1 /*
2 * Copyright (c) 2000, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 */
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 "runtime/atomicAccess.hpp"
33 #include "runtime/deoptimization.hpp"
34 #include "runtime/mutex.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/copy.hpp"
37 #include "utilities/integerCast.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 // can be checked for its "maturity" by calling is_mature().
60 //
61 // Short (<32-bit) counters are designed to overflow to a known "saturated"
62 // state. Also, certain recorded per-BCI events are given one-bit counters
63 // which overflow to a saturated state which applied to all counters at
64 // that BCI. In other words, there is a small lattice which approximates
65 // the ideal of an infinite-precision counter for each event at each BCI,
66 // and the lattice quickly "bottoms out" in a state where all counters
67 // are taken to be indefinitely large.
68 //
69 // The reader will find many data races in profile gathering code, starting
70 // with invocation counter incrementation. None of these races harm correct
71 // execution of the compiled code.
72
73 // forward decl
74 class ProfileData;
75
76 // DataLayout
77 //
78 // Overlay for generic profiling data.
79 class DataLayout {
80 friend class VMStructs;
81 friend class JVMCIVMStructs;
82
83 private:
84 // Every data layout begins with a header. This header
85 // contains a tag, which is used to indicate the size/layout
86 // of the data, 8 bits of flags, which can be used in any way,
87 // 32 bits of trap history (none/one reason/many reasons),
88 // and a bci, which is used to tie this piece of data to a
89 // specific bci in the bytecodes.
90 union {
91 u8 _bits;
92 struct {
93 u1 _tag;
94 u1 _flags;
95 u2 _bci;
96 u4 _traps;
97 } _struct;
98 } _header;
99
100 // The data layout has an arbitrary number of cells, each sized
101 // to accommodate a pointer or an integer.
102 intptr_t _cells[1];
103
104 // Some types of data layouts need a length field.
105 static bool needs_array_len(u1 tag);
106
107 public:
108 enum {
109 counter_increment = 1
110 };
111
112 enum {
113 cell_size = sizeof(intptr_t)
114 };
115
116 // Tag values
117 enum : u1 {
118 no_tag,
119 bit_data_tag,
120 counter_data_tag,
121 jump_data_tag,
122 receiver_type_data_tag,
123 virtual_call_data_tag,
124 ret_data_tag,
125 branch_data_tag,
126 multi_branch_data_tag,
127 arg_info_data_tag,
128 call_type_data_tag,
129 virtual_call_type_data_tag,
130 parameters_type_data_tag,
131 speculative_trap_data_tag
132 };
133
134 enum {
135 // The trap state breaks down as [recompile:1 | reason:31].
136 // This further breakdown is defined in deoptimization.cpp.
137 // See Deoptimization::trap_state_reason for an assert that
138 // trap_bits is big enough to hold reasons < Reason_RECORDED_LIMIT.
139 //
140 // The trap_state is collected only if ProfileTraps is true.
141 trap_bits = 1+31, // 31: enough to distinguish [0..Reason_RECORDED_LIMIT].
142 trap_mask = -1,
143 first_flag = 0
144 };
145
146 // Size computation
147 static int header_size_in_bytes() {
148 return header_size_in_cells() * cell_size;
149 }
150 static int header_size_in_cells() {
151 return LP64_ONLY(1) NOT_LP64(2);
152 }
153
154 static int compute_size_in_bytes(int cell_count) {
155 return header_size_in_bytes() + cell_count * cell_size;
156 }
157
158 // Initialization
159 void initialize(u1 tag, u2 bci, int cell_count);
160
161 // Accessors
162 u1 tag() {
163 return _header._struct._tag;
164 }
165
166 // Return 32 bits of trap state.
167 // The state tells if traps with zero, one, or many reasons have occurred.
168 // It also tells whether zero or many recompilations have occurred.
169 // The associated trap histogram in the MDO itself tells whether
170 // traps are common or not. If a BCI shows that a trap X has
171 // occurred, and the MDO shows N occurrences of X, we make the
172 // simplifying assumption that all N occurrences can be blamed
173 // on that BCI.
174 uint trap_state() const {
175 return _header._struct._traps;
176 }
177
178 void set_trap_state(uint new_state) {
179 assert(ProfileTraps, "used only under +ProfileTraps");
180 uint old_flags = _header._struct._traps;
181 _header._struct._traps = new_state | old_flags;
182 }
183
184 u1 flags() const {
185 return AtomicAccess::load_acquire(&_header._struct._flags);
186 }
187
188 u2 bci() const {
189 return _header._struct._bci;
190 }
191
192 void set_header(u8 value) {
193 _header._bits = value;
194 }
195 u8 header() {
196 return _header._bits;
197 }
198 void set_cell_at(int index, intptr_t value) {
199 _cells[index] = value;
200 }
201 void release_set_cell_at(int index, intptr_t value);
202 intptr_t cell_at(int index) const {
203 return _cells[index];
204 }
205 intptr_t* cell_at_adr(int index) const {
206 return const_cast<intptr_t*>(&_cells[index]);
207 }
208
209 bool set_flag_at(u1 flag_number) {
210 const u1 bit = integer_cast<u1>(1 << flag_number);
211 u1 compare_value;
212 do {
213 compare_value = _header._struct._flags;
214 if ((compare_value & bit) == bit) {
215 // already set.
216 return false;
217 }
218 } while (compare_value != AtomicAccess::cmpxchg(&_header._struct._flags, compare_value, static_cast<u1>(compare_value | bit)));
219 return true;
220 }
221
222 bool clear_flag_at(u1 flag_number) {
223 const u1 bit = integer_cast<u1>(1 << flag_number);
224 u1 compare_value;
225 u1 exchange_value;
226 do {
227 compare_value = _header._struct._flags;
228 if ((compare_value & bit) == 0) {
229 // already cleaed.
230 return false;
231 }
232 exchange_value = compare_value & ~bit;
233 } while (compare_value != AtomicAccess::cmpxchg(&_header._struct._flags, compare_value, exchange_value));
234 return true;
235 }
236
237 bool flag_at(u1 flag_number) const {
238 return (flags() & (1 << flag_number)) != 0;
239 }
240
241 // Low-level support for code generation.
242 static ByteSize header_offset() {
243 return byte_offset_of(DataLayout, _header);
244 }
245 static ByteSize tag_offset() {
246 return byte_offset_of(DataLayout, _header._struct._tag);
247 }
248 static ByteSize flags_offset() {
249 return byte_offset_of(DataLayout, _header._struct._flags);
250 }
251 static ByteSize bci_offset() {
252 return byte_offset_of(DataLayout, _header._struct._bci);
253 }
254 static ByteSize cell_offset(int index) {
255 return byte_offset_of(DataLayout, _cells) + in_ByteSize(index * cell_size);
256 }
257 // Return a value which, when or-ed as a byte into _flags, sets the flag.
258 static u1 flag_number_to_constant(u1 flag_number) {
259 DataLayout temp; temp.set_header(0);
260 temp.set_flag_at(flag_number);
261 return temp._header._struct._flags;
262 }
263 // Return a value which, when or-ed as a word into _header, sets the flag.
264 static u8 flag_mask_to_header_mask(u1 byte_constant) {
265 DataLayout temp; temp.set_header(0);
266 temp._header._struct._flags = byte_constant;
267 return temp._header._bits;
268 }
269
270 ProfileData* data_in();
271
272 int size_in_bytes() {
273 int cells = cell_count();
274 assert(cells >= 0, "invalid number of cells");
275 return DataLayout::compute_size_in_bytes(cells);
276 }
277 int cell_count();
278
279 // GC support
280 void clean_weak_klass_links(bool always_clean);
281 };
282
283
284 // ProfileData class hierarchy
285 class ProfileData;
286 class BitData;
287 class CounterData;
288 class ReceiverTypeData;
289 class VirtualCallData;
290 class VirtualCallTypeData;
291 class RetData;
292 class CallTypeData;
293 class JumpData;
294 class BranchData;
295 class ArrayData;
296 class MultiBranchData;
297 class ArgInfoData;
298 class ParametersTypeData;
299 class SpeculativeTrapData;
300
301 // ProfileData
302 //
303 // A ProfileData object is created to refer to a section of profiling
304 // data in a structured way.
305 class ProfileData : public ResourceObj {
306 friend class TypeEntries;
307 friend class ReturnTypeEntry;
308 friend class TypeStackSlotEntries;
309 private:
310 enum {
311 tab_width_one = 16,
312 tab_width_two = 36
313 };
314
315 // This is a pointer to a section of profiling data.
316 DataLayout* _data;
317
318 char* print_data_on_helper(const MethodData* md) const;
319
320 protected:
321 DataLayout* data() { return _data; }
322 const DataLayout* data() const { return _data; }
323
324 enum {
325 cell_size = DataLayout::cell_size
326 };
327
328 public:
329 // How many cells are in this?
330 virtual int cell_count() const {
331 ShouldNotReachHere();
332 return -1;
333 }
334
335 // Return the size of this data.
336 int size_in_bytes() {
337 return DataLayout::compute_size_in_bytes(cell_count());
338 }
339
340 protected:
341 // Low-level accessors for underlying data
342 void set_intptr_at(int index, intptr_t value) {
343 assert(0 <= index && index < cell_count(), "oob");
344 data()->set_cell_at(index, value);
345 }
346 void release_set_intptr_at(int index, intptr_t value);
347 intptr_t intptr_at(int index) const {
348 assert(0 <= index && index < cell_count(), "oob");
349 return data()->cell_at(index);
350 }
351 intptr_t* intptr_at_adr(int index) const {
352 assert(0 <= index && index < cell_count(), "oob");
353 return data()->cell_at_adr(index);
354 }
355 void set_uint_at(int index, uint value) {
356 set_intptr_at(index, (intptr_t) value);
357 }
358 void release_set_uint_at(int index, uint value);
359 uint uint_at(int index) const {
360 return (uint)intptr_at(index);
361 }
362 void set_int_at(int index, int value) {
363 set_intptr_at(index, (intptr_t) value);
364 }
365 void release_set_int_at(int index, int value);
366 int int_at(int index) const {
367 return (int)intptr_at(index);
368 }
369 int int_at_unchecked(int index) const {
370 return (int)data()->cell_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 // CDS support
493 virtual void metaspace_pointers_do(MetaspaceClosure* it) {}
494
495 // CI translation: ProfileData can represent both MethodDataOop data
496 // as well as CIMethodData data. This function is provided for translating
497 // an oop in a ProfileData to the ci equivalent. Generally speaking,
498 // most ProfileData don't require any translation, so we provide the null
499 // translation here, and the required translators are in the ci subclasses.
500 virtual void translate_from(const ProfileData* data) {}
501
502 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const {
503 ShouldNotReachHere();
504 }
505
506 void print_data_on(outputStream* st, const MethodData* md) const;
507
508 void print_shared(outputStream* st, const char* name, const char* extra) const;
509 void tab(outputStream* st, bool first = false) const;
510 };
511
512 // BitData
513 //
514 // A BitData holds a flag or two in its header.
515 class BitData : public ProfileData {
516 friend class VMStructs;
517 friend class JVMCIVMStructs;
518 protected:
519 enum : u1 {
520 // null_seen:
521 // saw a null operand (cast/aastore/instanceof)
522 null_seen_flag = DataLayout::first_flag + 0,
523 exception_handler_entered_flag = null_seen_flag + 1,
524 deprecated_method_callsite_flag = exception_handler_entered_flag + 1
525 #if INCLUDE_JVMCI
526 // bytecode threw any exception
527 , exception_seen_flag = deprecated_method_callsite_flag + 1
528 #endif
529 };
530 enum { bit_cell_count = 0 }; // no additional data fields needed.
531 public:
532 BitData(DataLayout* layout) : ProfileData(layout) {
533 }
534
535 virtual bool is_BitData() const { return true; }
536
537 static int static_cell_count() {
538 return bit_cell_count;
539 }
540
541 virtual int cell_count() const {
542 return static_cell_count();
543 }
544
545 // Accessor
546
547 // The null_seen flag bit is specially known to the interpreter.
548 // Consulting it allows the compiler to avoid setting up null_check traps.
549 bool null_seen() { return flag_at(null_seen_flag); }
550 void set_null_seen() { set_flag_at(null_seen_flag); }
551 bool deprecated_method_call_site() const { return flag_at(deprecated_method_callsite_flag); }
552 bool set_deprecated_method_call_site() { return data()->set_flag_at(deprecated_method_callsite_flag); }
553 bool clear_deprecated_method_call_site() { return data()->clear_flag_at(deprecated_method_callsite_flag); }
554
555 #if INCLUDE_JVMCI
556 // true if an exception was thrown at the specific BCI
557 bool exception_seen() { return flag_at(exception_seen_flag); }
558 void set_exception_seen() { set_flag_at(exception_seen_flag); }
559 #endif
560
561 // true if a ex handler block at this bci was entered
562 bool exception_handler_entered() { return flag_at(exception_handler_entered_flag); }
563 void set_exception_handler_entered() { set_flag_at(exception_handler_entered_flag); }
564
565 // Code generation support
566 static u1 null_seen_byte_constant() {
567 return flag_number_to_constant(null_seen_flag);
568 }
569
570 static ByteSize bit_data_size() {
571 return cell_offset(bit_cell_count);
572 }
573
574 void print_data_on(outputStream* st, const char* extra = nullptr) const;
575 };
576
577 // CounterData
578 //
579 // A CounterData corresponds to a simple counter.
580 class CounterData : public BitData {
581 friend class VMStructs;
582 friend class JVMCIVMStructs;
583 protected:
584 enum {
585 count_off,
586 counter_cell_count
587 };
588 public:
589 CounterData(DataLayout* layout) : BitData(layout) {}
590
591 virtual bool is_CounterData() const { return true; }
592
593 static int static_cell_count() {
594 return counter_cell_count;
595 }
596
597 virtual int cell_count() const {
598 return static_cell_count();
599 }
600
601 // Direct accessor
602 int count() const {
603 intptr_t raw_data = intptr_at(count_off);
604 if (raw_data > max_jint) {
605 raw_data = max_jint;
606 } else if (raw_data < min_jint) {
607 raw_data = min_jint;
608 }
609 return int(raw_data);
610 }
611
612 // Code generation support
613 static ByteSize count_offset() {
614 return cell_offset(count_off);
615 }
616 static ByteSize counter_data_size() {
617 return cell_offset(counter_cell_count);
618 }
619
620 void set_count(int count) {
621 set_int_at(count_off, count);
622 }
623
624 void print_data_on(outputStream* st, const char* extra = nullptr) const;
625 };
626
627 // JumpData
628 //
629 // A JumpData is used to access profiling information for a direct
630 // branch. It is a counter, used for counting the number of branches,
631 // plus a data displacement, used for realigning the data pointer to
632 // the corresponding target bci.
633 class JumpData : public ProfileData {
634 friend class VMStructs;
635 friend class JVMCIVMStructs;
636 protected:
637 enum {
638 taken_off_set,
639 displacement_off_set,
640 jump_cell_count
641 };
642
643 void set_displacement(int displacement) {
644 set_int_at(displacement_off_set, displacement);
645 }
646
647 public:
648 JumpData(DataLayout* layout) : ProfileData(layout) {
649 assert(layout->tag() == DataLayout::jump_data_tag ||
650 layout->tag() == DataLayout::branch_data_tag, "wrong type");
651 }
652
653 virtual bool is_JumpData() const { return true; }
654
655 static int static_cell_count() {
656 return jump_cell_count;
657 }
658
659 virtual int cell_count() const {
660 return static_cell_count();
661 }
662
663 // Direct accessor
664 uint taken() const {
665 return uint_at(taken_off_set);
666 }
667
668 void set_taken(uint cnt) {
669 set_uint_at(taken_off_set, cnt);
670 }
671
672 // Saturating counter
673 uint inc_taken() {
674 uint cnt = taken() + 1;
675 // Did we wrap? Will compiler screw us??
676 if (cnt == 0) cnt--;
677 set_uint_at(taken_off_set, cnt);
678 return cnt;
679 }
680
681 int displacement() const {
682 return int_at(displacement_off_set);
683 }
684
685 // Code generation support
686 static ByteSize taken_offset() {
687 return cell_offset(taken_off_set);
688 }
689
690 static ByteSize displacement_offset() {
691 return cell_offset(displacement_off_set);
692 }
693
694 // Specific initialization.
695 void post_initialize(BytecodeStream* stream, MethodData* mdo);
696
697 void print_data_on(outputStream* st, const char* extra = nullptr) const;
698 };
699
700 // Entries in a ProfileData object to record types: it can either be
701 // none (no profile), unknown (conflicting profile data) or a klass if
702 // a single one is seen. Whether a null reference was seen is also
703 // recorded. No counter is associated with the type and a single type
704 // is tracked (unlike VirtualCallData).
705 class TypeEntries {
706
707 public:
708
709 // A single cell is used to record information for a type:
710 // - the cell is initialized to 0
711 // - when a type is discovered it is stored in the cell
712 // - bit zero of the cell is used to record whether a null reference
713 // was encountered or not
714 // - bit 1 is set to record a conflict in the type information
715
716 enum {
717 null_seen = 1,
718 type_mask = ~null_seen,
719 type_unknown = 2,
720 status_bits = null_seen | type_unknown,
721 type_klass_mask = ~status_bits
722 };
723
724 // what to initialize a cell to
725 static intptr_t type_none() {
726 return 0;
727 }
728
729 // null seen = bit 0 set?
730 static bool was_null_seen(intptr_t v) {
731 return (v & null_seen) != 0;
732 }
733
734 // conflicting type information = bit 1 set?
735 static bool is_type_unknown(intptr_t v) {
736 return (v & type_unknown) != 0;
737 }
738
739 // not type information yet = all bits cleared, ignoring bit 0?
740 static bool is_type_none(intptr_t v) {
741 return (v & type_mask) == 0;
742 }
743
744 // recorded type: cell without bit 0 and 1
745 static intptr_t klass_part(intptr_t v) {
746 intptr_t r = v & type_klass_mask;
747 return r;
748 }
749
750 // type recorded
751 static Klass* valid_klass(intptr_t k) {
752 if (!is_type_none(k) &&
753 !is_type_unknown(k)) {
754 Klass* res = (Klass*)klass_part(k);
755 assert(res != nullptr, "invalid");
756 return res;
757 } else {
758 return nullptr;
759 }
760 }
761
762 static intptr_t with_status(intptr_t k, intptr_t in) {
763 return k | (in & status_bits);
764 }
765
766 static intptr_t with_status(Klass* k, intptr_t in) {
767 return with_status((intptr_t)k, in);
768 }
769
770 static void print_klass(outputStream* st, intptr_t k);
771
772 protected:
773 // ProfileData object these entries are part of
774 ProfileData* _pd;
775 // offset within the ProfileData object where the entries start
776 const int _base_off;
777
778 TypeEntries(int base_off)
779 : _pd(nullptr), _base_off(base_off) {}
780
781 void set_intptr_at(int index, intptr_t value) {
782 _pd->set_intptr_at(index, value);
783 }
784
785 intptr_t intptr_at(int index) const {
786 return _pd->intptr_at(index);
787 }
788
789 public:
790 void set_profile_data(ProfileData* pd) {
791 _pd = pd;
792 }
793 };
794
795 // Type entries used for arguments passed at a call and parameters on
796 // method entry. 2 cells per entry: one for the type encoded as in
797 // TypeEntries and one initialized with the stack slot where the
798 // profiled object is to be found so that the interpreter can locate
799 // it quickly.
800 class TypeStackSlotEntries : public TypeEntries {
801
802 private:
803 enum {
804 stack_slot_entry,
805 type_entry,
806 per_arg_cell_count
807 };
808
809 // offset of cell for stack slot for entry i within ProfileData object
810 int stack_slot_offset(int i) const {
811 return _base_off + stack_slot_local_offset(i);
812 }
813
814 const int _number_of_entries;
815
816 // offset of cell for type for entry i within ProfileData object
817 int type_offset_in_cells(int i) const {
818 return _base_off + type_local_offset(i);
819 }
820
821 public:
822
823 TypeStackSlotEntries(int base_off, int nb_entries)
824 : TypeEntries(base_off), _number_of_entries(nb_entries) {}
825
826 static int compute_cell_count(Symbol* signature, bool include_receiver, int max);
827
828 void post_initialize(Symbol* signature, bool has_receiver, bool include_receiver);
829
830 int number_of_entries() const { return _number_of_entries; }
831
832 // offset of cell for stack slot for entry i within this block of cells for a TypeStackSlotEntries
833 static int stack_slot_local_offset(int i) {
834 return i * per_arg_cell_count + stack_slot_entry;
835 }
836
837 // offset of cell for type for entry i within this block of cells for a TypeStackSlotEntries
838 static int type_local_offset(int i) {
839 return i * per_arg_cell_count + type_entry;
840 }
841
842 // stack slot for entry i
843 uint stack_slot(int i) const {
844 assert(i >= 0 && i < _number_of_entries, "oob");
845 return _pd->uint_at(stack_slot_offset(i));
846 }
847
848 // set stack slot for entry i
849 void set_stack_slot(int i, uint num) {
850 assert(i >= 0 && i < _number_of_entries, "oob");
851 _pd->set_uint_at(stack_slot_offset(i), num);
852 }
853
854 // type for entry i
855 intptr_t type(int i) const {
856 assert(i >= 0 && i < _number_of_entries, "oob");
857 return _pd->intptr_at(type_offset_in_cells(i));
858 }
859
860 intptr_t* type_adr(int i) const {
861 assert(i >= 0 && i < _number_of_entries, "oob");
862 return _pd->intptr_at_adr(type_offset_in_cells(i));
863 }
864
865 // set type for entry i
866 void set_type(int i, intptr_t k) {
867 assert(i >= 0 && i < _number_of_entries, "oob");
868 _pd->set_intptr_at(type_offset_in_cells(i), k);
869 }
870
871 static ByteSize per_arg_size() {
872 return in_ByteSize(per_arg_cell_count * DataLayout::cell_size);
873 }
874
875 static int per_arg_count() {
876 return per_arg_cell_count;
877 }
878
879 ByteSize type_offset(int i) const {
880 return DataLayout::cell_offset(type_offset_in_cells(i));
881 }
882
883 // GC support
884 void clean_weak_klass_links(bool always_clean);
885
886 // CDS support
887 virtual void metaspace_pointers_do(MetaspaceClosure* it);
888
889 void print_data_on(outputStream* st) const;
890 };
891
892 // Type entry used for return from a call. A single cell to record the
893 // type.
894 class ReturnTypeEntry : public TypeEntries {
895
896 private:
897 enum {
898 cell_count = 1
899 };
900
901 public:
902 ReturnTypeEntry(int base_off)
903 : TypeEntries(base_off) {}
904
905 void post_initialize() {
906 set_type(type_none());
907 }
908
909 intptr_t type() const {
910 return _pd->intptr_at(_base_off);
911 }
912
913 intptr_t* type_adr() const {
914 return _pd->intptr_at_adr(_base_off);
915 }
916
917 void set_type(intptr_t k) {
918 _pd->set_intptr_at(_base_off, k);
919 }
920
921 static int static_cell_count() {
922 return cell_count;
923 }
924
925 static ByteSize size() {
926 return in_ByteSize(cell_count * DataLayout::cell_size);
927 }
928
929 ByteSize type_offset() {
930 return DataLayout::cell_offset(_base_off);
931 }
932
933 // GC support
934 void clean_weak_klass_links(bool always_clean);
935
936 // CDS support
937 virtual void metaspace_pointers_do(MetaspaceClosure* it);
938
939 void print_data_on(outputStream* st) const;
940 };
941
942 // Entries to collect type information at a call: contains arguments
943 // (TypeStackSlotEntries), a return type (ReturnTypeEntry) and a
944 // number of cells. Because the number of cells for the return type is
945 // smaller than the number of cells for the type of an arguments, the
946 // number of cells is used to tell how many arguments are profiled and
947 // whether a return value is profiled. See has_arguments() and
948 // has_return().
949 class TypeEntriesAtCall {
950 private:
951 static int stack_slot_local_offset(int i) {
952 return header_cell_count() + TypeStackSlotEntries::stack_slot_local_offset(i);
953 }
954
955 static int argument_type_local_offset(int i) {
956 return header_cell_count() + TypeStackSlotEntries::type_local_offset(i);
957 }
958
959 public:
960
961 static int header_cell_count() {
962 return 1;
963 }
964
965 static int cell_count_local_offset() {
966 return 0;
967 }
968
969 static int compute_cell_count(BytecodeStream* stream);
970
971 static void initialize(DataLayout* dl, int base, int cell_count) {
972 int off = base + cell_count_local_offset();
973 dl->set_cell_at(off, cell_count - base - header_cell_count());
974 }
975
976 static bool arguments_profiling_enabled();
977 static bool return_profiling_enabled();
978
979 // Code generation support
980 static ByteSize cell_count_offset() {
981 return in_ByteSize(cell_count_local_offset() * DataLayout::cell_size);
982 }
983
984 static ByteSize args_data_offset() {
985 return in_ByteSize(header_cell_count() * DataLayout::cell_size);
986 }
987
988 static ByteSize stack_slot_offset(int i) {
989 return in_ByteSize(stack_slot_local_offset(i) * DataLayout::cell_size);
990 }
991
992 static ByteSize argument_type_offset(int i) {
993 return in_ByteSize(argument_type_local_offset(i) * DataLayout::cell_size);
994 }
995
996 static ByteSize return_only_size() {
997 return ReturnTypeEntry::size() + in_ByteSize(header_cell_count() * DataLayout::cell_size);
998 }
999
1000 };
1001
1002 // CallTypeData
1003 //
1004 // A CallTypeData is used to access profiling information about a non
1005 // virtual call for which we collect type information about arguments
1006 // and return value.
1007 class CallTypeData : public CounterData {
1008 private:
1009 // entries for arguments if any
1010 TypeStackSlotEntries _args;
1011 // entry for return type if any
1012 ReturnTypeEntry _ret;
1013
1014 int cell_count_global_offset() const {
1015 return CounterData::static_cell_count() + TypeEntriesAtCall::cell_count_local_offset();
1016 }
1017
1018 // number of cells not counting the header
1019 int cell_count_no_header() const {
1020 return uint_at(cell_count_global_offset());
1021 }
1022
1023 void check_number_of_arguments(int total) {
1024 assert(number_of_arguments() == total, "should be set in DataLayout::initialize");
1025 }
1026
1027 public:
1028 CallTypeData(DataLayout* layout) :
1029 CounterData(layout),
1030 _args(CounterData::static_cell_count()+TypeEntriesAtCall::header_cell_count(), number_of_arguments()),
1031 _ret(cell_count() - ReturnTypeEntry::static_cell_count())
1032 {
1033 assert(layout->tag() == DataLayout::call_type_data_tag, "wrong type");
1034 // Some compilers (VC++) don't want this passed in member initialization list
1035 _args.set_profile_data(this);
1036 _ret.set_profile_data(this);
1037 }
1038
1039 const TypeStackSlotEntries* args() const {
1040 assert(has_arguments(), "no profiling of arguments");
1041 return &_args;
1042 }
1043
1044 const ReturnTypeEntry* ret() const {
1045 assert(has_return(), "no profiling of return value");
1046 return &_ret;
1047 }
1048
1049 virtual bool is_CallTypeData() const { return true; }
1050
1051 static int static_cell_count() {
1052 return -1;
1053 }
1054
1055 static int compute_cell_count(BytecodeStream* stream) {
1056 return CounterData::static_cell_count() + TypeEntriesAtCall::compute_cell_count(stream);
1057 }
1058
1059 static void initialize(DataLayout* dl, int cell_count) {
1060 TypeEntriesAtCall::initialize(dl, CounterData::static_cell_count(), cell_count);
1061 }
1062
1063 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1064
1065 virtual int cell_count() const {
1066 return CounterData::static_cell_count() +
1067 TypeEntriesAtCall::header_cell_count() +
1068 int_at_unchecked(cell_count_global_offset());
1069 }
1070
1071 int number_of_arguments() const {
1072 return cell_count_no_header() / TypeStackSlotEntries::per_arg_count();
1073 }
1074
1075 void set_argument_type(int i, Klass* k) {
1076 assert(has_arguments(), "no arguments!");
1077 intptr_t current = _args.type(i);
1078 _args.set_type(i, TypeEntries::with_status(k, current));
1079 }
1080
1081 void set_return_type(Klass* k) {
1082 assert(has_return(), "no return!");
1083 intptr_t current = _ret.type();
1084 _ret.set_type(TypeEntries::with_status(k, current));
1085 }
1086
1087 // An entry for a return value takes less space than an entry for an
1088 // argument so if the number of cells exceeds the number of cells
1089 // needed for an argument, this object contains type information for
1090 // at least one argument.
1091 bool has_arguments() const {
1092 bool res = cell_count_no_header() >= TypeStackSlotEntries::per_arg_count();
1093 assert (!res || TypeEntriesAtCall::arguments_profiling_enabled(), "no profiling of arguments");
1094 return res;
1095 }
1096
1097 // An entry for a return value takes less space than an entry for an
1098 // argument, so if the remainder of the number of cells divided by
1099 // the number of cells for an argument is not null, a return value
1100 // is profiled in this object.
1101 bool has_return() const {
1102 bool res = (cell_count_no_header() % TypeStackSlotEntries::per_arg_count()) != 0;
1103 assert (!res || TypeEntriesAtCall::return_profiling_enabled(), "no profiling of return values");
1104 return res;
1105 }
1106
1107 // Code generation support
1108 static ByteSize args_data_offset() {
1109 return cell_offset(CounterData::static_cell_count()) + TypeEntriesAtCall::args_data_offset();
1110 }
1111
1112 ByteSize argument_type_offset(int i) {
1113 return _args.type_offset(i);
1114 }
1115
1116 ByteSize return_type_offset() {
1117 return _ret.type_offset();
1118 }
1119
1120 // GC support
1121 virtual void clean_weak_klass_links(bool always_clean) {
1122 if (has_arguments()) {
1123 _args.clean_weak_klass_links(always_clean);
1124 }
1125 if (has_return()) {
1126 _ret.clean_weak_klass_links(always_clean);
1127 }
1128 }
1129
1130 // CDS support
1131 virtual void metaspace_pointers_do(MetaspaceClosure* it) {
1132 if (has_arguments()) {
1133 _args.metaspace_pointers_do(it);
1134 }
1135 if (has_return()) {
1136 _ret.metaspace_pointers_do(it);
1137 }
1138 }
1139
1140 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1141 };
1142
1143 // ReceiverTypeData
1144 //
1145 // A ReceiverTypeData is used to access profiling information about a
1146 // dynamic type check. It consists of a series of (Klass*, count)
1147 // pairs which are used to store a type profile for the receiver of
1148 // the check, the associated count is incremented every time the type
1149 // is seen. A per ReceiverTypeData counter is incremented on type
1150 // overflow (when there's no more room for a not yet profiled Klass*).
1151 //
1152 // Updated by platform-specific code, for example MacroAssembler::profile_receiver_type.
1153 //
1154 class ReceiverTypeData : public CounterData {
1155 friend class VMStructs;
1156 friend class JVMCIVMStructs;
1157 protected:
1158 enum {
1159 receiver0_offset = counter_cell_count,
1160 count0_offset,
1161 receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset
1162 };
1163
1164 public:
1165 ReceiverTypeData(DataLayout* layout) : CounterData(layout) {
1166 assert(layout->tag() == DataLayout::receiver_type_data_tag ||
1167 layout->tag() == DataLayout::virtual_call_data_tag ||
1168 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1169 }
1170
1171 virtual bool is_ReceiverTypeData() const { return true; }
1172
1173 static int static_cell_count() {
1174 return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count;
1175 }
1176
1177 virtual int cell_count() const {
1178 return static_cell_count();
1179 }
1180
1181 // Direct accessors
1182 static uint row_limit() {
1183 return (uint) TypeProfileWidth;
1184 }
1185 static int receiver_cell_index(uint row) {
1186 return receiver0_offset + row * receiver_type_row_cell_count;
1187 }
1188 static int receiver_count_cell_index(uint row) {
1189 return count0_offset + row * receiver_type_row_cell_count;
1190 }
1191
1192 Klass* receiver(uint row) const {
1193 assert(row < row_limit(), "oob");
1194
1195 Klass* recv = (Klass*)intptr_at(receiver_cell_index(row));
1196 assert(recv == nullptr || recv->is_klass(), "wrong type");
1197 return recv;
1198 }
1199
1200 void set_receiver(uint row, Klass* k) {
1201 assert((uint)row < row_limit(), "oob");
1202 set_intptr_at(receiver_cell_index(row), (uintptr_t)k);
1203 }
1204
1205 uint receiver_count(uint row) const {
1206 assert(row < row_limit(), "oob");
1207 return uint_at(receiver_count_cell_index(row));
1208 }
1209
1210 void set_receiver_count(uint row, uint count) {
1211 assert(row < row_limit(), "oob");
1212 set_uint_at(receiver_count_cell_index(row), count);
1213 }
1214
1215 void clear_row(uint row) {
1216 assert(row < row_limit(), "oob");
1217 // Clear total count - indicator of polymorphic call site.
1218 // The site may look like as monomorphic after that but
1219 // it allow to have more accurate profiling information because
1220 // there was execution phase change since klasses were unloaded.
1221 // If the site is still polymorphic then MDO will be updated
1222 // to reflect it. But it could be the case that the site becomes
1223 // only bimorphic. Then keeping total count not 0 will be wrong.
1224 // Even if we use monomorphic (when it is not) for compilation
1225 // we will only have trap, deoptimization and recompile again
1226 // with updated MDO after executing method in Interpreter.
1227 // An additional receiver will be recorded in the cleaned row
1228 // during next call execution.
1229 //
1230 // Note: our profiling logic works with empty rows in any slot.
1231 // We do sorting a profiling info (ciCallProfile) for compilation.
1232 //
1233 set_count(0);
1234 set_receiver(row, nullptr);
1235 set_receiver_count(row, 0);
1236 }
1237
1238 // Code generation support
1239 static ByteSize receiver_offset(uint row) {
1240 return cell_offset(receiver_cell_index(row));
1241 }
1242 static ByteSize receiver_count_offset(uint row) {
1243 return cell_offset(receiver_count_cell_index(row));
1244 }
1245 static ByteSize receiver_type_data_size() {
1246 return cell_offset(static_cell_count());
1247 }
1248
1249 // GC support
1250 virtual void clean_weak_klass_links(bool always_clean);
1251
1252 // CDS support
1253 virtual void metaspace_pointers_do(MetaspaceClosure* it);
1254
1255 void print_receiver_data_on(outputStream* st) const;
1256 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1257 };
1258
1259 // VirtualCallData
1260 //
1261 // A VirtualCallData is used to access profiling information about a
1262 // virtual call. For now, it has nothing more than a ReceiverTypeData.
1263 class VirtualCallData : public ReceiverTypeData {
1264 public:
1265 VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) {
1266 assert(layout->tag() == DataLayout::virtual_call_data_tag ||
1267 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1268 }
1269
1270 virtual bool is_VirtualCallData() const { return true; }
1271
1272 static int static_cell_count() {
1273 // At this point we could add more profile state, e.g., for arguments.
1274 // But for now it's the same size as the base record type.
1275 return ReceiverTypeData::static_cell_count();
1276 }
1277
1278 virtual int cell_count() const {
1279 return static_cell_count();
1280 }
1281
1282 // Direct accessors
1283 static ByteSize virtual_call_data_size() {
1284 return cell_offset(static_cell_count());
1285 }
1286
1287 void print_method_data_on(outputStream* st) const NOT_JVMCI_RETURN;
1288 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1289 };
1290
1291 // VirtualCallTypeData
1292 //
1293 // A VirtualCallTypeData is used to access profiling information about
1294 // a virtual call for which we collect type information about
1295 // arguments and return value.
1296 class VirtualCallTypeData : public VirtualCallData {
1297 private:
1298 // entries for arguments if any
1299 TypeStackSlotEntries _args;
1300 // entry for return type if any
1301 ReturnTypeEntry _ret;
1302
1303 int cell_count_global_offset() const {
1304 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::cell_count_local_offset();
1305 }
1306
1307 // number of cells not counting the header
1308 int cell_count_no_header() const {
1309 return uint_at(cell_count_global_offset());
1310 }
1311
1312 void check_number_of_arguments(int total) {
1313 assert(number_of_arguments() == total, "should be set in DataLayout::initialize");
1314 }
1315
1316 public:
1317 VirtualCallTypeData(DataLayout* layout) :
1318 VirtualCallData(layout),
1319 _args(VirtualCallData::static_cell_count()+TypeEntriesAtCall::header_cell_count(), number_of_arguments()),
1320 _ret(cell_count() - ReturnTypeEntry::static_cell_count())
1321 {
1322 assert(layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1323 // Some compilers (VC++) don't want this passed in member initialization list
1324 _args.set_profile_data(this);
1325 _ret.set_profile_data(this);
1326 }
1327
1328 const TypeStackSlotEntries* args() const {
1329 assert(has_arguments(), "no profiling of arguments");
1330 return &_args;
1331 }
1332
1333 const ReturnTypeEntry* ret() const {
1334 assert(has_return(), "no profiling of return value");
1335 return &_ret;
1336 }
1337
1338 virtual bool is_VirtualCallTypeData() const { return true; }
1339
1340 static int static_cell_count() {
1341 return -1;
1342 }
1343
1344 static int compute_cell_count(BytecodeStream* stream) {
1345 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::compute_cell_count(stream);
1346 }
1347
1348 static void initialize(DataLayout* dl, int cell_count) {
1349 TypeEntriesAtCall::initialize(dl, VirtualCallData::static_cell_count(), cell_count);
1350 }
1351
1352 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1353
1354 virtual int cell_count() const {
1355 return VirtualCallData::static_cell_count() +
1356 TypeEntriesAtCall::header_cell_count() +
1357 int_at_unchecked(cell_count_global_offset());
1358 }
1359
1360 int number_of_arguments() const {
1361 return cell_count_no_header() / TypeStackSlotEntries::per_arg_count();
1362 }
1363
1364 void set_argument_type(int i, Klass* k) {
1365 assert(has_arguments(), "no arguments!");
1366 intptr_t current = _args.type(i);
1367 _args.set_type(i, TypeEntries::with_status(k, current));
1368 }
1369
1370 void set_return_type(Klass* k) {
1371 assert(has_return(), "no return!");
1372 intptr_t current = _ret.type();
1373 _ret.set_type(TypeEntries::with_status(k, current));
1374 }
1375
1376 // An entry for a return value takes less space than an entry for an
1377 // argument, so if the remainder of the number of cells divided by
1378 // the number of cells for an argument is not null, a return value
1379 // is profiled in this object.
1380 bool has_return() const {
1381 bool res = (cell_count_no_header() % TypeStackSlotEntries::per_arg_count()) != 0;
1382 assert (!res || TypeEntriesAtCall::return_profiling_enabled(), "no profiling of return values");
1383 return res;
1384 }
1385
1386 // An entry for a return value takes less space than an entry for an
1387 // argument so if the number of cells exceeds the number of cells
1388 // needed for an argument, this object contains type information for
1389 // at least one argument.
1390 bool has_arguments() const {
1391 bool res = cell_count_no_header() >= TypeStackSlotEntries::per_arg_count();
1392 assert (!res || TypeEntriesAtCall::arguments_profiling_enabled(), "no profiling of arguments");
1393 return res;
1394 }
1395
1396 // Code generation support
1397 static ByteSize args_data_offset() {
1398 return cell_offset(VirtualCallData::static_cell_count()) + TypeEntriesAtCall::args_data_offset();
1399 }
1400
1401 ByteSize argument_type_offset(int i) {
1402 return _args.type_offset(i);
1403 }
1404
1405 ByteSize return_type_offset() {
1406 return _ret.type_offset();
1407 }
1408
1409 // GC support
1410 virtual void clean_weak_klass_links(bool always_clean) {
1411 ReceiverTypeData::clean_weak_klass_links(always_clean);
1412 if (has_arguments()) {
1413 _args.clean_weak_klass_links(always_clean);
1414 }
1415 if (has_return()) {
1416 _ret.clean_weak_klass_links(always_clean);
1417 }
1418 }
1419
1420 // CDS support
1421 virtual void metaspace_pointers_do(MetaspaceClosure* it) {
1422 ReceiverTypeData::metaspace_pointers_do(it);
1423 if (has_arguments()) {
1424 _args.metaspace_pointers_do(it);
1425 }
1426 if (has_return()) {
1427 _ret.metaspace_pointers_do(it);
1428 }
1429 }
1430
1431 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1432 };
1433
1434 // RetData
1435 //
1436 // A RetData is used to access profiling information for a ret bytecode.
1437 // It is composed of a count of the number of times that the ret has
1438 // been executed, followed by a series of triples of the form
1439 // (bci, count, di) which count the number of times that some bci was the
1440 // target of the ret and cache a corresponding data displacement.
1441 class RetData : public CounterData {
1442 protected:
1443 enum {
1444 bci0_offset = counter_cell_count,
1445 count0_offset,
1446 displacement0_offset,
1447 ret_row_cell_count = (displacement0_offset + 1) - bci0_offset
1448 };
1449
1450 void set_bci(uint row, int bci) {
1451 assert((uint)row < row_limit(), "oob");
1452 set_int_at(bci0_offset + row * ret_row_cell_count, bci);
1453 }
1454 void release_set_bci(uint row, int bci);
1455 void set_bci_count(uint row, uint count) {
1456 assert((uint)row < row_limit(), "oob");
1457 set_uint_at(count0_offset + row * ret_row_cell_count, count);
1458 }
1459 void set_bci_displacement(uint row, int disp) {
1460 set_int_at(displacement0_offset + row * ret_row_cell_count, disp);
1461 }
1462
1463 public:
1464 RetData(DataLayout* layout) : CounterData(layout) {
1465 assert(layout->tag() == DataLayout::ret_data_tag, "wrong type");
1466 }
1467
1468 virtual bool is_RetData() const { return true; }
1469
1470 enum {
1471 no_bci = -1 // value of bci when bci1/2 are not in use.
1472 };
1473
1474 static int static_cell_count() {
1475 return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count;
1476 }
1477
1478 virtual int cell_count() const {
1479 return static_cell_count();
1480 }
1481
1482 static uint row_limit() {
1483 return (uint) BciProfileWidth;
1484 }
1485 static int bci_cell_index(uint row) {
1486 return bci0_offset + row * ret_row_cell_count;
1487 }
1488 static int bci_count_cell_index(uint row) {
1489 return count0_offset + row * ret_row_cell_count;
1490 }
1491 static int bci_displacement_cell_index(uint row) {
1492 return displacement0_offset + row * ret_row_cell_count;
1493 }
1494
1495 // Direct accessors
1496 int bci(uint row) const {
1497 return int_at(bci_cell_index(row));
1498 }
1499 uint bci_count(uint row) const {
1500 return uint_at(bci_count_cell_index(row));
1501 }
1502 int bci_displacement(uint row) const {
1503 return int_at(bci_displacement_cell_index(row));
1504 }
1505
1506 // Interpreter Runtime support
1507 address fixup_ret(int return_bci, MethodData* mdo);
1508
1509 // Code generation support
1510 static ByteSize bci_offset(uint row) {
1511 return cell_offset(bci_cell_index(row));
1512 }
1513 static ByteSize bci_count_offset(uint row) {
1514 return cell_offset(bci_count_cell_index(row));
1515 }
1516 static ByteSize bci_displacement_offset(uint row) {
1517 return cell_offset(bci_displacement_cell_index(row));
1518 }
1519
1520 // Specific initialization.
1521 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1522
1523 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1524 };
1525
1526 // BranchData
1527 //
1528 // A BranchData is used to access profiling data for a two-way branch.
1529 // It consists of taken and not_taken counts as well as a data displacement
1530 // for the taken case.
1531 class BranchData : public JumpData {
1532 friend class VMStructs;
1533 friend class JVMCIVMStructs;
1534 protected:
1535 enum {
1536 not_taken_off_set = jump_cell_count,
1537 branch_cell_count
1538 };
1539
1540 void set_displacement(int displacement) {
1541 set_int_at(displacement_off_set, displacement);
1542 }
1543
1544 public:
1545 BranchData(DataLayout* layout) : JumpData(layout) {
1546 assert(layout->tag() == DataLayout::branch_data_tag, "wrong type");
1547 }
1548
1549 virtual bool is_BranchData() const { return true; }
1550
1551 static int static_cell_count() {
1552 return branch_cell_count;
1553 }
1554
1555 virtual int cell_count() const {
1556 return static_cell_count();
1557 }
1558
1559 // Direct accessor
1560 uint not_taken() const {
1561 return uint_at(not_taken_off_set);
1562 }
1563
1564 void set_not_taken(uint cnt) {
1565 set_uint_at(not_taken_off_set, cnt);
1566 }
1567
1568 uint inc_not_taken() {
1569 uint cnt = not_taken() + 1;
1570 // Did we wrap? Will compiler screw us??
1571 if (cnt == 0) cnt--;
1572 set_uint_at(not_taken_off_set, cnt);
1573 return cnt;
1574 }
1575
1576 // Code generation support
1577 static ByteSize not_taken_offset() {
1578 return cell_offset(not_taken_off_set);
1579 }
1580 static ByteSize branch_data_size() {
1581 return cell_offset(branch_cell_count);
1582 }
1583
1584 // Specific initialization.
1585 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1586
1587 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1588 };
1589
1590 // ArrayData
1591 //
1592 // A ArrayData is a base class for accessing profiling data which does
1593 // not have a statically known size. It consists of an array length
1594 // and an array start.
1595 class ArrayData : public ProfileData {
1596 friend class VMStructs;
1597 friend class JVMCIVMStructs;
1598 protected:
1599 friend class DataLayout;
1600
1601 enum {
1602 array_len_off_set,
1603 array_start_off_set
1604 };
1605
1606 uint array_uint_at(int index) const {
1607 int aindex = index + array_start_off_set;
1608 return uint_at(aindex);
1609 }
1610 int array_int_at(int index) const {
1611 int aindex = index + array_start_off_set;
1612 return int_at(aindex);
1613 }
1614 void array_set_int_at(int index, int value) {
1615 int aindex = index + array_start_off_set;
1616 set_int_at(aindex, value);
1617 }
1618
1619 // Code generation support for subclasses.
1620 static ByteSize array_element_offset(int index) {
1621 return cell_offset(array_start_off_set + index);
1622 }
1623
1624 public:
1625 ArrayData(DataLayout* layout) : ProfileData(layout) {}
1626
1627 virtual bool is_ArrayData() const { return true; }
1628
1629 static int static_cell_count() {
1630 return -1;
1631 }
1632
1633 int array_len() const {
1634 return int_at_unchecked(array_len_off_set);
1635 }
1636
1637 virtual int cell_count() const {
1638 return array_len() + 1;
1639 }
1640
1641 // Code generation support
1642 static ByteSize array_len_offset() {
1643 return cell_offset(array_len_off_set);
1644 }
1645 static ByteSize array_start_offset() {
1646 return cell_offset(array_start_off_set);
1647 }
1648 };
1649
1650 // MultiBranchData
1651 //
1652 // A MultiBranchData is used to access profiling information for
1653 // a multi-way branch (*switch bytecodes). It consists of a series
1654 // of (count, displacement) pairs, which count the number of times each
1655 // case was taken and specify the data displacement for each branch target.
1656 class MultiBranchData : public ArrayData {
1657 friend class VMStructs;
1658 friend class JVMCIVMStructs;
1659 protected:
1660 enum {
1661 default_count_off_set,
1662 default_disaplacement_off_set,
1663 case_array_start
1664 };
1665 enum {
1666 relative_count_off_set,
1667 relative_displacement_off_set,
1668 per_case_cell_count
1669 };
1670
1671 void set_default_displacement(int displacement) {
1672 array_set_int_at(default_disaplacement_off_set, displacement);
1673 }
1674 void set_displacement_at(int index, int displacement) {
1675 array_set_int_at(case_array_start +
1676 index * per_case_cell_count +
1677 relative_displacement_off_set,
1678 displacement);
1679 }
1680
1681 public:
1682 MultiBranchData(DataLayout* layout) : ArrayData(layout) {
1683 assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type");
1684 }
1685
1686 virtual bool is_MultiBranchData() const { return true; }
1687
1688 static int compute_cell_count(BytecodeStream* stream);
1689
1690 int number_of_cases() const {
1691 int alen = array_len() - 2; // get rid of default case here.
1692 assert(alen % per_case_cell_count == 0, "must be even");
1693 return (alen / per_case_cell_count);
1694 }
1695
1696 uint default_count() const {
1697 return array_uint_at(default_count_off_set);
1698 }
1699 int default_displacement() const {
1700 return array_int_at(default_disaplacement_off_set);
1701 }
1702
1703 uint count_at(int index) const {
1704 return array_uint_at(case_array_start +
1705 index * per_case_cell_count +
1706 relative_count_off_set);
1707 }
1708 int displacement_at(int index) const {
1709 return array_int_at(case_array_start +
1710 index * per_case_cell_count +
1711 relative_displacement_off_set);
1712 }
1713
1714 // Code generation support
1715 static ByteSize default_count_offset() {
1716 return array_element_offset(default_count_off_set);
1717 }
1718 static ByteSize default_displacement_offset() {
1719 return array_element_offset(default_disaplacement_off_set);
1720 }
1721 static ByteSize case_count_offset(int index) {
1722 return case_array_offset() +
1723 (per_case_size() * index) +
1724 relative_count_offset();
1725 }
1726 static ByteSize case_array_offset() {
1727 return array_element_offset(case_array_start);
1728 }
1729 static ByteSize per_case_size() {
1730 return in_ByteSize(per_case_cell_count) * cell_size;
1731 }
1732 static ByteSize relative_count_offset() {
1733 return in_ByteSize(relative_count_off_set) * cell_size;
1734 }
1735 static ByteSize relative_displacement_offset() {
1736 return in_ByteSize(relative_displacement_off_set) * cell_size;
1737 }
1738
1739 // Specific initialization.
1740 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1741
1742 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1743 };
1744
1745 class ArgInfoData : public ArrayData {
1746
1747 public:
1748 ArgInfoData(DataLayout* layout) : ArrayData(layout) {
1749 assert(layout->tag() == DataLayout::arg_info_data_tag, "wrong type");
1750 }
1751
1752 virtual bool is_ArgInfoData() const { return true; }
1753
1754
1755 int size_of_args() const {
1756 return array_len();
1757 }
1758
1759 uint arg_modified(int arg) const {
1760 return array_uint_at(arg);
1761 }
1762
1763 void set_arg_modified(int arg, uint val) {
1764 array_set_int_at(arg, val);
1765 }
1766
1767 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1768 };
1769
1770 // ParametersTypeData
1771 //
1772 // A ParametersTypeData is used to access profiling information about
1773 // types of parameters to a method
1774 class ParametersTypeData : public ArrayData {
1775
1776 private:
1777 TypeStackSlotEntries _parameters;
1778
1779 static int stack_slot_local_offset(int i) {
1780 assert_profiling_enabled();
1781 return array_start_off_set + TypeStackSlotEntries::stack_slot_local_offset(i);
1782 }
1783
1784 static int type_local_offset(int i) {
1785 assert_profiling_enabled();
1786 return array_start_off_set + TypeStackSlotEntries::type_local_offset(i);
1787 }
1788
1789 static bool profiling_enabled();
1790 static void assert_profiling_enabled() {
1791 assert(profiling_enabled(), "method parameters profiling should be on");
1792 }
1793
1794 public:
1795 ParametersTypeData(DataLayout* layout) : ArrayData(layout), _parameters(1, number_of_parameters()) {
1796 assert(layout->tag() == DataLayout::parameters_type_data_tag, "wrong type");
1797 // Some compilers (VC++) don't want this passed in member initialization list
1798 _parameters.set_profile_data(this);
1799 }
1800
1801 static int compute_cell_count(Method* m);
1802
1803 virtual bool is_ParametersTypeData() const { return true; }
1804
1805 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1806
1807 int number_of_parameters() const {
1808 return array_len() / TypeStackSlotEntries::per_arg_count();
1809 }
1810
1811 const TypeStackSlotEntries* parameters() const { return &_parameters; }
1812
1813 uint stack_slot(int i) const {
1814 return _parameters.stack_slot(i);
1815 }
1816
1817 void set_type(int i, Klass* k) {
1818 intptr_t current = _parameters.type(i);
1819 _parameters.set_type(i, TypeEntries::with_status((intptr_t)k, current));
1820 }
1821
1822 virtual void clean_weak_klass_links(bool always_clean) {
1823 _parameters.clean_weak_klass_links(always_clean);
1824 }
1825
1826 // CDS support
1827 virtual void metaspace_pointers_do(MetaspaceClosure* it) {
1828 _parameters.metaspace_pointers_do(it);
1829 }
1830
1831 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1832
1833 static ByteSize stack_slot_offset(int i) {
1834 return cell_offset(stack_slot_local_offset(i));
1835 }
1836
1837 static ByteSize type_offset(int i) {
1838 return cell_offset(type_local_offset(i));
1839 }
1840 };
1841
1842 // SpeculativeTrapData
1843 //
1844 // A SpeculativeTrapData is used to record traps due to type
1845 // speculation. It records the root of the compilation: that type
1846 // speculation is wrong in the context of one compilation (for
1847 // method1) doesn't mean it's wrong in the context of another one (for
1848 // method2). Type speculation could have more/different data in the
1849 // context of the compilation of method2 and it's worthwhile to try an
1850 // optimization that failed for compilation of method1 in the context
1851 // of compilation of method2.
1852 // Space for SpeculativeTrapData entries is allocated from the extra
1853 // data space in the MDO. If we run out of space, the trap data for
1854 // the ProfileData at that bci is updated.
1855 class SpeculativeTrapData : public ProfileData {
1856 protected:
1857 enum {
1858 speculative_trap_method,
1859 #ifndef _LP64
1860 // The size of the area for traps is a multiple of the header
1861 // size, 2 cells on 32 bits. Packed at the end of this area are
1862 // argument info entries (with tag
1863 // DataLayout::arg_info_data_tag). The logic in
1864 // MethodData::bci_to_extra_data() that guarantees traps don't
1865 // overflow over argument info entries assumes the size of a
1866 // SpeculativeTrapData is twice the header size. On 32 bits, a
1867 // SpeculativeTrapData must be 4 cells.
1868 padding,
1869 #endif
1870 speculative_trap_cell_count
1871 };
1872 public:
1873 SpeculativeTrapData(DataLayout* layout) : ProfileData(layout) {
1874 assert(layout->tag() == DataLayout::speculative_trap_data_tag, "wrong type");
1875 }
1876
1877 virtual bool is_SpeculativeTrapData() const { return true; }
1878
1879 static int static_cell_count() {
1880 return speculative_trap_cell_count;
1881 }
1882
1883 virtual int cell_count() const {
1884 return static_cell_count();
1885 }
1886
1887 // Direct accessor
1888 Method* method() const {
1889 return (Method*)intptr_at(speculative_trap_method);
1890 }
1891
1892 void set_method(Method* m) {
1893 assert(!m->is_old(), "cannot add old methods");
1894 set_intptr_at(speculative_trap_method, (intptr_t)m);
1895 }
1896
1897 static ByteSize method_offset() {
1898 return cell_offset(speculative_trap_method);
1899 }
1900
1901 // CDS support
1902 virtual void metaspace_pointers_do(MetaspaceClosure* it);
1903
1904 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1905 };
1906
1907 // MethodData*
1908 //
1909 // A MethodData* holds information which has been collected about
1910 // a method. Its layout looks like this:
1911 //
1912 // -----------------------------
1913 // | header |
1914 // | klass |
1915 // -----------------------------
1916 // | method |
1917 // | size of the MethodData* |
1918 // -----------------------------
1919 // | Data entries... |
1920 // | (variable size) |
1921 // | |
1922 // . .
1923 // . .
1924 // . .
1925 // | |
1926 // -----------------------------
1927 //
1928 // The data entry area is a heterogeneous array of DataLayouts. Each
1929 // DataLayout in the array corresponds to a specific bytecode in the
1930 // method. The entries in the array are sorted by the corresponding
1931 // bytecode. Access to the data is via resource-allocated ProfileData,
1932 // which point to the underlying blocks of DataLayout structures.
1933 //
1934 // During interpretation, if profiling in enabled, the interpreter
1935 // maintains a method data pointer (mdp), which points at the entry
1936 // in the array corresponding to the current bci. In the course of
1937 // interpretation, when a bytecode is encountered that has profile data
1938 // associated with it, the entry pointed to by mdp is updated, then the
1939 // mdp is adjusted to point to the next appropriate DataLayout. If mdp
1940 // is null to begin with, the interpreter assumes that the current method
1941 // is not (yet) being profiled.
1942 //
1943 // In MethodData* parlance, "dp" is a "data pointer", the actual address
1944 // of a DataLayout element. A "di" is a "data index", the offset in bytes
1945 // from the base of the data entry array. A "displacement" is the byte offset
1946 // in certain ProfileData objects that indicate the amount the mdp must be
1947 // adjusted in the event of a change in control flow.
1948 //
1949
1950 class CleanExtraDataClosure : public StackObj {
1951 public:
1952 virtual bool is_live(Method* m) = 0;
1953 };
1954
1955
1956 #if INCLUDE_JVMCI
1957 // Encapsulates an encoded speculation reason. These are linked together in
1958 // a list that is atomically appended to during deoptimization. Entries are
1959 // never removed from the list.
1960 // @see jdk.vm.ci.hotspot.HotSpotSpeculationLog.HotSpotSpeculationEncoding
1961 class FailedSpeculation: public CHeapObj<mtCompiler> {
1962 private:
1963 // The length of HotSpotSpeculationEncoding.toByteArray(). The data itself
1964 // is an array embedded at the end of this object.
1965 int _data_len;
1966
1967 // Next entry in a linked list.
1968 FailedSpeculation* _next;
1969
1970 FailedSpeculation(address data, int data_len);
1971
1972 FailedSpeculation** next_adr() { return &_next; }
1973
1974 // Placement new operator for inlining the speculation data into
1975 // the FailedSpeculation object.
1976 void* operator new(size_t size, size_t fs_size) throw();
1977
1978 public:
1979 char* data() { return (char*)(((address) this) + sizeof(FailedSpeculation)); }
1980 int data_len() const { return _data_len; }
1981 FailedSpeculation* next() const { return _next; }
1982
1983 // Atomically appends a speculation from nm to the list whose head is at (*failed_speculations_address).
1984 // Returns false if the FailedSpeculation object could not be allocated.
1985 static bool add_failed_speculation(nmethod* nm, FailedSpeculation** failed_speculations_address, address speculation, int speculation_len);
1986
1987 // Frees all entries in the linked list whose head is at (*failed_speculations_address).
1988 static void free_failed_speculations(FailedSpeculation** failed_speculations_address);
1989 };
1990 #endif
1991
1992 class ciMethodData;
1993
1994 class MethodData : public Metadata {
1995 friend class VMStructs;
1996 friend class JVMCIVMStructs;
1997 friend class ProfileData;
1998 friend class TypeEntriesAtCall;
1999 friend class ciMethodData;
2000 friend class VM_ReinitializeMDO;
2001
2002 // If you add a new field that points to any metaspace object, you
2003 // must add this field to MethodData::metaspace_pointers_do().
2004
2005 // Back pointer to the Method*
2006 Method* _method;
2007
2008 // Size of this oop in bytes
2009 int _size;
2010
2011 // Cached hint for bci_to_dp and bci_to_data
2012 int _hint_di;
2013
2014 Mutex* volatile _extra_data_lock;
2015
2016 MethodData(const methodHandle& method);
2017
2018 void initialize();
2019
2020 public:
2021 MethodData();
2022
2023 static MethodData* allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS);
2024
2025 virtual bool is_methodData() const { return true; }
2026
2027 // Safely reinitialize the data in the MDO. This is intended as a testing facility as the
2028 // reinitialization is performed at a safepoint so it's isn't cheap and it doesn't ensure that all
2029 // readers will see consistent profile data.
2030 void reinitialize();
2031
2032 // Whole-method sticky bits and flags
2033 enum {
2034 _trap_hist_limit = Deoptimization::Reason_TRAP_HISTORY_LENGTH,
2035 _trap_hist_mask = max_jubyte,
2036 _extra_data_count = 4 // extra DataLayout headers, for trap history
2037 }; // Public flag values
2038
2039 // Compiler-related counters.
2040 class CompilerCounters {
2041 friend class VMStructs;
2042 friend class JVMCIVMStructs;
2043
2044 uint _nof_decompiles; // count of all nmethod removals
2045 uint _nof_overflow_recompiles; // recompile count, excluding recomp. bits
2046 uint _nof_overflow_traps; // trap count, excluding _trap_hist
2047 union {
2048 intptr_t _align;
2049 // JVMCI separates trap history for OSR compilations from normal compilations
2050 u1 _array[JVMCI_ONLY(2 *) MethodData::_trap_hist_limit];
2051 } _trap_hist;
2052
2053 public:
2054 CompilerCounters() : _nof_decompiles(0), _nof_overflow_recompiles(0), _nof_overflow_traps(0) {
2055 #ifndef ZERO
2056 // Some Zero platforms do not have expected alignment, and do not use
2057 // this code. static_assert would still fire and fail for them.
2058 static_assert(sizeof(_trap_hist) % HeapWordSize == 0, "align");
2059 #endif
2060 uint size_in_words = sizeof(_trap_hist) / HeapWordSize;
2061 Copy::zero_to_words((HeapWord*) &_trap_hist, size_in_words);
2062 }
2063
2064 // Return (uint)-1 for overflow.
2065 uint trap_count(int reason) const {
2066 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2067 return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1;
2068 }
2069
2070 uint inc_trap_count(int reason) {
2071 // Count another trap, anywhere in this method.
2072 assert(reason >= 0, "must be single trap");
2073 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2074 uint cnt1 = 1 + _trap_hist._array[reason];
2075 if ((cnt1 & _trap_hist_mask) != 0) { // if no counter overflow...
2076 _trap_hist._array[reason] = (u1)cnt1;
2077 return cnt1;
2078 } else {
2079 return _trap_hist_mask + (++_nof_overflow_traps);
2080 }
2081 }
2082
2083 uint overflow_trap_count() const {
2084 return _nof_overflow_traps;
2085 }
2086 uint overflow_recompile_count() const {
2087 return _nof_overflow_recompiles;
2088 }
2089 uint inc_overflow_recompile_count() {
2090 return ++_nof_overflow_recompiles;
2091 }
2092 uint decompile_count() const {
2093 return _nof_decompiles;
2094 }
2095 uint inc_decompile_count() {
2096 return ++_nof_decompiles;
2097 }
2098
2099 // Support for code generation
2100 static ByteSize trap_history_offset() {
2101 return byte_offset_of(CompilerCounters, _trap_hist._array);
2102 }
2103 };
2104
2105 private:
2106 CompilerCounters _compiler_counters;
2107
2108 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2109 intx _eflags; // flags on escape information
2110 intx _arg_local; // bit set of non-escaping arguments
2111 intx _arg_stack; // bit set of stack-allocatable arguments
2112 intx _arg_returned; // bit set of returned arguments
2113
2114 // How many invocations has this MDO seen?
2115 // These counters are used to determine the exact age of MDO.
2116 // We need those because in tiered a method can be concurrently
2117 // executed at different levels.
2118 InvocationCounter _invocation_counter;
2119 // Same for backedges.
2120 InvocationCounter _backedge_counter;
2121 // Counter values at the time profiling started.
2122 int _invocation_counter_start;
2123 int _backedge_counter_start;
2124 uint _tenure_traps;
2125 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog
2126 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog
2127
2128 // Number of loops and blocks is computed when compiling the first
2129 // time with C1. It is used to determine if method is trivial.
2130 short _num_loops;
2131 short _num_blocks;
2132 // Does this method contain anything worth profiling?
2133 enum WouldProfile {unknown, no_profile, profile};
2134 WouldProfile _would_profile;
2135
2136 #if INCLUDE_JVMCI
2137 // Support for HotSpotMethodData.setCompiledIRSize(int)
2138 FailedSpeculation* _failed_speculations;
2139 int _jvmci_ir_size;
2140 #endif
2141
2142 // Size of _data array in bytes. (Excludes header and extra_data fields.)
2143 int _data_size;
2144
2145 // data index for the area dedicated to parameters. -1 if no
2146 // parameter profiling.
2147 enum { no_parameters = -2, parameters_uninitialized = -1 };
2148 int _parameters_type_data_di;
2149
2150 // data index of exception handler profiling data
2151 int _exception_handler_data_di;
2152
2153 // Beginning of the data entries
2154 // See comment in ciMethodData::load_data
2155 intptr_t _data[1];
2156
2157 // Helper for size computation
2158 static int compute_data_size(BytecodeStream* stream);
2159 static int bytecode_cell_count(Bytecodes::Code code);
2160 static bool is_speculative_trap_bytecode(Bytecodes::Code code);
2161 enum { no_profile_data = -1, variable_cell_count = -2 };
2162
2163 // Helper for initialization
2164 DataLayout* data_layout_at(int data_index) const {
2165 assert(data_index % sizeof(intptr_t) == 0, "unaligned");
2166 return (DataLayout*) (((address)_data) + data_index);
2167 }
2168
2169 static int single_exception_handler_data_cell_count() {
2170 return BitData::static_cell_count();
2171 }
2172
2173 static int single_exception_handler_data_size() {
2174 return DataLayout::compute_size_in_bytes(single_exception_handler_data_cell_count());
2175 }
2176
2177 DataLayout* exception_handler_data_at(int exception_handler_index) const {
2178 return data_layout_at(_exception_handler_data_di + (exception_handler_index * single_exception_handler_data_size()));
2179 }
2180
2181 int num_exception_handler_data() const {
2182 return exception_handlers_data_size() / single_exception_handler_data_size();
2183 }
2184
2185 // Initialize an individual data segment. Returns the size of
2186 // the segment in bytes.
2187 int initialize_data(BytecodeStream* stream, int data_index);
2188
2189 // Helper for data_at
2190 DataLayout* limit_data_position() const {
2191 return data_layout_at(_data_size);
2192 }
2193 bool out_of_bounds(int data_index) const {
2194 return data_index >= data_size();
2195 }
2196
2197 // Give each of the data entries a chance to perform specific
2198 // data initialization.
2199 void post_initialize(BytecodeStream* stream);
2200
2201 // hint accessors
2202 int hint_di() const { return _hint_di; }
2203 void set_hint_di(int di) {
2204 assert(!out_of_bounds(di), "hint_di out of bounds");
2205 _hint_di = di;
2206 }
2207
2208 DataLayout* data_layout_before(int bci) {
2209 // avoid SEGV on this edge case
2210 if (data_size() == 0)
2211 return nullptr;
2212 DataLayout* layout = data_layout_at(hint_di());
2213 if (layout->bci() <= bci)
2214 return layout;
2215 return data_layout_at(first_di());
2216 }
2217
2218 // What is the index of the first data entry?
2219 int first_di() const { return 0; }
2220
2221 ProfileData* bci_to_extra_data_find(int bci, Method* m, DataLayout*& dp);
2222 // Find or create an extra ProfileData:
2223 ProfileData* bci_to_extra_data(int bci, Method* m, bool create_if_missing);
2224
2225 // return the argument info cell
2226 ArgInfoData *arg_info();
2227
2228 enum {
2229 no_type_profile = 0,
2230 type_profile_jsr292 = 1,
2231 type_profile_all = 2
2232 };
2233
2234 static bool profile_jsr292(const methodHandle& m, int bci);
2235 static bool profile_unsafe(const methodHandle& m, int bci);
2236 static bool profile_memory_access(const methodHandle& m, int bci);
2237 static int profile_arguments_flag();
2238 static bool profile_all_arguments();
2239 static bool profile_arguments_for_invoke(const methodHandle& m, int bci);
2240 static int profile_return_flag();
2241 static bool profile_all_return();
2242 static bool profile_return_for_invoke(const methodHandle& m, int bci);
2243 static int profile_parameters_flag();
2244 static bool profile_parameters_jsr292_only();
2245 static bool profile_all_parameters();
2246
2247 void clean_extra_data_helper(DataLayout* dp, int shift, bool reset = false);
2248 void verify_extra_data_clean(CleanExtraDataClosure* cl);
2249
2250 DataLayout* exception_handler_bci_to_data_helper(int bci);
2251
2252 public:
2253 void clean_extra_data(CleanExtraDataClosure* cl);
2254
2255 static int header_size() {
2256 return sizeof(MethodData)/wordSize;
2257 }
2258
2259 // Compute the size of a MethodData* before it is created.
2260 static int compute_allocation_size_in_bytes(const methodHandle& method);
2261 static int compute_allocation_size_in_words(const methodHandle& method);
2262 static int compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps);
2263
2264 // Determine if a given bytecode can have profile information.
2265 static bool bytecode_has_profile(Bytecodes::Code code) {
2266 return bytecode_cell_count(code) != no_profile_data;
2267 }
2268
2269 // reset into original state
2270 void init();
2271
2272 // My size
2273 int size_in_bytes() const { return _size; }
2274 int size() const { return align_metadata_size(align_up(_size, BytesPerWord)/BytesPerWord); }
2275
2276 int invocation_count() {
2277 if (invocation_counter()->carry()) {
2278 return InvocationCounter::count_limit;
2279 }
2280 return invocation_counter()->count();
2281 }
2282 int backedge_count() {
2283 if (backedge_counter()->carry()) {
2284 return InvocationCounter::count_limit;
2285 }
2286 return backedge_counter()->count();
2287 }
2288
2289 int invocation_count_start() {
2290 if (invocation_counter()->carry()) {
2291 return 0;
2292 }
2293 return _invocation_counter_start;
2294 }
2295
2296 int backedge_count_start() {
2297 if (backedge_counter()->carry()) {
2298 return 0;
2299 }
2300 return _backedge_counter_start;
2301 }
2302
2303 int invocation_count_delta() { return invocation_count() - invocation_count_start(); }
2304 int backedge_count_delta() { return backedge_count() - backedge_count_start(); }
2305
2306 void reset_start_counters() {
2307 _invocation_counter_start = invocation_count();
2308 _backedge_counter_start = backedge_count();
2309 }
2310
2311 InvocationCounter* invocation_counter() { return &_invocation_counter; }
2312 InvocationCounter* backedge_counter() { return &_backedge_counter; }
2313
2314 #if INCLUDE_JVMCI
2315 FailedSpeculation** get_failed_speculations_address() {
2316 return &_failed_speculations;
2317 }
2318 #endif
2319
2320 #if INCLUDE_CDS
2321 void remove_unshareable_info();
2322 void restore_unshareable_info(TRAPS);
2323 #endif
2324
2325 void set_would_profile(bool p) { _would_profile = p ? profile : no_profile; }
2326 bool would_profile() const { return _would_profile != no_profile; }
2327
2328 int num_loops() const { return _num_loops; }
2329 void set_num_loops(short n) { _num_loops = n; }
2330 int num_blocks() const { return _num_blocks; }
2331 void set_num_blocks(short n) { _num_blocks = n; }
2332
2333 bool is_mature() const;
2334
2335 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2336 enum EscapeFlag {
2337 estimated = 1 << 0,
2338 return_local = 1 << 1,
2339 return_allocated = 1 << 2,
2340 allocated_escapes = 1 << 3,
2341 unknown_modified = 1 << 4
2342 };
2343
2344 intx eflags() { return _eflags; }
2345 intx arg_local() { return _arg_local; }
2346 intx arg_stack() { return _arg_stack; }
2347 intx arg_returned() { return _arg_returned; }
2348 uint arg_modified(int a);
2349 void set_eflags(intx v) { _eflags = v; }
2350 void set_arg_local(intx v) { _arg_local = v; }
2351 void set_arg_stack(intx v) { _arg_stack = v; }
2352 void set_arg_returned(intx v) { _arg_returned = v; }
2353 void set_arg_modified(int a, uint v);
2354 void clear_escape_info() { _eflags = _arg_local = _arg_stack = _arg_returned = 0; }
2355
2356 // Location and size of data area
2357 address data_base() const {
2358 return (address) _data;
2359 }
2360 int data_size() const {
2361 return _data_size;
2362 }
2363
2364 int parameters_size_in_bytes() const {
2365 return pointer_delta_as_int((address) parameters_data_limit(), (address) parameters_data_base());
2366 }
2367
2368 int exception_handlers_data_size() const {
2369 return pointer_delta_as_int((address) exception_handler_data_limit(), (address) exception_handler_data_base());
2370 }
2371
2372 // Accessors
2373 Method* method() const { return _method; }
2374
2375 // Get the data at an arbitrary (sort of) data index.
2376 ProfileData* data_at(int data_index) const;
2377
2378 // Walk through the data in order.
2379 ProfileData* first_data() const { return data_at(first_di()); }
2380 ProfileData* next_data(ProfileData* current) const;
2381 DataLayout* next_data_layout(DataLayout* current) const;
2382 bool is_valid(ProfileData* current) const { return current != nullptr; }
2383 bool is_valid(DataLayout* current) const { return current != nullptr; }
2384
2385 // Convert a dp (data pointer) to a di (data index).
2386 int dp_to_di(address dp) const {
2387 return (int)(dp - ((address)_data));
2388 }
2389
2390 // bci to di/dp conversion.
2391 address bci_to_dp(int bci);
2392 int bci_to_di(int bci) {
2393 return dp_to_di(bci_to_dp(bci));
2394 }
2395
2396 // Get the data at an arbitrary bci, or null if there is none.
2397 ProfileData* bci_to_data(int bci);
2398
2399 // Same, but try to create an extra_data record if one is needed:
2400 ProfileData* allocate_bci_to_data(int bci, Method* m) {
2401 check_extra_data_locked();
2402
2403 ProfileData* data = nullptr;
2404 // If m not null, try to allocate a SpeculativeTrapData entry
2405 if (m == nullptr) {
2406 data = bci_to_data(bci);
2407 }
2408 if (data != nullptr) {
2409 return data;
2410 }
2411 data = bci_to_extra_data(bci, m, true);
2412 if (data != nullptr) {
2413 return data;
2414 }
2415 // If SpeculativeTrapData allocation fails try to allocate a
2416 // regular entry
2417 data = bci_to_data(bci);
2418 if (data != nullptr) {
2419 return data;
2420 }
2421 return bci_to_extra_data(bci, nullptr, true);
2422 }
2423
2424 BitData* exception_handler_bci_to_data_or_null(int bci);
2425 BitData exception_handler_bci_to_data(int bci);
2426
2427 // Add a handful of extra data records, for trap tracking.
2428 // Only valid after 'set_size' is called at the end of MethodData::initialize
2429 DataLayout* extra_data_base() const {
2430 check_extra_data_locked();
2431 return limit_data_position();
2432 }
2433 DataLayout* extra_data_limit() const { return (DataLayout*)((address)this + size_in_bytes()); }
2434 // pointers to sections in extra data
2435 DataLayout* args_data_limit() const { return parameters_data_base(); }
2436 DataLayout* parameters_data_base() const {
2437 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2438 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di) : parameters_data_limit();
2439 }
2440 DataLayout* parameters_data_limit() const {
2441 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2442 return exception_handler_data_base();
2443 }
2444 DataLayout* exception_handler_data_base() const { return data_layout_at(_exception_handler_data_di); }
2445 DataLayout* exception_handler_data_limit() const { return extra_data_limit(); }
2446
2447 int extra_data_size() const { return (int)((address)extra_data_limit() - (address)limit_data_position()); }
2448 static DataLayout* next_extra(DataLayout* dp);
2449
2450 // Return (uint)-1 for overflow.
2451 uint trap_count(int reason) const {
2452 return _compiler_counters.trap_count(reason);
2453 }
2454 // For loops:
2455 static uint trap_reason_limit() { return _trap_hist_limit; }
2456 static uint trap_count_limit() { return _trap_hist_mask; }
2457 uint inc_trap_count(int reason) {
2458 return _compiler_counters.inc_trap_count(reason);
2459 }
2460
2461 uint overflow_trap_count() const {
2462 return _compiler_counters.overflow_trap_count();
2463 }
2464 uint overflow_recompile_count() const {
2465 return _compiler_counters.overflow_recompile_count();
2466 }
2467 uint inc_overflow_recompile_count() {
2468 return _compiler_counters.inc_overflow_recompile_count();
2469 }
2470 uint decompile_count() const {
2471 return _compiler_counters.decompile_count();
2472 }
2473 uint inc_decompile_count() {
2474 uint dec_count = _compiler_counters.inc_decompile_count();
2475 if (dec_count > (uint)PerMethodRecompilationCutoff) {
2476 method()->set_not_compilable("decompile_count > PerMethodRecompilationCutoff", CompLevel_full_optimization);
2477 }
2478 return dec_count;
2479 }
2480 uint tenure_traps() const {
2481 return _tenure_traps;
2482 }
2483 void inc_tenure_traps() {
2484 _tenure_traps += 1;
2485 }
2486
2487 // Return pointer to area dedicated to parameters in MDO
2488 ParametersTypeData* parameters_type_data() const {
2489 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2490 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di)->data_in()->as_ParametersTypeData() : nullptr;
2491 }
2492
2493 int parameters_type_data_di() const {
2494 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2495 return _parameters_type_data_di != no_parameters ? _parameters_type_data_di : exception_handlers_data_di();
2496 }
2497
2498 int exception_handlers_data_di() const {
2499 return _exception_handler_data_di;
2500 }
2501
2502 // Support for code generation
2503 static ByteSize data_offset() {
2504 return byte_offset_of(MethodData, _data[0]);
2505 }
2506
2507 static ByteSize trap_history_offset() {
2508 return byte_offset_of(MethodData, _compiler_counters) + CompilerCounters::trap_history_offset();
2509 }
2510
2511 static ByteSize invocation_counter_offset() {
2512 return byte_offset_of(MethodData, _invocation_counter);
2513 }
2514
2515 static ByteSize backedge_counter_offset() {
2516 return byte_offset_of(MethodData, _backedge_counter);
2517 }
2518
2519 static ByteSize invoke_mask_offset() {
2520 return byte_offset_of(MethodData, _invoke_mask);
2521 }
2522
2523 static ByteSize backedge_mask_offset() {
2524 return byte_offset_of(MethodData, _backedge_mask);
2525 }
2526
2527 static ByteSize parameters_type_data_di_offset() {
2528 return byte_offset_of(MethodData, _parameters_type_data_di);
2529 }
2530
2531 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
2532 virtual MetaspaceObj::Type type() const { return MethodDataType; }
2533
2534 // Deallocation support
2535 void deallocate_contents(ClassLoaderData* loader_data);
2536 void release_C_heap_structures();
2537
2538 // GC support
2539 void set_size(int object_size_in_bytes) { _size = object_size_in_bytes; }
2540
2541 // Printing
2542 void print_on (outputStream* st) const;
2543 void print_value_on(outputStream* st) const;
2544
2545 // printing support for method data
2546 void print_data_on(outputStream* st) const;
2547
2548 const char* internal_name() const { return "{method data}"; }
2549
2550 // verification
2551 void verify_on(outputStream* st);
2552 void verify_data_on(outputStream* st);
2553
2554 static bool profile_parameters_for_method(const methodHandle& m);
2555 static bool profile_arguments();
2556 static bool profile_arguments_jsr292_only();
2557 static bool profile_return();
2558 static bool profile_parameters();
2559 static bool profile_return_jsr292_only();
2560
2561 void clean_method_data(bool always_clean);
2562 void clean_weak_method_links();
2563 Mutex* extra_data_lock();
2564 void check_extra_data_locked() const NOT_DEBUG_RETURN;
2565 };
2566
2567 #endif // SHARE_OOPS_METHODDATA_HPP