data_tag:
110 if (dp->bci() == bci()) {
111 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
112 int trap = data->trap_state();
113 char buf[100];
114 ss.print("trap/");
115 data->method()->print_short_name(&ss);
116 ss.print("(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
117 }
118 break;
119 case DataLayout::bit_data_tag:
120 break;
121 case DataLayout::no_tag:
122 case DataLayout::arg_info_data_tag:
123 return ss.as_string();
124 break;
125 default:
126 fatal("unexpected tag %d", dp->tag());
127 }
128 }
129 return nullptr;
130 }
131
132 void ProfileData::print_data_on(outputStream* st, const MethodData* md) const {
133 print_data_on(st, print_data_on_helper(md));
134 }
135
136 void ProfileData::print_shared(outputStream* st, const char* name, const char* extra) const {
137 st->print("bci: %d ", bci());
138 st->fill_to(tab_width_one + 1);
139 st->print("%s", name);
140 tab(st);
141 int trap = trap_state();
142 if (trap != 0) {
143 char buf[100];
144 st->print("trap(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
145 }
146 if (extra != nullptr) {
147 st->print("%s", extra);
148 }
149 int flags = data()->flags();
150 if (flags != 0) {
151 st->print("flags(%d) ", flags);
152 }
153 }
154
155 void ProfileData::tab(outputStream* st, bool first) const {
156 st->fill_to(first ? tab_width_one : tab_width_two);
157 }
158
159 // ==================================================================
160 // BitData
161 //
162 // A BitData corresponds to a one-bit flag. This is used to indicate
163 // whether a checkcast bytecode has seen a null value.
164
165
166 void BitData::print_data_on(outputStream* st, const char* extra) const {
167 print_shared(st, "BitData", extra);
168 st->cr();
169 }
170
171 // ==================================================================
172 // CounterData
173 //
174 // A CounterData corresponds to a simple counter.
175
176 void CounterData::print_data_on(outputStream* st, const char* extra) const {
177 print_shared(st, "CounterData", extra);
178 st->print_cr("count(%u)", count());
179 }
180
181 // ==================================================================
182 // JumpData
183 //
184 // A JumpData is used to access profiling information for a direct
185 // branch. It is a counter, used for counting the number of branches,
186 // plus a data displacement, used for realigning the data pointer to
187 // the corresponding target bci.
188
189 void JumpData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
190 assert(stream->bci() == bci(), "wrong pos");
191 int target;
192 Bytecodes::Code c = stream->code();
193 if (c == Bytecodes::_goto_w || c == Bytecodes::_jsr_w) {
194 target = stream->dest_w();
195 } else {
196 target = stream->dest();
197 }
198 int my_di = mdo->dp_to_di(dp());
199 int target_di = mdo->bci_to_di(target);
200 int offset = target_di - my_di;
201 set_displacement(offset);
202 }
203
204 void JumpData::print_data_on(outputStream* st, const char* extra) const {
205 print_shared(st, "JumpData", extra);
206 st->print_cr("taken(%u) displacement(%d)", taken(), displacement());
207 }
208
209 int TypeStackSlotEntries::compute_cell_count(Symbol* signature, bool include_receiver, int max) {
210 // Parameter profiling include the receiver
211 int args_count = include_receiver ? 1 : 0;
212 ResourceMark rm;
213 ReferenceArgumentCount rac(signature);
214 args_count += rac.count();
215 args_count = MIN2(args_count, max);
216 return args_count * per_arg_cell_count;
217 }
218
219 int TypeEntriesAtCall::compute_cell_count(BytecodeStream* stream) {
220 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
221 assert(TypeStackSlotEntries::per_arg_count() > ReturnTypeEntry::static_cell_count(), "code to test for arguments/results broken");
222 const methodHandle m = stream->method();
223 int bci = stream->bci();
224 Bytecode_invoke inv(m, bci);
225 int args_cell = 0;
226 if (MethodData::profile_arguments_for_invoke(m, bci)) {
227 args_cell = TypeStackSlotEntries::compute_cell_count(inv.signature(), false, TypeProfileArgsLimit);
228 }
229 int ret_cell = 0;
230 if (MethodData::profile_return_for_invoke(m, bci) && is_reference_type(inv.result_type())) {
231 ret_cell = ReturnTypeEntry::static_cell_count();
232 }
233 int header_cell = 0;
234 if (args_cell + ret_cell > 0) {
235 header_cell = header_cell_count();
236 }
237
238 return header_cell + args_cell + ret_cell;
239 }
240
241 class ArgumentOffsetComputer : public SignatureIterator {
242 private:
243 int _max;
244 int _offset;
245 GrowableArray<int> _offsets;
246
247 friend class SignatureIterator; // so do_parameters_on can call do_type
248 void do_type(BasicType type) {
249 if (is_reference_type(type) && _offsets.length() < _max) {
250 _offsets.push(_offset);
251 }
252 _offset += parameter_type_word_count(type);
253 }
254
255 public:
256 ArgumentOffsetComputer(Symbol* signature, int max)
257 : SignatureIterator(signature),
258 _max(max), _offset(0),
259 _offsets(max) {
260 do_parameters_on(this); // non-virtual template execution
261 }
262
263 int off_at(int i) const { return _offsets.at(i); }
264 };
265
266 void TypeStackSlotEntries::post_initialize(Symbol* signature, bool has_receiver, bool include_receiver) {
267 ResourceMark rm;
268 int start = 0;
269 // Parameter profiling include the receiver
270 if (include_receiver && has_receiver) {
271 set_stack_slot(0, 0);
272 set_type(0, type_none());
273 start += 1;
274 }
275 ArgumentOffsetComputer aos(signature, _number_of_entries-start);
276 for (int i = start; i < _number_of_entries; i++) {
277 set_stack_slot(i, aos.off_at(i-start) + (has_receiver ? 1 : 0));
278 set_type(i, type_none());
279 }
280 }
281
282 void CallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
283 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
284 Bytecode_invoke inv(stream->method(), stream->bci());
285
286 if (has_arguments()) {
287 #ifdef ASSERT
288 ResourceMark rm;
289 ReferenceArgumentCount rac(inv.signature());
290 int count = MIN2(rac.count(), (int)TypeProfileArgsLimit);
291 assert(count > 0, "room for args type but none found?");
292 check_number_of_arguments(count);
293 #endif
294 _args.post_initialize(inv.signature(), inv.has_receiver(), false);
295 }
296
297 if (has_return()) {
298 assert(is_reference_type(inv.result_type()), "room for a ret type but doesn't return obj?");
299 _ret.post_initialize();
300 }
301 }
302
303 void VirtualCallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
304 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
305 Bytecode_invoke inv(stream->method(), stream->bci());
306
307 if (has_arguments()) {
308 #ifdef ASSERT
309 ResourceMark rm;
310 ReferenceArgumentCount rac(inv.signature());
311 int count = MIN2(rac.count(), (int)TypeProfileArgsLimit);
312 assert(count > 0, "room for args type but none found?");
313 check_number_of_arguments(count);
314 #endif
315 _args.post_initialize(inv.signature(), inv.has_receiver(), false);
316 }
317
318 if (has_return()) {
319 assert(is_reference_type(inv.result_type()), "room for a ret type but doesn't return obj?");
320 _ret.post_initialize();
321 }
322 }
323
324 static bool is_excluded(Klass* k) {
325 #if INCLUDE_CDS
326 if (SafepointSynchronize::is_at_safepoint() &&
327 CDSConfig::is_dumping_archive() &&
328 CDSConfig::current_thread_is_vm_or_dumper()) {
329 if (k->is_instance_klass() && !InstanceKlass::cast(k)->is_loaded()) {
330 log_debug(aot, training)("Purged %s from MDO: unloaded class", k->name()->as_C_string());
331 return true;
332 } else {
333 bool excluded = SystemDictionaryShared::should_be_excluded(k);
334 if (excluded) {
335 log_debug(aot, training)("Purged %s from MDO: excluded class", k->name()->as_C_string());
336 }
337 return excluded;
338 }
339 }
340 #endif
341 return false;
342 }
343
344 void TypeStackSlotEntries::clean_weak_klass_links(bool always_clean) {
345 for (int i = 0; i < _number_of_entries; i++) {
346 intptr_t p = type(i);
347 Klass* k = (Klass*)klass_part(p);
348 if (k != nullptr) {
349 if (!always_clean && k->is_instance_klass() && InstanceKlass::cast(k)->is_not_initialized()) {
350 continue; // skip not-yet-initialized classes // TODO: maybe clear the slot instead?
351 }
352 if (always_clean || !k->is_loader_present_and_alive() || is_excluded(k)) {
353 set_type(i, with_status((Klass*)nullptr, p));
354 }
355 }
356 }
357 }
358
359 void TypeStackSlotEntries::metaspace_pointers_do(MetaspaceClosure* it) {
360 for (int i = 0; i < _number_of_entries; i++) {
361 Klass** k = (Klass**)type_adr(i); // tagged
362 it->push(k);
363 }
364 }
365
366 void ReturnTypeEntry::clean_weak_klass_links(bool always_clean) {
367 intptr_t p = type();
368 Klass* k = (Klass*)klass_part(p);
369 if (k != nullptr) {
370 if (!always_clean && k->is_instance_klass() && InstanceKlass::cast(k)->is_not_initialized()) {
371 return; // skip not-yet-initialized classes // TODO: maybe clear the slot instead?
372 }
373 if (always_clean || !k->is_loader_present_and_alive() || is_excluded(k)) {
374 set_type(with_status((Klass*)nullptr, p));
375 }
376 }
377 }
378
379 void ReturnTypeEntry::metaspace_pointers_do(MetaspaceClosure* it) {
380 Klass** k = (Klass**)type_adr(); // tagged
381 it->push(k);
382 }
383
384 bool TypeEntriesAtCall::return_profiling_enabled() {
385 return MethodData::profile_return();
386 }
387
388 bool TypeEntriesAtCall::arguments_profiling_enabled() {
389 return MethodData::profile_arguments();
390 }
391
392 void TypeEntries::print_klass(outputStream* st, intptr_t k) {
393 if (is_type_none(k)) {
394 st->print("none");
395 } else if (is_type_unknown(k)) {
396 st->print("unknown");
397 } else {
398 valid_klass(k)->print_value_on(st);
399 }
400 if (was_null_seen(k)) {
401 st->print(" (null seen)");
402 }
403 }
404
405 void TypeStackSlotEntries::print_data_on(outputStream* st) const {
406 for (int i = 0; i < _number_of_entries; i++) {
407 _pd->tab(st);
408 st->print("%d: stack(%u) ", i, stack_slot(i));
409 print_klass(st, type(i));
410 st->cr();
411 }
412 }
413
414 void ReturnTypeEntry::print_data_on(outputStream* st) const {
415 _pd->tab(st);
416 print_klass(st, type());
417 st->cr();
418 }
419
420 void CallTypeData::print_data_on(outputStream* st, const char* extra) const {
421 CounterData::print_data_on(st, extra);
422 if (has_arguments()) {
423 tab(st, true);
424 st->print("argument types");
425 _args.print_data_on(st);
426 }
427 if (has_return()) {
428 tab(st, true);
429 st->print("return type");
430 _ret.print_data_on(st);
431 }
432 }
433
434 void VirtualCallTypeData::print_data_on(outputStream* st, const char* extra) const {
435 VirtualCallData::print_data_on(st, extra);
436 if (has_arguments()) {
437 tab(st, true);
438 st->print("argument types");
439 _args.print_data_on(st);
440 }
441 if (has_return()) {
442 tab(st, true);
443 st->print("return type");
444 _ret.print_data_on(st);
445 }
446 }
447
448 // ==================================================================
449 // ReceiverTypeData
450 //
451 // A ReceiverTypeData is used to access profiling information about a
452 // dynamic type check. It consists of a counter which counts the total times
453 // that the check is reached, and a series of (Klass*, count) pairs
454 // which are used to store a type profile for the receiver of the check.
455
456 void ReceiverTypeData::clean_weak_klass_links(bool always_clean) {
457 for (uint row = 0; row < row_limit(); row++) {
458 Klass* p = receiver(row);
459 if (p != nullptr) {
460 if (!always_clean && p->is_instance_klass() && InstanceKlass::cast(p)->is_not_initialized()) {
461 continue; // skip not-yet-initialized classes // TODO: maybe clear the slot instead?
462 }
463 if (always_clean || !p->is_loader_present_and_alive() || is_excluded(p)) {
464 clear_row(row);
465 }
466 }
467 }
468 }
469
470 void ReceiverTypeData::metaspace_pointers_do(MetaspaceClosure *it) {
471 for (uint row = 0; row < row_limit(); row++) {
472 Klass** recv = (Klass**)intptr_at_adr(receiver_cell_index(row));
473 it->push(recv);
474 }
475 }
476
477 void ReceiverTypeData::print_receiver_data_on(outputStream* st) const {
478 uint row;
479 int entries = 0;
480 for (row = 0; row < row_limit(); row++) {
481 if (receiver(row) != nullptr) entries++;
482 }
483 st->print_cr("count(%u) entries(%u)", count(), entries);
484 int total = count();
485 for (row = 0; row < row_limit(); row++) {
486 if (receiver(row) != nullptr) {
487 total += receiver_count(row);
488 }
489 }
490 for (row = 0; row < row_limit(); row++) {
491 if (receiver(row) != nullptr) {
492 tab(st);
493 receiver(row)->print_value_on(st);
494 st->print_cr("(%u %4.2f)", receiver_count(row), (float) receiver_count(row) / (float) total);
495 }
496 }
497 }
498 void ReceiverTypeData::print_data_on(outputStream* st, const char* extra) const {
499 print_shared(st, "ReceiverTypeData", extra);
500 print_receiver_data_on(st);
501 }
502
503 void VirtualCallData::print_data_on(outputStream* st, const char* extra) const {
504 print_shared(st, "VirtualCallData", extra);
505 print_receiver_data_on(st);
506 }
507
508 // ==================================================================
509 // RetData
510 //
511 // A RetData is used to access profiling information for a ret bytecode.
512 // It is composed of a count of the number of times that the ret has
513 // been executed, followed by a series of triples of the form
514 // (bci, count, di) which count the number of times that some bci was the
515 // target of the ret and cache a corresponding displacement.
516
517 void RetData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
518 for (uint row = 0; row < row_limit(); row++) {
519 set_bci_displacement(row, -1);
520 set_bci(row, no_bci);
521 }
522 // release so other threads see a consistent state. bci is used as
523 // a valid flag for bci_displacement.
524 OrderAccess::release();
525 }
526
527 // This routine needs to atomically update the RetData structure, so the
528 // caller needs to hold the RetData_lock before it gets here. Since taking
529 // the lock can block (and allow GC) and since RetData is a ProfileData is a
530 // wrapper around a derived oop, taking the lock in _this_ method will
531 // basically cause the 'this' pointer's _data field to contain junk after the
532 // lock. We require the caller to take the lock before making the ProfileData
533 // structure. Currently the only caller is InterpreterRuntime::update_mdp_for_ret
534 address RetData::fixup_ret(int return_bci, MethodData* h_mdo) {
535 // First find the mdp which corresponds to the return bci.
536 address mdp = h_mdo->bci_to_dp(return_bci);
537
538 // Now check to see if any of the cache slots are open.
539 for (uint row = 0; row < row_limit(); row++) {
540 if (bci(row) == no_bci) {
541 set_bci_displacement(row, checked_cast<int>(mdp - dp()));
542 set_bci_count(row, DataLayout::counter_increment);
543 // Barrier to ensure displacement is written before the bci; allows
544 // the interpreter to read displacement without fear of race condition.
545 release_set_bci(row, return_bci);
546 break;
547 }
548 }
549 return mdp;
550 }
551
552 void RetData::print_data_on(outputStream* st, const char* extra) const {
553 print_shared(st, "RetData", extra);
554 uint row;
555 int entries = 0;
556 for (row = 0; row < row_limit(); row++) {
557 if (bci(row) != no_bci) entries++;
558 }
559 st->print_cr("count(%u) entries(%u)", count(), entries);
560 for (row = 0; row < row_limit(); row++) {
561 if (bci(row) != no_bci) {
562 tab(st);
563 st->print_cr("bci(%d: count(%u) displacement(%d))",
564 bci(row), bci_count(row), bci_displacement(row));
565 }
566 }
567 }
568
569 // ==================================================================
570 // BranchData
571 //
572 // A BranchData is used to access profiling data for a two-way branch.
573 // It consists of taken and not_taken counts as well as a data displacement
574 // for the taken case.
575
576 void BranchData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
577 assert(stream->bci() == bci(), "wrong pos");
578 int target = stream->dest();
579 int my_di = mdo->dp_to_di(dp());
580 int target_di = mdo->bci_to_di(target);
581 int offset = target_di - my_di;
582 set_displacement(offset);
583 }
584
585 void BranchData::print_data_on(outputStream* st, const char* extra) const {
586 print_shared(st, "BranchData", extra);
587 st->print_cr("taken(%u) displacement(%d)",
588 taken(), displacement());
589 tab(st);
590 st->print_cr("not taken(%u)", not_taken());
591 }
592
593 // ==================================================================
594 // MultiBranchData
595 //
596 // A MultiBranchData is used to access profiling information for
597 // a multi-way branch (*switch bytecodes). It consists of a series
598 // of (count, displacement) pairs, which count the number of times each
599 // case was taken and specify the data displacement for each branch target.
600
601 int MultiBranchData::compute_cell_count(BytecodeStream* stream) {
602 int cell_count = 0;
603 if (stream->code() == Bytecodes::_tableswitch) {
604 Bytecode_tableswitch sw(stream->method()(), stream->bcp());
605 cell_count = 1 + per_case_cell_count * (1 + sw.length()); // 1 for default
606 } else {
607 Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
608 cell_count = 1 + per_case_cell_count * (sw.number_of_pairs() + 1); // 1 for default
609 }
610 return cell_count;
611 }
612
613 void MultiBranchData::post_initialize(BytecodeStream* stream,
614 MethodData* mdo) {
615 assert(stream->bci() == bci(), "wrong pos");
616 int target;
617 int my_di;
618 int target_di;
619 int offset;
620 if (stream->code() == Bytecodes::_tableswitch) {
621 Bytecode_tableswitch sw(stream->method()(), stream->bcp());
622 int len = sw.length();
623 assert(array_len() == per_case_cell_count * (len + 1), "wrong len");
624 for (int count = 0; count < len; count++) {
625 target = sw.dest_offset_at(count) + bci();
626 my_di = mdo->dp_to_di(dp());
627 target_di = mdo->bci_to_di(target);
628 offset = target_di - my_di;
629 set_displacement_at(count, offset);
630 }
631 target = sw.default_offset() + bci();
632 my_di = mdo->dp_to_di(dp());
633 target_di = mdo->bci_to_di(target);
634 offset = target_di - my_di;
635 set_default_displacement(offset);
636
637 } else {
638 Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
639 int npairs = sw.number_of_pairs();
640 assert(array_len() == per_case_cell_count * (npairs + 1), "wrong len");
641 for (int count = 0; count < npairs; count++) {
642 LookupswitchPair pair = sw.pair_at(count);
643 target = pair.offset() + bci();
644 my_di = mdo->dp_to_di(dp());
645 target_di = mdo->bci_to_di(target);
646 offset = target_di - my_di;
647 set_displacement_at(count, offset);
648 }
649 target = sw.default_offset() + bci();
650 my_di = mdo->dp_to_di(dp());
651 target_di = mdo->bci_to_di(target);
652 offset = target_di - my_di;
653 set_default_displacement(offset);
654 }
655 }
656
657 void MultiBranchData::print_data_on(outputStream* st, const char* extra) const {
658 print_shared(st, "MultiBranchData", extra);
659 st->print_cr("default_count(%u) displacement(%d)",
660 default_count(), default_displacement());
661 int cases = number_of_cases();
662 for (int i = 0; i < cases; i++) {
663 tab(st);
664 st->print_cr("count(%u) displacement(%d)",
665 count_at(i), displacement_at(i));
666 }
667 }
668
669 void ArgInfoData::print_data_on(outputStream* st, const char* extra) const {
670 print_shared(st, "ArgInfoData", extra);
671 int nargs = number_of_args();
672 for (int i = 0; i < nargs; i++) {
673 st->print(" 0x%x", arg_modified(i));
674 }
675 st->cr();
676 }
677
678 int ParametersTypeData::compute_cell_count(Method* m) {
679 if (!MethodData::profile_parameters_for_method(methodHandle(Thread::current(), m))) {
680 return 0;
681 }
682 int max = TypeProfileParmsLimit == -1 ? INT_MAX : TypeProfileParmsLimit;
683 int obj_args = TypeStackSlotEntries::compute_cell_count(m->signature(), !m->is_static(), max);
684 if (obj_args > 0) {
685 return obj_args + 1; // 1 cell for array len
686 }
687 return 0;
688 }
689
690 void ParametersTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
691 _parameters.post_initialize(mdo->method()->signature(), !mdo->method()->is_static(), true);
692 }
693
694 bool ParametersTypeData::profiling_enabled() {
695 return MethodData::profile_parameters();
696 }
697
698 void ParametersTypeData::print_data_on(outputStream* st, const char* extra) const {
699 print_shared(st, "ParametersTypeData", extra);
700 tab(st);
701 _parameters.print_data_on(st);
702 st->cr();
703 }
704
705 void SpeculativeTrapData::metaspace_pointers_do(MetaspaceClosure* it) {
706 Method** m = (Method**)intptr_at_adr(speculative_trap_method);
707 it->push(m);
708 }
709
710 void SpeculativeTrapData::print_data_on(outputStream* st, const char* extra) const {
711 print_shared(st, "SpeculativeTrapData", extra);
712 tab(st);
713 method()->print_short_name(st);
714 st->cr();
715 }
716
717 // ==================================================================
718 // MethodData*
719 //
720 // A MethodData* holds information which has been collected about
721 // a method.
722
723 MethodData* MethodData::allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS) {
724 assert(!THREAD->owns_locks(), "Should not own any locks");
725 int size = MethodData::compute_allocation_size_in_words(method);
726
727 return new (loader_data, size, MetaspaceObj::MethodDataType, THREAD)
728 MethodData(method);
729 }
730
731 int MethodData::bytecode_cell_count(Bytecodes::Code code) {
732 switch (code) {
733 case Bytecodes::_checkcast:
734 case Bytecodes::_instanceof:
735 case Bytecodes::_aastore:
736 if (TypeProfileCasts) {
737 return ReceiverTypeData::static_cell_count();
738 } else {
739 return BitData::static_cell_count();
740 }
741 case Bytecodes::_invokespecial:
742 case Bytecodes::_invokestatic:
743 if (MethodData::profile_arguments() || MethodData::profile_return()) {
744 return variable_cell_count;
745 } else {
746 return CounterData::static_cell_count();
747 }
748 case Bytecodes::_goto:
749 case Bytecodes::_goto_w:
750 case Bytecodes::_jsr:
751 case Bytecodes::_jsr_w:
752 return JumpData::static_cell_count();
753 case Bytecodes::_invokevirtual:
754 case Bytecodes::_invokeinterface:
755 if (MethodData::profile_arguments() || MethodData::profile_return()) {
756 return variable_cell_count;
757 } else {
758 return VirtualCallData::static_cell_count();
759 }
760 case Bytecodes::_invokedynamic:
761 if (MethodData::profile_arguments() || MethodData::profile_return()) {
762 return variable_cell_count;
763 } else {
764 return CounterData::static_cell_count();
765 }
766 case Bytecodes::_ret:
767 return RetData::static_cell_count();
768 case Bytecodes::_ifeq:
769 case Bytecodes::_ifne:
770 case Bytecodes::_iflt:
771 case Bytecodes::_ifge:
772 case Bytecodes::_ifgt:
773 case Bytecodes::_ifle:
774 case Bytecodes::_if_icmpeq:
775 case Bytecodes::_if_icmpne:
776 case Bytecodes::_if_icmplt:
777 case Bytecodes::_if_icmpge:
778 case Bytecodes::_if_icmpgt:
779 case Bytecodes::_if_icmple:
780 case Bytecodes::_if_acmpeq:
781 case Bytecodes::_if_acmpne:
782 case Bytecodes::_ifnull:
783 case Bytecodes::_ifnonnull:
784 return BranchData::static_cell_count();
785 case Bytecodes::_lookupswitch:
786 case Bytecodes::_tableswitch:
787 return variable_cell_count;
788 default:
789 return no_profile_data;
790 }
791 }
792
793 // Compute the size of the profiling information corresponding to
794 // the current bytecode.
795 int MethodData::compute_data_size(BytecodeStream* stream) {
796 int cell_count = bytecode_cell_count(stream->code());
797 if (cell_count == no_profile_data) {
798 return 0;
799 }
800 if (cell_count == variable_cell_count) {
801 switch (stream->code()) {
802 case Bytecodes::_lookupswitch:
803 case Bytecodes::_tableswitch:
804 cell_count = MultiBranchData::compute_cell_count(stream);
805 break;
806 case Bytecodes::_invokespecial:
807 case Bytecodes::_invokestatic:
808 case Bytecodes::_invokedynamic:
809 assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
810 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
811 profile_return_for_invoke(stream->method(), stream->bci())) {
812 cell_count = CallTypeData::compute_cell_count(stream);
813 } else {
814 cell_count = CounterData::static_cell_count();
815 }
816 break;
817 case Bytecodes::_invokevirtual:
818 case Bytecodes::_invokeinterface: {
819 assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
820 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
821 profile_return_for_invoke(stream->method(), stream->bci())) {
822 cell_count = VirtualCallTypeData::compute_cell_count(stream);
823 } else {
824 cell_count = VirtualCallData::static_cell_count();
825 }
826 break;
827 }
828 default:
829 fatal("unexpected bytecode for var length profile data");
830 }
831 }
832 // Note: cell_count might be zero, meaning that there is just
833 // a DataLayout header, with no extra cells.
834 assert(cell_count >= 0, "sanity");
835 return DataLayout::compute_size_in_bytes(cell_count);
836 }
837
838 bool MethodData::is_speculative_trap_bytecode(Bytecodes::Code code) {
839 // Bytecodes for which we may use speculation
840 switch (code) {
841 case Bytecodes::_checkcast:
842 case Bytecodes::_instanceof:
843 case Bytecodes::_aastore:
844 case Bytecodes::_invokevirtual:
845 case Bytecodes::_invokeinterface:
846 case Bytecodes::_if_acmpeq:
847 case Bytecodes::_if_acmpne:
848 case Bytecodes::_ifnull:
849 case Bytecodes::_ifnonnull:
850 case Bytecodes::_invokestatic:
851 #ifdef COMPILER2
852 if (CompilerConfig::is_c2_enabled()) {
853 return UseTypeSpeculation;
854 }
855 #endif
856 default:
857 return false;
858 }
859 return false;
860 }
861
862 #if INCLUDE_JVMCI
863
864 void* FailedSpeculation::operator new(size_t size, size_t fs_size) throw() {
865 return CHeapObj<mtCompiler>::operator new(fs_size, std::nothrow);
866 }
867
868 FailedSpeculation::FailedSpeculation(address speculation, int speculation_len) : _data_len(speculation_len), _next(nullptr) {
869 memcpy(data(), speculation, speculation_len);
870 }
871
872 // A heuristic check to detect nmethods that outlive a failed speculations list.
873 static void guarantee_failed_speculations_alive(nmethod* nm, FailedSpeculation** failed_speculations_address) {
874 jlong head = (jlong)(address) *failed_speculations_address;
875 if ((head & 0x1) == 0x1) {
876 stringStream st;
877 if (nm != nullptr) {
878 st.print("%d", nm->compile_id());
879 Method* method = nm->method();
880 st.print_raw("{");
881 if (method != nullptr) {
882 method->print_name(&st);
883 } else {
884 const char* jvmci_name = nm->jvmci_name();
885 if (jvmci_name != nullptr) {
886 st.print_raw(jvmci_name);
887 }
888 }
889 st.print_raw("}");
890 } else {
891 st.print("<unknown>");
892 }
893 fatal("Adding to failed speculations list that appears to have been freed. Source: %s", st.as_string());
894 }
895 }
896
897 bool FailedSpeculation::add_failed_speculation(nmethod* nm, FailedSpeculation** failed_speculations_address, address speculation, int speculation_len) {
898 assert(failed_speculations_address != nullptr, "must be");
899 size_t fs_size = sizeof(FailedSpeculation) + speculation_len;
900
901 guarantee_failed_speculations_alive(nm, failed_speculations_address);
902
903 FailedSpeculation** cursor = failed_speculations_address;
904 FailedSpeculation* fs = nullptr;
905 do {
906 if (*cursor == nullptr) {
907 if (fs == nullptr) {
908 // lazily allocate FailedSpeculation
909 fs = new (fs_size) FailedSpeculation(speculation, speculation_len);
910 if (fs == nullptr) {
911 // no memory -> ignore failed speculation
912 return false;
913 }
914 guarantee(is_aligned(fs, sizeof(FailedSpeculation*)), "FailedSpeculation objects must be pointer aligned");
915 }
916 FailedSpeculation* old_fs = Atomic::cmpxchg(cursor, (FailedSpeculation*) nullptr, fs);
917 if (old_fs == nullptr) {
918 // Successfully appended fs to end of the list
919 return true;
920 }
921 }
922 guarantee(*cursor != nullptr, "cursor must point to non-null FailedSpeculation");
923 // check if the current entry matches this thread's failed speculation
924 if ((*cursor)->data_len() == speculation_len && memcmp(speculation, (*cursor)->data(), speculation_len) == 0) {
925 if (fs != nullptr) {
926 delete fs;
927 }
928 return false;
929 }
930 cursor = (*cursor)->next_adr();
931 } while (true);
932 }
933
934 void FailedSpeculation::free_failed_speculations(FailedSpeculation** failed_speculations_address) {
935 assert(failed_speculations_address != nullptr, "must be");
936 FailedSpeculation* fs = *failed_speculations_address;
937 while (fs != nullptr) {
938 FailedSpeculation* next = fs->next();
939 delete fs;
940 fs = next;
941 }
942
943 // Write an unaligned value to failed_speculations_address to denote
944 // that it is no longer a valid pointer. This is allows for the check
945 // in add_failed_speculation against adding to a freed failed
946 // speculations list.
947 long* head = (long*) failed_speculations_address;
948 (*head) = (*head) | 0x1;
949 }
950 #endif // INCLUDE_JVMCI
951
952 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps) {
953 #if INCLUDE_JVMCI
954 if (ProfileTraps) {
955 // Assume that up to 30% of the possibly trapping BCIs with no MDP will need to allocate one.
956 int extra_data_count = MIN2(empty_bc_count, MAX2(4, (empty_bc_count * 30) / 100));
957
958 // Make sure we have a minimum number of extra data slots to
959 // allocate SpeculativeTrapData entries. We would want to have one
960 // entry per compilation that inlines this method and for which
961 // some type speculation assumption fails. So the room we need for
962 // the SpeculativeTrapData entries doesn't directly depend on the
963 // size of the method. Because it's hard to estimate, we reserve
964 // space for an arbitrary number of entries.
965 int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
966 (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
967
968 return MAX2(extra_data_count, spec_data_count);
969 } else {
970 return 0;
971 }
972 #else // INCLUDE_JVMCI
973 if (ProfileTraps) {
974 // Assume that up to 3% of BCIs with no MDP will need to allocate one.
975 int extra_data_count = (uint)(empty_bc_count * 3) / 128 + 1;
976 // If the method is large, let the extra BCIs grow numerous (to ~1%).
977 int one_percent_of_data
978 = (uint)data_size / (DataLayout::header_size_in_bytes()*128);
979 if (extra_data_count < one_percent_of_data)
980 extra_data_count = one_percent_of_data;
981 if (extra_data_count > empty_bc_count)
982 extra_data_count = empty_bc_count; // no need for more
983
984 // Make sure we have a minimum number of extra data slots to
985 // allocate SpeculativeTrapData entries. We would want to have one
986 // entry per compilation that inlines this method and for which
987 // some type speculation assumption fails. So the room we need for
988 // the SpeculativeTrapData entries doesn't directly depend on the
989 // size of the method. Because it's hard to estimate, we reserve
990 // space for an arbitrary number of entries.
991 int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
992 (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
993
994 return MAX2(extra_data_count, spec_data_count);
995 } else {
996 return 0;
997 }
998 #endif // INCLUDE_JVMCI
999 }
1000
1001 // Compute the size of the MethodData* necessary to store
1002 // profiling information about a given method. Size is in bytes.
1003 int MethodData::compute_allocation_size_in_bytes(const methodHandle& method) {
1004 int data_size = 0;
1005 BytecodeStream stream(method);
1006 Bytecodes::Code c;
1007 int empty_bc_count = 0; // number of bytecodes lacking data
1008 bool needs_speculative_traps = false;
1009 while ((c = stream.next()) >= 0) {
1010 int size_in_bytes = compute_data_size(&stream);
1011 data_size += size_in_bytes;
1012 if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c))) empty_bc_count += 1;
1013 needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
1014 }
1015 int object_size = in_bytes(data_offset()) + data_size;
1016
1017 // Add some extra DataLayout cells (at least one) to track stray traps.
1018 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
1019 object_size += extra_data_count * DataLayout::compute_size_in_bytes(0);
1020
1021 // Add a cell to record information about modified arguments.
1022 int arg_size = method->size_of_parameters();
1023 object_size += DataLayout::compute_size_in_bytes(arg_size+1);
1024
1025 // Reserve room for an area of the MDO dedicated to profiling of
1026 // parameters
1027 int args_cell = ParametersTypeData::compute_cell_count(method());
1028 if (args_cell > 0) {
1029 object_size += DataLayout::compute_size_in_bytes(args_cell);
1030 }
1031
1032 if (ProfileExceptionHandlers && method()->has_exception_handler()) {
1033 int num_exception_handlers = method()->exception_table_length();
1034 object_size += num_exception_handlers * single_exception_handler_data_size();
1035 }
1036
1037 return object_size;
1038 }
1039
1040 // Compute the size of the MethodData* necessary to store
1041 // profiling information about a given method. Size is in words
1042 int MethodData::compute_allocation_size_in_words(const methodHandle& method) {
1043 int byte_size = compute_allocation_size_in_bytes(method);
1044 int word_size = align_up(byte_size, BytesPerWord) / BytesPerWord;
1045 return align_metadata_size(word_size);
1046 }
1047
1048 // Initialize an individual data segment. Returns the size of
1049 // the segment in bytes.
1050 int MethodData::initialize_data(BytecodeStream* stream,
1051 int data_index) {
1052 int cell_count = -1;
1053 u1 tag = DataLayout::no_tag;
1054 DataLayout* data_layout = data_layout_at(data_index);
1055 Bytecodes::Code c = stream->code();
1056 switch (c) {
1057 case Bytecodes::_checkcast:
1058 case Bytecodes::_instanceof:
1059 case Bytecodes::_aastore:
1060 if (TypeProfileCasts) {
1061 cell_count = ReceiverTypeData::static_cell_count();
1062 tag = DataLayout::receiver_type_data_tag;
1063 } else {
1064 cell_count = BitData::static_cell_count();
1065 tag = DataLayout::bit_data_tag;
1066 }
1067 break;
1068 case Bytecodes::_invokespecial:
1069 case Bytecodes::_invokestatic: {
1070 int counter_data_cell_count = CounterData::static_cell_count();
1071 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
1072 profile_return_for_invoke(stream->method(), stream->bci())) {
1073 cell_count = CallTypeData::compute_cell_count(stream);
1074 } else {
1075 cell_count = counter_data_cell_count;
1076 }
1077 if (cell_count > counter_data_cell_count) {
1078 tag = DataLayout::call_type_data_tag;
1079 } else {
1080 tag = DataLayout::counter_data_tag;
1081 }
1082 break;
1083 }
1084 case Bytecodes::_goto:
1085 case Bytecodes::_goto_w:
1086 case Bytecodes::_jsr:
1087 case Bytecodes::_jsr_w:
1088 cell_count = JumpData::static_cell_count();
1089 tag = DataLayout::jump_data_tag;
1090 break;
1091 case Bytecodes::_invokevirtual:
1092 case Bytecodes::_invokeinterface: {
1093 int virtual_call_data_cell_count = VirtualCallData::static_cell_count();
1094 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
1095 profile_return_for_invoke(stream->method(), stream->bci())) {
1096 cell_count = VirtualCallTypeData::compute_cell_count(stream);
1097 } else {
1098 cell_count = virtual_call_data_cell_count;
1099 }
1100 if (cell_count > virtual_call_data_cell_count) {
1101 tag = DataLayout::virtual_call_type_data_tag;
1102 } else {
1103 tag = DataLayout::virtual_call_data_tag;
1104 }
1105 break;
1106 }
1107 case Bytecodes::_invokedynamic: {
1108 // %%% should make a type profile for any invokedynamic that takes a ref argument
1109 int counter_data_cell_count = CounterData::static_cell_count();
1110 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
1111 profile_return_for_invoke(stream->method(), stream->bci())) {
1112 cell_count = CallTypeData::compute_cell_count(stream);
1113 } else {
1114 cell_count = counter_data_cell_count;
1115 }
1116 if (cell_count > counter_data_cell_count) {
1117 tag = DataLayout::call_type_data_tag;
1118 } else {
1119 tag = DataLayout::counter_data_tag;
1120 }
1121 break;
1122 }
1123 case Bytecodes::_ret:
1124 cell_count = RetData::static_cell_count();
1125 tag = DataLayout::ret_data_tag;
1126 break;
1127 case Bytecodes::_ifeq:
1128 case Bytecodes::_ifne:
1129 case Bytecodes::_iflt:
1130 case Bytecodes::_ifge:
1131 case Bytecodes::_ifgt:
1132 case Bytecodes::_ifle:
1133 case Bytecodes::_if_icmpeq:
1134 case Bytecodes::_if_icmpne:
1135 case Bytecodes::_if_icmplt:
1136 case Bytecodes::_if_icmpge:
1137 case Bytecodes::_if_icmpgt:
1138 case Bytecodes::_if_icmple:
1139 case Bytecodes::_if_acmpeq:
1140 case Bytecodes::_if_acmpne:
1141 case Bytecodes::_ifnull:
1142 case Bytecodes::_ifnonnull:
1143 cell_count = BranchData::static_cell_count();
1144 tag = DataLayout::branch_data_tag;
1145 break;
1146 case Bytecodes::_lookupswitch:
1147 case Bytecodes::_tableswitch:
1148 cell_count = MultiBranchData::compute_cell_count(stream);
1149 tag = DataLayout::multi_branch_data_tag;
1150 break;
1151 default:
1152 break;
1153 }
1154 assert(tag == DataLayout::multi_branch_data_tag ||
1155 ((MethodData::profile_arguments() || MethodData::profile_return()) &&
1156 (tag == DataLayout::call_type_data_tag ||
1157 tag == DataLayout::counter_data_tag ||
1158 tag == DataLayout::virtual_call_type_data_tag ||
1159 tag == DataLayout::virtual_call_data_tag)) ||
1160 cell_count == bytecode_cell_count(c), "cell counts must agree");
1161 if (cell_count >= 0) {
1162 assert(tag != DataLayout::no_tag, "bad tag");
1163 assert(bytecode_has_profile(c), "agree w/ BHP");
1164 data_layout->initialize(tag, checked_cast<u2>(stream->bci()), cell_count);
1165 return DataLayout::compute_size_in_bytes(cell_count);
1166 } else {
1167 assert(!bytecode_has_profile(c), "agree w/ !BHP");
1168 return 0;
1169 }
1170 }
1171
1172 // Get the data at an arbitrary (sort of) data index.
1173 ProfileData* MethodData::data_at(int data_index) const {
1174 if (out_of_bounds(data_index)) {
1175 return nullptr;
1176 }
1177 DataLayout* data_layout = data_layout_at(data_index);
1178 return data_layout->data_in();
1179 }
1180
1181 int DataLayout::cell_count() {
1182 switch (tag()) {
1183 case DataLayout::no_tag:
1184 default:
1185 ShouldNotReachHere();
1186 return 0;
1187 case DataLayout::bit_data_tag:
1188 return BitData::static_cell_count();
1189 case DataLayout::counter_data_tag:
1190 return CounterData::static_cell_count();
1191 case DataLayout::jump_data_tag:
1192 return JumpData::static_cell_count();
1193 case DataLayout::receiver_type_data_tag:
1194 return ReceiverTypeData::static_cell_count();
1195 case DataLayout::virtual_call_data_tag:
1196 return VirtualCallData::static_cell_count();
1197 case DataLayout::ret_data_tag:
1198 return RetData::static_cell_count();
1199 case DataLayout::branch_data_tag:
1200 return BranchData::static_cell_count();
1201 case DataLayout::multi_branch_data_tag:
1202 return ((new MultiBranchData(this))->cell_count());
1203 case DataLayout::arg_info_data_tag:
1204 return ((new ArgInfoData(this))->cell_count());
1205 case DataLayout::call_type_data_tag:
1206 return ((new CallTypeData(this))->cell_count());
1207 case DataLayout::virtual_call_type_data_tag:
1208 return ((new VirtualCallTypeData(this))->cell_count());
1209 case DataLayout::parameters_type_data_tag:
1210 return ((new ParametersTypeData(this))->cell_count());
1211 case DataLayout::speculative_trap_data_tag:
1212 return SpeculativeTrapData::static_cell_count();
1213 }
1214 }
1215 ProfileData* DataLayout::data_in() {
1216 switch (tag()) {
1217 case DataLayout::no_tag:
1218 default:
1219 ShouldNotReachHere();
1220 return nullptr;
1221 case DataLayout::bit_data_tag:
1222 return new BitData(this);
1223 case DataLayout::counter_data_tag:
1224 return new CounterData(this);
1225 case DataLayout::jump_data_tag:
1226 return new JumpData(this);
1227 case DataLayout::receiver_type_data_tag:
1228 return new ReceiverTypeData(this);
1229 case DataLayout::virtual_call_data_tag:
1230 return new VirtualCallData(this);
1231 case DataLayout::ret_data_tag:
1232 return new RetData(this);
1233 case DataLayout::branch_data_tag:
1234 return new BranchData(this);
1235 case DataLayout::multi_branch_data_tag:
1236 return new MultiBranchData(this);
1237 case DataLayout::arg_info_data_tag:
1238 return new ArgInfoData(this);
1239 case DataLayout::call_type_data_tag:
1240 return new CallTypeData(this);
1241 case DataLayout::virtual_call_type_data_tag:
1242 return new VirtualCallTypeData(this);
1243 case DataLayout::parameters_type_data_tag:
1244 return new ParametersTypeData(this);
1245 case DataLayout::speculative_trap_data_tag:
1246 return new SpeculativeTrapData(this);
1247 }
1248 }
1249
1250 // Iteration over data.
1251 ProfileData* MethodData::next_data(ProfileData* current) const {
1252 int current_index = dp_to_di(current->dp());
1253 int next_index = current_index + current->size_in_bytes();
1254 ProfileData* next = data_at(next_index);
1255 return next;
1256 }
1257
1258 DataLayout* MethodData::next_data_layout(DataLayout* current) const {
1259 int current_index = dp_to_di((address)current);
1260 int next_index = current_index + current->size_in_bytes();
1261 if (out_of_bounds(next_index)) {
1262 return nullptr;
1263 }
1264 DataLayout* next = data_layout_at(next_index);
1265 return next;
1266 }
1267
1268 // Give each of the data entries a chance to perform specific
1269 // data initialization.
1270 void MethodData::post_initialize(BytecodeStream* stream) {
1271 ResourceMark rm;
1272 ProfileData* data;
1273 for (data = first_data(); is_valid(data); data = next_data(data)) {
1274 stream->set_start(data->bci());
1275 stream->next();
1276 data->post_initialize(stream, this);
1277 }
1278 if (_parameters_type_data_di != no_parameters) {
1279 parameters_type_data()->post_initialize(nullptr, this);
1280 }
1281 }
1282
1283 // Initialize the MethodData* corresponding to a given method.
1284 MethodData::MethodData(const methodHandle& method)
1285 : _method(method()),
1286 // Holds Compile_lock
1287 _compiler_counters(),
1288 _parameters_type_data_di(parameters_uninitialized) {
1289 _extra_data_lock = nullptr;
1290 initialize();
1291 }
1292
1293 #if INCLUDE_CDS
1294 MethodData::MethodData() {
1295 // Used by cppVtables.cpp only
1296 assert(CDSConfig::is_dumping_static_archive() || UseSharedSpaces, "only for CDS");
1297 }
1298 #endif
1299
1300 // Reinitialize the storage of an existing MDO at a safepoint. Doing it this way will ensure it's
1301 // not being accessed while the contents are being rewritten.
1302 class VM_ReinitializeMDO: public VM_Operation {
1303 private:
1304 MethodData* _mdo;
1305 public:
1306 VM_ReinitializeMDO(MethodData* mdo): _mdo(mdo) {}
1307 VMOp_Type type() const { return VMOp_ReinitializeMDO; }
1308 void doit() {
1309 // The extra data is being zero'd, we'd like to acquire the extra_data_lock but it can't be held
1310 // over a safepoint. This means that we don't actually need to acquire the lock.
1311 _mdo->initialize();
1312 }
1313 bool allow_nested_vm_operations() const { return true; }
1314 };
1315
1316 void MethodData::reinitialize() {
1317 VM_ReinitializeMDO op(this);
1318 VMThread::execute(&op);
1319 }
1320
1321
1322 void MethodData::initialize() {
1323 Thread* thread = Thread::current();
1324 NoSafepointVerifier no_safepoint; // init function atomic wrt GC
1325 ResourceMark rm(thread);
1326
1327 init();
1328
1329 // Go through the bytecodes and allocate and initialize the
1330 // corresponding data cells.
1331 int data_size = 0;
1332 int empty_bc_count = 0; // number of bytecodes lacking data
1333 _data[0] = 0; // apparently not set below.
1334 BytecodeStream stream(methodHandle(thread, method()));
1335 Bytecodes::Code c;
1336 bool needs_speculative_traps = false;
1337 while ((c = stream.next()) >= 0) {
1338 int size_in_bytes = initialize_data(&stream, data_size);
1339 data_size += size_in_bytes;
1340 if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c))) empty_bc_count += 1;
1341 needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
1342 }
1343 _data_size = data_size;
1344 int object_size = in_bytes(data_offset()) + data_size;
1345
1346 // Add some extra DataLayout cells (at least one) to track stray traps.
1347 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
1348 int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0);
1349
1350 // Let's zero the space for the extra data
1351 if (extra_size > 0) {
1352 Copy::zero_to_bytes(((address)_data) + data_size, extra_size);
1353 }
1354
1355 // Add a cell to record information about modified arguments.
1356 // Set up _args_modified array after traps cells so that
1357 // the code for traps cells works.
1358 DataLayout *dp = data_layout_at(data_size + extra_size);
1359
1360 int arg_size = method()->size_of_parameters();
1361 dp->initialize(DataLayout::arg_info_data_tag, 0, arg_size+1);
1362
1363 int arg_data_size = DataLayout::compute_size_in_bytes(arg_size+1);
1364 object_size += extra_size + arg_data_size;
1365
1366 int parms_cell = ParametersTypeData::compute_cell_count(method());
1367 // If we are profiling parameters, we reserved an area near the end
1368 // of the MDO after the slots for bytecodes (because there's no bci
1369 // for method entry so they don't fit with the framework for the
1370 // profiling of bytecodes). We store the offset within the MDO of
1371 // this area (or -1 if no parameter is profiled)
1372 int parm_data_size = 0;
1373 if (parms_cell > 0) {
1374 parm_data_size = DataLayout::compute_size_in_bytes(parms_cell);
1375 object_size += parm_data_size;
1376 _parameters_type_data_di = data_size + extra_size + arg_data_size;
1377 DataLayout *dp = data_layout_at(data_size + extra_size + arg_data_size);
1378 dp->initialize(DataLayout::parameters_type_data_tag, 0, parms_cell);
1379 } else {
1380 _parameters_type_data_di = no_parameters;
1381 }
1382
1383 _exception_handler_data_di = data_size + extra_size + arg_data_size + parm_data_size;
1384 if (ProfileExceptionHandlers && method()->has_exception_handler()) {
1385 int num_exception_handlers = method()->exception_table_length();
1386 object_size += num_exception_handlers * single_exception_handler_data_size();
1387 ExceptionTableElement* exception_handlers = method()->exception_table_start();
1388 for (int i = 0; i < num_exception_handlers; i++) {
1389 DataLayout *dp = exception_handler_data_at(i);
1390 dp->initialize(DataLayout::bit_data_tag, exception_handlers[i].handler_pc, single_exception_handler_data_cell_count());
1391 }
1392 }
1393
1394 // Set an initial hint. Don't use set_hint_di() because
1395 // first_di() may be out of bounds if data_size is 0.
1396 // In that situation, _hint_di is never used, but at
1397 // least well-defined.
1398 _hint_di = first_di();
1399
1400 post_initialize(&stream);
1401
1402 assert(object_size == compute_allocation_size_in_bytes(methodHandle(thread, _method)), "MethodData: computed size != initialized size");
1403 set_size(object_size);
1404 }
1405
1406 void MethodData::init() {
1407 _compiler_counters = CompilerCounters(); // reset compiler counters
1408 _invocation_counter.init();
1409 _backedge_counter.init();
1410 _invocation_counter_start = 0;
1411 _backedge_counter_start = 0;
1412
1413 // Set per-method invoke- and backedge mask.
1414 double scale = 1.0;
1415 methodHandle mh(Thread::current(), _method);
1416 CompilerOracle::has_option_value(mh, CompileCommandEnum::CompileThresholdScaling, scale);
1417 _invoke_mask = (int)right_n_bits(CompilerConfig::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1418 _backedge_mask = (int)right_n_bits(CompilerConfig::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1419
1420 _tenure_traps = 0;
1421 _num_loops = 0;
1422 _num_blocks = 0;
1423 _would_profile = unknown;
1424
1425 #if INCLUDE_JVMCI
1426 _jvmci_ir_size = 0;
1427 _failed_speculations = nullptr;
1428 #endif
1429
1430 // Initialize escape flags.
1431 clear_escape_info();
1432 }
1433
1434 bool MethodData::is_mature() const {
1435 return CompilationPolicy::is_mature(const_cast<MethodData*>(this));
1436 }
1437
1438 // Translate a bci to its corresponding data index (di).
1439 address MethodData::bci_to_dp(int bci) {
1440 ResourceMark rm;
1441 DataLayout* data = data_layout_before(bci);
1442 DataLayout* prev = nullptr;
1443 for ( ; is_valid(data); data = next_data_layout(data)) {
1444 if (data->bci() >= bci) {
1445 if (data->bci() == bci) set_hint_di(dp_to_di((address)data));
1446 else if (prev != nullptr) set_hint_di(dp_to_di((address)prev));
1447 return (address)data;
1448 }
1449 prev = data;
1450 }
1451 return (address)limit_data_position();
1452 }
1453
1454 // Translate a bci to its corresponding data, or null.
1455 ProfileData* MethodData::bci_to_data(int bci) {
1456 check_extra_data_locked();
1457
1458 DataLayout* data = data_layout_before(bci);
1459 for ( ; is_valid(data); data = next_data_layout(data)) {
1460 if (data->bci() == bci) {
1461 set_hint_di(dp_to_di((address)data));
1462 return data->data_in();
1463 } else if (data->bci() > bci) {
1464 break;
1465 }
1466 }
1467 return bci_to_extra_data(bci, nullptr, false);
1468 }
1469
1470 DataLayout* MethodData::exception_handler_bci_to_data_helper(int bci) {
1471 assert(ProfileExceptionHandlers, "not profiling");
1472 for (int i = 0; i < num_exception_handler_data(); i++) {
1473 DataLayout* exception_handler_data = exception_handler_data_at(i);
1474 if (exception_handler_data->bci() == bci) {
1475 return exception_handler_data;
1476 }
1477 }
1478 return nullptr;
1479 }
1480
1481 BitData* MethodData::exception_handler_bci_to_data_or_null(int bci) {
1482 DataLayout* data = exception_handler_bci_to_data_helper(bci);
1483 return data != nullptr ? new BitData(data) : nullptr;
1484 }
1485
1486 BitData MethodData::exception_handler_bci_to_data(int bci) {
1487 DataLayout* data = exception_handler_bci_to_data_helper(bci);
1488 assert(data != nullptr, "invalid bci");
1489 return BitData(data);
1490 }
1491
1492 DataLayout* MethodData::next_extra(DataLayout* dp) {
1493 int nb_cells = 0;
1494 switch(dp->tag()) {
1495 case DataLayout::bit_data_tag:
1496 case DataLayout::no_tag:
1497 nb_cells = BitData::static_cell_count();
1498 break;
1499 case DataLayout::speculative_trap_data_tag:
1500 nb_cells = SpeculativeTrapData::static_cell_count();
1501 break;
1502 default:
1503 fatal("unexpected tag %d", dp->tag());
1504 }
1505 return (DataLayout*)((address)dp + DataLayout::compute_size_in_bytes(nb_cells));
1506 }
1507
1508 ProfileData* MethodData::bci_to_extra_data_find(int bci, Method* m, DataLayout*& dp) {
1509 check_extra_data_locked();
1510
1511 DataLayout* end = args_data_limit();
1512
1513 for (;; dp = next_extra(dp)) {
1514 assert(dp < end, "moved past end of extra data");
1515 // No need for "Atomic::load_acquire" ops,
1516 // since the data structure is monotonic.
1517 switch(dp->tag()) {
1518 case DataLayout::no_tag:
1519 return nullptr;
1520 case DataLayout::arg_info_data_tag:
1521 dp = end;
1522 return nullptr; // ArgInfoData is at the end of extra data section.
1523 case DataLayout::bit_data_tag:
1524 if (m == nullptr && dp->bci() == bci) {
1525 return new BitData(dp);
1526 }
1527 break;
1528 case DataLayout::speculative_trap_data_tag:
1529 if (m != nullptr) {
1530 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1531 if (dp->bci() == bci) {
1532 assert(data->method() != nullptr, "method must be set");
1533 if (data->method() == m) {
1534 return data;
1535 }
1536 }
1537 }
1538 break;
1539 default:
1540 fatal("unexpected tag %d", dp->tag());
1541 }
1542 }
1543 return nullptr;
1544 }
1545
1546
1547 // Translate a bci to its corresponding extra data, or null.
1548 ProfileData* MethodData::bci_to_extra_data(int bci, Method* m, bool create_if_missing) {
1549 check_extra_data_locked();
1550
1551 // This code assumes an entry for a SpeculativeTrapData is 2 cells
1552 assert(2*DataLayout::compute_size_in_bytes(BitData::static_cell_count()) ==
1553 DataLayout::compute_size_in_bytes(SpeculativeTrapData::static_cell_count()),
1554 "code needs to be adjusted");
1555
1556 // Do not create one of these if method has been redefined.
1557 if (m != nullptr && m->is_old()) {
1558 return nullptr;
1559 }
1560
1561 DataLayout* dp = extra_data_base();
1562 DataLayout* end = args_data_limit();
1563
1564 // Find if already exists
1565 ProfileData* result = bci_to_extra_data_find(bci, m, dp);
1566 if (result != nullptr || dp >= end) {
1567 return result;
1568 }
1569
1570 if (create_if_missing) {
1571 // Not found -> Allocate
1572 assert(dp->tag() == DataLayout::no_tag || (dp->tag() == DataLayout::speculative_trap_data_tag && m != nullptr), "should be free");
1573 assert(next_extra(dp)->tag() == DataLayout::no_tag || next_extra(dp)->tag() == DataLayout::arg_info_data_tag, "should be free or arg info");
1574 u1 tag = m == nullptr ? DataLayout::bit_data_tag : DataLayout::speculative_trap_data_tag;
1575 // SpeculativeTrapData is 2 slots. Make sure we have room.
1576 if (m != nullptr && next_extra(dp)->tag() != DataLayout::no_tag) {
1577 return nullptr;
1578 }
1579 DataLayout temp;
1580 temp.initialize(tag, checked_cast<u2>(bci), 0);
1581
1582 dp->set_header(temp.header());
1583 assert(dp->tag() == tag, "sane");
1584 assert(dp->bci() == bci, "no concurrent allocation");
1585 if (tag == DataLayout::bit_data_tag) {
1586 return new BitData(dp);
1587 } else {
1588 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1589 data->set_method(m);
1590 return data;
1591 }
1592 }
1593 return nullptr;
1594 }
1595
1596 ArgInfoData *MethodData::arg_info() {
1597 DataLayout* dp = extra_data_base();
1598 DataLayout* end = args_data_limit();
1599 for (; dp < end; dp = next_extra(dp)) {
1600 if (dp->tag() == DataLayout::arg_info_data_tag)
1601 return new ArgInfoData(dp);
1602 }
1603 return nullptr;
1604 }
1605
1606 // Printing
1607
1608 void MethodData::print_on(outputStream* st) const {
1609 assert(is_methodData(), "should be method data");
1610 st->print("method data for ");
1611 method()->print_value_on(st);
1612 st->cr();
1613 print_data_on(st);
1614 }
1615
1616 void MethodData::print_value_on(outputStream* st) const {
1617 assert(is_methodData(), "should be method data");
1618 st->print("method data for ");
1619 method()->print_value_on(st);
1620 }
1621
1622 void MethodData::print_data_on(outputStream* st) const {
1623 Mutex* lock = const_cast<MethodData*>(this)->extra_data_lock();
1624 ConditionalMutexLocker ml(lock, !lock->owned_by_self(),
1625 Mutex::_no_safepoint_check_flag);
1626 ResourceMark rm;
1627 ProfileData* data = first_data();
1628 if (_parameters_type_data_di != no_parameters) {
1629 parameters_type_data()->print_data_on(st);
1630 }
1631 for ( ; is_valid(data); data = next_data(data)) {
1632 st->print("%d", dp_to_di(data->dp()));
1633 st->fill_to(6);
1634 data->print_data_on(st, this);
1635 }
1636
1637 st->print_cr("--- Extra data:");
1638 DataLayout* dp = extra_data_base();
1639 DataLayout* end = args_data_limit();
1640 for (;; dp = next_extra(dp)) {
1641 assert(dp < end, "moved past end of extra data");
1642 // No need for "Atomic::load_acquire" ops,
1643 // since the data structure is monotonic.
1644 switch(dp->tag()) {
1645 case DataLayout::no_tag:
1646 continue;
1647 case DataLayout::bit_data_tag:
1648 data = new BitData(dp);
1649 break;
1650 case DataLayout::speculative_trap_data_tag:
1651 data = new SpeculativeTrapData(dp);
1652 break;
1653 case DataLayout::arg_info_data_tag:
1654 data = new ArgInfoData(dp);
1655 dp = end; // ArgInfoData is at the end of extra data section.
1656 break;
1657 default:
1658 fatal("unexpected tag %d", dp->tag());
1659 }
1660 st->print("%d", dp_to_di(data->dp()));
1661 st->fill_to(6);
1662 data->print_data_on(st);
1663 if (dp >= end) return;
1664 }
1665 }
1666
1667 // Verification
1668
1669 void MethodData::verify_on(outputStream* st) {
1670 guarantee(is_methodData(), "object must be method data");
1671 // guarantee(m->is_perm(), "should be in permspace");
1672 this->verify_data_on(st);
1673 }
1674
1675 void MethodData::verify_data_on(outputStream* st) {
1676 NEEDS_CLEANUP;
1677 // not yet implemented.
1678 }
1679
1680 bool MethodData::profile_jsr292(const methodHandle& m, int bci) {
1681 if (m->is_compiled_lambda_form()) {
1682 return true;
1683 }
1684
1685 Bytecode_invoke inv(m , bci);
1686 return inv.is_invokedynamic() || inv.is_invokehandle();
1687 }
1688
1689 bool MethodData::profile_unsafe(const methodHandle& m, int bci) {
1690 Bytecode_invoke inv(m , bci);
1691 if (inv.is_invokevirtual()) {
1692 Symbol* klass = inv.klass();
1693 if (klass == vmSymbols::jdk_internal_misc_Unsafe() ||
1694 klass == vmSymbols::sun_misc_Unsafe() ||
1695 klass == vmSymbols::jdk_internal_misc_ScopedMemoryAccess()) {
1696 Symbol* name = inv.name();
1697 if (name->starts_with("get") || name->starts_with("put")) {
1698 return true;
1699 }
1700 }
1701 }
1702 return false;
1703 }
1704
1705 int MethodData::profile_arguments_flag() {
1706 return TypeProfileLevel % 10;
1707 }
1708
1709 bool MethodData::profile_arguments() {
1710 return profile_arguments_flag() > no_type_profile && profile_arguments_flag() <= type_profile_all && TypeProfileArgsLimit > 0;
1711 }
1712
1713 bool MethodData::profile_arguments_jsr292_only() {
1714 return profile_arguments_flag() == type_profile_jsr292;
1715 }
1716
1717 bool MethodData::profile_all_arguments() {
1718 return profile_arguments_flag() == type_profile_all;
1719 }
1720
1721 bool MethodData::profile_arguments_for_invoke(const methodHandle& m, int bci) {
1722 if (!profile_arguments()) {
1723 return false;
1724 }
1725
1726 if (profile_all_arguments()) {
1727 return true;
1728 }
1729
1730 if (profile_unsafe(m, bci)) {
1731 return true;
1732 }
1733
1734 assert(profile_arguments_jsr292_only(), "inconsistent");
1735 return profile_jsr292(m, bci);
1736 }
1737
1738 int MethodData::profile_return_flag() {
1739 return (TypeProfileLevel % 100) / 10;
1740 }
1741
1742 bool MethodData::profile_return() {
1743 return profile_return_flag() > no_type_profile && profile_return_flag() <= type_profile_all;
1744 }
1745
1746 bool MethodData::profile_return_jsr292_only() {
1747 return profile_return_flag() == type_profile_jsr292;
1748 }
1749
1750 bool MethodData::profile_all_return() {
1751 return profile_return_flag() == type_profile_all;
1752 }
1753
1754 bool MethodData::profile_return_for_invoke(const methodHandle& m, int bci) {
1755 if (!profile_return()) {
1756 return false;
1757 }
1758
1759 if (profile_all_return()) {
1760 return true;
1761 }
1762
1763 assert(profile_return_jsr292_only(), "inconsistent");
1764 return profile_jsr292(m, bci);
1765 }
1766
1767 int MethodData::profile_parameters_flag() {
1768 return TypeProfileLevel / 100;
1769 }
1770
1771 bool MethodData::profile_parameters() {
1772 return profile_parameters_flag() > no_type_profile && profile_parameters_flag() <= type_profile_all;
1773 }
1774
1775 bool MethodData::profile_parameters_jsr292_only() {
1776 return profile_parameters_flag() == type_profile_jsr292;
1777 }
1778
1779 bool MethodData::profile_all_parameters() {
1780 return profile_parameters_flag() == type_profile_all;
1781 }
1782
1783 bool MethodData::profile_parameters_for_method(const methodHandle& m) {
1784 if (!profile_parameters()) {
1785 return false;
1786 }
1787
1788 if (profile_all_parameters()) {
1789 return true;
1790 }
1791
1792 assert(profile_parameters_jsr292_only(), "inconsistent");
1793 return m->is_compiled_lambda_form();
1794 }
1795
1796 void MethodData::metaspace_pointers_do(MetaspaceClosure* it) {
1797 log_trace(aot, training)("Iter(MethodData): %p for %p %s", this, _method, _method->name_and_sig_as_C_string());
1798 it->push(&_method);
1799 if (_parameters_type_data_di != no_parameters) {
1800 parameters_type_data()->metaspace_pointers_do(it);
1801 }
1802 for (ProfileData* data = first_data(); is_valid(data); data = next_data(data)) {
1803 data->metaspace_pointers_do(it);
1804 }
1805 for (DataLayout* dp = extra_data_base();
1806 dp < extra_data_limit();
1807 dp = MethodData::next_extra(dp)) {
1808 if (dp->tag() == DataLayout::speculative_trap_data_tag) {
1809 ResourceMark rm;
1810 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1811 data->metaspace_pointers_do(it);
1812 } else if (dp->tag() == DataLayout::no_tag ||
1813 dp->tag() == DataLayout::arg_info_data_tag) {
1814 break;
1815 }
1816 }
1817 }
1818
1819 void MethodData::clean_extra_data_helper(DataLayout* dp, int shift, bool reset) {
1820 check_extra_data_locked();
1821
1822 if (shift == 0) {
1823 return;
1824 }
1825 if (!reset) {
1826 // Move all cells of trap entry at dp left by "shift" cells
1827 intptr_t* start = (intptr_t*)dp;
1828 intptr_t* end = (intptr_t*)next_extra(dp);
1829 for (intptr_t* ptr = start; ptr < end; ptr++) {
1830 *(ptr-shift) = *ptr;
1831 }
1832 } else {
1833 // Reset "shift" cells stopping at dp
1834 intptr_t* start = ((intptr_t*)dp) - shift;
1835 intptr_t* end = (intptr_t*)dp;
1836 for (intptr_t* ptr = start; ptr < end; ptr++) {
1837 *ptr = 0;
1838 }
1839 }
1840 }
1841
1842 // Check for entries that reference an unloaded method
1843 class CleanExtraDataKlassClosure : public CleanExtraDataClosure {
1844 bool _always_clean;
1845 public:
1846 CleanExtraDataKlassClosure(bool always_clean) : _always_clean(always_clean) {}
1847 bool is_live(Method* m) {
1848 if (!_always_clean && m->method_holder()->is_instance_klass() && InstanceKlass::cast(m->method_holder())->is_not_initialized()) {
1849 return true; // TODO: treat as unloaded instead?
1850 }
1851 return !(_always_clean) && m->method_holder()->is_loader_alive();
1852 }
1853 };
1854
1855 // Check for entries that reference a redefined method
1856 class CleanExtraDataMethodClosure : public CleanExtraDataClosure {
1857 public:
1858 CleanExtraDataMethodClosure() {}
1859 bool is_live(Method* m) { return !m->is_old(); }
1860 };
1861
1862 Mutex* MethodData::extra_data_lock() {
1863 Mutex* lock = Atomic::load(&_extra_data_lock);
1864 if (lock == nullptr) {
1865 // This lock could be acquired while we are holding DumpTimeTable_lock/nosafepoint
1866 lock = new Mutex(Mutex::nosafepoint-1, "MDOExtraData_lock");
1867 Mutex* old = Atomic::cmpxchg(&_extra_data_lock, (Mutex*)nullptr, lock);
1868 if (old != nullptr) {
1869 // Another thread created the lock before us. Use that lock instead.
1870 delete lock;
1871 return old;
1872 }
1873 }
1874 return lock;
1875 }
1876
1877 // Remove SpeculativeTrapData entries that reference an unloaded or
1878 // redefined method
1879 void MethodData::clean_extra_data(CleanExtraDataClosure* cl) {
1880 check_extra_data_locked();
1881
1882 DataLayout* dp = extra_data_base();
1883 DataLayout* end = args_data_limit();
1884
1885 int shift = 0;
1886 for (; dp < end; dp = next_extra(dp)) {
1887 switch(dp->tag()) {
1888 case DataLayout::speculative_trap_data_tag: {
1889 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1890 Method* m = data->method();
1891 assert(m != nullptr, "should have a method");
1892 if (is_excluded(m->method_holder()) || !cl->is_live(m)) {
1893 // "shift" accumulates the number of cells for dead
1894 // SpeculativeTrapData entries that have been seen so
1895 // far. Following entries must be shifted left by that many
1896 // cells to remove the dead SpeculativeTrapData entries.
1897 shift += (int)((intptr_t*)next_extra(dp) - (intptr_t*)dp);
1898 } else {
1899 // Shift this entry left if it follows dead
1900 // SpeculativeTrapData entries
1901 clean_extra_data_helper(dp, shift);
1902 }
1903 break;
1904 }
1905 case DataLayout::bit_data_tag:
1906 // Shift this entry left if it follows dead SpeculativeTrapData
1907 // entries
1908 clean_extra_data_helper(dp, shift);
1909 continue;
1910 case DataLayout::no_tag:
1911 case DataLayout::arg_info_data_tag:
1912 // We are at end of the live trap entries. The previous "shift"
1913 // cells contain entries that are either dead or were shifted
1914 // left. They need to be reset to no_tag
1915 clean_extra_data_helper(dp, shift, true);
1916 return;
1917 default:
1918 fatal("unexpected tag %d", dp->tag());
1919 }
1920 }
1921 }
1922
1923 // Verify there's no unloaded or redefined method referenced by a
1924 // SpeculativeTrapData entry
1925 void MethodData::verify_extra_data_clean(CleanExtraDataClosure* cl) {
1926 check_extra_data_locked();
1927
1928 #ifdef ASSERT
1929 DataLayout* dp = extra_data_base();
1930 DataLayout* end = args_data_limit();
1931
1932 for (; dp < end; dp = next_extra(dp)) {
1933 switch(dp->tag()) {
1934 case DataLayout::speculative_trap_data_tag: {
1935 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1936 Method* m = data->method();
1937 assert(m != nullptr && cl->is_live(m), "Method should exist");
1938 break;
1939 }
1940 case DataLayout::bit_data_tag:
1941 continue;
1942 case DataLayout::no_tag:
1943 case DataLayout::arg_info_data_tag:
1944 return;
1945 default:
1946 fatal("unexpected tag %d", dp->tag());
1947 }
1948 }
1949 #endif
1950 }
1951
1952 void MethodData::clean_method_data(bool always_clean) {
1953 ResourceMark rm;
1954 for (ProfileData* data = first_data();
1955 is_valid(data);
1956 data = next_data(data)) {
1957 data->clean_weak_klass_links(always_clean);
1958 }
1959 ParametersTypeData* parameters = parameters_type_data();
1960 if (parameters != nullptr) {
1961 parameters->clean_weak_klass_links(always_clean);
1962 }
1963
1964 CleanExtraDataKlassClosure cl(always_clean);
1965
1966 // Lock to modify extra data, and prevent Safepoint from breaking the lock
1967 MutexLocker ml(extra_data_lock(), Mutex::_no_safepoint_check_flag);
1968
1969 clean_extra_data(&cl);
1970 verify_extra_data_clean(&cl);
1971 }
1972
1973 // This is called during redefinition to clean all "old" redefined
1974 // methods out of MethodData for all methods.
1975 void MethodData::clean_weak_method_links() {
1976 ResourceMark rm;
1977 CleanExtraDataMethodClosure cl;
1978
1979 // Lock to modify extra data, and prevent Safepoint from breaking the lock
1980 MutexLocker ml(extra_data_lock(), Mutex::_no_safepoint_check_flag);
1981
1982 clean_extra_data(&cl);
1983 verify_extra_data_clean(&cl);
1984 }
1985
1986 void MethodData::deallocate_contents(ClassLoaderData* loader_data) {
1987 release_C_heap_structures();
1988 }
1989
1990 void MethodData::release_C_heap_structures() {
1991 #if INCLUDE_JVMCI
1992 FailedSpeculation::free_failed_speculations(get_failed_speculations_address());
1993 #endif
1994 }
1995
1996 #if INCLUDE_CDS
1997 void MethodData::remove_unshareable_info() {
1998 _extra_data_lock = nullptr;
1999 }
2000
2001 void MethodData::restore_unshareable_info(TRAPS) {
2002 //_extra_data_lock = new Mutex(Mutex::nosafepoint, "MDOExtraData_lock");
2003 }
2004 #endif // INCLUDE_CDS
2005
2006 #ifdef ASSERT
2007 void MethodData::check_extra_data_locked() const {
2008 // Cast const away, just to be able to verify the lock
2009 // Usually we only want non-const accesses on the lock,
2010 // so this here is an exception.
2011 MethodData* self = (MethodData*)this;
2012 assert(self->extra_data_lock()->owned_by_self() || CDSConfig::is_dumping_archive(), "must have lock");
2013 assert(!Thread::current()->is_Java_thread() ||
2014 JavaThread::current()->is_in_no_safepoint_scope(),
2015 "JavaThread must have NoSafepointVerifier inside lock scope");
2016 }
2017 #endif