1 /*
2 * Copyright (c) 2000, 2015, 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 "classfile/systemDictionary.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "interpreter/bytecode.hpp"
29 #include "interpreter/bytecodeStream.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/heapInspection.hpp"
32 #include "oops/methodData.hpp"
33 #include "prims/jvmtiRedefineClasses.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/compilationPolicy.hpp"
36 #include "runtime/deoptimization.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/orderAccess.inline.hpp"
39 #include "utilities/copy.hpp"
40
41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
42
43 // ==================================================================
44 // DataLayout
45 //
46 // Overlay for generic profiling data.
47
48 // Some types of data layouts need a length field.
49 bool DataLayout::needs_array_len(u1 tag) {
50 return (tag == multi_branch_data_tag) || (tag == arg_info_data_tag) || (tag == parameters_type_data_tag);
51 }
52
53 // Perform generic initialization of the data. More specific
54 // initialization occurs in overrides of ProfileData::post_initialize.
55 void DataLayout::initialize(u1 tag, u2 bci, int cell_count) {
56 _header._bits = (intptr_t)0;
57 _header._struct._tag = tag;
58 _header._struct._bci = bci;
59 for (int i = 0; i < cell_count; i++) {
60 set_cell_at(i, (intptr_t)0);
61 }
62 if (needs_array_len(tag)) {
63 set_cell_at(ArrayData::array_len_off_set, cell_count - 1); // -1 for header.
64 }
65 if (tag == call_type_data_tag) {
66 CallTypeData::initialize(this, cell_count);
67 } else if (tag == virtual_call_type_data_tag) {
68 VirtualCallTypeData::initialize(this, cell_count);
69 }
70 }
71
72 void DataLayout::clean_weak_klass_links(BoolObjectClosure* cl) {
73 ResourceMark m;
74 data_in()->clean_weak_klass_links(cl);
75 }
76
77
78 // ==================================================================
79 // ProfileData
80 //
81 // A ProfileData object is created to refer to a section of profiling
82 // data in a structured way.
83
84 // Constructor for invalid ProfileData.
85 ProfileData::ProfileData() {
86 _data = NULL;
87 }
88
89 char* ProfileData::print_data_on_helper(const MethodData* md) const {
90 DataLayout* dp = md->extra_data_base();
91 DataLayout* end = md->args_data_limit();
92 stringStream ss;
93 for (;; dp = MethodData::next_extra(dp)) {
94 assert(dp < end, "moved past end of extra data");
95 switch(dp->tag()) {
96 case DataLayout::speculative_trap_data_tag:
97 if (dp->bci() == bci()) {
98 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
99 int trap = data->trap_state();
100 char buf[100];
101 ss.print("trap/");
102 data->method()->print_short_name(&ss);
103 ss.print("(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
104 }
105 break;
106 case DataLayout::bit_data_tag:
107 break;
108 case DataLayout::no_tag:
109 case DataLayout::arg_info_data_tag:
110 return ss.as_string();
111 break;
112 default:
113 fatal(err_msg("unexpected tag %d", dp->tag()));
114 }
115 }
116 return NULL;
117 }
118
119 void ProfileData::print_data_on(outputStream* st, const MethodData* md) const {
120 print_data_on(st, print_data_on_helper(md));
121 }
122
123 void ProfileData::print_shared(outputStream* st, const char* name, const char* extra) const {
124 st->print("bci: %d", bci());
125 st->fill_to(tab_width_one);
126 st->print("%s", name);
127 tab(st);
128 int trap = trap_state();
129 if (trap != 0) {
130 char buf[100];
131 st->print("trap(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
132 }
133 if (extra != NULL) {
134 st->print("%s", extra);
135 }
136 int flags = data()->flags();
137 if (flags != 0) {
138 st->print("flags(%d) ", flags);
139 }
140 }
141
142 void ProfileData::tab(outputStream* st, bool first) const {
143 st->fill_to(first ? tab_width_one : tab_width_two);
144 }
145
146 // ==================================================================
147 // BitData
148 //
149 // A BitData corresponds to a one-bit flag. This is used to indicate
150 // whether a checkcast bytecode has seen a null value.
151
152
153 void BitData::print_data_on(outputStream* st, const char* extra) const {
154 print_shared(st, "BitData", extra);
155 st->cr();
156 }
157
158 // ==================================================================
159 // CounterData
160 //
161 // A CounterData corresponds to a simple counter.
162
163 void CounterData::print_data_on(outputStream* st, const char* extra) const {
164 print_shared(st, "CounterData", extra);
165 st->print_cr("count(%u)", count());
166 }
167
168 // ==================================================================
169 // JumpData
170 //
171 // A JumpData is used to access profiling information for a direct
172 // branch. It is a counter, used for counting the number of branches,
173 // plus a data displacement, used for realigning the data pointer to
174 // the corresponding target bci.
175
176 void JumpData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
177 assert(stream->bci() == bci(), "wrong pos");
178 int target;
179 Bytecodes::Code c = stream->code();
180 if (c == Bytecodes::_goto_w || c == Bytecodes::_jsr_w) {
181 target = stream->dest_w();
182 } else {
183 target = stream->dest();
184 }
185 int my_di = mdo->dp_to_di(dp());
186 int target_di = mdo->bci_to_di(target);
187 int offset = target_di - my_di;
188 set_displacement(offset);
189 }
190
191 void JumpData::print_data_on(outputStream* st, const char* extra) const {
192 print_shared(st, "JumpData", extra);
193 st->print_cr("taken(%u) displacement(%d)", taken(), displacement());
194 }
195
196 int TypeStackSlotEntries::compute_cell_count(Symbol* signature, bool include_receiver, int max) {
197 // Parameter profiling include the receiver
198 int args_count = include_receiver ? 1 : 0;
199 ResourceMark rm;
200 SignatureStream ss(signature);
201 args_count += ss.reference_parameter_count();
202 args_count = MIN2(args_count, max);
203 return args_count * per_arg_cell_count;
204 }
205
206 int TypeEntriesAtCall::compute_cell_count(BytecodeStream* stream) {
207 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
208 assert(TypeStackSlotEntries::per_arg_count() > ReturnTypeEntry::static_cell_count(), "code to test for arguments/results broken");
209 Bytecode_invoke inv(stream->method(), stream->bci());
210 int args_cell = 0;
211 if (arguments_profiling_enabled()) {
212 args_cell = TypeStackSlotEntries::compute_cell_count(inv.signature(), false, TypeProfileArgsLimit);
213 }
214 int ret_cell = 0;
215 if (return_profiling_enabled() && (inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY)) {
216 ret_cell = ReturnTypeEntry::static_cell_count();
217 }
218 int header_cell = 0;
219 if (args_cell + ret_cell > 0) {
220 header_cell = header_cell_count();
221 }
222
223 return header_cell + args_cell + ret_cell;
224 }
225
226 class ArgumentOffsetComputer : public SignatureInfo {
227 private:
228 int _max;
229 GrowableArray<int> _offsets;
230
231 void set(int size, BasicType type) { _size += size; }
232 void do_object(int begin, int end) {
233 if (_offsets.length() < _max) {
234 _offsets.push(_size);
235 }
236 SignatureInfo::do_object(begin, end);
237 }
238 void do_array (int begin, int end) {
239 if (_offsets.length() < _max) {
240 _offsets.push(_size);
241 }
242 SignatureInfo::do_array(begin, end);
243 }
244
245 public:
246 ArgumentOffsetComputer(Symbol* signature, int max)
247 : SignatureInfo(signature), _max(max), _offsets(Thread::current(), max) {
248 }
249
250 int total() { lazy_iterate_parameters(); return _size; }
251
252 int off_at(int i) const { return _offsets.at(i); }
253 };
254
255 void TypeStackSlotEntries::post_initialize(Symbol* signature, bool has_receiver, bool include_receiver) {
256 ResourceMark rm;
257 int start = 0;
258 // Parameter profiling include the receiver
259 if (include_receiver && has_receiver) {
260 set_stack_slot(0, 0);
261 set_type(0, type_none());
262 start += 1;
263 }
264 ArgumentOffsetComputer aos(signature, _number_of_entries-start);
265 aos.total();
266 for (int i = start; i < _number_of_entries; i++) {
267 set_stack_slot(i, aos.off_at(i-start) + (has_receiver ? 1 : 0));
268 set_type(i, type_none());
269 }
270 }
271
272 void CallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
273 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
274 Bytecode_invoke inv(stream->method(), stream->bci());
275
276 SignatureStream ss(inv.signature());
277 if (has_arguments()) {
278 #ifdef ASSERT
279 ResourceMark rm;
280 int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);
281 assert(count > 0, "room for args type but none found?");
282 check_number_of_arguments(count);
283 #endif
284 _args.post_initialize(inv.signature(), inv.has_receiver(), false);
285 }
286
287 if (has_return()) {
288 assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");
289 _ret.post_initialize();
290 }
291 }
292
293 void VirtualCallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
294 assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
295 Bytecode_invoke inv(stream->method(), stream->bci());
296
297 if (has_arguments()) {
298 #ifdef ASSERT
299 ResourceMark rm;
300 SignatureStream ss(inv.signature());
301 int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);
302 assert(count > 0, "room for args type but none found?");
303 check_number_of_arguments(count);
304 #endif
305 _args.post_initialize(inv.signature(), inv.has_receiver(), false);
306 }
307
308 if (has_return()) {
309 assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");
310 _ret.post_initialize();
311 }
312 }
313
314 bool TypeEntries::is_loader_alive(BoolObjectClosure* is_alive_cl, intptr_t p) {
315 Klass* k = (Klass*)klass_part(p);
316 return k != NULL && k->is_loader_alive(is_alive_cl);
317 }
318
319 void TypeStackSlotEntries::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
320 for (int i = 0; i < _number_of_entries; i++) {
321 intptr_t p = type(i);
322 if (!is_loader_alive(is_alive_cl, p)) {
323 set_type(i, with_status((Klass*)NULL, p));
324 }
325 }
326 }
327
328 void ReturnTypeEntry::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
329 intptr_t p = type();
330 if (!is_loader_alive(is_alive_cl, p)) {
331 set_type(with_status((Klass*)NULL, p));
332 }
333 }
334
335 bool TypeEntriesAtCall::return_profiling_enabled() {
336 return MethodData::profile_return();
337 }
338
339 bool TypeEntriesAtCall::arguments_profiling_enabled() {
340 return MethodData::profile_arguments();
341 }
342
343 void TypeEntries::print_klass(outputStream* st, intptr_t k) {
344 if (is_type_none(k)) {
345 st->print("none");
346 } else if (is_type_unknown(k)) {
347 st->print("unknown");
348 } else {
349 valid_klass(k)->print_value_on(st);
350 }
351 if (was_null_seen(k)) {
352 st->print(" (null seen)");
353 }
354 }
355
356 void TypeStackSlotEntries::print_data_on(outputStream* st) const {
357 for (int i = 0; i < _number_of_entries; i++) {
358 _pd->tab(st);
359 st->print("%d: stack(%u) ", i, stack_slot(i));
360 print_klass(st, type(i));
361 st->cr();
362 }
363 }
364
365 void ReturnTypeEntry::print_data_on(outputStream* st) const {
366 _pd->tab(st);
367 print_klass(st, type());
368 st->cr();
369 }
370
371 void CallTypeData::print_data_on(outputStream* st, const char* extra) const {
372 CounterData::print_data_on(st, extra);
373 if (has_arguments()) {
374 tab(st, true);
375 st->print("argument types");
376 _args.print_data_on(st);
377 }
378 if (has_return()) {
379 tab(st, true);
380 st->print("return type");
381 _ret.print_data_on(st);
382 }
383 }
384
385 void VirtualCallTypeData::print_data_on(outputStream* st, const char* extra) const {
386 VirtualCallData::print_data_on(st, extra);
387 if (has_arguments()) {
388 tab(st, true);
389 st->print("argument types");
390 _args.print_data_on(st);
391 }
392 if (has_return()) {
393 tab(st, true);
394 st->print("return type");
395 _ret.print_data_on(st);
396 }
397 }
398
399 // ==================================================================
400 // ReceiverTypeData
401 //
402 // A ReceiverTypeData is used to access profiling information about a
403 // dynamic type check. It consists of a counter which counts the total times
404 // that the check is reached, and a series of (Klass*, count) pairs
405 // which are used to store a type profile for the receiver of the check.
406
407 void ReceiverTypeData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
408 for (uint row = 0; row < row_limit(); row++) {
409 Klass* p = receiver(row);
410 if (p != NULL && !p->is_loader_alive(is_alive_cl)) {
411 clear_row(row);
412 }
413 }
414 }
415
416 #if INCLUDE_JVMCI
417 void VirtualCallData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
418 ReceiverTypeData::clean_weak_klass_links(is_alive_cl);
419 for (uint row = 0; row < method_row_limit(); row++) {
420 Method* p = method(row);
421 if (p != NULL && !p->method_holder()->is_loader_alive(is_alive_cl)) {
422 clear_method_row(row);
423 }
424 }
425 }
426
427 void VirtualCallData::clean_weak_method_links() {
428 ReceiverTypeData::clean_weak_method_links();
429 for (uint row = 0; row < method_row_limit(); row++) {
430 Method* p = method(row);
431 if (p != NULL && !p->on_stack()) {
432 clear_method_row(row);
433 }
434 }
435 }
436 #endif // INCLUDE_JVMCI
437
438 void ReceiverTypeData::print_receiver_data_on(outputStream* st) const {
439 uint row;
440 int entries = 0;
441 for (row = 0; row < row_limit(); row++) {
442 if (receiver(row) != NULL) entries++;
443 }
444 #if INCLUDE_JVMCI
445 st->print_cr("count(%u) nonprofiled_count(%u) entries(%u)", count(), nonprofiled_count(), entries);
446 #else
447 st->print_cr("count(%u) entries(%u)", count(), entries);
448 #endif
449 int total = count();
450 for (row = 0; row < row_limit(); row++) {
451 if (receiver(row) != NULL) {
452 total += receiver_count(row);
453 }
454 }
455 for (row = 0; row < row_limit(); row++) {
456 if (receiver(row) != NULL) {
457 tab(st);
458 receiver(row)->print_value_on(st);
459 st->print_cr("(%u %4.2f)", receiver_count(row), (float) receiver_count(row) / (float) total);
460 }
461 }
462 }
463 void ReceiverTypeData::print_data_on(outputStream* st, const char* extra) const {
464 print_shared(st, "ReceiverTypeData", extra);
465 print_receiver_data_on(st);
466 }
467
468 #if INCLUDE_JVMCI
469 void VirtualCallData::print_method_data_on(outputStream* st) const {
470 uint row;
471 int entries = 0;
472 for (row = 0; row < method_row_limit(); row++) {
473 if (method(row) != NULL) entries++;
474 }
475 tab(st);
476 st->print_cr("method_entries(%u)", entries);
477 int total = count();
478 for (row = 0; row < method_row_limit(); row++) {
479 if (method(row) != NULL) {
480 total += method_count(row);
481 }
482 }
483 for (row = 0; row < method_row_limit(); row++) {
484 if (method(row) != NULL) {
485 tab(st);
486 method(row)->print_value_on(st);
487 st->print_cr("(%u %4.2f)", method_count(row), (float) method_count(row) / (float) total);
488 }
489 }
490 }
491 #endif // INCLUDE_JVMCI
492
493 void VirtualCallData::print_data_on(outputStream* st, const char* extra) const {
494 print_shared(st, "VirtualCallData", extra);
495 print_receiver_data_on(st);
496 print_method_data_on(st);
497 }
498
499 // ==================================================================
500 // RetData
501 //
502 // A RetData is used to access profiling information for a ret bytecode.
503 // It is composed of a count of the number of times that the ret has
504 // been executed, followed by a series of triples of the form
505 // (bci, count, di) which count the number of times that some bci was the
506 // target of the ret and cache a corresponding displacement.
507
508 void RetData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
509 for (uint row = 0; row < row_limit(); row++) {
510 set_bci_displacement(row, -1);
511 set_bci(row, no_bci);
512 }
513 // release so other threads see a consistent state. bci is used as
514 // a valid flag for bci_displacement.
515 OrderAccess::release();
516 }
517
518 // This routine needs to atomically update the RetData structure, so the
519 // caller needs to hold the RetData_lock before it gets here. Since taking
520 // the lock can block (and allow GC) and since RetData is a ProfileData is a
521 // wrapper around a derived oop, taking the lock in _this_ method will
522 // basically cause the 'this' pointer's _data field to contain junk after the
523 // lock. We require the caller to take the lock before making the ProfileData
524 // structure. Currently the only caller is InterpreterRuntime::update_mdp_for_ret
525 address RetData::fixup_ret(int return_bci, MethodData* h_mdo) {
526 // First find the mdp which corresponds to the return bci.
527 address mdp = h_mdo->bci_to_dp(return_bci);
528
529 // Now check to see if any of the cache slots are open.
530 for (uint row = 0; row < row_limit(); row++) {
531 if (bci(row) == no_bci) {
532 set_bci_displacement(row, mdp - dp());
533 set_bci_count(row, DataLayout::counter_increment);
534 // Barrier to ensure displacement is written before the bci; allows
535 // the interpreter to read displacement without fear of race condition.
536 release_set_bci(row, return_bci);
537 break;
538 }
539 }
540 return mdp;
541 }
542
543 #ifdef CC_INTERP
544 DataLayout* RetData::advance(MethodData *md, int bci) {
545 return (DataLayout*) md->bci_to_dp(bci);
546 }
547 #endif // CC_INTERP
548
549 void RetData::print_data_on(outputStream* st, const char* extra) const {
550 print_shared(st, "RetData", extra);
551 uint row;
552 int entries = 0;
553 for (row = 0; row < row_limit(); row++) {
554 if (bci(row) != no_bci) entries++;
555 }
556 st->print_cr("count(%u) entries(%u)", count(), entries);
557 for (row = 0; row < row_limit(); row++) {
558 if (bci(row) != no_bci) {
559 tab(st);
560 st->print_cr("bci(%d: count(%u) displacement(%d))",
561 bci(row), bci_count(row), bci_displacement(row));
562 }
563 }
564 }
565
566 // ==================================================================
567 // BranchData
568 //
569 // A BranchData is used to access profiling data for a two-way branch.
570 // It consists of taken and not_taken counts as well as a data displacement
571 // for the taken case.
572
573 void BranchData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
574 assert(stream->bci() == bci(), "wrong pos");
575 int target = stream->dest();
576 int my_di = mdo->dp_to_di(dp());
577 int target_di = mdo->bci_to_di(target);
578 int offset = target_di - my_di;
579 set_displacement(offset);
580 }
581
582 void BranchData::print_data_on(outputStream* st, const char* extra) const {
583 print_shared(st, "BranchData", extra);
584 st->print_cr("taken(%u) displacement(%d)",
585 taken(), displacement());
586 tab(st);
587 st->print_cr("not taken(%u)", not_taken());
588 }
589
590 // ==================================================================
591 // MultiBranchData
592 //
593 // A MultiBranchData is used to access profiling information for
594 // a multi-way branch (*switch bytecodes). It consists of a series
595 // of (count, displacement) pairs, which count the number of times each
596 // case was taken and specify the data displacment for each branch target.
597
598 int MultiBranchData::compute_cell_count(BytecodeStream* stream) {
599 int cell_count = 0;
600 if (stream->code() == Bytecodes::_tableswitch) {
601 Bytecode_tableswitch sw(stream->method()(), stream->bcp());
602 cell_count = 1 + per_case_cell_count * (1 + sw.length()); // 1 for default
603 } else {
604 Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
605 cell_count = 1 + per_case_cell_count * (sw.number_of_pairs() + 1); // 1 for default
606 }
607 return cell_count;
608 }
609
610 void MultiBranchData::post_initialize(BytecodeStream* stream,
611 MethodData* mdo) {
612 assert(stream->bci() == bci(), "wrong pos");
613 int target;
614 int my_di;
615 int target_di;
616 int offset;
617 if (stream->code() == Bytecodes::_tableswitch) {
618 Bytecode_tableswitch sw(stream->method()(), stream->bcp());
619 int len = sw.length();
620 assert(array_len() == per_case_cell_count * (len + 1), "wrong len");
621 for (int count = 0; count < len; count++) {
622 target = sw.dest_offset_at(count) + bci();
623 my_di = mdo->dp_to_di(dp());
624 target_di = mdo->bci_to_di(target);
625 offset = target_di - my_di;
626 set_displacement_at(count, offset);
627 }
628 target = sw.default_offset() + bci();
629 my_di = mdo->dp_to_di(dp());
630 target_di = mdo->bci_to_di(target);
631 offset = target_di - my_di;
632 set_default_displacement(offset);
633
634 } else {
635 Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
636 int npairs = sw.number_of_pairs();
637 assert(array_len() == per_case_cell_count * (npairs + 1), "wrong len");
638 for (int count = 0; count < npairs; count++) {
639 LookupswitchPair pair = sw.pair_at(count);
640 target = pair.offset() + bci();
641 my_di = mdo->dp_to_di(dp());
642 target_di = mdo->bci_to_di(target);
643 offset = target_di - my_di;
644 set_displacement_at(count, offset);
645 }
646 target = sw.default_offset() + bci();
647 my_di = mdo->dp_to_di(dp());
648 target_di = mdo->bci_to_di(target);
649 offset = target_di - my_di;
650 set_default_displacement(offset);
651 }
652 }
653
654 void MultiBranchData::print_data_on(outputStream* st, const char* extra) const {
655 print_shared(st, "MultiBranchData", extra);
656 st->print_cr("default_count(%u) displacement(%d)",
657 default_count(), default_displacement());
658 int cases = number_of_cases();
659 for (int i = 0; i < cases; i++) {
660 tab(st);
661 st->print_cr("count(%u) displacement(%d)",
662 count_at(i), displacement_at(i));
663 }
664 }
665
666 void ArgInfoData::print_data_on(outputStream* st, const char* extra) const {
667 print_shared(st, "ArgInfoData", extra);
668 int nargs = number_of_args();
669 for (int i = 0; i < nargs; i++) {
670 st->print(" 0x%x", arg_modified(i));
671 }
672 st->cr();
673 }
674
675 int ParametersTypeData::compute_cell_count(Method* m) {
676 if (!MethodData::profile_parameters_for_method(m)) {
677 return 0;
678 }
679 int max = TypeProfileParmsLimit == -1 ? INT_MAX : TypeProfileParmsLimit;
680 int obj_args = TypeStackSlotEntries::compute_cell_count(m->signature(), !m->is_static(), max);
681 if (obj_args > 0) {
682 return obj_args + 1; // 1 cell for array len
683 }
684 return 0;
685 }
686
687 void ParametersTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
688 _parameters.post_initialize(mdo->method()->signature(), !mdo->method()->is_static(), true);
689 }
690
691 bool ParametersTypeData::profiling_enabled() {
692 return MethodData::profile_parameters();
693 }
694
695 void ParametersTypeData::print_data_on(outputStream* st, const char* extra) const {
696 st->print("parameter types"); // FIXME extra ignored?
697 _parameters.print_data_on(st);
698 }
699
700 void SpeculativeTrapData::print_data_on(outputStream* st, const char* extra) const {
701 print_shared(st, "SpeculativeTrapData", extra);
702 tab(st);
703 method()->print_short_name(st);
704 st->cr();
705 }
706
707 // ==================================================================
708 // MethodData*
709 //
710 // A MethodData* holds information which has been collected about
711 // a method.
712
713 MethodData* MethodData::allocate(ClassLoaderData* loader_data, methodHandle method, TRAPS) {
714 int size = MethodData::compute_allocation_size_in_words(method);
715
716 return new (loader_data, size, false, MetaspaceObj::MethodDataType, THREAD)
717 MethodData(method(), size, THREAD);
718 }
719
720 int MethodData::bytecode_cell_count(Bytecodes::Code code) {
721 #if defined(COMPILER1) && !(defined(COMPILER2) || INCLUDE_JVMCI)
722 return no_profile_data;
723 #else
724 switch (code) {
725 case Bytecodes::_checkcast:
726 case Bytecodes::_instanceof:
727 case Bytecodes::_aastore:
728 if (TypeProfileCasts) {
729 return ReceiverTypeData::static_cell_count();
730 } else {
731 return BitData::static_cell_count();
732 }
733 case Bytecodes::_invokespecial:
734 case Bytecodes::_invokestatic:
735 if (MethodData::profile_arguments() || MethodData::profile_return()) {
736 return variable_cell_count;
737 } else {
738 return CounterData::static_cell_count();
739 }
740 case Bytecodes::_goto:
741 case Bytecodes::_goto_w:
742 case Bytecodes::_jsr:
743 case Bytecodes::_jsr_w:
744 return JumpData::static_cell_count();
745 case Bytecodes::_invokevirtual:
746 case Bytecodes::_invokeinterface:
747 if (MethodData::profile_arguments() || MethodData::profile_return()) {
748 return variable_cell_count;
749 } else {
750 return VirtualCallData::static_cell_count();
751 }
752 case Bytecodes::_invokedynamic:
753 if (MethodData::profile_arguments() || MethodData::profile_return()) {
754 return variable_cell_count;
755 } else {
756 return CounterData::static_cell_count();
757 }
758 case Bytecodes::_ret:
759 return RetData::static_cell_count();
760 case Bytecodes::_ifeq:
761 case Bytecodes::_ifne:
762 case Bytecodes::_iflt:
763 case Bytecodes::_ifge:
764 case Bytecodes::_ifgt:
765 case Bytecodes::_ifle:
766 case Bytecodes::_if_icmpeq:
767 case Bytecodes::_if_icmpne:
768 case Bytecodes::_if_icmplt:
769 case Bytecodes::_if_icmpge:
770 case Bytecodes::_if_icmpgt:
771 case Bytecodes::_if_icmple:
772 case Bytecodes::_if_acmpeq:
773 case Bytecodes::_if_acmpne:
774 case Bytecodes::_ifnull:
775 case Bytecodes::_ifnonnull:
776 return BranchData::static_cell_count();
777 case Bytecodes::_lookupswitch:
778 case Bytecodes::_tableswitch:
779 return variable_cell_count;
780 }
781 return no_profile_data;
782 #endif
783 }
784
785 // Compute the size of the profiling information corresponding to
786 // the current bytecode.
787 int MethodData::compute_data_size(BytecodeStream* stream) {
788 int cell_count = bytecode_cell_count(stream->code());
789 if (cell_count == no_profile_data) {
790 return 0;
791 }
792 if (cell_count == variable_cell_count) {
793 switch (stream->code()) {
794 case Bytecodes::_lookupswitch:
795 case Bytecodes::_tableswitch:
796 cell_count = MultiBranchData::compute_cell_count(stream);
797 break;
798 case Bytecodes::_invokespecial:
799 case Bytecodes::_invokestatic:
800 case Bytecodes::_invokedynamic:
801 assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
802 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
803 profile_return_for_invoke(stream->method(), stream->bci())) {
804 cell_count = CallTypeData::compute_cell_count(stream);
805 } else {
806 cell_count = CounterData::static_cell_count();
807 }
808 break;
809 case Bytecodes::_invokevirtual:
810 case Bytecodes::_invokeinterface: {
811 assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
812 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
813 profile_return_for_invoke(stream->method(), stream->bci())) {
814 cell_count = VirtualCallTypeData::compute_cell_count(stream);
815 } else {
816 cell_count = VirtualCallData::static_cell_count();
817 }
818 break;
819 }
820 default:
821 fatal("unexpected bytecode for var length profile data");
822 }
823 }
824 // Note: cell_count might be zero, meaning that there is just
825 // a DataLayout header, with no extra cells.
826 assert(cell_count >= 0, "sanity");
827 return DataLayout::compute_size_in_bytes(cell_count);
828 }
829
830 bool MethodData::is_speculative_trap_bytecode(Bytecodes::Code code) {
831 // Bytecodes for which we may use speculation
832 switch (code) {
833 case Bytecodes::_checkcast:
834 case Bytecodes::_instanceof:
835 case Bytecodes::_aastore:
836 case Bytecodes::_invokevirtual:
837 case Bytecodes::_invokeinterface:
838 case Bytecodes::_if_acmpeq:
839 case Bytecodes::_if_acmpne:
840 case Bytecodes::_ifnull:
841 case Bytecodes::_ifnonnull:
842 case Bytecodes::_invokestatic:
843 #ifdef COMPILER2
844 return UseTypeSpeculation;
845 #endif
846 default:
847 return false;
848 }
849 return false;
850 }
851
852 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps) {
853 #if INCLUDE_JVMCI
854 if (ProfileTraps) {
855 // Assume that up to 30% of the possibly trapping BCIs with no MDP will need to allocate one.
856 int extra_data_count = MIN2(empty_bc_count, MAX2(4, (empty_bc_count * 30) / 100));
857
858 // Make sure we have a minimum number of extra data slots to
859 // allocate SpeculativeTrapData entries. We would want to have one
860 // entry per compilation that inlines this method and for which
861 // some type speculation assumption fails. So the room we need for
862 // the SpeculativeTrapData entries doesn't directly depend on the
863 // size of the method. Because it's hard to estimate, we reserve
864 // space for an arbitrary number of entries.
865 int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
866 (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
867
868 return MAX2(extra_data_count, spec_data_count);
869 } else {
870 return 0;
871 }
872 #else // INCLUDE_JVMCI
873 if (ProfileTraps) {
874 // Assume that up to 3% of BCIs with no MDP will need to allocate one.
875 int extra_data_count = (uint)(empty_bc_count * 3) / 128 + 1;
876 // If the method is large, let the extra BCIs grow numerous (to ~1%).
877 int one_percent_of_data
878 = (uint)data_size / (DataLayout::header_size_in_bytes()*128);
879 if (extra_data_count < one_percent_of_data)
880 extra_data_count = one_percent_of_data;
881 if (extra_data_count > empty_bc_count)
882 extra_data_count = empty_bc_count; // no need for more
883
884 // Make sure we have a minimum number of extra data slots to
885 // allocate SpeculativeTrapData entries. We would want to have one
886 // entry per compilation that inlines this method and for which
887 // some type speculation assumption fails. So the room we need for
888 // the SpeculativeTrapData entries doesn't directly depend on the
889 // size of the method. Because it's hard to estimate, we reserve
890 // space for an arbitrary number of entries.
891 int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
892 (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
893
894 return MAX2(extra_data_count, spec_data_count);
895 } else {
896 return 0;
897 }
898 #endif // INCLUDE_JVMCI
899 }
900
901 // Compute the size of the MethodData* necessary to store
902 // profiling information about a given method. Size is in bytes.
903 int MethodData::compute_allocation_size_in_bytes(methodHandle method) {
904 int data_size = 0;
905 BytecodeStream stream(method);
906 Bytecodes::Code c;
907 int empty_bc_count = 0; // number of bytecodes lacking data
908 bool needs_speculative_traps = false;
909 while ((c = stream.next()) >= 0) {
910 int size_in_bytes = compute_data_size(&stream);
911 data_size += size_in_bytes;
912 if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c))) empty_bc_count += 1;
913 needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
914 }
915 int object_size = in_bytes(data_offset()) + data_size;
916
917 // Add some extra DataLayout cells (at least one) to track stray traps.
918 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
919 object_size += extra_data_count * DataLayout::compute_size_in_bytes(0);
920
921 // Add a cell to record information about modified arguments.
922 int arg_size = method->size_of_parameters();
923 object_size += DataLayout::compute_size_in_bytes(arg_size+1);
924
925 // Reserve room for an area of the MDO dedicated to profiling of
926 // parameters
927 int args_cell = ParametersTypeData::compute_cell_count(method());
928 if (args_cell > 0) {
929 object_size += DataLayout::compute_size_in_bytes(args_cell);
930 }
931 return object_size;
932 }
933
934 // Compute the size of the MethodData* necessary to store
935 // profiling information about a given method. Size is in words
936 int MethodData::compute_allocation_size_in_words(methodHandle method) {
937 int byte_size = compute_allocation_size_in_bytes(method);
938 int word_size = align_size_up(byte_size, BytesPerWord) / BytesPerWord;
939 return align_object_size(word_size);
940 }
941
942 // Initialize an individual data segment. Returns the size of
943 // the segment in bytes.
944 int MethodData::initialize_data(BytecodeStream* stream,
945 int data_index) {
946 #if defined(COMPILER1) && !(defined(COMPILER2) || INCLUDE_JVMCI)
947 return 0;
948 #else
949 int cell_count = -1;
950 int tag = DataLayout::no_tag;
951 DataLayout* data_layout = data_layout_at(data_index);
952 Bytecodes::Code c = stream->code();
953 switch (c) {
954 case Bytecodes::_checkcast:
955 case Bytecodes::_instanceof:
956 case Bytecodes::_aastore:
957 if (TypeProfileCasts) {
958 cell_count = ReceiverTypeData::static_cell_count();
959 tag = DataLayout::receiver_type_data_tag;
960 } else {
961 cell_count = BitData::static_cell_count();
962 tag = DataLayout::bit_data_tag;
963 }
964 break;
965 case Bytecodes::_invokespecial:
966 case Bytecodes::_invokestatic: {
967 int counter_data_cell_count = CounterData::static_cell_count();
968 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
969 profile_return_for_invoke(stream->method(), stream->bci())) {
970 cell_count = CallTypeData::compute_cell_count(stream);
971 } else {
972 cell_count = counter_data_cell_count;
973 }
974 if (cell_count > counter_data_cell_count) {
975 tag = DataLayout::call_type_data_tag;
976 } else {
977 tag = DataLayout::counter_data_tag;
978 }
979 break;
980 }
981 case Bytecodes::_goto:
982 case Bytecodes::_goto_w:
983 case Bytecodes::_jsr:
984 case Bytecodes::_jsr_w:
985 cell_count = JumpData::static_cell_count();
986 tag = DataLayout::jump_data_tag;
987 break;
988 case Bytecodes::_invokevirtual:
989 case Bytecodes::_invokeinterface: {
990 int virtual_call_data_cell_count = VirtualCallData::static_cell_count();
991 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
992 profile_return_for_invoke(stream->method(), stream->bci())) {
993 cell_count = VirtualCallTypeData::compute_cell_count(stream);
994 } else {
995 cell_count = virtual_call_data_cell_count;
996 }
997 if (cell_count > virtual_call_data_cell_count) {
998 tag = DataLayout::virtual_call_type_data_tag;
999 } else {
1000 tag = DataLayout::virtual_call_data_tag;
1001 }
1002 break;
1003 }
1004 case Bytecodes::_invokedynamic: {
1005 // %%% should make a type profile for any invokedynamic that takes a ref argument
1006 int counter_data_cell_count = CounterData::static_cell_count();
1007 if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
1008 profile_return_for_invoke(stream->method(), stream->bci())) {
1009 cell_count = CallTypeData::compute_cell_count(stream);
1010 } else {
1011 cell_count = counter_data_cell_count;
1012 }
1013 if (cell_count > counter_data_cell_count) {
1014 tag = DataLayout::call_type_data_tag;
1015 } else {
1016 tag = DataLayout::counter_data_tag;
1017 }
1018 break;
1019 }
1020 case Bytecodes::_ret:
1021 cell_count = RetData::static_cell_count();
1022 tag = DataLayout::ret_data_tag;
1023 break;
1024 case Bytecodes::_ifeq:
1025 case Bytecodes::_ifne:
1026 case Bytecodes::_iflt:
1027 case Bytecodes::_ifge:
1028 case Bytecodes::_ifgt:
1029 case Bytecodes::_ifle:
1030 case Bytecodes::_if_icmpeq:
1031 case Bytecodes::_if_icmpne:
1032 case Bytecodes::_if_icmplt:
1033 case Bytecodes::_if_icmpge:
1034 case Bytecodes::_if_icmpgt:
1035 case Bytecodes::_if_icmple:
1036 case Bytecodes::_if_acmpeq:
1037 case Bytecodes::_if_acmpne:
1038 case Bytecodes::_ifnull:
1039 case Bytecodes::_ifnonnull:
1040 cell_count = BranchData::static_cell_count();
1041 tag = DataLayout::branch_data_tag;
1042 break;
1043 case Bytecodes::_lookupswitch:
1044 case Bytecodes::_tableswitch:
1045 cell_count = MultiBranchData::compute_cell_count(stream);
1046 tag = DataLayout::multi_branch_data_tag;
1047 break;
1048 }
1049 assert(tag == DataLayout::multi_branch_data_tag ||
1050 ((MethodData::profile_arguments() || MethodData::profile_return()) &&
1051 (tag == DataLayout::call_type_data_tag ||
1052 tag == DataLayout::counter_data_tag ||
1053 tag == DataLayout::virtual_call_type_data_tag ||
1054 tag == DataLayout::virtual_call_data_tag)) ||
1055 cell_count == bytecode_cell_count(c), "cell counts must agree");
1056 if (cell_count >= 0) {
1057 assert(tag != DataLayout::no_tag, "bad tag");
1058 assert(bytecode_has_profile(c), "agree w/ BHP");
1059 data_layout->initialize(tag, stream->bci(), cell_count);
1060 return DataLayout::compute_size_in_bytes(cell_count);
1061 } else {
1062 assert(!bytecode_has_profile(c), "agree w/ !BHP");
1063 return 0;
1064 }
1065 #endif
1066 }
1067
1068 // Get the data at an arbitrary (sort of) data index.
1069 ProfileData* MethodData::data_at(int data_index) const {
1070 if (out_of_bounds(data_index)) {
1071 return NULL;
1072 }
1073 DataLayout* data_layout = data_layout_at(data_index);
1074 return data_layout->data_in();
1075 }
1076
1077 ProfileData* DataLayout::data_in() {
1078 switch (tag()) {
1079 case DataLayout::no_tag:
1080 default:
1081 ShouldNotReachHere();
1082 return NULL;
1083 case DataLayout::bit_data_tag:
1084 return new BitData(this);
1085 case DataLayout::counter_data_tag:
1086 return new CounterData(this);
1087 case DataLayout::jump_data_tag:
1088 return new JumpData(this);
1089 case DataLayout::receiver_type_data_tag:
1090 return new ReceiverTypeData(this);
1091 case DataLayout::virtual_call_data_tag:
1092 return new VirtualCallData(this);
1093 case DataLayout::ret_data_tag:
1094 return new RetData(this);
1095 case DataLayout::branch_data_tag:
1096 return new BranchData(this);
1097 case DataLayout::multi_branch_data_tag:
1098 return new MultiBranchData(this);
1099 case DataLayout::arg_info_data_tag:
1100 return new ArgInfoData(this);
1101 case DataLayout::call_type_data_tag:
1102 return new CallTypeData(this);
1103 case DataLayout::virtual_call_type_data_tag:
1104 return new VirtualCallTypeData(this);
1105 case DataLayout::parameters_type_data_tag:
1106 return new ParametersTypeData(this);
1107 };
1108 }
1109
1110 // Iteration over data.
1111 ProfileData* MethodData::next_data(ProfileData* current) const {
1112 int current_index = dp_to_di(current->dp());
1113 int next_index = current_index + current->size_in_bytes();
1114 ProfileData* next = data_at(next_index);
1115 return next;
1116 }
1117
1118 // Give each of the data entries a chance to perform specific
1119 // data initialization.
1120 void MethodData::post_initialize(BytecodeStream* stream) {
1121 ResourceMark rm;
1122 ProfileData* data;
1123 for (data = first_data(); is_valid(data); data = next_data(data)) {
1124 stream->set_start(data->bci());
1125 stream->next();
1126 data->post_initialize(stream, this);
1127 }
1128 if (_parameters_type_data_di != no_parameters) {
1129 parameters_type_data()->post_initialize(NULL, this);
1130 }
1131 }
1132
1133 // Initialize the MethodData* corresponding to a given method.
1134 MethodData::MethodData(methodHandle method, int size, TRAPS)
1135 : _extra_data_lock(Monitor::leaf, "MDO extra data lock"),
1136 _parameters_type_data_di(parameters_uninitialized) {
1137 // Set the method back-pointer.
1138 _method = method();
1139 initialize();
1140 }
1141
1142 void MethodData::initialize() {
1143 No_Safepoint_Verifier no_safepoint; // init function atomic wrt GC
1144 ResourceMark rm;
1145
1146 init();
1147 set_creation_mileage(mileage_of(method()));
1148
1149 // Go through the bytecodes and allocate and initialize the
1150 // corresponding data cells.
1151 int data_size = 0;
1152 int empty_bc_count = 0; // number of bytecodes lacking data
1153 _data[0] = 0; // apparently not set below.
1154 BytecodeStream stream(method());
1155 Bytecodes::Code c;
1156 bool needs_speculative_traps = false;
1157 while ((c = stream.next()) >= 0) {
1158 int size_in_bytes = initialize_data(&stream, data_size);
1159 data_size += size_in_bytes;
1160 if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c))) empty_bc_count += 1;
1161 needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
1162 }
1163 _data_size = data_size;
1164 int object_size = in_bytes(data_offset()) + data_size;
1165
1166 // Add some extra DataLayout cells (at least one) to track stray traps.
1167 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
1168 int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0);
1169
1170 // Let's zero the space for the extra data
1171 Copy::zero_to_bytes(((address)_data) + data_size, extra_size);
1172
1173 // Add a cell to record information about modified arguments.
1174 // Set up _args_modified array after traps cells so that
1175 // the code for traps cells works.
1176 DataLayout *dp = data_layout_at(data_size + extra_size);
1177
1178 int arg_size = method()->size_of_parameters();
1179 dp->initialize(DataLayout::arg_info_data_tag, 0, arg_size+1);
1180
1181 int arg_data_size = DataLayout::compute_size_in_bytes(arg_size+1);
1182 object_size += extra_size + arg_data_size;
1183
1184 int parms_cell = ParametersTypeData::compute_cell_count(method());
1185 // If we are profiling parameters, we reserver an area near the end
1186 // of the MDO after the slots for bytecodes (because there's no bci
1187 // for method entry so they don't fit with the framework for the
1188 // profiling of bytecodes). We store the offset within the MDO of
1189 // this area (or -1 if no parameter is profiled)
1190 if (parms_cell > 0) {
1191 object_size += DataLayout::compute_size_in_bytes(parms_cell);
1192 _parameters_type_data_di = data_size + extra_size + arg_data_size;
1193 DataLayout *dp = data_layout_at(data_size + extra_size + arg_data_size);
1194 dp->initialize(DataLayout::parameters_type_data_tag, 0, parms_cell);
1195 } else {
1196 _parameters_type_data_di = no_parameters;
1197 }
1198
1199 // Set an initial hint. Don't use set_hint_di() because
1200 // first_di() may be out of bounds if data_size is 0.
1201 // In that situation, _hint_di is never used, but at
1202 // least well-defined.
1203 _hint_di = first_di();
1204
1205 post_initialize(&stream);
1206
1207 assert(object_size == compute_allocation_size_in_bytes(methodHandle(_method)), "MethodData: computed size != initialized size");
1208 set_size(object_size);
1209 }
1210
1211 void MethodData::init() {
1212 _invocation_counter.init();
1213 _backedge_counter.init();
1214 _invocation_counter_start = 0;
1215 _backedge_counter_start = 0;
1216
1217 // Set per-method invoke- and backedge mask.
1218 double scale = 1.0;
1219 CompilerOracle::has_option_value(_method, "CompileThresholdScaling", scale);
1220 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1221 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1222
1223 _tenure_traps = 0;
1224 _num_loops = 0;
1225 _num_blocks = 0;
1226 _would_profile = unknown;
1227
1228 #if INCLUDE_JVMCI
1229 _jvmci_ir_size = 0;
1230 #endif
1231
1232 #if INCLUDE_RTM_OPT
1233 _rtm_state = NoRTM; // No RTM lock eliding by default
1234 if (UseRTMLocking &&
1235 !CompilerOracle::has_option_string(_method, "NoRTMLockEliding")) {
1236 if (CompilerOracle::has_option_string(_method, "UseRTMLockEliding") || !UseRTMDeopt) {
1237 // Generate RTM lock eliding code without abort ratio calculation code.
1238 _rtm_state = UseRTM;
1239 } else if (UseRTMDeopt) {
1240 // Generate RTM lock eliding code and include abort ratio calculation
1241 // code if UseRTMDeopt is on.
1242 _rtm_state = ProfileRTM;
1243 }
1244 }
1245 #endif
1246
1247 // Initialize flags and trap history.
1248 _nof_decompiles = 0;
1249 _nof_overflow_recompiles = 0;
1250 _nof_overflow_traps = 0;
1251 clear_escape_info();
1252 assert(sizeof(_trap_hist) % sizeof(HeapWord) == 0, "align");
1253 Copy::zero_to_words((HeapWord*) &_trap_hist,
1254 sizeof(_trap_hist) / sizeof(HeapWord));
1255 }
1256
1257 // Get a measure of how much mileage the method has on it.
1258 int MethodData::mileage_of(Method* method) {
1259 int mileage = 0;
1260 if (TieredCompilation) {
1261 mileage = MAX2(method->invocation_count(), method->backedge_count());
1262 } else {
1263 int iic = method->interpreter_invocation_count();
1264 if (mileage < iic) mileage = iic;
1265 MethodCounters* mcs = method->method_counters();
1266 if (mcs != NULL) {
1267 InvocationCounter* ic = mcs->invocation_counter();
1268 InvocationCounter* bc = mcs->backedge_counter();
1269 int icval = ic->count();
1270 if (ic->carry()) icval += CompileThreshold;
1271 if (mileage < icval) mileage = icval;
1272 int bcval = bc->count();
1273 if (bc->carry()) bcval += CompileThreshold;
1274 if (mileage < bcval) mileage = bcval;
1275 }
1276 }
1277 return mileage;
1278 }
1279
1280 bool MethodData::is_mature() const {
1281 return CompilationPolicy::policy()->is_mature(_method);
1282 }
1283
1284 // Translate a bci to its corresponding data index (di).
1285 address MethodData::bci_to_dp(int bci) {
1286 ResourceMark rm;
1287 ProfileData* data = data_before(bci);
1288 ProfileData* prev = NULL;
1289 for ( ; is_valid(data); data = next_data(data)) {
1290 if (data->bci() >= bci) {
1291 if (data->bci() == bci) set_hint_di(dp_to_di(data->dp()));
1292 else if (prev != NULL) set_hint_di(dp_to_di(prev->dp()));
1293 return data->dp();
1294 }
1295 prev = data;
1296 }
1297 return (address)limit_data_position();
1298 }
1299
1300 // Translate a bci to its corresponding data, or NULL.
1301 ProfileData* MethodData::bci_to_data(int bci) {
1302 ProfileData* data = data_before(bci);
1303 for ( ; is_valid(data); data = next_data(data)) {
1304 if (data->bci() == bci) {
1305 set_hint_di(dp_to_di(data->dp()));
1306 return data;
1307 } else if (data->bci() > bci) {
1308 break;
1309 }
1310 }
1311 return bci_to_extra_data(bci, NULL, false);
1312 }
1313
1314 DataLayout* MethodData::next_extra(DataLayout* dp) {
1315 int nb_cells = 0;
1316 switch(dp->tag()) {
1317 case DataLayout::bit_data_tag:
1318 case DataLayout::no_tag:
1319 nb_cells = BitData::static_cell_count();
1320 break;
1321 case DataLayout::speculative_trap_data_tag:
1322 nb_cells = SpeculativeTrapData::static_cell_count();
1323 break;
1324 default:
1325 fatal(err_msg("unexpected tag %d", dp->tag()));
1326 }
1327 return (DataLayout*)((address)dp + DataLayout::compute_size_in_bytes(nb_cells));
1328 }
1329
1330 ProfileData* MethodData::bci_to_extra_data_helper(int bci, Method* m, DataLayout*& dp, bool concurrent) {
1331 DataLayout* end = args_data_limit();
1332
1333 for (;; dp = next_extra(dp)) {
1334 assert(dp < end, "moved past end of extra data");
1335 // No need for "OrderAccess::load_acquire" ops,
1336 // since the data structure is monotonic.
1337 switch(dp->tag()) {
1338 case DataLayout::no_tag:
1339 return NULL;
1340 case DataLayout::arg_info_data_tag:
1341 dp = end;
1342 return NULL; // ArgInfoData is at the end of extra data section.
1343 case DataLayout::bit_data_tag:
1344 if (m == NULL && dp->bci() == bci) {
1345 return new BitData(dp);
1346 }
1347 break;
1348 case DataLayout::speculative_trap_data_tag:
1349 if (m != NULL) {
1350 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1351 // data->method() may be null in case of a concurrent
1352 // allocation. Maybe it's for the same method. Try to use that
1353 // entry in that case.
1354 if (dp->bci() == bci) {
1355 if (data->method() == NULL) {
1356 assert(concurrent, "impossible because no concurrent allocation");
1357 return NULL;
1358 } else if (data->method() == m) {
1359 return data;
1360 }
1361 }
1362 }
1363 break;
1364 default:
1365 fatal(err_msg("unexpected tag %d", dp->tag()));
1366 }
1367 }
1368 return NULL;
1369 }
1370
1371
1372 // Translate a bci to its corresponding extra data, or NULL.
1373 ProfileData* MethodData::bci_to_extra_data(int bci, Method* m, bool create_if_missing) {
1374 // This code assumes an entry for a SpeculativeTrapData is 2 cells
1375 assert(2*DataLayout::compute_size_in_bytes(BitData::static_cell_count()) ==
1376 DataLayout::compute_size_in_bytes(SpeculativeTrapData::static_cell_count()),
1377 "code needs to be adjusted");
1378
1379 // Do not create one of these if method has been redefined.
1380 if (m != NULL && m->is_old()) {
1381 return NULL;
1382 }
1383
1384 DataLayout* dp = extra_data_base();
1385 DataLayout* end = args_data_limit();
1386
1387 // Allocation in the extra data space has to be atomic because not
1388 // all entries have the same size and non atomic concurrent
1389 // allocation would result in a corrupted extra data space.
1390 ProfileData* result = bci_to_extra_data_helper(bci, m, dp, true);
1391 if (result != NULL) {
1392 return result;
1393 }
1394
1395 if (create_if_missing && dp < end) {
1396 MutexLocker ml(&_extra_data_lock);
1397 // Check again now that we have the lock. Another thread may
1398 // have added extra data entries.
1399 ProfileData* result = bci_to_extra_data_helper(bci, m, dp, false);
1400 if (result != NULL || dp >= end) {
1401 return result;
1402 }
1403
1404 assert(dp->tag() == DataLayout::no_tag || (dp->tag() == DataLayout::speculative_trap_data_tag && m != NULL), "should be free");
1405 assert(next_extra(dp)->tag() == DataLayout::no_tag || next_extra(dp)->tag() == DataLayout::arg_info_data_tag, "should be free or arg info");
1406 u1 tag = m == NULL ? DataLayout::bit_data_tag : DataLayout::speculative_trap_data_tag;
1407 // SpeculativeTrapData is 2 slots. Make sure we have room.
1408 if (m != NULL && next_extra(dp)->tag() != DataLayout::no_tag) {
1409 return NULL;
1410 }
1411 DataLayout temp;
1412 temp.initialize(tag, bci, 0);
1413
1414 dp->set_header(temp.header());
1415 assert(dp->tag() == tag, "sane");
1416 assert(dp->bci() == bci, "no concurrent allocation");
1417 if (tag == DataLayout::bit_data_tag) {
1418 return new BitData(dp);
1419 } else {
1420 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1421 data->set_method(m);
1422 return data;
1423 }
1424 }
1425 return NULL;
1426 }
1427
1428 ArgInfoData *MethodData::arg_info() {
1429 DataLayout* dp = extra_data_base();
1430 DataLayout* end = args_data_limit();
1431 for (; dp < end; dp = next_extra(dp)) {
1432 if (dp->tag() == DataLayout::arg_info_data_tag)
1433 return new ArgInfoData(dp);
1434 }
1435 return NULL;
1436 }
1437
1438 // Printing
1439
1440 void MethodData::print_on(outputStream* st) const {
1441 assert(is_methodData(), "should be method data");
1442 st->print("method data for ");
1443 method()->print_value_on(st);
1444 st->cr();
1445 print_data_on(st);
1446 }
1447
1448 void MethodData::print_value_on(outputStream* st) const {
1449 assert(is_methodData(), "should be method data");
1450 st->print("method data for ");
1451 method()->print_value_on(st);
1452 }
1453
1454 void MethodData::print_data_on(outputStream* st) const {
1455 ResourceMark rm;
1456 ProfileData* data = first_data();
1457 if (_parameters_type_data_di != no_parameters) {
1458 parameters_type_data()->print_data_on(st);
1459 }
1460 for ( ; is_valid(data); data = next_data(data)) {
1461 st->print("%d", dp_to_di(data->dp()));
1462 st->fill_to(6);
1463 data->print_data_on(st, this);
1464 }
1465 st->print_cr("--- Extra data:");
1466 DataLayout* dp = extra_data_base();
1467 DataLayout* end = args_data_limit();
1468 for (;; dp = next_extra(dp)) {
1469 assert(dp < end, "moved past end of extra data");
1470 // No need for "OrderAccess::load_acquire" ops,
1471 // since the data structure is monotonic.
1472 switch(dp->tag()) {
1473 case DataLayout::no_tag:
1474 continue;
1475 case DataLayout::bit_data_tag:
1476 data = new BitData(dp);
1477 break;
1478 case DataLayout::speculative_trap_data_tag:
1479 data = new SpeculativeTrapData(dp);
1480 break;
1481 case DataLayout::arg_info_data_tag:
1482 data = new ArgInfoData(dp);
1483 dp = end; // ArgInfoData is at the end of extra data section.
1484 break;
1485 default:
1486 fatal(err_msg("unexpected tag %d", dp->tag()));
1487 }
1488 st->print("%d", dp_to_di(data->dp()));
1489 st->fill_to(6);
1490 data->print_data_on(st);
1491 if (dp >= end) return;
1492 }
1493 }
1494
1495 #if INCLUDE_SERVICES
1496 // Size Statistics
1497 void MethodData::collect_statistics(KlassSizeStats *sz) const {
1498 int n = sz->count(this);
1499 sz->_method_data_bytes += n;
1500 sz->_method_all_bytes += n;
1501 sz->_rw_bytes += n;
1502 }
1503 #endif // INCLUDE_SERVICES
1504
1505 // Verification
1506
1507 void MethodData::verify_on(outputStream* st) {
1508 guarantee(is_methodData(), "object must be method data");
1509 // guarantee(m->is_perm(), "should be in permspace");
1510 this->verify_data_on(st);
1511 }
1512
1513 void MethodData::verify_data_on(outputStream* st) {
1514 NEEDS_CLEANUP;
1515 // not yet implemented.
1516 }
1517
1518 bool MethodData::profile_jsr292(methodHandle m, int bci) {
1519 if (m->is_compiled_lambda_form()) {
1520 return true;
1521 }
1522
1523 Bytecode_invoke inv(m , bci);
1524 return inv.is_invokedynamic() || inv.is_invokehandle();
1525 }
1526
1527 int MethodData::profile_arguments_flag() {
1528 return TypeProfileLevel % 10;
1529 }
1530
1531 bool MethodData::profile_arguments() {
1532 return profile_arguments_flag() > no_type_profile && profile_arguments_flag() <= type_profile_all;
1533 }
1534
1535 bool MethodData::profile_arguments_jsr292_only() {
1536 return profile_arguments_flag() == type_profile_jsr292;
1537 }
1538
1539 bool MethodData::profile_all_arguments() {
1540 return profile_arguments_flag() == type_profile_all;
1541 }
1542
1543 bool MethodData::profile_arguments_for_invoke(methodHandle m, int bci) {
1544 if (!profile_arguments()) {
1545 return false;
1546 }
1547
1548 if (profile_all_arguments()) {
1549 return true;
1550 }
1551
1552 assert(profile_arguments_jsr292_only(), "inconsistent");
1553 return profile_jsr292(m, bci);
1554 }
1555
1556 int MethodData::profile_return_flag() {
1557 return (TypeProfileLevel % 100) / 10;
1558 }
1559
1560 bool MethodData::profile_return() {
1561 return profile_return_flag() > no_type_profile && profile_return_flag() <= type_profile_all;
1562 }
1563
1564 bool MethodData::profile_return_jsr292_only() {
1565 return profile_return_flag() == type_profile_jsr292;
1566 }
1567
1568 bool MethodData::profile_all_return() {
1569 return profile_return_flag() == type_profile_all;
1570 }
1571
1572 bool MethodData::profile_return_for_invoke(methodHandle m, int bci) {
1573 if (!profile_return()) {
1574 return false;
1575 }
1576
1577 if (profile_all_return()) {
1578 return true;
1579 }
1580
1581 assert(profile_return_jsr292_only(), "inconsistent");
1582 return profile_jsr292(m, bci);
1583 }
1584
1585 int MethodData::profile_parameters_flag() {
1586 return TypeProfileLevel / 100;
1587 }
1588
1589 bool MethodData::profile_parameters() {
1590 return profile_parameters_flag() > no_type_profile && profile_parameters_flag() <= type_profile_all;
1591 }
1592
1593 bool MethodData::profile_parameters_jsr292_only() {
1594 return profile_parameters_flag() == type_profile_jsr292;
1595 }
1596
1597 bool MethodData::profile_all_parameters() {
1598 return profile_parameters_flag() == type_profile_all;
1599 }
1600
1601 bool MethodData::profile_parameters_for_method(methodHandle m) {
1602 if (!profile_parameters()) {
1603 return false;
1604 }
1605
1606 if (profile_all_parameters()) {
1607 return true;
1608 }
1609
1610 assert(profile_parameters_jsr292_only(), "inconsistent");
1611 return m->is_compiled_lambda_form();
1612 }
1613
1614 void MethodData::clean_extra_data_helper(DataLayout* dp, int shift, bool reset) {
1615 if (shift == 0) {
1616 return;
1617 }
1618 if (!reset) {
1619 // Move all cells of trap entry at dp left by "shift" cells
1620 intptr_t* start = (intptr_t*)dp;
1621 intptr_t* end = (intptr_t*)next_extra(dp);
1622 for (intptr_t* ptr = start; ptr < end; ptr++) {
1623 *(ptr-shift) = *ptr;
1624 }
1625 } else {
1626 // Reset "shift" cells stopping at dp
1627 intptr_t* start = ((intptr_t*)dp) - shift;
1628 intptr_t* end = (intptr_t*)dp;
1629 for (intptr_t* ptr = start; ptr < end; ptr++) {
1630 *ptr = 0;
1631 }
1632 }
1633 }
1634
1635 class CleanExtraDataClosure : public StackObj {
1636 public:
1637 virtual bool is_live(Method* m) = 0;
1638 };
1639
1640 // Check for entries that reference an unloaded method
1641 class CleanExtraDataKlassClosure : public CleanExtraDataClosure {
1642 private:
1643 BoolObjectClosure* _is_alive;
1644 public:
1645 CleanExtraDataKlassClosure(BoolObjectClosure* is_alive) : _is_alive(is_alive) {}
1646 bool is_live(Method* m) {
1647 return m->method_holder()->is_loader_alive(_is_alive);
1648 }
1649 };
1650
1651 // Check for entries that reference a redefined method
1652 class CleanExtraDataMethodClosure : public CleanExtraDataClosure {
1653 public:
1654 CleanExtraDataMethodClosure() {}
1655 bool is_live(Method* m) { return !m->is_old(); }
1656 };
1657
1658
1659 // Remove SpeculativeTrapData entries that reference an unloaded or
1660 // redefined method
1661 void MethodData::clean_extra_data(CleanExtraDataClosure* cl) {
1662 DataLayout* dp = extra_data_base();
1663 DataLayout* end = args_data_limit();
1664
1665 int shift = 0;
1666 for (; dp < end; dp = next_extra(dp)) {
1667 switch(dp->tag()) {
1668 case DataLayout::speculative_trap_data_tag: {
1669 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1670 Method* m = data->method();
1671 assert(m != NULL, "should have a method");
1672 if (!cl->is_live(m)) {
1673 // "shift" accumulates the number of cells for dead
1674 // SpeculativeTrapData entries that have been seen so
1675 // far. Following entries must be shifted left by that many
1676 // cells to remove the dead SpeculativeTrapData entries.
1677 shift += (int)((intptr_t*)next_extra(dp) - (intptr_t*)dp);
1678 } else {
1679 // Shift this entry left if it follows dead
1680 // SpeculativeTrapData entries
1681 clean_extra_data_helper(dp, shift);
1682 }
1683 break;
1684 }
1685 case DataLayout::bit_data_tag:
1686 // Shift this entry left if it follows dead SpeculativeTrapData
1687 // entries
1688 clean_extra_data_helper(dp, shift);
1689 continue;
1690 case DataLayout::no_tag:
1691 case DataLayout::arg_info_data_tag:
1692 // We are at end of the live trap entries. The previous "shift"
1693 // cells contain entries that are either dead or were shifted
1694 // left. They need to be reset to no_tag
1695 clean_extra_data_helper(dp, shift, true);
1696 return;
1697 default:
1698 fatal(err_msg("unexpected tag %d", dp->tag()));
1699 }
1700 }
1701 }
1702
1703 // Verify there's no unloaded or redefined method referenced by a
1704 // SpeculativeTrapData entry
1705 void MethodData::verify_extra_data_clean(CleanExtraDataClosure* cl) {
1706 #ifdef ASSERT
1707 DataLayout* dp = extra_data_base();
1708 DataLayout* end = args_data_limit();
1709
1710 for (; dp < end; dp = next_extra(dp)) {
1711 switch(dp->tag()) {
1712 case DataLayout::speculative_trap_data_tag: {
1713 SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1714 Method* m = data->method();
1715 assert(m != NULL && cl->is_live(m), "Method should exist");
1716 break;
1717 }
1718 case DataLayout::bit_data_tag:
1719 continue;
1720 case DataLayout::no_tag:
1721 case DataLayout::arg_info_data_tag:
1722 return;
1723 default:
1724 fatal(err_msg("unexpected tag %d", dp->tag()));
1725 }
1726 }
1727 #endif
1728 }
1729
1730 void MethodData::clean_method_data(BoolObjectClosure* is_alive) {
1731 for (ProfileData* data = first_data();
1732 is_valid(data);
1733 data = next_data(data)) {
1734 data->clean_weak_klass_links(is_alive);
1735 }
1736 ParametersTypeData* parameters = parameters_type_data();
1737 if (parameters != NULL) {
1738 parameters->clean_weak_klass_links(is_alive);
1739 }
1740
1741 CleanExtraDataKlassClosure cl(is_alive);
1742 clean_extra_data(&cl);
1743 verify_extra_data_clean(&cl);
1744 }
1745
1746 void MethodData::clean_weak_method_links() {
1747 for (ProfileData* data = first_data();
1748 is_valid(data);
1749 data = next_data(data)) {
1750 data->clean_weak_method_links();
1751 }
1752
1753 CleanExtraDataMethodClosure cl;
1754 clean_extra_data(&cl);
1755 verify_extra_data_clean(&cl);
1756 }
1757
1758 #ifdef ASSERT
1759 void MethodData::verify_clean_weak_method_links() {
1760 for (ProfileData* data = first_data();
1761 is_valid(data);
1762 data = next_data(data)) {
1763 data->verify_clean_weak_method_links();
1764 }
1765
1766 CleanExtraDataMethodClosure cl;
1767 verify_extra_data_clean(&cl);
1768 }
1769 #endif // ASSERT