1 /*
2 * Copyright (c) 2000, 2024, 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
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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24
25 #ifndef SHARE_OOPS_METHODDATA_HPP
26 #define SHARE_OOPS_METHODDATA_HPP
27
28 #include "interpreter/bytecodes.hpp"
29 #include "interpreter/invocationCounter.hpp"
30 #include "oops/metadata.hpp"
31 #include "oops/method.hpp"
32 #include "oops/oop.hpp"
33 #include "runtime/atomic.hpp"
34 #include "runtime/deoptimization.hpp"
35 #include "runtime/mutex.hpp"
36 #include "utilities/align.hpp"
37 #include "utilities/copy.hpp"
38
39 class BytecodeStream;
40
41 // The MethodData object collects counts and other profile information
42 // during zeroth-tier (interpreter) and third-tier (C1 with full profiling)
43 // execution.
44 //
45 // The profile is used later by compilation heuristics. Some heuristics
46 // enable use of aggressive (or "heroic") optimizations. An aggressive
47 // optimization often has a down-side, a corner case that it handles
48 // poorly, but which is thought to be rare. The profile provides
49 // evidence of this rarity for a given method or even BCI. It allows
50 // the compiler to back out of the optimization at places where it
51 // has historically been a poor choice. Other heuristics try to use
52 // specific information gathered about types observed at a given site.
53 //
54 // All data in the profile is approximate. It is expected to be accurate
55 // on the whole, but the system expects occasional inaccuraces, due to
56 // counter overflow, multiprocessor races during data collection, space
57 // limitations, missing MDO blocks, etc. Bad or missing data will degrade
58 // optimization quality but will not affect correctness. Also, each MDO
59 // is marked with its birth-date ("creation_mileage") which can be used
60 // to assess the quality ("maturity") of its data.
61 //
62 // Short (<32-bit) counters are designed to overflow to a known "saturated"
63 // state. Also, certain recorded per-BCI events are given one-bit counters
64 // which overflow to a saturated state which applied to all counters at
65 // that BCI. In other words, there is a small lattice which approximates
66 // the ideal of an infinite-precision counter for each event at each BCI,
67 // and the lattice quickly "bottoms out" in a state where all counters
68 // are taken to be indefinitely large.
69 //
70 // The reader will find many data races in profile gathering code, starting
71 // with invocation counter incrementation. None of these races harm correct
72 // execution of the compiled code.
73
74 // forward decl
75 class ProfileData;
76
77 // DataLayout
78 //
79 // Overlay for generic profiling data.
80 class DataLayout {
81 friend class VMStructs;
82 friend class JVMCIVMStructs;
83
84 private:
85 // Every data layout begins with a header. This header
86 // contains a tag, which is used to indicate the size/layout
87 // of the data, 8 bits of flags, which can be used in any way,
88 // 32 bits of trap history (none/one reason/many reasons),
89 // and a bci, which is used to tie this piece of data to a
90 // specific bci in the bytecodes.
91 union {
92 u8 _bits;
93 struct {
94 u1 _tag;
95 u1 _flags;
96 u2 _bci;
97 u4 _traps;
98 } _struct;
99 } _header;
100
101 // The data layout has an arbitrary number of cells, each sized
102 // to accommodate a pointer or an integer.
103 intptr_t _cells[1];
104
105 // Some types of data layouts need a length field.
106 static bool needs_array_len(u1 tag);
107
108 public:
109 enum {
110 counter_increment = 1
111 };
112
113 enum {
114 cell_size = sizeof(intptr_t)
115 };
116
117 // Tag values
118 enum : u1 {
119 no_tag,
120 bit_data_tag,
121 counter_data_tag,
122 jump_data_tag,
123 receiver_type_data_tag,
124 virtual_call_data_tag,
125 ret_data_tag,
126 branch_data_tag,
127 multi_branch_data_tag,
128 arg_info_data_tag,
129 call_type_data_tag,
130 virtual_call_type_data_tag,
131 parameters_type_data_tag,
132 speculative_trap_data_tag
133 };
134
135 enum {
136 // The trap state breaks down as [recompile:1 | reason:31].
137 // This further breakdown is defined in deoptimization.cpp.
138 // See Deoptimization::trap_state_reason for an assert that
139 // trap_bits is big enough to hold reasons < Reason_RECORDED_LIMIT.
140 //
141 // The trap_state is collected only if ProfileTraps is true.
142 trap_bits = 1+31, // 31: enough to distinguish [0..Reason_RECORDED_LIMIT].
143 trap_mask = -1,
144 first_flag = 0
145 };
146
147 // Size computation
148 static int header_size_in_bytes() {
149 return header_size_in_cells() * cell_size;
150 }
151 static int header_size_in_cells() {
152 return LP64_ONLY(1) NOT_LP64(2);
153 }
154
155 static int compute_size_in_bytes(int cell_count) {
156 return header_size_in_bytes() + cell_count * cell_size;
157 }
158
159 // Initialization
160 void initialize(u1 tag, u2 bci, int cell_count);
161
162 // Accessors
163 u1 tag() {
164 return _header._struct._tag;
165 }
166
167 // Return 32 bits of trap state.
168 // The state tells if traps with zero, one, or many reasons have occurred.
169 // It also tells whether zero or many recompilations have occurred.
170 // The associated trap histogram in the MDO itself tells whether
171 // traps are common or not. If a BCI shows that a trap X has
172 // occurred, and the MDO shows N occurrences of X, we make the
173 // simplifying assumption that all N occurrences can be blamed
174 // on that BCI.
175 uint trap_state() const {
176 return _header._struct._traps;
177 }
178
179 void set_trap_state(uint new_state) {
180 assert(ProfileTraps, "used only under +ProfileTraps");
181 uint old_flags = _header._struct._traps;
182 _header._struct._traps = new_state | old_flags;
183 }
184
185 u1 flags() const {
186 return Atomic::load_acquire(&_header._struct._flags);
187 }
188
189 u2 bci() const {
190 return _header._struct._bci;
191 }
192
193 void set_header(u8 value) {
194 _header._bits = value;
195 }
196 u8 header() {
197 return _header._bits;
198 }
199 void set_cell_at(int index, intptr_t value) {
200 _cells[index] = value;
201 }
202 void release_set_cell_at(int index, intptr_t value);
203 intptr_t cell_at(int index) const {
204 return _cells[index];
205 }
206
207 bool set_flag_at(u1 flag_number) {
208 const u1 bit = 1 << flag_number;
209 u1 compare_value;
210 do {
211 compare_value = _header._struct._flags;
212 if ((compare_value & bit) == bit) {
213 // already set.
214 return false;
215 }
216 } while (compare_value != Atomic::cmpxchg(&_header._struct._flags, compare_value, static_cast<u1>(compare_value | bit)));
217 return true;
218 }
219
220 bool clear_flag_at(u1 flag_number) {
221 const u1 bit = 1 << flag_number;
222 u1 compare_value;
223 u1 exchange_value;
224 do {
225 compare_value = _header._struct._flags;
226 if ((compare_value & bit) == 0) {
227 // already cleaed.
228 return false;
229 }
230 exchange_value = compare_value & ~bit;
231 } while (compare_value != Atomic::cmpxchg(&_header._struct._flags, compare_value, exchange_value));
232 return true;
233 }
234
235 bool flag_at(u1 flag_number) const {
236 return (flags() & (1 << flag_number)) != 0;
237 }
238
239 // Low-level support for code generation.
240 static ByteSize header_offset() {
241 return byte_offset_of(DataLayout, _header);
242 }
243 static ByteSize tag_offset() {
244 return byte_offset_of(DataLayout, _header._struct._tag);
245 }
246 static ByteSize flags_offset() {
247 return byte_offset_of(DataLayout, _header._struct._flags);
248 }
249 static ByteSize bci_offset() {
250 return byte_offset_of(DataLayout, _header._struct._bci);
251 }
252 static ByteSize cell_offset(int index) {
253 return byte_offset_of(DataLayout, _cells) + in_ByteSize(index * cell_size);
254 }
255 // Return a value which, when or-ed as a byte into _flags, sets the flag.
256 static u1 flag_number_to_constant(u1 flag_number) {
257 DataLayout temp; temp.set_header(0);
258 temp.set_flag_at(flag_number);
259 return temp._header._struct._flags;
260 }
261 // Return a value which, when or-ed as a word into _header, sets the flag.
262 static u8 flag_mask_to_header_mask(u1 byte_constant) {
263 DataLayout temp; temp.set_header(0);
264 temp._header._struct._flags = byte_constant;
265 return temp._header._bits;
266 }
267
268 ProfileData* data_in();
269
270 int size_in_bytes() {
271 int cells = cell_count();
272 assert(cells >= 0, "invalid number of cells");
273 return DataLayout::compute_size_in_bytes(cells);
274 }
275 int cell_count();
276
277 // GC support
278 void clean_weak_klass_links(bool always_clean);
279 };
280
281
282 // ProfileData class hierarchy
283 class ProfileData;
284 class BitData;
285 class CounterData;
286 class ReceiverTypeData;
287 class VirtualCallData;
288 class VirtualCallTypeData;
289 class RetData;
290 class CallTypeData;
291 class JumpData;
292 class BranchData;
293 class ArrayData;
294 class MultiBranchData;
295 class ArgInfoData;
296 class ParametersTypeData;
297 class SpeculativeTrapData;
298
299 // ProfileData
300 //
301 // A ProfileData object is created to refer to a section of profiling
302 // data in a structured way.
303 class ProfileData : public ResourceObj {
304 friend class TypeEntries;
305 friend class ReturnTypeEntry;
306 friend class TypeStackSlotEntries;
307 private:
308 enum {
309 tab_width_one = 16,
310 tab_width_two = 36
311 };
312
313 // This is a pointer to a section of profiling data.
314 DataLayout* _data;
315
316 char* print_data_on_helper(const MethodData* md) const;
317
318 protected:
319 DataLayout* data() { return _data; }
320 const DataLayout* data() const { return _data; }
321
322 enum {
323 cell_size = DataLayout::cell_size
324 };
325
326 public:
327 // How many cells are in this?
328 virtual int cell_count() const {
329 ShouldNotReachHere();
330 return -1;
331 }
332
333 // Return the size of this data.
334 int size_in_bytes() {
335 return DataLayout::compute_size_in_bytes(cell_count());
336 }
337
338 protected:
339 // Low-level accessors for underlying data
340 void set_intptr_at(int index, intptr_t value) {
341 assert(0 <= index && index < cell_count(), "oob");
342 data()->set_cell_at(index, value);
343 }
344 void release_set_intptr_at(int index, intptr_t value);
345 intptr_t intptr_at(int index) const {
346 assert(0 <= index && index < cell_count(), "oob");
347 return data()->cell_at(index);
348 }
349 void set_uint_at(int index, uint value) {
350 set_intptr_at(index, (intptr_t) value);
351 }
352 void release_set_uint_at(int index, uint value);
353 uint uint_at(int index) const {
354 return (uint)intptr_at(index);
355 }
356 void set_int_at(int index, int value) {
357 set_intptr_at(index, (intptr_t) value);
358 }
359 void release_set_int_at(int index, int value);
360 int int_at(int index) const {
361 return (int)intptr_at(index);
362 }
363 int int_at_unchecked(int index) const {
364 return (int)data()->cell_at(index);
365 }
366 void set_oop_at(int index, oop value) {
367 set_intptr_at(index, cast_from_oop<intptr_t>(value));
368 }
369 oop oop_at(int index) const {
370 return cast_to_oop(intptr_at(index));
371 }
372
373 void set_flag_at(u1 flag_number) {
374 data()->set_flag_at(flag_number);
375 }
376 bool flag_at(u1 flag_number) const {
377 return data()->flag_at(flag_number);
378 }
379
380 // two convenient imports for use by subclasses:
381 static ByteSize cell_offset(int index) {
382 return DataLayout::cell_offset(index);
383 }
384 static u1 flag_number_to_constant(u1 flag_number) {
385 return DataLayout::flag_number_to_constant(flag_number);
386 }
387
388 ProfileData(DataLayout* data) {
389 _data = data;
390 }
391
392 public:
393 // Constructor for invalid ProfileData.
394 ProfileData();
395
396 u2 bci() const {
397 return data()->bci();
398 }
399
400 address dp() {
401 return (address)_data;
402 }
403
404 int trap_state() const {
405 return data()->trap_state();
406 }
407 void set_trap_state(int new_state) {
408 data()->set_trap_state(new_state);
409 }
410
411 // Type checking
412 virtual bool is_BitData() const { return false; }
413 virtual bool is_CounterData() const { return false; }
414 virtual bool is_JumpData() const { return false; }
415 virtual bool is_ReceiverTypeData()const { return false; }
416 virtual bool is_VirtualCallData() const { return false; }
417 virtual bool is_RetData() const { return false; }
418 virtual bool is_BranchData() const { return false; }
419 virtual bool is_ArrayData() const { return false; }
420 virtual bool is_MultiBranchData() const { return false; }
421 virtual bool is_ArgInfoData() const { return false; }
422 virtual bool is_CallTypeData() const { return false; }
423 virtual bool is_VirtualCallTypeData()const { return false; }
424 virtual bool is_ParametersTypeData() const { return false; }
425 virtual bool is_SpeculativeTrapData()const { return false; }
426
427
428 BitData* as_BitData() const {
429 assert(is_BitData(), "wrong type");
430 return is_BitData() ? (BitData*) this : nullptr;
431 }
432 CounterData* as_CounterData() const {
433 assert(is_CounterData(), "wrong type");
434 return is_CounterData() ? (CounterData*) this : nullptr;
435 }
436 JumpData* as_JumpData() const {
437 assert(is_JumpData(), "wrong type");
438 return is_JumpData() ? (JumpData*) this : nullptr;
439 }
440 ReceiverTypeData* as_ReceiverTypeData() const {
441 assert(is_ReceiverTypeData(), "wrong type");
442 return is_ReceiverTypeData() ? (ReceiverTypeData*)this : nullptr;
443 }
444 VirtualCallData* as_VirtualCallData() const {
445 assert(is_VirtualCallData(), "wrong type");
446 return is_VirtualCallData() ? (VirtualCallData*)this : nullptr;
447 }
448 RetData* as_RetData() const {
449 assert(is_RetData(), "wrong type");
450 return is_RetData() ? (RetData*) this : nullptr;
451 }
452 BranchData* as_BranchData() const {
453 assert(is_BranchData(), "wrong type");
454 return is_BranchData() ? (BranchData*) this : nullptr;
455 }
456 ArrayData* as_ArrayData() const {
457 assert(is_ArrayData(), "wrong type");
458 return is_ArrayData() ? (ArrayData*) this : nullptr;
459 }
460 MultiBranchData* as_MultiBranchData() const {
461 assert(is_MultiBranchData(), "wrong type");
462 return is_MultiBranchData() ? (MultiBranchData*)this : nullptr;
463 }
464 ArgInfoData* as_ArgInfoData() const {
465 assert(is_ArgInfoData(), "wrong type");
466 return is_ArgInfoData() ? (ArgInfoData*)this : nullptr;
467 }
468 CallTypeData* as_CallTypeData() const {
469 assert(is_CallTypeData(), "wrong type");
470 return is_CallTypeData() ? (CallTypeData*)this : nullptr;
471 }
472 VirtualCallTypeData* as_VirtualCallTypeData() const {
473 assert(is_VirtualCallTypeData(), "wrong type");
474 return is_VirtualCallTypeData() ? (VirtualCallTypeData*)this : nullptr;
475 }
476 ParametersTypeData* as_ParametersTypeData() const {
477 assert(is_ParametersTypeData(), "wrong type");
478 return is_ParametersTypeData() ? (ParametersTypeData*)this : nullptr;
479 }
480 SpeculativeTrapData* as_SpeculativeTrapData() const {
481 assert(is_SpeculativeTrapData(), "wrong type");
482 return is_SpeculativeTrapData() ? (SpeculativeTrapData*)this : nullptr;
483 }
484
485
486 // Subclass specific initialization
487 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo) {}
488
489 // GC support
490 virtual void clean_weak_klass_links(bool always_clean) {}
491
492 // CI translation: ProfileData can represent both MethodDataOop data
493 // as well as CIMethodData data. This function is provided for translating
494 // an oop in a ProfileData to the ci equivalent. Generally speaking,
495 // most ProfileData don't require any translation, so we provide the null
496 // translation here, and the required translators are in the ci subclasses.
497 virtual void translate_from(const ProfileData* data) {}
498
499 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const {
500 ShouldNotReachHere();
501 }
502
503 void print_data_on(outputStream* st, const MethodData* md) const;
504
505 void print_shared(outputStream* st, const char* name, const char* extra) const;
506 void tab(outputStream* st, bool first = false) const;
507 };
508
509 // BitData
510 //
511 // A BitData holds a flag or two in its header.
512 class BitData : public ProfileData {
513 friend class VMStructs;
514 friend class JVMCIVMStructs;
515 protected:
516 enum : u1 {
517 // null_seen:
518 // saw a null operand (cast/aastore/instanceof)
519 null_seen_flag = DataLayout::first_flag + 0,
520 exception_handler_entered_flag = null_seen_flag + 1,
521 deprecated_method_callsite_flag = exception_handler_entered_flag + 1
522 #if INCLUDE_JVMCI
523 // bytecode threw any exception
524 , exception_seen_flag = deprecated_method_callsite_flag + 1
525 #endif
526 };
527 enum { bit_cell_count = 0 }; // no additional data fields needed.
528 public:
529 BitData(DataLayout* layout) : ProfileData(layout) {
530 }
531
532 virtual bool is_BitData() const { return true; }
533
534 static int static_cell_count() {
535 return bit_cell_count;
536 }
537
538 virtual int cell_count() const {
539 return static_cell_count();
540 }
541
542 // Accessor
543
544 // The null_seen flag bit is specially known to the interpreter.
545 // Consulting it allows the compiler to avoid setting up null_check traps.
546 bool null_seen() { return flag_at(null_seen_flag); }
547 void set_null_seen() { set_flag_at(null_seen_flag); }
548 bool deprecated_method_call_site() const { return flag_at(deprecated_method_callsite_flag); }
549 bool set_deprecated_method_call_site() { return data()->set_flag_at(deprecated_method_callsite_flag); }
550 bool clear_deprecated_method_call_site() { return data()->clear_flag_at(deprecated_method_callsite_flag); }
551
552 #if INCLUDE_JVMCI
553 // true if an exception was thrown at the specific BCI
554 bool exception_seen() { return flag_at(exception_seen_flag); }
555 void set_exception_seen() { set_flag_at(exception_seen_flag); }
556 #endif
557
558 // true if a ex handler block at this bci was entered
559 bool exception_handler_entered() { return flag_at(exception_handler_entered_flag); }
560 void set_exception_handler_entered() { set_flag_at(exception_handler_entered_flag); }
561
562 // Code generation support
563 static u1 null_seen_byte_constant() {
564 return flag_number_to_constant(null_seen_flag);
565 }
566
567 static ByteSize bit_data_size() {
568 return cell_offset(bit_cell_count);
569 }
570
571 void print_data_on(outputStream* st, const char* extra = nullptr) const;
572 };
573
574 // CounterData
575 //
576 // A CounterData corresponds to a simple counter.
577 class CounterData : public BitData {
578 friend class VMStructs;
579 friend class JVMCIVMStructs;
580 protected:
581 enum {
582 count_off,
583 counter_cell_count
584 };
585 public:
586 CounterData(DataLayout* layout) : BitData(layout) {}
587
588 virtual bool is_CounterData() const { return true; }
589
590 static int static_cell_count() {
591 return counter_cell_count;
592 }
593
594 virtual int cell_count() const {
595 return static_cell_count();
596 }
597
598 // Direct accessor
599 int count() const {
600 intptr_t raw_data = intptr_at(count_off);
601 if (raw_data > max_jint) {
602 raw_data = max_jint;
603 } else if (raw_data < min_jint) {
604 raw_data = min_jint;
605 }
606 return int(raw_data);
607 }
608
609 // Code generation support
610 static ByteSize count_offset() {
611 return cell_offset(count_off);
612 }
613 static ByteSize counter_data_size() {
614 return cell_offset(counter_cell_count);
615 }
616
617 void set_count(int count) {
618 set_int_at(count_off, count);
619 }
620
621 void print_data_on(outputStream* st, const char* extra = nullptr) const;
622 };
623
624 // JumpData
625 //
626 // A JumpData is used to access profiling information for a direct
627 // branch. It is a counter, used for counting the number of branches,
628 // plus a data displacement, used for realigning the data pointer to
629 // the corresponding target bci.
630 class JumpData : public ProfileData {
631 friend class VMStructs;
632 friend class JVMCIVMStructs;
633 protected:
634 enum {
635 taken_off_set,
636 displacement_off_set,
637 jump_cell_count
638 };
639
640 void set_displacement(int displacement) {
641 set_int_at(displacement_off_set, displacement);
642 }
643
644 public:
645 JumpData(DataLayout* layout) : ProfileData(layout) {
646 assert(layout->tag() == DataLayout::jump_data_tag ||
647 layout->tag() == DataLayout::branch_data_tag, "wrong type");
648 }
649
650 virtual bool is_JumpData() const { return true; }
651
652 static int static_cell_count() {
653 return jump_cell_count;
654 }
655
656 virtual int cell_count() const {
657 return static_cell_count();
658 }
659
660 // Direct accessor
661 uint taken() const {
662 return uint_at(taken_off_set);
663 }
664
665 void set_taken(uint cnt) {
666 set_uint_at(taken_off_set, cnt);
667 }
668
669 // Saturating counter
670 uint inc_taken() {
671 uint cnt = taken() + 1;
672 // Did we wrap? Will compiler screw us??
673 if (cnt == 0) cnt--;
674 set_uint_at(taken_off_set, cnt);
675 return cnt;
676 }
677
678 int displacement() const {
679 return int_at(displacement_off_set);
680 }
681
682 // Code generation support
683 static ByteSize taken_offset() {
684 return cell_offset(taken_off_set);
685 }
686
687 static ByteSize displacement_offset() {
688 return cell_offset(displacement_off_set);
689 }
690
691 // Specific initialization.
692 void post_initialize(BytecodeStream* stream, MethodData* mdo);
693
694 void print_data_on(outputStream* st, const char* extra = nullptr) const;
695 };
696
697 // Entries in a ProfileData object to record types: it can either be
698 // none (no profile), unknown (conflicting profile data) or a klass if
699 // a single one is seen. Whether a null reference was seen is also
700 // recorded. No counter is associated with the type and a single type
701 // is tracked (unlike VirtualCallData).
702 class TypeEntries {
703
704 public:
705
706 // A single cell is used to record information for a type:
707 // - the cell is initialized to 0
708 // - when a type is discovered it is stored in the cell
709 // - bit zero of the cell is used to record whether a null reference
710 // was encountered or not
711 // - bit 1 is set to record a conflict in the type information
712
713 enum {
714 null_seen = 1,
715 type_mask = ~null_seen,
716 type_unknown = 2,
717 status_bits = null_seen | type_unknown,
718 type_klass_mask = ~status_bits
719 };
720
721 // what to initialize a cell to
722 static intptr_t type_none() {
723 return 0;
724 }
725
726 // null seen = bit 0 set?
727 static bool was_null_seen(intptr_t v) {
728 return (v & null_seen) != 0;
729 }
730
731 // conflicting type information = bit 1 set?
732 static bool is_type_unknown(intptr_t v) {
733 return (v & type_unknown) != 0;
734 }
735
736 // not type information yet = all bits cleared, ignoring bit 0?
737 static bool is_type_none(intptr_t v) {
738 return (v & type_mask) == 0;
739 }
740
741 // recorded type: cell without bit 0 and 1
742 static intptr_t klass_part(intptr_t v) {
743 intptr_t r = v & type_klass_mask;
744 return r;
745 }
746
747 // type recorded
748 static Klass* valid_klass(intptr_t k) {
749 if (!is_type_none(k) &&
750 !is_type_unknown(k)) {
751 Klass* res = (Klass*)klass_part(k);
752 assert(res != nullptr, "invalid");
753 return res;
754 } else {
755 return nullptr;
756 }
757 }
758
759 static intptr_t with_status(intptr_t k, intptr_t in) {
760 return k | (in & status_bits);
761 }
762
763 static intptr_t with_status(Klass* k, intptr_t in) {
764 return with_status((intptr_t)k, in);
765 }
766
767 static void print_klass(outputStream* st, intptr_t k);
768
769 protected:
770 // ProfileData object these entries are part of
771 ProfileData* _pd;
772 // offset within the ProfileData object where the entries start
773 const int _base_off;
774
775 TypeEntries(int base_off)
776 : _pd(nullptr), _base_off(base_off) {}
777
778 void set_intptr_at(int index, intptr_t value) {
779 _pd->set_intptr_at(index, value);
780 }
781
782 intptr_t intptr_at(int index) const {
783 return _pd->intptr_at(index);
784 }
785
786 public:
787 void set_profile_data(ProfileData* pd) {
788 _pd = pd;
789 }
790 };
791
792 // Type entries used for arguments passed at a call and parameters on
793 // method entry. 2 cells per entry: one for the type encoded as in
794 // TypeEntries and one initialized with the stack slot where the
795 // profiled object is to be found so that the interpreter can locate
796 // it quickly.
797 class TypeStackSlotEntries : public TypeEntries {
798
799 private:
800 enum {
801 stack_slot_entry,
802 type_entry,
803 per_arg_cell_count
804 };
805
806 // offset of cell for stack slot for entry i within ProfileData object
807 int stack_slot_offset(int i) const {
808 return _base_off + stack_slot_local_offset(i);
809 }
810
811 const int _number_of_entries;
812
813 // offset of cell for type for entry i within ProfileData object
814 int type_offset_in_cells(int i) const {
815 return _base_off + type_local_offset(i);
816 }
817
818 public:
819
820 TypeStackSlotEntries(int base_off, int nb_entries)
821 : TypeEntries(base_off), _number_of_entries(nb_entries) {}
822
823 static int compute_cell_count(Symbol* signature, bool include_receiver, int max);
824
825 void post_initialize(Symbol* signature, bool has_receiver, bool include_receiver);
826
827 int number_of_entries() const { return _number_of_entries; }
828
829 // offset of cell for stack slot for entry i within this block of cells for a TypeStackSlotEntries
830 static int stack_slot_local_offset(int i) {
831 return i * per_arg_cell_count + stack_slot_entry;
832 }
833
834 // offset of cell for type for entry i within this block of cells for a TypeStackSlotEntries
835 static int type_local_offset(int i) {
836 return i * per_arg_cell_count + type_entry;
837 }
838
839 // stack slot for entry i
840 uint stack_slot(int i) const {
841 assert(i >= 0 && i < _number_of_entries, "oob");
842 return _pd->uint_at(stack_slot_offset(i));
843 }
844
845 // set stack slot for entry i
846 void set_stack_slot(int i, uint num) {
847 assert(i >= 0 && i < _number_of_entries, "oob");
848 _pd->set_uint_at(stack_slot_offset(i), num);
849 }
850
851 // type for entry i
852 intptr_t type(int i) const {
853 assert(i >= 0 && i < _number_of_entries, "oob");
854 return _pd->intptr_at(type_offset_in_cells(i));
855 }
856
857 // set type for entry i
858 void set_type(int i, intptr_t k) {
859 assert(i >= 0 && i < _number_of_entries, "oob");
860 _pd->set_intptr_at(type_offset_in_cells(i), k);
861 }
862
863 static ByteSize per_arg_size() {
864 return in_ByteSize(per_arg_cell_count * DataLayout::cell_size);
865 }
866
867 static int per_arg_count() {
868 return per_arg_cell_count;
869 }
870
871 ByteSize type_offset(int i) const {
872 return DataLayout::cell_offset(type_offset_in_cells(i));
873 }
874
875 // GC support
876 void clean_weak_klass_links(bool always_clean);
877
878 void print_data_on(outputStream* st) const;
879 };
880
881 // Type entry used for return from a call. A single cell to record the
882 // type.
883 class ReturnTypeEntry : public TypeEntries {
884
885 private:
886 enum {
887 cell_count = 1
888 };
889
890 public:
891 ReturnTypeEntry(int base_off)
892 : TypeEntries(base_off) {}
893
894 void post_initialize() {
895 set_type(type_none());
896 }
897
898 intptr_t type() const {
899 return _pd->intptr_at(_base_off);
900 }
901
902 void set_type(intptr_t k) {
903 _pd->set_intptr_at(_base_off, k);
904 }
905
906 static int static_cell_count() {
907 return cell_count;
908 }
909
910 static ByteSize size() {
911 return in_ByteSize(cell_count * DataLayout::cell_size);
912 }
913
914 ByteSize type_offset() {
915 return DataLayout::cell_offset(_base_off);
916 }
917
918 // GC support
919 void clean_weak_klass_links(bool always_clean);
920
921 void print_data_on(outputStream* st) const;
922 };
923
924 // Entries to collect type information at a call: contains arguments
925 // (TypeStackSlotEntries), a return type (ReturnTypeEntry) and a
926 // number of cells. Because the number of cells for the return type is
927 // smaller than the number of cells for the type of an arguments, the
928 // number of cells is used to tell how many arguments are profiled and
929 // whether a return value is profiled. See has_arguments() and
930 // has_return().
931 class TypeEntriesAtCall {
932 private:
933 static int stack_slot_local_offset(int i) {
934 return header_cell_count() + TypeStackSlotEntries::stack_slot_local_offset(i);
935 }
936
937 static int argument_type_local_offset(int i) {
938 return header_cell_count() + TypeStackSlotEntries::type_local_offset(i);
939 }
940
941 public:
942
943 static int header_cell_count() {
944 return 1;
945 }
946
947 static int cell_count_local_offset() {
948 return 0;
949 }
950
951 static int compute_cell_count(BytecodeStream* stream);
952
953 static void initialize(DataLayout* dl, int base, int cell_count) {
954 int off = base + cell_count_local_offset();
955 dl->set_cell_at(off, cell_count - base - header_cell_count());
956 }
957
958 static bool arguments_profiling_enabled();
959 static bool return_profiling_enabled();
960
961 // Code generation support
962 static ByteSize cell_count_offset() {
963 return in_ByteSize(cell_count_local_offset() * DataLayout::cell_size);
964 }
965
966 static ByteSize args_data_offset() {
967 return in_ByteSize(header_cell_count() * DataLayout::cell_size);
968 }
969
970 static ByteSize stack_slot_offset(int i) {
971 return in_ByteSize(stack_slot_local_offset(i) * DataLayout::cell_size);
972 }
973
974 static ByteSize argument_type_offset(int i) {
975 return in_ByteSize(argument_type_local_offset(i) * DataLayout::cell_size);
976 }
977
978 static ByteSize return_only_size() {
979 return ReturnTypeEntry::size() + in_ByteSize(header_cell_count() * DataLayout::cell_size);
980 }
981
982 };
983
984 // CallTypeData
985 //
986 // A CallTypeData is used to access profiling information about a non
987 // virtual call for which we collect type information about arguments
988 // and return value.
989 class CallTypeData : public CounterData {
990 private:
991 // entries for arguments if any
992 TypeStackSlotEntries _args;
993 // entry for return type if any
994 ReturnTypeEntry _ret;
995
996 int cell_count_global_offset() const {
997 return CounterData::static_cell_count() + TypeEntriesAtCall::cell_count_local_offset();
998 }
999
1000 // number of cells not counting the header
1001 int cell_count_no_header() const {
1002 return uint_at(cell_count_global_offset());
1003 }
1004
1005 void check_number_of_arguments(int total) {
1006 assert(number_of_arguments() == total, "should be set in DataLayout::initialize");
1007 }
1008
1009 public:
1010 CallTypeData(DataLayout* layout) :
1011 CounterData(layout),
1012 _args(CounterData::static_cell_count()+TypeEntriesAtCall::header_cell_count(), number_of_arguments()),
1013 _ret(cell_count() - ReturnTypeEntry::static_cell_count())
1014 {
1015 assert(layout->tag() == DataLayout::call_type_data_tag, "wrong type");
1016 // Some compilers (VC++) don't want this passed in member initialization list
1017 _args.set_profile_data(this);
1018 _ret.set_profile_data(this);
1019 }
1020
1021 const TypeStackSlotEntries* args() const {
1022 assert(has_arguments(), "no profiling of arguments");
1023 return &_args;
1024 }
1025
1026 const ReturnTypeEntry* ret() const {
1027 assert(has_return(), "no profiling of return value");
1028 return &_ret;
1029 }
1030
1031 virtual bool is_CallTypeData() const { return true; }
1032
1033 static int static_cell_count() {
1034 return -1;
1035 }
1036
1037 static int compute_cell_count(BytecodeStream* stream) {
1038 return CounterData::static_cell_count() + TypeEntriesAtCall::compute_cell_count(stream);
1039 }
1040
1041 static void initialize(DataLayout* dl, int cell_count) {
1042 TypeEntriesAtCall::initialize(dl, CounterData::static_cell_count(), cell_count);
1043 }
1044
1045 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1046
1047 virtual int cell_count() const {
1048 return CounterData::static_cell_count() +
1049 TypeEntriesAtCall::header_cell_count() +
1050 int_at_unchecked(cell_count_global_offset());
1051 }
1052
1053 int number_of_arguments() const {
1054 return cell_count_no_header() / TypeStackSlotEntries::per_arg_count();
1055 }
1056
1057 void set_argument_type(int i, Klass* k) {
1058 assert(has_arguments(), "no arguments!");
1059 intptr_t current = _args.type(i);
1060 _args.set_type(i, TypeEntries::with_status(k, current));
1061 }
1062
1063 void set_return_type(Klass* k) {
1064 assert(has_return(), "no return!");
1065 intptr_t current = _ret.type();
1066 _ret.set_type(TypeEntries::with_status(k, current));
1067 }
1068
1069 // An entry for a return value takes less space than an entry for an
1070 // argument so if the number of cells exceeds the number of cells
1071 // needed for an argument, this object contains type information for
1072 // at least one argument.
1073 bool has_arguments() const {
1074 bool res = cell_count_no_header() >= TypeStackSlotEntries::per_arg_count();
1075 assert (!res || TypeEntriesAtCall::arguments_profiling_enabled(), "no profiling of arguments");
1076 return res;
1077 }
1078
1079 // An entry for a return value takes less space than an entry for an
1080 // argument, so if the remainder of the number of cells divided by
1081 // the number of cells for an argument is not null, a return value
1082 // is profiled in this object.
1083 bool has_return() const {
1084 bool res = (cell_count_no_header() % TypeStackSlotEntries::per_arg_count()) != 0;
1085 assert (!res || TypeEntriesAtCall::return_profiling_enabled(), "no profiling of return values");
1086 return res;
1087 }
1088
1089 // Code generation support
1090 static ByteSize args_data_offset() {
1091 return cell_offset(CounterData::static_cell_count()) + TypeEntriesAtCall::args_data_offset();
1092 }
1093
1094 ByteSize argument_type_offset(int i) {
1095 return _args.type_offset(i);
1096 }
1097
1098 ByteSize return_type_offset() {
1099 return _ret.type_offset();
1100 }
1101
1102 // GC support
1103 virtual void clean_weak_klass_links(bool always_clean) {
1104 if (has_arguments()) {
1105 _args.clean_weak_klass_links(always_clean);
1106 }
1107 if (has_return()) {
1108 _ret.clean_weak_klass_links(always_clean);
1109 }
1110 }
1111
1112 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1113 };
1114
1115 // ReceiverTypeData
1116 //
1117 // A ReceiverTypeData is used to access profiling information about a
1118 // dynamic type check. It consists of a series of (Klass*, count)
1119 // pairs which are used to store a type profile for the receiver of
1120 // the check, the associated count is incremented every time the type
1121 // is seen. A per ReceiverTypeData counter is incremented on type
1122 // overflow (when there's no more room for a not yet profiled Klass*).
1123 //
1124 class ReceiverTypeData : public CounterData {
1125 friend class VMStructs;
1126 friend class JVMCIVMStructs;
1127 protected:
1128 enum {
1129 receiver0_offset = counter_cell_count,
1130 count0_offset,
1131 receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset
1132 };
1133
1134 public:
1135 ReceiverTypeData(DataLayout* layout) : CounterData(layout) {
1136 assert(layout->tag() == DataLayout::receiver_type_data_tag ||
1137 layout->tag() == DataLayout::virtual_call_data_tag ||
1138 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1139 }
1140
1141 virtual bool is_ReceiverTypeData() const { return true; }
1142
1143 static int static_cell_count() {
1144 return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count;
1145 }
1146
1147 virtual int cell_count() const {
1148 return static_cell_count();
1149 }
1150
1151 // Direct accessors
1152 static uint row_limit() {
1153 return (uint) TypeProfileWidth;
1154 }
1155 static int receiver_cell_index(uint row) {
1156 return receiver0_offset + row * receiver_type_row_cell_count;
1157 }
1158 static int receiver_count_cell_index(uint row) {
1159 return count0_offset + row * receiver_type_row_cell_count;
1160 }
1161
1162 Klass* receiver(uint row) const {
1163 assert(row < row_limit(), "oob");
1164
1165 Klass* recv = (Klass*)intptr_at(receiver_cell_index(row));
1166 assert(recv == nullptr || recv->is_klass(), "wrong type");
1167 return recv;
1168 }
1169
1170 void set_receiver(uint row, Klass* k) {
1171 assert((uint)row < row_limit(), "oob");
1172 set_intptr_at(receiver_cell_index(row), (uintptr_t)k);
1173 }
1174
1175 uint receiver_count(uint row) const {
1176 assert(row < row_limit(), "oob");
1177 return uint_at(receiver_count_cell_index(row));
1178 }
1179
1180 void set_receiver_count(uint row, uint count) {
1181 assert(row < row_limit(), "oob");
1182 set_uint_at(receiver_count_cell_index(row), count);
1183 }
1184
1185 void clear_row(uint row) {
1186 assert(row < row_limit(), "oob");
1187 // Clear total count - indicator of polymorphic call site.
1188 // The site may look like as monomorphic after that but
1189 // it allow to have more accurate profiling information because
1190 // there was execution phase change since klasses were unloaded.
1191 // If the site is still polymorphic then MDO will be updated
1192 // to reflect it. But it could be the case that the site becomes
1193 // only bimorphic. Then keeping total count not 0 will be wrong.
1194 // Even if we use monomorphic (when it is not) for compilation
1195 // we will only have trap, deoptimization and recompile again
1196 // with updated MDO after executing method in Interpreter.
1197 // An additional receiver will be recorded in the cleaned row
1198 // during next call execution.
1199 //
1200 // Note: our profiling logic works with empty rows in any slot.
1201 // We do sorting a profiling info (ciCallProfile) for compilation.
1202 //
1203 set_count(0);
1204 set_receiver(row, nullptr);
1205 set_receiver_count(row, 0);
1206 }
1207
1208 // Code generation support
1209 static ByteSize receiver_offset(uint row) {
1210 return cell_offset(receiver_cell_index(row));
1211 }
1212 static ByteSize receiver_count_offset(uint row) {
1213 return cell_offset(receiver_count_cell_index(row));
1214 }
1215 static ByteSize receiver_type_data_size() {
1216 return cell_offset(static_cell_count());
1217 }
1218
1219 // GC support
1220 virtual void clean_weak_klass_links(bool always_clean);
1221
1222 void print_receiver_data_on(outputStream* st) const;
1223 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1224 };
1225
1226 // VirtualCallData
1227 //
1228 // A VirtualCallData is used to access profiling information about a
1229 // virtual call. For now, it has nothing more than a ReceiverTypeData.
1230 class VirtualCallData : public ReceiverTypeData {
1231 public:
1232 VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) {
1233 assert(layout->tag() == DataLayout::virtual_call_data_tag ||
1234 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1235 }
1236
1237 virtual bool is_VirtualCallData() const { return true; }
1238
1239 static int static_cell_count() {
1240 // At this point we could add more profile state, e.g., for arguments.
1241 // But for now it's the same size as the base record type.
1242 return ReceiverTypeData::static_cell_count();
1243 }
1244
1245 virtual int cell_count() const {
1246 return static_cell_count();
1247 }
1248
1249 // Direct accessors
1250 static ByteSize virtual_call_data_size() {
1251 return cell_offset(static_cell_count());
1252 }
1253
1254 void print_method_data_on(outputStream* st) const NOT_JVMCI_RETURN;
1255 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1256 };
1257
1258 // VirtualCallTypeData
1259 //
1260 // A VirtualCallTypeData is used to access profiling information about
1261 // a virtual call for which we collect type information about
1262 // arguments and return value.
1263 class VirtualCallTypeData : public VirtualCallData {
1264 private:
1265 // entries for arguments if any
1266 TypeStackSlotEntries _args;
1267 // entry for return type if any
1268 ReturnTypeEntry _ret;
1269
1270 int cell_count_global_offset() const {
1271 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::cell_count_local_offset();
1272 }
1273
1274 // number of cells not counting the header
1275 int cell_count_no_header() const {
1276 return uint_at(cell_count_global_offset());
1277 }
1278
1279 void check_number_of_arguments(int total) {
1280 assert(number_of_arguments() == total, "should be set in DataLayout::initialize");
1281 }
1282
1283 public:
1284 VirtualCallTypeData(DataLayout* layout) :
1285 VirtualCallData(layout),
1286 _args(VirtualCallData::static_cell_count()+TypeEntriesAtCall::header_cell_count(), number_of_arguments()),
1287 _ret(cell_count() - ReturnTypeEntry::static_cell_count())
1288 {
1289 assert(layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1290 // Some compilers (VC++) don't want this passed in member initialization list
1291 _args.set_profile_data(this);
1292 _ret.set_profile_data(this);
1293 }
1294
1295 const TypeStackSlotEntries* args() const {
1296 assert(has_arguments(), "no profiling of arguments");
1297 return &_args;
1298 }
1299
1300 const ReturnTypeEntry* ret() const {
1301 assert(has_return(), "no profiling of return value");
1302 return &_ret;
1303 }
1304
1305 virtual bool is_VirtualCallTypeData() const { return true; }
1306
1307 static int static_cell_count() {
1308 return -1;
1309 }
1310
1311 static int compute_cell_count(BytecodeStream* stream) {
1312 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::compute_cell_count(stream);
1313 }
1314
1315 static void initialize(DataLayout* dl, int cell_count) {
1316 TypeEntriesAtCall::initialize(dl, VirtualCallData::static_cell_count(), cell_count);
1317 }
1318
1319 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1320
1321 virtual int cell_count() const {
1322 return VirtualCallData::static_cell_count() +
1323 TypeEntriesAtCall::header_cell_count() +
1324 int_at_unchecked(cell_count_global_offset());
1325 }
1326
1327 int number_of_arguments() const {
1328 return cell_count_no_header() / TypeStackSlotEntries::per_arg_count();
1329 }
1330
1331 void set_argument_type(int i, Klass* k) {
1332 assert(has_arguments(), "no arguments!");
1333 intptr_t current = _args.type(i);
1334 _args.set_type(i, TypeEntries::with_status(k, current));
1335 }
1336
1337 void set_return_type(Klass* k) {
1338 assert(has_return(), "no return!");
1339 intptr_t current = _ret.type();
1340 _ret.set_type(TypeEntries::with_status(k, current));
1341 }
1342
1343 // An entry for a return value takes less space than an entry for an
1344 // argument, so if the remainder of the number of cells divided by
1345 // the number of cells for an argument is not null, a return value
1346 // is profiled in this object.
1347 bool has_return() const {
1348 bool res = (cell_count_no_header() % TypeStackSlotEntries::per_arg_count()) != 0;
1349 assert (!res || TypeEntriesAtCall::return_profiling_enabled(), "no profiling of return values");
1350 return res;
1351 }
1352
1353 // An entry for a return value takes less space than an entry for an
1354 // argument so if the number of cells exceeds the number of cells
1355 // needed for an argument, this object contains type information for
1356 // at least one argument.
1357 bool has_arguments() const {
1358 bool res = cell_count_no_header() >= TypeStackSlotEntries::per_arg_count();
1359 assert (!res || TypeEntriesAtCall::arguments_profiling_enabled(), "no profiling of arguments");
1360 return res;
1361 }
1362
1363 // Code generation support
1364 static ByteSize args_data_offset() {
1365 return cell_offset(VirtualCallData::static_cell_count()) + TypeEntriesAtCall::args_data_offset();
1366 }
1367
1368 ByteSize argument_type_offset(int i) {
1369 return _args.type_offset(i);
1370 }
1371
1372 ByteSize return_type_offset() {
1373 return _ret.type_offset();
1374 }
1375
1376 // GC support
1377 virtual void clean_weak_klass_links(bool always_clean) {
1378 ReceiverTypeData::clean_weak_klass_links(always_clean);
1379 if (has_arguments()) {
1380 _args.clean_weak_klass_links(always_clean);
1381 }
1382 if (has_return()) {
1383 _ret.clean_weak_klass_links(always_clean);
1384 }
1385 }
1386
1387 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1388 };
1389
1390 // RetData
1391 //
1392 // A RetData is used to access profiling information for a ret bytecode.
1393 // It is composed of a count of the number of times that the ret has
1394 // been executed, followed by a series of triples of the form
1395 // (bci, count, di) which count the number of times that some bci was the
1396 // target of the ret and cache a corresponding data displacement.
1397 class RetData : public CounterData {
1398 protected:
1399 enum {
1400 bci0_offset = counter_cell_count,
1401 count0_offset,
1402 displacement0_offset,
1403 ret_row_cell_count = (displacement0_offset + 1) - bci0_offset
1404 };
1405
1406 void set_bci(uint row, int bci) {
1407 assert((uint)row < row_limit(), "oob");
1408 set_int_at(bci0_offset + row * ret_row_cell_count, bci);
1409 }
1410 void release_set_bci(uint row, int bci);
1411 void set_bci_count(uint row, uint count) {
1412 assert((uint)row < row_limit(), "oob");
1413 set_uint_at(count0_offset + row * ret_row_cell_count, count);
1414 }
1415 void set_bci_displacement(uint row, int disp) {
1416 set_int_at(displacement0_offset + row * ret_row_cell_count, disp);
1417 }
1418
1419 public:
1420 RetData(DataLayout* layout) : CounterData(layout) {
1421 assert(layout->tag() == DataLayout::ret_data_tag, "wrong type");
1422 }
1423
1424 virtual bool is_RetData() const { return true; }
1425
1426 enum {
1427 no_bci = -1 // value of bci when bci1/2 are not in use.
1428 };
1429
1430 static int static_cell_count() {
1431 return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count;
1432 }
1433
1434 virtual int cell_count() const {
1435 return static_cell_count();
1436 }
1437
1438 static uint row_limit() {
1439 return (uint) BciProfileWidth;
1440 }
1441 static int bci_cell_index(uint row) {
1442 return bci0_offset + row * ret_row_cell_count;
1443 }
1444 static int bci_count_cell_index(uint row) {
1445 return count0_offset + row * ret_row_cell_count;
1446 }
1447 static int bci_displacement_cell_index(uint row) {
1448 return displacement0_offset + row * ret_row_cell_count;
1449 }
1450
1451 // Direct accessors
1452 int bci(uint row) const {
1453 return int_at(bci_cell_index(row));
1454 }
1455 uint bci_count(uint row) const {
1456 return uint_at(bci_count_cell_index(row));
1457 }
1458 int bci_displacement(uint row) const {
1459 return int_at(bci_displacement_cell_index(row));
1460 }
1461
1462 // Interpreter Runtime support
1463 address fixup_ret(int return_bci, MethodData* mdo);
1464
1465 // Code generation support
1466 static ByteSize bci_offset(uint row) {
1467 return cell_offset(bci_cell_index(row));
1468 }
1469 static ByteSize bci_count_offset(uint row) {
1470 return cell_offset(bci_count_cell_index(row));
1471 }
1472 static ByteSize bci_displacement_offset(uint row) {
1473 return cell_offset(bci_displacement_cell_index(row));
1474 }
1475
1476 // Specific initialization.
1477 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1478
1479 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1480 };
1481
1482 // BranchData
1483 //
1484 // A BranchData is used to access profiling data for a two-way branch.
1485 // It consists of taken and not_taken counts as well as a data displacement
1486 // for the taken case.
1487 class BranchData : public JumpData {
1488 friend class VMStructs;
1489 friend class JVMCIVMStructs;
1490 protected:
1491 enum {
1492 not_taken_off_set = jump_cell_count,
1493 branch_cell_count
1494 };
1495
1496 void set_displacement(int displacement) {
1497 set_int_at(displacement_off_set, displacement);
1498 }
1499
1500 public:
1501 BranchData(DataLayout* layout) : JumpData(layout) {
1502 assert(layout->tag() == DataLayout::branch_data_tag, "wrong type");
1503 }
1504
1505 virtual bool is_BranchData() const { return true; }
1506
1507 static int static_cell_count() {
1508 return branch_cell_count;
1509 }
1510
1511 virtual int cell_count() const {
1512 return static_cell_count();
1513 }
1514
1515 // Direct accessor
1516 uint not_taken() const {
1517 return uint_at(not_taken_off_set);
1518 }
1519
1520 void set_not_taken(uint cnt) {
1521 set_uint_at(not_taken_off_set, cnt);
1522 }
1523
1524 uint inc_not_taken() {
1525 uint cnt = not_taken() + 1;
1526 // Did we wrap? Will compiler screw us??
1527 if (cnt == 0) cnt--;
1528 set_uint_at(not_taken_off_set, cnt);
1529 return cnt;
1530 }
1531
1532 // Code generation support
1533 static ByteSize not_taken_offset() {
1534 return cell_offset(not_taken_off_set);
1535 }
1536 static ByteSize branch_data_size() {
1537 return cell_offset(branch_cell_count);
1538 }
1539
1540 // Specific initialization.
1541 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1542
1543 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1544 };
1545
1546 // ArrayData
1547 //
1548 // A ArrayData is a base class for accessing profiling data which does
1549 // not have a statically known size. It consists of an array length
1550 // and an array start.
1551 class ArrayData : public ProfileData {
1552 friend class VMStructs;
1553 friend class JVMCIVMStructs;
1554 protected:
1555 friend class DataLayout;
1556
1557 enum {
1558 array_len_off_set,
1559 array_start_off_set
1560 };
1561
1562 uint array_uint_at(int index) const {
1563 int aindex = index + array_start_off_set;
1564 return uint_at(aindex);
1565 }
1566 int array_int_at(int index) const {
1567 int aindex = index + array_start_off_set;
1568 return int_at(aindex);
1569 }
1570 oop array_oop_at(int index) const {
1571 int aindex = index + array_start_off_set;
1572 return oop_at(aindex);
1573 }
1574 void array_set_int_at(int index, int value) {
1575 int aindex = index + array_start_off_set;
1576 set_int_at(aindex, value);
1577 }
1578
1579 // Code generation support for subclasses.
1580 static ByteSize array_element_offset(int index) {
1581 return cell_offset(array_start_off_set + index);
1582 }
1583
1584 public:
1585 ArrayData(DataLayout* layout) : ProfileData(layout) {}
1586
1587 virtual bool is_ArrayData() const { return true; }
1588
1589 static int static_cell_count() {
1590 return -1;
1591 }
1592
1593 int array_len() const {
1594 return int_at_unchecked(array_len_off_set);
1595 }
1596
1597 virtual int cell_count() const {
1598 return array_len() + 1;
1599 }
1600
1601 // Code generation support
1602 static ByteSize array_len_offset() {
1603 return cell_offset(array_len_off_set);
1604 }
1605 static ByteSize array_start_offset() {
1606 return cell_offset(array_start_off_set);
1607 }
1608 };
1609
1610 // MultiBranchData
1611 //
1612 // A MultiBranchData is used to access profiling information for
1613 // a multi-way branch (*switch bytecodes). It consists of a series
1614 // of (count, displacement) pairs, which count the number of times each
1615 // case was taken and specify the data displacement for each branch target.
1616 class MultiBranchData : public ArrayData {
1617 friend class VMStructs;
1618 friend class JVMCIVMStructs;
1619 protected:
1620 enum {
1621 default_count_off_set,
1622 default_disaplacement_off_set,
1623 case_array_start
1624 };
1625 enum {
1626 relative_count_off_set,
1627 relative_displacement_off_set,
1628 per_case_cell_count
1629 };
1630
1631 void set_default_displacement(int displacement) {
1632 array_set_int_at(default_disaplacement_off_set, displacement);
1633 }
1634 void set_displacement_at(int index, int displacement) {
1635 array_set_int_at(case_array_start +
1636 index * per_case_cell_count +
1637 relative_displacement_off_set,
1638 displacement);
1639 }
1640
1641 public:
1642 MultiBranchData(DataLayout* layout) : ArrayData(layout) {
1643 assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type");
1644 }
1645
1646 virtual bool is_MultiBranchData() const { return true; }
1647
1648 static int compute_cell_count(BytecodeStream* stream);
1649
1650 int number_of_cases() const {
1651 int alen = array_len() - 2; // get rid of default case here.
1652 assert(alen % per_case_cell_count == 0, "must be even");
1653 return (alen / per_case_cell_count);
1654 }
1655
1656 uint default_count() const {
1657 return array_uint_at(default_count_off_set);
1658 }
1659 int default_displacement() const {
1660 return array_int_at(default_disaplacement_off_set);
1661 }
1662
1663 uint count_at(int index) const {
1664 return array_uint_at(case_array_start +
1665 index * per_case_cell_count +
1666 relative_count_off_set);
1667 }
1668 int displacement_at(int index) const {
1669 return array_int_at(case_array_start +
1670 index * per_case_cell_count +
1671 relative_displacement_off_set);
1672 }
1673
1674 // Code generation support
1675 static ByteSize default_count_offset() {
1676 return array_element_offset(default_count_off_set);
1677 }
1678 static ByteSize default_displacement_offset() {
1679 return array_element_offset(default_disaplacement_off_set);
1680 }
1681 static ByteSize case_count_offset(int index) {
1682 return case_array_offset() +
1683 (per_case_size() * index) +
1684 relative_count_offset();
1685 }
1686 static ByteSize case_array_offset() {
1687 return array_element_offset(case_array_start);
1688 }
1689 static ByteSize per_case_size() {
1690 return in_ByteSize(per_case_cell_count) * cell_size;
1691 }
1692 static ByteSize relative_count_offset() {
1693 return in_ByteSize(relative_count_off_set) * cell_size;
1694 }
1695 static ByteSize relative_displacement_offset() {
1696 return in_ByteSize(relative_displacement_off_set) * cell_size;
1697 }
1698
1699 // Specific initialization.
1700 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1701
1702 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1703 };
1704
1705 class ArgInfoData : public ArrayData {
1706
1707 public:
1708 ArgInfoData(DataLayout* layout) : ArrayData(layout) {
1709 assert(layout->tag() == DataLayout::arg_info_data_tag, "wrong type");
1710 }
1711
1712 virtual bool is_ArgInfoData() const { return true; }
1713
1714
1715 int number_of_args() const {
1716 return array_len();
1717 }
1718
1719 uint arg_modified(int arg) const {
1720 return array_uint_at(arg);
1721 }
1722
1723 void set_arg_modified(int arg, uint val) {
1724 array_set_int_at(arg, val);
1725 }
1726
1727 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1728 };
1729
1730 // ParametersTypeData
1731 //
1732 // A ParametersTypeData is used to access profiling information about
1733 // types of parameters to a method
1734 class ParametersTypeData : public ArrayData {
1735
1736 private:
1737 TypeStackSlotEntries _parameters;
1738
1739 static int stack_slot_local_offset(int i) {
1740 assert_profiling_enabled();
1741 return array_start_off_set + TypeStackSlotEntries::stack_slot_local_offset(i);
1742 }
1743
1744 static int type_local_offset(int i) {
1745 assert_profiling_enabled();
1746 return array_start_off_set + TypeStackSlotEntries::type_local_offset(i);
1747 }
1748
1749 static bool profiling_enabled();
1750 static void assert_profiling_enabled() {
1751 assert(profiling_enabled(), "method parameters profiling should be on");
1752 }
1753
1754 public:
1755 ParametersTypeData(DataLayout* layout) : ArrayData(layout), _parameters(1, number_of_parameters()) {
1756 assert(layout->tag() == DataLayout::parameters_type_data_tag, "wrong type");
1757 // Some compilers (VC++) don't want this passed in member initialization list
1758 _parameters.set_profile_data(this);
1759 }
1760
1761 static int compute_cell_count(Method* m);
1762
1763 virtual bool is_ParametersTypeData() const { return true; }
1764
1765 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1766
1767 int number_of_parameters() const {
1768 return array_len() / TypeStackSlotEntries::per_arg_count();
1769 }
1770
1771 const TypeStackSlotEntries* parameters() const { return &_parameters; }
1772
1773 uint stack_slot(int i) const {
1774 return _parameters.stack_slot(i);
1775 }
1776
1777 void set_type(int i, Klass* k) {
1778 intptr_t current = _parameters.type(i);
1779 _parameters.set_type(i, TypeEntries::with_status((intptr_t)k, current));
1780 }
1781
1782 virtual void clean_weak_klass_links(bool always_clean) {
1783 _parameters.clean_weak_klass_links(always_clean);
1784 }
1785
1786 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1787
1788 static ByteSize stack_slot_offset(int i) {
1789 return cell_offset(stack_slot_local_offset(i));
1790 }
1791
1792 static ByteSize type_offset(int i) {
1793 return cell_offset(type_local_offset(i));
1794 }
1795 };
1796
1797 // SpeculativeTrapData
1798 //
1799 // A SpeculativeTrapData is used to record traps due to type
1800 // speculation. It records the root of the compilation: that type
1801 // speculation is wrong in the context of one compilation (for
1802 // method1) doesn't mean it's wrong in the context of another one (for
1803 // method2). Type speculation could have more/different data in the
1804 // context of the compilation of method2 and it's worthwhile to try an
1805 // optimization that failed for compilation of method1 in the context
1806 // of compilation of method2.
1807 // Space for SpeculativeTrapData entries is allocated from the extra
1808 // data space in the MDO. If we run out of space, the trap data for
1809 // the ProfileData at that bci is updated.
1810 class SpeculativeTrapData : public ProfileData {
1811 protected:
1812 enum {
1813 speculative_trap_method,
1814 #ifndef _LP64
1815 // The size of the area for traps is a multiple of the header
1816 // size, 2 cells on 32 bits. Packed at the end of this area are
1817 // argument info entries (with tag
1818 // DataLayout::arg_info_data_tag). The logic in
1819 // MethodData::bci_to_extra_data() that guarantees traps don't
1820 // overflow over argument info entries assumes the size of a
1821 // SpeculativeTrapData is twice the header size. On 32 bits, a
1822 // SpeculativeTrapData must be 4 cells.
1823 padding,
1824 #endif
1825 speculative_trap_cell_count
1826 };
1827 public:
1828 SpeculativeTrapData(DataLayout* layout) : ProfileData(layout) {
1829 assert(layout->tag() == DataLayout::speculative_trap_data_tag, "wrong type");
1830 }
1831
1832 virtual bool is_SpeculativeTrapData() const { return true; }
1833
1834 static int static_cell_count() {
1835 return speculative_trap_cell_count;
1836 }
1837
1838 virtual int cell_count() const {
1839 return static_cell_count();
1840 }
1841
1842 // Direct accessor
1843 Method* method() const {
1844 return (Method*)intptr_at(speculative_trap_method);
1845 }
1846
1847 void set_method(Method* m) {
1848 assert(!m->is_old(), "cannot add old methods");
1849 set_intptr_at(speculative_trap_method, (intptr_t)m);
1850 }
1851
1852 static ByteSize method_offset() {
1853 return cell_offset(speculative_trap_method);
1854 }
1855
1856 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1857 };
1858
1859 // MethodData*
1860 //
1861 // A MethodData* holds information which has been collected about
1862 // a method. Its layout looks like this:
1863 //
1864 // -----------------------------
1865 // | header |
1866 // | klass |
1867 // -----------------------------
1868 // | method |
1869 // | size of the MethodData* |
1870 // -----------------------------
1871 // | Data entries... |
1872 // | (variable size) |
1873 // | |
1874 // . .
1875 // . .
1876 // . .
1877 // | |
1878 // -----------------------------
1879 //
1880 // The data entry area is a heterogeneous array of DataLayouts. Each
1881 // DataLayout in the array corresponds to a specific bytecode in the
1882 // method. The entries in the array are sorted by the corresponding
1883 // bytecode. Access to the data is via resource-allocated ProfileData,
1884 // which point to the underlying blocks of DataLayout structures.
1885 //
1886 // During interpretation, if profiling in enabled, the interpreter
1887 // maintains a method data pointer (mdp), which points at the entry
1888 // in the array corresponding to the current bci. In the course of
1889 // interpretation, when a bytecode is encountered that has profile data
1890 // associated with it, the entry pointed to by mdp is updated, then the
1891 // mdp is adjusted to point to the next appropriate DataLayout. If mdp
1892 // is null to begin with, the interpreter assumes that the current method
1893 // is not (yet) being profiled.
1894 //
1895 // In MethodData* parlance, "dp" is a "data pointer", the actual address
1896 // of a DataLayout element. A "di" is a "data index", the offset in bytes
1897 // from the base of the data entry array. A "displacement" is the byte offset
1898 // in certain ProfileData objects that indicate the amount the mdp must be
1899 // adjusted in the event of a change in control flow.
1900 //
1901
1902 class CleanExtraDataClosure : public StackObj {
1903 public:
1904 virtual bool is_live(Method* m) = 0;
1905 };
1906
1907
1908 #if INCLUDE_JVMCI
1909 // Encapsulates an encoded speculation reason. These are linked together in
1910 // a list that is atomically appended to during deoptimization. Entries are
1911 // never removed from the list.
1912 // @see jdk.vm.ci.hotspot.HotSpotSpeculationLog.HotSpotSpeculationEncoding
1913 class FailedSpeculation: public CHeapObj<mtCompiler> {
1914 private:
1915 // The length of HotSpotSpeculationEncoding.toByteArray(). The data itself
1916 // is an array embedded at the end of this object.
1917 int _data_len;
1918
1919 // Next entry in a linked list.
1920 FailedSpeculation* _next;
1921
1922 FailedSpeculation(address data, int data_len);
1923
1924 FailedSpeculation** next_adr() { return &_next; }
1925
1926 // Placement new operator for inlining the speculation data into
1927 // the FailedSpeculation object.
1928 void* operator new(size_t size, size_t fs_size) throw();
1929
1930 public:
1931 char* data() { return (char*)(((address) this) + sizeof(FailedSpeculation)); }
1932 int data_len() const { return _data_len; }
1933 FailedSpeculation* next() const { return _next; }
1934
1935 // Atomically appends a speculation from nm to the list whose head is at (*failed_speculations_address).
1936 // Returns false if the FailedSpeculation object could not be allocated.
1937 static bool add_failed_speculation(nmethod* nm, FailedSpeculation** failed_speculations_address, address speculation, int speculation_len);
1938
1939 // Frees all entries in the linked list whose head is at (*failed_speculations_address).
1940 static void free_failed_speculations(FailedSpeculation** failed_speculations_address);
1941 };
1942 #endif
1943
1944 class ciMethodData;
1945
1946 class MethodData : public Metadata {
1947 friend class VMStructs;
1948 friend class JVMCIVMStructs;
1949 friend class ProfileData;
1950 friend class TypeEntriesAtCall;
1951 friend class ciMethodData;
1952 friend class VM_ReinitializeMDO;
1953
1954 // If you add a new field that points to any metaspace object, you
1955 // must add this field to MethodData::metaspace_pointers_do().
1956
1957 // Back pointer to the Method*
1958 Method* _method;
1959
1960 // Size of this oop in bytes
1961 int _size;
1962
1963 // Cached hint for bci_to_dp and bci_to_data
1964 int _hint_di;
1965
1966 Mutex _extra_data_lock;
1967
1968 MethodData(const methodHandle& method);
1969
1970 void initialize();
1971
1972 public:
1973 static MethodData* allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS);
1974
1975 virtual bool is_methodData() const { return true; }
1976
1977 // Safely reinitialize the data in the MDO. This is intended as a testing facility as the
1978 // reinitialization is performed at a safepoint so it's isn't cheap and it doesn't ensure that all
1979 // readers will see consistent profile data.
1980 void reinitialize();
1981
1982 // Whole-method sticky bits and flags
1983 enum {
1984 _trap_hist_limit = Deoptimization::Reason_TRAP_HISTORY_LENGTH,
1985 _trap_hist_mask = max_jubyte,
1986 _extra_data_count = 4 // extra DataLayout headers, for trap history
1987 }; // Public flag values
1988
1989 // Compiler-related counters.
1990 class CompilerCounters {
1991 friend class VMStructs;
1992 friend class JVMCIVMStructs;
1993
1994 uint _nof_decompiles; // count of all nmethod removals
1995 uint _nof_overflow_recompiles; // recompile count, excluding recomp. bits
1996 uint _nof_overflow_traps; // trap count, excluding _trap_hist
1997 union {
1998 intptr_t _align;
1999 // JVMCI separates trap history for OSR compilations from normal compilations
2000 u1 _array[JVMCI_ONLY(2 *) MethodData::_trap_hist_limit];
2001 } _trap_hist;
2002
2003 public:
2004 CompilerCounters() : _nof_decompiles(0), _nof_overflow_recompiles(0), _nof_overflow_traps(0) {
2005 #ifndef ZERO
2006 // Some Zero platforms do not have expected alignment, and do not use
2007 // this code. static_assert would still fire and fail for them.
2008 static_assert(sizeof(_trap_hist) % HeapWordSize == 0, "align");
2009 #endif
2010 uint size_in_words = sizeof(_trap_hist) / HeapWordSize;
2011 Copy::zero_to_words((HeapWord*) &_trap_hist, size_in_words);
2012 }
2013
2014 // Return (uint)-1 for overflow.
2015 uint trap_count(int reason) const {
2016 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2017 return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1;
2018 }
2019
2020 uint inc_trap_count(int reason) {
2021 // Count another trap, anywhere in this method.
2022 assert(reason >= 0, "must be single trap");
2023 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2024 uint cnt1 = 1 + _trap_hist._array[reason];
2025 if ((cnt1 & _trap_hist_mask) != 0) { // if no counter overflow...
2026 _trap_hist._array[reason] = (u1)cnt1;
2027 return cnt1;
2028 } else {
2029 return _trap_hist_mask + (++_nof_overflow_traps);
2030 }
2031 }
2032
2033 uint overflow_trap_count() const {
2034 return _nof_overflow_traps;
2035 }
2036 uint overflow_recompile_count() const {
2037 return _nof_overflow_recompiles;
2038 }
2039 uint inc_overflow_recompile_count() {
2040 return ++_nof_overflow_recompiles;
2041 }
2042 uint decompile_count() const {
2043 return _nof_decompiles;
2044 }
2045 uint inc_decompile_count() {
2046 return ++_nof_decompiles;
2047 }
2048
2049 // Support for code generation
2050 static ByteSize trap_history_offset() {
2051 return byte_offset_of(CompilerCounters, _trap_hist._array);
2052 }
2053 };
2054
2055 private:
2056 CompilerCounters _compiler_counters;
2057
2058 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2059 intx _eflags; // flags on escape information
2060 intx _arg_local; // bit set of non-escaping arguments
2061 intx _arg_stack; // bit set of stack-allocatable arguments
2062 intx _arg_returned; // bit set of returned arguments
2063
2064 int _creation_mileage; // method mileage at MDO creation
2065
2066 // How many invocations has this MDO seen?
2067 // These counters are used to determine the exact age of MDO.
2068 // We need those because in tiered a method can be concurrently
2069 // executed at different levels.
2070 InvocationCounter _invocation_counter;
2071 // Same for backedges.
2072 InvocationCounter _backedge_counter;
2073 // Counter values at the time profiling started.
2074 int _invocation_counter_start;
2075 int _backedge_counter_start;
2076 uint _tenure_traps;
2077 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog
2078 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog
2079
2080 // Number of loops and blocks is computed when compiling the first
2081 // time with C1. It is used to determine if method is trivial.
2082 short _num_loops;
2083 short _num_blocks;
2084 // Does this method contain anything worth profiling?
2085 enum WouldProfile {unknown, no_profile, profile};
2086 WouldProfile _would_profile;
2087
2088 #if INCLUDE_JVMCI
2089 // Support for HotSpotMethodData.setCompiledIRSize(int)
2090 FailedSpeculation* _failed_speculations;
2091 int _jvmci_ir_size;
2092 #endif
2093
2094 // Size of _data array in bytes. (Excludes header and extra_data fields.)
2095 int _data_size;
2096
2097 // data index for the area dedicated to parameters. -1 if no
2098 // parameter profiling.
2099 enum { no_parameters = -2, parameters_uninitialized = -1 };
2100 int _parameters_type_data_di;
2101
2102 // data index of exception handler profiling data
2103 int _exception_handler_data_di;
2104
2105 // Beginning of the data entries
2106 // See comment in ciMethodData::load_data
2107 intptr_t _data[1];
2108
2109 // Helper for size computation
2110 static int compute_data_size(BytecodeStream* stream);
2111 static int bytecode_cell_count(Bytecodes::Code code);
2112 static bool is_speculative_trap_bytecode(Bytecodes::Code code);
2113 enum { no_profile_data = -1, variable_cell_count = -2 };
2114
2115 // Helper for initialization
2116 DataLayout* data_layout_at(int data_index) const {
2117 assert(data_index % sizeof(intptr_t) == 0, "unaligned");
2118 return (DataLayout*) (((address)_data) + data_index);
2119 }
2120
2121 static int single_exception_handler_data_cell_count() {
2122 return BitData::static_cell_count();
2123 }
2124
2125 static int single_exception_handler_data_size() {
2126 return DataLayout::compute_size_in_bytes(single_exception_handler_data_cell_count());
2127 }
2128
2129 DataLayout* exception_handler_data_at(int exception_handler_index) const {
2130 return data_layout_at(_exception_handler_data_di + (exception_handler_index * single_exception_handler_data_size()));
2131 }
2132
2133 int num_exception_handler_data() const {
2134 return exception_handlers_data_size() / single_exception_handler_data_size();
2135 }
2136
2137 // Initialize an individual data segment. Returns the size of
2138 // the segment in bytes.
2139 int initialize_data(BytecodeStream* stream, int data_index);
2140
2141 // Helper for data_at
2142 DataLayout* limit_data_position() const {
2143 return data_layout_at(_data_size);
2144 }
2145 bool out_of_bounds(int data_index) const {
2146 return data_index >= data_size();
2147 }
2148
2149 // Give each of the data entries a chance to perform specific
2150 // data initialization.
2151 void post_initialize(BytecodeStream* stream);
2152
2153 // hint accessors
2154 int hint_di() const { return _hint_di; }
2155 void set_hint_di(int di) {
2156 assert(!out_of_bounds(di), "hint_di out of bounds");
2157 _hint_di = di;
2158 }
2159
2160 DataLayout* data_layout_before(int bci) {
2161 // avoid SEGV on this edge case
2162 if (data_size() == 0)
2163 return nullptr;
2164 DataLayout* layout = data_layout_at(hint_di());
2165 if (layout->bci() <= bci)
2166 return layout;
2167 return data_layout_at(first_di());
2168 }
2169
2170 // What is the index of the first data entry?
2171 int first_di() const { return 0; }
2172
2173 ProfileData* bci_to_extra_data_find(int bci, Method* m, DataLayout*& dp);
2174 // Find or create an extra ProfileData:
2175 ProfileData* bci_to_extra_data(int bci, Method* m, bool create_if_missing);
2176
2177 // return the argument info cell
2178 ArgInfoData *arg_info();
2179
2180 enum {
2181 no_type_profile = 0,
2182 type_profile_jsr292 = 1,
2183 type_profile_all = 2
2184 };
2185
2186 static bool profile_jsr292(const methodHandle& m, int bci);
2187 static bool profile_unsafe(const methodHandle& m, int bci);
2188 static bool profile_memory_access(const methodHandle& m, int bci);
2189 static int profile_arguments_flag();
2190 static bool profile_all_arguments();
2191 static bool profile_arguments_for_invoke(const methodHandle& m, int bci);
2192 static int profile_return_flag();
2193 static bool profile_all_return();
2194 static bool profile_return_for_invoke(const methodHandle& m, int bci);
2195 static int profile_parameters_flag();
2196 static bool profile_parameters_jsr292_only();
2197 static bool profile_all_parameters();
2198
2199 void clean_extra_data_helper(DataLayout* dp, int shift, bool reset = false);
2200 void verify_extra_data_clean(CleanExtraDataClosure* cl);
2201
2202 DataLayout* exception_handler_bci_to_data_helper(int bci);
2203
2204 public:
2205 void clean_extra_data(CleanExtraDataClosure* cl);
2206
2207 static int header_size() {
2208 return sizeof(MethodData)/wordSize;
2209 }
2210
2211 // Compute the size of a MethodData* before it is created.
2212 static int compute_allocation_size_in_bytes(const methodHandle& method);
2213 static int compute_allocation_size_in_words(const methodHandle& method);
2214 static int compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps);
2215
2216 // Determine if a given bytecode can have profile information.
2217 static bool bytecode_has_profile(Bytecodes::Code code) {
2218 return bytecode_cell_count(code) != no_profile_data;
2219 }
2220
2221 // reset into original state
2222 void init();
2223
2224 // My size
2225 int size_in_bytes() const { return _size; }
2226 int size() const { return align_metadata_size(align_up(_size, BytesPerWord)/BytesPerWord); }
2227
2228 int creation_mileage() const { return _creation_mileage; }
2229 void set_creation_mileage(int x) { _creation_mileage = x; }
2230
2231 int invocation_count() {
2232 if (invocation_counter()->carry()) {
2233 return InvocationCounter::count_limit;
2234 }
2235 return invocation_counter()->count();
2236 }
2237 int backedge_count() {
2238 if (backedge_counter()->carry()) {
2239 return InvocationCounter::count_limit;
2240 }
2241 return backedge_counter()->count();
2242 }
2243
2244 int invocation_count_start() {
2245 if (invocation_counter()->carry()) {
2246 return 0;
2247 }
2248 return _invocation_counter_start;
2249 }
2250
2251 int backedge_count_start() {
2252 if (backedge_counter()->carry()) {
2253 return 0;
2254 }
2255 return _backedge_counter_start;
2256 }
2257
2258 int invocation_count_delta() { return invocation_count() - invocation_count_start(); }
2259 int backedge_count_delta() { return backedge_count() - backedge_count_start(); }
2260
2261 void reset_start_counters() {
2262 _invocation_counter_start = invocation_count();
2263 _backedge_counter_start = backedge_count();
2264 }
2265
2266 InvocationCounter* invocation_counter() { return &_invocation_counter; }
2267 InvocationCounter* backedge_counter() { return &_backedge_counter; }
2268
2269 #if INCLUDE_JVMCI
2270 FailedSpeculation** get_failed_speculations_address() {
2271 return &_failed_speculations;
2272 }
2273 #endif
2274
2275 void set_would_profile(bool p) { _would_profile = p ? profile : no_profile; }
2276 bool would_profile() const { return _would_profile != no_profile; }
2277
2278 int num_loops() const { return _num_loops; }
2279 void set_num_loops(short n) { _num_loops = n; }
2280 int num_blocks() const { return _num_blocks; }
2281 void set_num_blocks(short n) { _num_blocks = n; }
2282
2283 bool is_mature() const; // consult mileage and ProfileMaturityPercentage
2284 static int mileage_of(Method* m);
2285
2286 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2287 enum EscapeFlag {
2288 estimated = 1 << 0,
2289 return_local = 1 << 1,
2290 return_allocated = 1 << 2,
2291 allocated_escapes = 1 << 3,
2292 unknown_modified = 1 << 4
2293 };
2294
2295 intx eflags() { return _eflags; }
2296 intx arg_local() { return _arg_local; }
2297 intx arg_stack() { return _arg_stack; }
2298 intx arg_returned() { return _arg_returned; }
2299 uint arg_modified(int a);
2300 void set_eflags(intx v) { _eflags = v; }
2301 void set_arg_local(intx v) { _arg_local = v; }
2302 void set_arg_stack(intx v) { _arg_stack = v; }
2303 void set_arg_returned(intx v) { _arg_returned = v; }
2304 void set_arg_modified(int a, uint v);
2305 void clear_escape_info() { _eflags = _arg_local = _arg_stack = _arg_returned = 0; }
2306
2307 // Location and size of data area
2308 address data_base() const {
2309 return (address) _data;
2310 }
2311 int data_size() const {
2312 return _data_size;
2313 }
2314
2315 int parameters_size_in_bytes() const {
2316 return pointer_delta_as_int((address) parameters_data_limit(), (address) parameters_data_base());
2317 }
2318
2319 int exception_handlers_data_size() const {
2320 return pointer_delta_as_int((address) exception_handler_data_limit(), (address) exception_handler_data_base());
2321 }
2322
2323 // Accessors
2324 Method* method() const { return _method; }
2325
2326 // Get the data at an arbitrary (sort of) data index.
2327 ProfileData* data_at(int data_index) const;
2328
2329 // Walk through the data in order.
2330 ProfileData* first_data() const { return data_at(first_di()); }
2331 ProfileData* next_data(ProfileData* current) const;
2332 DataLayout* next_data_layout(DataLayout* current) const;
2333 bool is_valid(ProfileData* current) const { return current != nullptr; }
2334 bool is_valid(DataLayout* current) const { return current != nullptr; }
2335
2336 // Convert a dp (data pointer) to a di (data index).
2337 int dp_to_di(address dp) const {
2338 return (int)(dp - ((address)_data));
2339 }
2340
2341 // bci to di/dp conversion.
2342 address bci_to_dp(int bci);
2343 int bci_to_di(int bci) {
2344 return dp_to_di(bci_to_dp(bci));
2345 }
2346
2347 // Get the data at an arbitrary bci, or null if there is none.
2348 ProfileData* bci_to_data(int bci);
2349
2350 // Same, but try to create an extra_data record if one is needed:
2351 ProfileData* allocate_bci_to_data(int bci, Method* m) {
2352 check_extra_data_locked();
2353
2354 ProfileData* data = nullptr;
2355 // If m not null, try to allocate a SpeculativeTrapData entry
2356 if (m == nullptr) {
2357 data = bci_to_data(bci);
2358 }
2359 if (data != nullptr) {
2360 return data;
2361 }
2362 data = bci_to_extra_data(bci, m, true);
2363 if (data != nullptr) {
2364 return data;
2365 }
2366 // If SpeculativeTrapData allocation fails try to allocate a
2367 // regular entry
2368 data = bci_to_data(bci);
2369 if (data != nullptr) {
2370 return data;
2371 }
2372 return bci_to_extra_data(bci, nullptr, true);
2373 }
2374
2375 BitData* exception_handler_bci_to_data_or_null(int bci);
2376 BitData exception_handler_bci_to_data(int bci);
2377
2378 // Add a handful of extra data records, for trap tracking.
2379 // Only valid after 'set_size' is called at the end of MethodData::initialize
2380 DataLayout* extra_data_base() const {
2381 check_extra_data_locked();
2382 return limit_data_position();
2383 }
2384 DataLayout* extra_data_limit() const { return (DataLayout*)((address)this + size_in_bytes()); }
2385 // pointers to sections in extra data
2386 DataLayout* args_data_limit() const { return parameters_data_base(); }
2387 DataLayout* parameters_data_base() const {
2388 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2389 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di) : parameters_data_limit();
2390 }
2391 DataLayout* parameters_data_limit() const {
2392 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2393 return exception_handler_data_base();
2394 }
2395 DataLayout* exception_handler_data_base() const { return data_layout_at(_exception_handler_data_di); }
2396 DataLayout* exception_handler_data_limit() const { return extra_data_limit(); }
2397
2398 int extra_data_size() const { return (int)((address)extra_data_limit() - (address)limit_data_position()); }
2399 static DataLayout* next_extra(DataLayout* dp);
2400
2401 // Return (uint)-1 for overflow.
2402 uint trap_count(int reason) const {
2403 return _compiler_counters.trap_count(reason);
2404 }
2405 // For loops:
2406 static uint trap_reason_limit() { return _trap_hist_limit; }
2407 static uint trap_count_limit() { return _trap_hist_mask; }
2408 uint inc_trap_count(int reason) {
2409 return _compiler_counters.inc_trap_count(reason);
2410 }
2411
2412 uint overflow_trap_count() const {
2413 return _compiler_counters.overflow_trap_count();
2414 }
2415 uint overflow_recompile_count() const {
2416 return _compiler_counters.overflow_recompile_count();
2417 }
2418 uint inc_overflow_recompile_count() {
2419 return _compiler_counters.inc_overflow_recompile_count();
2420 }
2421 uint decompile_count() const {
2422 return _compiler_counters.decompile_count();
2423 }
2424 uint inc_decompile_count() {
2425 uint dec_count = _compiler_counters.inc_decompile_count();
2426 if (dec_count > (uint)PerMethodRecompilationCutoff) {
2427 method()->set_not_compilable("decompile_count > PerMethodRecompilationCutoff", CompLevel_full_optimization);
2428 }
2429 return dec_count;
2430 }
2431 uint tenure_traps() const {
2432 return _tenure_traps;
2433 }
2434 void inc_tenure_traps() {
2435 _tenure_traps += 1;
2436 }
2437
2438 // Return pointer to area dedicated to parameters in MDO
2439 ParametersTypeData* parameters_type_data() const {
2440 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2441 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di)->data_in()->as_ParametersTypeData() : nullptr;
2442 }
2443
2444 int parameters_type_data_di() const {
2445 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2446 return _parameters_type_data_di != no_parameters ? _parameters_type_data_di : exception_handlers_data_di();
2447 }
2448
2449 int exception_handlers_data_di() const {
2450 return _exception_handler_data_di;
2451 }
2452
2453 // Support for code generation
2454 static ByteSize data_offset() {
2455 return byte_offset_of(MethodData, _data[0]);
2456 }
2457
2458 static ByteSize trap_history_offset() {
2459 return byte_offset_of(MethodData, _compiler_counters) + CompilerCounters::trap_history_offset();
2460 }
2461
2462 static ByteSize invocation_counter_offset() {
2463 return byte_offset_of(MethodData, _invocation_counter);
2464 }
2465
2466 static ByteSize backedge_counter_offset() {
2467 return byte_offset_of(MethodData, _backedge_counter);
2468 }
2469
2470 static ByteSize invoke_mask_offset() {
2471 return byte_offset_of(MethodData, _invoke_mask);
2472 }
2473
2474 static ByteSize backedge_mask_offset() {
2475 return byte_offset_of(MethodData, _backedge_mask);
2476 }
2477
2478 static ByteSize parameters_type_data_di_offset() {
2479 return byte_offset_of(MethodData, _parameters_type_data_di);
2480 }
2481
2482 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
2483 virtual MetaspaceObj::Type type() const { return MethodDataType; }
2484
2485 // Deallocation support
2486 void deallocate_contents(ClassLoaderData* loader_data);
2487 void release_C_heap_structures();
2488
2489 // GC support
2490 void set_size(int object_size_in_bytes) { _size = object_size_in_bytes; }
2491
2492 // Printing
2493 void print_on (outputStream* st) const;
2494 void print_value_on(outputStream* st) const;
2495
2496 // printing support for method data
2497 void print_data_on(outputStream* st) const;
2498
2499 const char* internal_name() const { return "{method data}"; }
2500
2501 // verification
2502 void verify_on(outputStream* st);
2503 void verify_data_on(outputStream* st);
2504
2505 static bool profile_parameters_for_method(const methodHandle& m);
2506 static bool profile_arguments();
2507 static bool profile_arguments_jsr292_only();
2508 static bool profile_return();
2509 static bool profile_parameters();
2510 static bool profile_return_jsr292_only();
2511
2512 void clean_method_data(bool always_clean);
2513 void clean_weak_method_links();
2514 Mutex* extra_data_lock() const { return const_cast<Mutex*>(&_extra_data_lock); }
2515 void check_extra_data_locked() const NOT_DEBUG_RETURN;
2516 };
2517
2518 #endif // SHARE_OOPS_METHODDATA_HPP