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.
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5 * This code is free software; you can redistribute it and/or modify it
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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 "runtime/atomic.hpp"
33 #include "runtime/deoptimization.hpp"
34 #include "runtime/mutex.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/copy.hpp"
37
38 class BytecodeStream;
39
40 // The MethodData object collects counts and other profile information
41 // during zeroth-tier (interpreter) and third-tier (C1 with full profiling)
42 // execution.
43 //
44 // The profile is used later by compilation heuristics. Some heuristics
45 // enable use of aggressive (or "heroic") optimizations. An aggressive
46 // optimization often has a down-side, a corner case that it handles
47 // poorly, but which is thought to be rare. The profile provides
48 // evidence of this rarity for a given method or even BCI. It allows
49 // the compiler to back out of the optimization at places where it
50 // has historically been a poor choice. Other heuristics try to use
51 // specific information gathered about types observed at a given site.
52 //
53 // All data in the profile is approximate. It is expected to be accurate
54 // on the whole, but the system expects occasional inaccuraces, due to
55 // counter overflow, multiprocessor races during data collection, space
56 // limitations, missing MDO blocks, etc. Bad or missing data will degrade
57 // optimization quality but will not affect correctness. Also, each MDO
58 // is marked with its birth-date ("creation_mileage") which can be used
59 // to assess the quality ("maturity") of its data.
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 Atomic::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 = 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 != Atomic::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 = 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 != Atomic::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 class ReceiverTypeData : public CounterData {
1153 friend class VMStructs;
1154 friend class JVMCIVMStructs;
1155 protected:
1156 enum {
1157 receiver0_offset = counter_cell_count,
1158 count0_offset,
1159 receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset
1160 };
1161
1162 public:
1163 ReceiverTypeData(DataLayout* layout) : CounterData(layout) {
1164 assert(layout->tag() == DataLayout::receiver_type_data_tag ||
1165 layout->tag() == DataLayout::virtual_call_data_tag ||
1166 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1167 }
1168
1169 virtual bool is_ReceiverTypeData() const { return true; }
1170
1171 static int static_cell_count() {
1172 return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count;
1173 }
1174
1175 virtual int cell_count() const {
1176 return static_cell_count();
1177 }
1178
1179 // Direct accessors
1180 static uint row_limit() {
1181 return (uint) TypeProfileWidth;
1182 }
1183 static int receiver_cell_index(uint row) {
1184 return receiver0_offset + row * receiver_type_row_cell_count;
1185 }
1186 static int receiver_count_cell_index(uint row) {
1187 return count0_offset + row * receiver_type_row_cell_count;
1188 }
1189
1190 Klass* receiver(uint row) const {
1191 assert(row < row_limit(), "oob");
1192
1193 Klass* recv = (Klass*)intptr_at(receiver_cell_index(row));
1194 assert(recv == nullptr || recv->is_klass(), "wrong type");
1195 return recv;
1196 }
1197
1198 void set_receiver(uint row, Klass* k) {
1199 assert((uint)row < row_limit(), "oob");
1200 set_intptr_at(receiver_cell_index(row), (uintptr_t)k);
1201 }
1202
1203 uint receiver_count(uint row) const {
1204 assert(row < row_limit(), "oob");
1205 return uint_at(receiver_count_cell_index(row));
1206 }
1207
1208 void set_receiver_count(uint row, uint count) {
1209 assert(row < row_limit(), "oob");
1210 set_uint_at(receiver_count_cell_index(row), count);
1211 }
1212
1213 void clear_row(uint row) {
1214 assert(row < row_limit(), "oob");
1215 // Clear total count - indicator of polymorphic call site.
1216 // The site may look like as monomorphic after that but
1217 // it allow to have more accurate profiling information because
1218 // there was execution phase change since klasses were unloaded.
1219 // If the site is still polymorphic then MDO will be updated
1220 // to reflect it. But it could be the case that the site becomes
1221 // only bimorphic. Then keeping total count not 0 will be wrong.
1222 // Even if we use monomorphic (when it is not) for compilation
1223 // we will only have trap, deoptimization and recompile again
1224 // with updated MDO after executing method in Interpreter.
1225 // An additional receiver will be recorded in the cleaned row
1226 // during next call execution.
1227 //
1228 // Note: our profiling logic works with empty rows in any slot.
1229 // We do sorting a profiling info (ciCallProfile) for compilation.
1230 //
1231 set_count(0);
1232 set_receiver(row, nullptr);
1233 set_receiver_count(row, 0);
1234 }
1235
1236 // Code generation support
1237 static ByteSize receiver_offset(uint row) {
1238 return cell_offset(receiver_cell_index(row));
1239 }
1240 static ByteSize receiver_count_offset(uint row) {
1241 return cell_offset(receiver_count_cell_index(row));
1242 }
1243 static ByteSize receiver_type_data_size() {
1244 return cell_offset(static_cell_count());
1245 }
1246
1247 // GC support
1248 virtual void clean_weak_klass_links(bool always_clean);
1249
1250 // CDS support
1251 virtual void metaspace_pointers_do(MetaspaceClosure* it);
1252
1253 void print_receiver_data_on(outputStream* st) const;
1254 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1255 };
1256
1257 // VirtualCallData
1258 //
1259 // A VirtualCallData is used to access profiling information about a
1260 // virtual call. For now, it has nothing more than a ReceiverTypeData.
1261 class VirtualCallData : public ReceiverTypeData {
1262 public:
1263 VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) {
1264 assert(layout->tag() == DataLayout::virtual_call_data_tag ||
1265 layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1266 }
1267
1268 virtual bool is_VirtualCallData() const { return true; }
1269
1270 static int static_cell_count() {
1271 // At this point we could add more profile state, e.g., for arguments.
1272 // But for now it's the same size as the base record type.
1273 return ReceiverTypeData::static_cell_count();
1274 }
1275
1276 virtual int cell_count() const {
1277 return static_cell_count();
1278 }
1279
1280 // Direct accessors
1281 static ByteSize virtual_call_data_size() {
1282 return cell_offset(static_cell_count());
1283 }
1284
1285 void print_method_data_on(outputStream* st) const NOT_JVMCI_RETURN;
1286 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1287 };
1288
1289 // VirtualCallTypeData
1290 //
1291 // A VirtualCallTypeData is used to access profiling information about
1292 // a virtual call for which we collect type information about
1293 // arguments and return value.
1294 class VirtualCallTypeData : public VirtualCallData {
1295 private:
1296 // entries for arguments if any
1297 TypeStackSlotEntries _args;
1298 // entry for return type if any
1299 ReturnTypeEntry _ret;
1300
1301 int cell_count_global_offset() const {
1302 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::cell_count_local_offset();
1303 }
1304
1305 // number of cells not counting the header
1306 int cell_count_no_header() const {
1307 return uint_at(cell_count_global_offset());
1308 }
1309
1310 void check_number_of_arguments(int total) {
1311 assert(number_of_arguments() == total, "should be set in DataLayout::initialize");
1312 }
1313
1314 public:
1315 VirtualCallTypeData(DataLayout* layout) :
1316 VirtualCallData(layout),
1317 _args(VirtualCallData::static_cell_count()+TypeEntriesAtCall::header_cell_count(), number_of_arguments()),
1318 _ret(cell_count() - ReturnTypeEntry::static_cell_count())
1319 {
1320 assert(layout->tag() == DataLayout::virtual_call_type_data_tag, "wrong type");
1321 // Some compilers (VC++) don't want this passed in member initialization list
1322 _args.set_profile_data(this);
1323 _ret.set_profile_data(this);
1324 }
1325
1326 const TypeStackSlotEntries* args() const {
1327 assert(has_arguments(), "no profiling of arguments");
1328 return &_args;
1329 }
1330
1331 const ReturnTypeEntry* ret() const {
1332 assert(has_return(), "no profiling of return value");
1333 return &_ret;
1334 }
1335
1336 virtual bool is_VirtualCallTypeData() const { return true; }
1337
1338 static int static_cell_count() {
1339 return -1;
1340 }
1341
1342 static int compute_cell_count(BytecodeStream* stream) {
1343 return VirtualCallData::static_cell_count() + TypeEntriesAtCall::compute_cell_count(stream);
1344 }
1345
1346 static void initialize(DataLayout* dl, int cell_count) {
1347 TypeEntriesAtCall::initialize(dl, VirtualCallData::static_cell_count(), cell_count);
1348 }
1349
1350 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1351
1352 virtual int cell_count() const {
1353 return VirtualCallData::static_cell_count() +
1354 TypeEntriesAtCall::header_cell_count() +
1355 int_at_unchecked(cell_count_global_offset());
1356 }
1357
1358 int number_of_arguments() const {
1359 return cell_count_no_header() / TypeStackSlotEntries::per_arg_count();
1360 }
1361
1362 void set_argument_type(int i, Klass* k) {
1363 assert(has_arguments(), "no arguments!");
1364 intptr_t current = _args.type(i);
1365 _args.set_type(i, TypeEntries::with_status(k, current));
1366 }
1367
1368 void set_return_type(Klass* k) {
1369 assert(has_return(), "no return!");
1370 intptr_t current = _ret.type();
1371 _ret.set_type(TypeEntries::with_status(k, current));
1372 }
1373
1374 // An entry for a return value takes less space than an entry for an
1375 // argument, so if the remainder of the number of cells divided by
1376 // the number of cells for an argument is not null, a return value
1377 // is profiled in this object.
1378 bool has_return() const {
1379 bool res = (cell_count_no_header() % TypeStackSlotEntries::per_arg_count()) != 0;
1380 assert (!res || TypeEntriesAtCall::return_profiling_enabled(), "no profiling of return values");
1381 return res;
1382 }
1383
1384 // An entry for a return value takes less space than an entry for an
1385 // argument so if the number of cells exceeds the number of cells
1386 // needed for an argument, this object contains type information for
1387 // at least one argument.
1388 bool has_arguments() const {
1389 bool res = cell_count_no_header() >= TypeStackSlotEntries::per_arg_count();
1390 assert (!res || TypeEntriesAtCall::arguments_profiling_enabled(), "no profiling of arguments");
1391 return res;
1392 }
1393
1394 // Code generation support
1395 static ByteSize args_data_offset() {
1396 return cell_offset(VirtualCallData::static_cell_count()) + TypeEntriesAtCall::args_data_offset();
1397 }
1398
1399 ByteSize argument_type_offset(int i) {
1400 return _args.type_offset(i);
1401 }
1402
1403 ByteSize return_type_offset() {
1404 return _ret.type_offset();
1405 }
1406
1407 // GC support
1408 virtual void clean_weak_klass_links(bool always_clean) {
1409 ReceiverTypeData::clean_weak_klass_links(always_clean);
1410 if (has_arguments()) {
1411 _args.clean_weak_klass_links(always_clean);
1412 }
1413 if (has_return()) {
1414 _ret.clean_weak_klass_links(always_clean);
1415 }
1416 }
1417
1418 // CDS support
1419 virtual void metaspace_pointers_do(MetaspaceClosure* it) {
1420 ReceiverTypeData::metaspace_pointers_do(it);
1421 if (has_arguments()) {
1422 _args.metaspace_pointers_do(it);
1423 }
1424 if (has_return()) {
1425 _ret.metaspace_pointers_do(it);
1426 }
1427 }
1428
1429 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1430 };
1431
1432 // RetData
1433 //
1434 // A RetData is used to access profiling information for a ret bytecode.
1435 // It is composed of a count of the number of times that the ret has
1436 // been executed, followed by a series of triples of the form
1437 // (bci, count, di) which count the number of times that some bci was the
1438 // target of the ret and cache a corresponding data displacement.
1439 class RetData : public CounterData {
1440 protected:
1441 enum {
1442 bci0_offset = counter_cell_count,
1443 count0_offset,
1444 displacement0_offset,
1445 ret_row_cell_count = (displacement0_offset + 1) - bci0_offset
1446 };
1447
1448 void set_bci(uint row, int bci) {
1449 assert((uint)row < row_limit(), "oob");
1450 set_int_at(bci0_offset + row * ret_row_cell_count, bci);
1451 }
1452 void release_set_bci(uint row, int bci);
1453 void set_bci_count(uint row, uint count) {
1454 assert((uint)row < row_limit(), "oob");
1455 set_uint_at(count0_offset + row * ret_row_cell_count, count);
1456 }
1457 void set_bci_displacement(uint row, int disp) {
1458 set_int_at(displacement0_offset + row * ret_row_cell_count, disp);
1459 }
1460
1461 public:
1462 RetData(DataLayout* layout) : CounterData(layout) {
1463 assert(layout->tag() == DataLayout::ret_data_tag, "wrong type");
1464 }
1465
1466 virtual bool is_RetData() const { return true; }
1467
1468 enum {
1469 no_bci = -1 // value of bci when bci1/2 are not in use.
1470 };
1471
1472 static int static_cell_count() {
1473 return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count;
1474 }
1475
1476 virtual int cell_count() const {
1477 return static_cell_count();
1478 }
1479
1480 static uint row_limit() {
1481 return (uint) BciProfileWidth;
1482 }
1483 static int bci_cell_index(uint row) {
1484 return bci0_offset + row * ret_row_cell_count;
1485 }
1486 static int bci_count_cell_index(uint row) {
1487 return count0_offset + row * ret_row_cell_count;
1488 }
1489 static int bci_displacement_cell_index(uint row) {
1490 return displacement0_offset + row * ret_row_cell_count;
1491 }
1492
1493 // Direct accessors
1494 int bci(uint row) const {
1495 return int_at(bci_cell_index(row));
1496 }
1497 uint bci_count(uint row) const {
1498 return uint_at(bci_count_cell_index(row));
1499 }
1500 int bci_displacement(uint row) const {
1501 return int_at(bci_displacement_cell_index(row));
1502 }
1503
1504 // Interpreter Runtime support
1505 address fixup_ret(int return_bci, MethodData* mdo);
1506
1507 // Code generation support
1508 static ByteSize bci_offset(uint row) {
1509 return cell_offset(bci_cell_index(row));
1510 }
1511 static ByteSize bci_count_offset(uint row) {
1512 return cell_offset(bci_count_cell_index(row));
1513 }
1514 static ByteSize bci_displacement_offset(uint row) {
1515 return cell_offset(bci_displacement_cell_index(row));
1516 }
1517
1518 // Specific initialization.
1519 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1520
1521 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1522 };
1523
1524 // BranchData
1525 //
1526 // A BranchData is used to access profiling data for a two-way branch.
1527 // It consists of taken and not_taken counts as well as a data displacement
1528 // for the taken case.
1529 class BranchData : public JumpData {
1530 friend class VMStructs;
1531 friend class JVMCIVMStructs;
1532 protected:
1533 enum {
1534 not_taken_off_set = jump_cell_count,
1535 branch_cell_count
1536 };
1537
1538 void set_displacement(int displacement) {
1539 set_int_at(displacement_off_set, displacement);
1540 }
1541
1542 public:
1543 BranchData(DataLayout* layout) : JumpData(layout) {
1544 assert(layout->tag() == DataLayout::branch_data_tag, "wrong type");
1545 }
1546
1547 virtual bool is_BranchData() const { return true; }
1548
1549 static int static_cell_count() {
1550 return branch_cell_count;
1551 }
1552
1553 virtual int cell_count() const {
1554 return static_cell_count();
1555 }
1556
1557 // Direct accessor
1558 uint not_taken() const {
1559 return uint_at(not_taken_off_set);
1560 }
1561
1562 void set_not_taken(uint cnt) {
1563 set_uint_at(not_taken_off_set, cnt);
1564 }
1565
1566 uint inc_not_taken() {
1567 uint cnt = not_taken() + 1;
1568 // Did we wrap? Will compiler screw us??
1569 if (cnt == 0) cnt--;
1570 set_uint_at(not_taken_off_set, cnt);
1571 return cnt;
1572 }
1573
1574 // Code generation support
1575 static ByteSize not_taken_offset() {
1576 return cell_offset(not_taken_off_set);
1577 }
1578 static ByteSize branch_data_size() {
1579 return cell_offset(branch_cell_count);
1580 }
1581
1582 // Specific initialization.
1583 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1584
1585 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1586 };
1587
1588 // ArrayData
1589 //
1590 // A ArrayData is a base class for accessing profiling data which does
1591 // not have a statically known size. It consists of an array length
1592 // and an array start.
1593 class ArrayData : public ProfileData {
1594 friend class VMStructs;
1595 friend class JVMCIVMStructs;
1596 protected:
1597 friend class DataLayout;
1598
1599 enum {
1600 array_len_off_set,
1601 array_start_off_set
1602 };
1603
1604 uint array_uint_at(int index) const {
1605 int aindex = index + array_start_off_set;
1606 return uint_at(aindex);
1607 }
1608 int array_int_at(int index) const {
1609 int aindex = index + array_start_off_set;
1610 return int_at(aindex);
1611 }
1612 void array_set_int_at(int index, int value) {
1613 int aindex = index + array_start_off_set;
1614 set_int_at(aindex, value);
1615 }
1616
1617 // Code generation support for subclasses.
1618 static ByteSize array_element_offset(int index) {
1619 return cell_offset(array_start_off_set + index);
1620 }
1621
1622 public:
1623 ArrayData(DataLayout* layout) : ProfileData(layout) {}
1624
1625 virtual bool is_ArrayData() const { return true; }
1626
1627 static int static_cell_count() {
1628 return -1;
1629 }
1630
1631 int array_len() const {
1632 return int_at_unchecked(array_len_off_set);
1633 }
1634
1635 virtual int cell_count() const {
1636 return array_len() + 1;
1637 }
1638
1639 // Code generation support
1640 static ByteSize array_len_offset() {
1641 return cell_offset(array_len_off_set);
1642 }
1643 static ByteSize array_start_offset() {
1644 return cell_offset(array_start_off_set);
1645 }
1646 };
1647
1648 // MultiBranchData
1649 //
1650 // A MultiBranchData is used to access profiling information for
1651 // a multi-way branch (*switch bytecodes). It consists of a series
1652 // of (count, displacement) pairs, which count the number of times each
1653 // case was taken and specify the data displacement for each branch target.
1654 class MultiBranchData : public ArrayData {
1655 friend class VMStructs;
1656 friend class JVMCIVMStructs;
1657 protected:
1658 enum {
1659 default_count_off_set,
1660 default_disaplacement_off_set,
1661 case_array_start
1662 };
1663 enum {
1664 relative_count_off_set,
1665 relative_displacement_off_set,
1666 per_case_cell_count
1667 };
1668
1669 void set_default_displacement(int displacement) {
1670 array_set_int_at(default_disaplacement_off_set, displacement);
1671 }
1672 void set_displacement_at(int index, int displacement) {
1673 array_set_int_at(case_array_start +
1674 index * per_case_cell_count +
1675 relative_displacement_off_set,
1676 displacement);
1677 }
1678
1679 public:
1680 MultiBranchData(DataLayout* layout) : ArrayData(layout) {
1681 assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type");
1682 }
1683
1684 virtual bool is_MultiBranchData() const { return true; }
1685
1686 static int compute_cell_count(BytecodeStream* stream);
1687
1688 int number_of_cases() const {
1689 int alen = array_len() - 2; // get rid of default case here.
1690 assert(alen % per_case_cell_count == 0, "must be even");
1691 return (alen / per_case_cell_count);
1692 }
1693
1694 uint default_count() const {
1695 return array_uint_at(default_count_off_set);
1696 }
1697 int default_displacement() const {
1698 return array_int_at(default_disaplacement_off_set);
1699 }
1700
1701 uint count_at(int index) const {
1702 return array_uint_at(case_array_start +
1703 index * per_case_cell_count +
1704 relative_count_off_set);
1705 }
1706 int displacement_at(int index) const {
1707 return array_int_at(case_array_start +
1708 index * per_case_cell_count +
1709 relative_displacement_off_set);
1710 }
1711
1712 // Code generation support
1713 static ByteSize default_count_offset() {
1714 return array_element_offset(default_count_off_set);
1715 }
1716 static ByteSize default_displacement_offset() {
1717 return array_element_offset(default_disaplacement_off_set);
1718 }
1719 static ByteSize case_count_offset(int index) {
1720 return case_array_offset() +
1721 (per_case_size() * index) +
1722 relative_count_offset();
1723 }
1724 static ByteSize case_array_offset() {
1725 return array_element_offset(case_array_start);
1726 }
1727 static ByteSize per_case_size() {
1728 return in_ByteSize(per_case_cell_count) * cell_size;
1729 }
1730 static ByteSize relative_count_offset() {
1731 return in_ByteSize(relative_count_off_set) * cell_size;
1732 }
1733 static ByteSize relative_displacement_offset() {
1734 return in_ByteSize(relative_displacement_off_set) * cell_size;
1735 }
1736
1737 // Specific initialization.
1738 void post_initialize(BytecodeStream* stream, MethodData* mdo);
1739
1740 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1741 };
1742
1743 class ArgInfoData : public ArrayData {
1744
1745 public:
1746 ArgInfoData(DataLayout* layout) : ArrayData(layout) {
1747 assert(layout->tag() == DataLayout::arg_info_data_tag, "wrong type");
1748 }
1749
1750 virtual bool is_ArgInfoData() const { return true; }
1751
1752
1753 int number_of_args() const {
1754 return array_len();
1755 }
1756
1757 uint arg_modified(int arg) const {
1758 return array_uint_at(arg);
1759 }
1760
1761 void set_arg_modified(int arg, uint val) {
1762 array_set_int_at(arg, val);
1763 }
1764
1765 void print_data_on(outputStream* st, const char* extra = nullptr) const;
1766 };
1767
1768 // ParametersTypeData
1769 //
1770 // A ParametersTypeData is used to access profiling information about
1771 // types of parameters to a method
1772 class ParametersTypeData : public ArrayData {
1773
1774 private:
1775 TypeStackSlotEntries _parameters;
1776
1777 static int stack_slot_local_offset(int i) {
1778 assert_profiling_enabled();
1779 return array_start_off_set + TypeStackSlotEntries::stack_slot_local_offset(i);
1780 }
1781
1782 static int type_local_offset(int i) {
1783 assert_profiling_enabled();
1784 return array_start_off_set + TypeStackSlotEntries::type_local_offset(i);
1785 }
1786
1787 static bool profiling_enabled();
1788 static void assert_profiling_enabled() {
1789 assert(profiling_enabled(), "method parameters profiling should be on");
1790 }
1791
1792 public:
1793 ParametersTypeData(DataLayout* layout) : ArrayData(layout), _parameters(1, number_of_parameters()) {
1794 assert(layout->tag() == DataLayout::parameters_type_data_tag, "wrong type");
1795 // Some compilers (VC++) don't want this passed in member initialization list
1796 _parameters.set_profile_data(this);
1797 }
1798
1799 static int compute_cell_count(Method* m);
1800
1801 virtual bool is_ParametersTypeData() const { return true; }
1802
1803 virtual void post_initialize(BytecodeStream* stream, MethodData* mdo);
1804
1805 int number_of_parameters() const {
1806 return array_len() / TypeStackSlotEntries::per_arg_count();
1807 }
1808
1809 const TypeStackSlotEntries* parameters() const { return &_parameters; }
1810
1811 uint stack_slot(int i) const {
1812 return _parameters.stack_slot(i);
1813 }
1814
1815 void set_type(int i, Klass* k) {
1816 intptr_t current = _parameters.type(i);
1817 _parameters.set_type(i, TypeEntries::with_status((intptr_t)k, current));
1818 }
1819
1820 virtual void clean_weak_klass_links(bool always_clean) {
1821 _parameters.clean_weak_klass_links(always_clean);
1822 }
1823
1824 // CDS support
1825 virtual void metaspace_pointers_do(MetaspaceClosure* it) {
1826 _parameters.metaspace_pointers_do(it);
1827 }
1828
1829 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1830
1831 static ByteSize stack_slot_offset(int i) {
1832 return cell_offset(stack_slot_local_offset(i));
1833 }
1834
1835 static ByteSize type_offset(int i) {
1836 return cell_offset(type_local_offset(i));
1837 }
1838 };
1839
1840 // SpeculativeTrapData
1841 //
1842 // A SpeculativeTrapData is used to record traps due to type
1843 // speculation. It records the root of the compilation: that type
1844 // speculation is wrong in the context of one compilation (for
1845 // method1) doesn't mean it's wrong in the context of another one (for
1846 // method2). Type speculation could have more/different data in the
1847 // context of the compilation of method2 and it's worthwhile to try an
1848 // optimization that failed for compilation of method1 in the context
1849 // of compilation of method2.
1850 // Space for SpeculativeTrapData entries is allocated from the extra
1851 // data space in the MDO. If we run out of space, the trap data for
1852 // the ProfileData at that bci is updated.
1853 class SpeculativeTrapData : public ProfileData {
1854 protected:
1855 enum {
1856 speculative_trap_method,
1857 #ifndef _LP64
1858 // The size of the area for traps is a multiple of the header
1859 // size, 2 cells on 32 bits. Packed at the end of this area are
1860 // argument info entries (with tag
1861 // DataLayout::arg_info_data_tag). The logic in
1862 // MethodData::bci_to_extra_data() that guarantees traps don't
1863 // overflow over argument info entries assumes the size of a
1864 // SpeculativeTrapData is twice the header size. On 32 bits, a
1865 // SpeculativeTrapData must be 4 cells.
1866 padding,
1867 #endif
1868 speculative_trap_cell_count
1869 };
1870 public:
1871 SpeculativeTrapData(DataLayout* layout) : ProfileData(layout) {
1872 assert(layout->tag() == DataLayout::speculative_trap_data_tag, "wrong type");
1873 }
1874
1875 virtual bool is_SpeculativeTrapData() const { return true; }
1876
1877 static int static_cell_count() {
1878 return speculative_trap_cell_count;
1879 }
1880
1881 virtual int cell_count() const {
1882 return static_cell_count();
1883 }
1884
1885 // Direct accessor
1886 Method* method() const {
1887 return (Method*)intptr_at(speculative_trap_method);
1888 }
1889
1890 void set_method(Method* m) {
1891 assert(!m->is_old(), "cannot add old methods");
1892 set_intptr_at(speculative_trap_method, (intptr_t)m);
1893 }
1894
1895 static ByteSize method_offset() {
1896 return cell_offset(speculative_trap_method);
1897 }
1898
1899 // CDS support
1900 virtual void metaspace_pointers_do(MetaspaceClosure* it);
1901
1902 virtual void print_data_on(outputStream* st, const char* extra = nullptr) const;
1903 };
1904
1905 // MethodData*
1906 //
1907 // A MethodData* holds information which has been collected about
1908 // a method. Its layout looks like this:
1909 //
1910 // -----------------------------
1911 // | header |
1912 // | klass |
1913 // -----------------------------
1914 // | method |
1915 // | size of the MethodData* |
1916 // -----------------------------
1917 // | Data entries... |
1918 // | (variable size) |
1919 // | |
1920 // . .
1921 // . .
1922 // . .
1923 // | |
1924 // -----------------------------
1925 //
1926 // The data entry area is a heterogeneous array of DataLayouts. Each
1927 // DataLayout in the array corresponds to a specific bytecode in the
1928 // method. The entries in the array are sorted by the corresponding
1929 // bytecode. Access to the data is via resource-allocated ProfileData,
1930 // which point to the underlying blocks of DataLayout structures.
1931 //
1932 // During interpretation, if profiling in enabled, the interpreter
1933 // maintains a method data pointer (mdp), which points at the entry
1934 // in the array corresponding to the current bci. In the course of
1935 // interpretation, when a bytecode is encountered that has profile data
1936 // associated with it, the entry pointed to by mdp is updated, then the
1937 // mdp is adjusted to point to the next appropriate DataLayout. If mdp
1938 // is null to begin with, the interpreter assumes that the current method
1939 // is not (yet) being profiled.
1940 //
1941 // In MethodData* parlance, "dp" is a "data pointer", the actual address
1942 // of a DataLayout element. A "di" is a "data index", the offset in bytes
1943 // from the base of the data entry array. A "displacement" is the byte offset
1944 // in certain ProfileData objects that indicate the amount the mdp must be
1945 // adjusted in the event of a change in control flow.
1946 //
1947
1948 class CleanExtraDataClosure : public StackObj {
1949 public:
1950 virtual bool is_live(Method* m) = 0;
1951 };
1952
1953
1954 #if INCLUDE_JVMCI
1955 // Encapsulates an encoded speculation reason. These are linked together in
1956 // a list that is atomically appended to during deoptimization. Entries are
1957 // never removed from the list.
1958 // @see jdk.vm.ci.hotspot.HotSpotSpeculationLog.HotSpotSpeculationEncoding
1959 class FailedSpeculation: public CHeapObj<mtCompiler> {
1960 private:
1961 // The length of HotSpotSpeculationEncoding.toByteArray(). The data itself
1962 // is an array embedded at the end of this object.
1963 int _data_len;
1964
1965 // Next entry in a linked list.
1966 FailedSpeculation* _next;
1967
1968 FailedSpeculation(address data, int data_len);
1969
1970 FailedSpeculation** next_adr() { return &_next; }
1971
1972 // Placement new operator for inlining the speculation data into
1973 // the FailedSpeculation object.
1974 void* operator new(size_t size, size_t fs_size) throw();
1975
1976 public:
1977 char* data() { return (char*)(((address) this) + sizeof(FailedSpeculation)); }
1978 int data_len() const { return _data_len; }
1979 FailedSpeculation* next() const { return _next; }
1980
1981 // Atomically appends a speculation from nm to the list whose head is at (*failed_speculations_address).
1982 // Returns false if the FailedSpeculation object could not be allocated.
1983 static bool add_failed_speculation(nmethod* nm, FailedSpeculation** failed_speculations_address, address speculation, int speculation_len);
1984
1985 // Frees all entries in the linked list whose head is at (*failed_speculations_address).
1986 static void free_failed_speculations(FailedSpeculation** failed_speculations_address);
1987 };
1988 #endif
1989
1990 class ciMethodData;
1991
1992 class MethodData : public Metadata {
1993 friend class VMStructs;
1994 friend class JVMCIVMStructs;
1995 friend class ProfileData;
1996 friend class TypeEntriesAtCall;
1997 friend class ciMethodData;
1998 friend class VM_ReinitializeMDO;
1999
2000 // If you add a new field that points to any metaspace object, you
2001 // must add this field to MethodData::metaspace_pointers_do().
2002
2003 // Back pointer to the Method*
2004 Method* _method;
2005
2006 // Size of this oop in bytes
2007 int _size;
2008
2009 // Cached hint for bci_to_dp and bci_to_data
2010 int _hint_di;
2011
2012 Mutex* volatile _extra_data_lock; // FIXME: CDS support
2013
2014 MethodData(const methodHandle& method);
2015
2016 void initialize();
2017
2018 public:
2019 MethodData();
2020
2021 static MethodData* allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS);
2022
2023 virtual bool is_methodData() const { return true; }
2024
2025 // Safely reinitialize the data in the MDO. This is intended as a testing facility as the
2026 // reinitialization is performed at a safepoint so it's isn't cheap and it doesn't ensure that all
2027 // readers will see consistent profile data.
2028 void reinitialize();
2029
2030 // Whole-method sticky bits and flags
2031 enum {
2032 _trap_hist_limit = Deoptimization::Reason_TRAP_HISTORY_LENGTH,
2033 _trap_hist_mask = max_jubyte,
2034 _extra_data_count = 4 // extra DataLayout headers, for trap history
2035 }; // Public flag values
2036
2037 // Compiler-related counters.
2038 class CompilerCounters {
2039 friend class VMStructs;
2040 friend class JVMCIVMStructs;
2041
2042 uint _nof_decompiles; // count of all nmethod removals
2043 uint _nof_overflow_recompiles; // recompile count, excluding recomp. bits
2044 uint _nof_overflow_traps; // trap count, excluding _trap_hist
2045 uint __gap;
2046 union {
2047 intptr_t _align;
2048 // JVMCI separates trap history for OSR compilations from normal compilations
2049 u1 _array[JVMCI_ONLY(2 *) MethodData::_trap_hist_limit];
2050 } _trap_hist;
2051
2052 public:
2053 CompilerCounters() : _nof_decompiles(0), _nof_overflow_recompiles(0), _nof_overflow_traps(0), __gap(0) {
2054 #ifndef ZERO
2055 // Some Zero platforms do not have expected alignment, and do not use
2056 // this code. static_assert would still fire and fail for them.
2057 static_assert(sizeof(_trap_hist) % HeapWordSize == 0, "align");
2058 #endif
2059 uint size_in_words = sizeof(_trap_hist) / HeapWordSize;
2060 Copy::zero_to_words((HeapWord*) &_trap_hist, size_in_words);
2061 }
2062
2063 // Return (uint)-1 for overflow.
2064 uint trap_count(int reason) const {
2065 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2066 return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1;
2067 }
2068
2069 uint inc_trap_count(int reason) {
2070 // Count another trap, anywhere in this method.
2071 assert(reason >= 0, "must be single trap");
2072 assert((uint)reason < ARRAY_SIZE(_trap_hist._array), "oob");
2073 uint cnt1 = 1 + _trap_hist._array[reason];
2074 if ((cnt1 & _trap_hist_mask) != 0) { // if no counter overflow...
2075 _trap_hist._array[reason] = (u1)cnt1;
2076 return cnt1;
2077 } else {
2078 return _trap_hist_mask + (++_nof_overflow_traps);
2079 }
2080 }
2081
2082 uint overflow_trap_count() const {
2083 return _nof_overflow_traps;
2084 }
2085 uint overflow_recompile_count() const {
2086 return _nof_overflow_recompiles;
2087 }
2088 uint inc_overflow_recompile_count() {
2089 return ++_nof_overflow_recompiles;
2090 }
2091 uint decompile_count() const {
2092 return _nof_decompiles;
2093 }
2094 uint inc_decompile_count() {
2095 return ++_nof_decompiles;
2096 }
2097
2098 // Support for code generation
2099 static ByteSize trap_history_offset() {
2100 return byte_offset_of(CompilerCounters, _trap_hist._array);
2101 }
2102 };
2103
2104 private:
2105 CompilerCounters _compiler_counters;
2106
2107 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2108 intx _eflags; // flags on escape information
2109 intx _arg_local; // bit set of non-escaping arguments
2110 intx _arg_stack; // bit set of stack-allocatable arguments
2111 intx _arg_returned; // bit set of returned arguments
2112
2113 int _creation_mileage; // method mileage at MDO creation
2114
2115 // How many invocations has this MDO seen?
2116 // These counters are used to determine the exact age of MDO.
2117 // We need those because in tiered a method can be concurrently
2118 // executed at different levels.
2119 InvocationCounter _invocation_counter;
2120 // Same for backedges.
2121 InvocationCounter _backedge_counter;
2122 // Counter values at the time profiling started.
2123 int _invocation_counter_start;
2124 int _backedge_counter_start;
2125 uint _tenure_traps;
2126 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog
2127 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog
2128
2129 // Number of loops and blocks is computed when compiling the first
2130 // time with C1. It is used to determine if method is trivial.
2131 short _num_loops;
2132 short _num_blocks;
2133 // Does this method contain anything worth profiling?
2134 enum WouldProfile {unknown, no_profile, profile};
2135 WouldProfile _would_profile;
2136
2137 #if INCLUDE_JVMCI
2138 // Support for HotSpotMethodData.setCompiledIRSize(int)
2139 FailedSpeculation* _failed_speculations;
2140 int _jvmci_ir_size;
2141 #endif
2142
2143 // Size of _data array in bytes. (Excludes header and extra_data fields.)
2144 int _data_size;
2145
2146 // data index for the area dedicated to parameters. -1 if no
2147 // parameter profiling.
2148 enum { no_parameters = -2, parameters_uninitialized = -1 };
2149 int _parameters_type_data_di;
2150
2151 // data index of exception handler profiling data
2152 int _exception_handler_data_di;
2153
2154 // Beginning of the data entries
2155 // See comment in ciMethodData::load_data
2156 intptr_t _data[1];
2157
2158 // Helper for size computation
2159 static int compute_data_size(BytecodeStream* stream);
2160 static int bytecode_cell_count(Bytecodes::Code code);
2161 static bool is_speculative_trap_bytecode(Bytecodes::Code code);
2162 enum { no_profile_data = -1, variable_cell_count = -2 };
2163
2164 // Helper for initialization
2165 DataLayout* data_layout_at(int data_index) const {
2166 assert(data_index % sizeof(intptr_t) == 0, "unaligned");
2167 return (DataLayout*) (((address)_data) + data_index);
2168 }
2169
2170 static int single_exception_handler_data_cell_count() {
2171 return BitData::static_cell_count();
2172 }
2173
2174 static int single_exception_handler_data_size() {
2175 return DataLayout::compute_size_in_bytes(single_exception_handler_data_cell_count());
2176 }
2177
2178 DataLayout* exception_handler_data_at(int exception_handler_index) const {
2179 return data_layout_at(_exception_handler_data_di + (exception_handler_index * single_exception_handler_data_size()));
2180 }
2181
2182 int num_exception_handler_data() const {
2183 return exception_handlers_data_size() / single_exception_handler_data_size();
2184 }
2185
2186 // Initialize an individual data segment. Returns the size of
2187 // the segment in bytes.
2188 int initialize_data(BytecodeStream* stream, int data_index);
2189
2190 // Helper for data_at
2191 DataLayout* limit_data_position() const {
2192 return data_layout_at(_data_size);
2193 }
2194 bool out_of_bounds(int data_index) const {
2195 return data_index >= data_size();
2196 }
2197
2198 // Give each of the data entries a chance to perform specific
2199 // data initialization.
2200 void post_initialize(BytecodeStream* stream);
2201
2202 // hint accessors
2203 int hint_di() const { return _hint_di; }
2204 void set_hint_di(int di) {
2205 assert(!out_of_bounds(di), "hint_di out of bounds");
2206 _hint_di = di;
2207 }
2208
2209 DataLayout* data_layout_before(int bci) {
2210 // avoid SEGV on this edge case
2211 if (data_size() == 0)
2212 return nullptr;
2213 DataLayout* layout = data_layout_at(hint_di());
2214 if (layout->bci() <= bci)
2215 return layout;
2216 return data_layout_at(first_di());
2217 }
2218
2219 // What is the index of the first data entry?
2220 int first_di() const { return 0; }
2221
2222 ProfileData* bci_to_extra_data_find(int bci, Method* m, DataLayout*& dp);
2223 // Find or create an extra ProfileData:
2224 ProfileData* bci_to_extra_data(int bci, Method* m, bool create_if_missing);
2225
2226 // return the argument info cell
2227 ArgInfoData *arg_info();
2228
2229 enum {
2230 no_type_profile = 0,
2231 type_profile_jsr292 = 1,
2232 type_profile_all = 2
2233 };
2234
2235 static bool profile_jsr292(const methodHandle& m, int bci);
2236 static bool profile_unsafe(const methodHandle& m, int bci);
2237 static bool profile_memory_access(const methodHandle& m, int bci);
2238 static int profile_arguments_flag();
2239 static bool profile_all_arguments();
2240 static bool profile_arguments_for_invoke(const methodHandle& m, int bci);
2241 static int profile_return_flag();
2242 static bool profile_all_return();
2243 static bool profile_return_for_invoke(const methodHandle& m, int bci);
2244 static int profile_parameters_flag();
2245 static bool profile_parameters_jsr292_only();
2246 static bool profile_all_parameters();
2247
2248 void clean_extra_data_helper(DataLayout* dp, int shift, bool reset = false);
2249 void verify_extra_data_clean(CleanExtraDataClosure* cl);
2250
2251 DataLayout* exception_handler_bci_to_data_helper(int bci);
2252
2253 public:
2254 void clean_extra_data(CleanExtraDataClosure* cl);
2255
2256 static int header_size() {
2257 return sizeof(MethodData)/wordSize;
2258 }
2259
2260 // Compute the size of a MethodData* before it is created.
2261 static int compute_allocation_size_in_bytes(const methodHandle& method);
2262 static int compute_allocation_size_in_words(const methodHandle& method);
2263 static int compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps);
2264
2265 // Determine if a given bytecode can have profile information.
2266 static bool bytecode_has_profile(Bytecodes::Code code) {
2267 return bytecode_cell_count(code) != no_profile_data;
2268 }
2269
2270 // reset into original state
2271 void init();
2272
2273 // My size
2274 int size_in_bytes() const { return _size; }
2275 int size() const { return align_metadata_size(align_up(_size, BytesPerWord)/BytesPerWord); }
2276
2277 int creation_mileage() const { return _creation_mileage; }
2278 void set_creation_mileage(int x) { _creation_mileage = x; }
2279
2280 int invocation_count() {
2281 if (invocation_counter()->carry()) {
2282 return InvocationCounter::count_limit;
2283 }
2284 return invocation_counter()->count();
2285 }
2286 int backedge_count() {
2287 if (backedge_counter()->carry()) {
2288 return InvocationCounter::count_limit;
2289 }
2290 return backedge_counter()->count();
2291 }
2292
2293 int invocation_count_start() {
2294 if (invocation_counter()->carry()) {
2295 return 0;
2296 }
2297 return _invocation_counter_start;
2298 }
2299
2300 int backedge_count_start() {
2301 if (backedge_counter()->carry()) {
2302 return 0;
2303 }
2304 return _backedge_counter_start;
2305 }
2306
2307 int invocation_count_delta() { return invocation_count() - invocation_count_start(); }
2308 int backedge_count_delta() { return backedge_count() - backedge_count_start(); }
2309
2310 void reset_start_counters() {
2311 _invocation_counter_start = invocation_count();
2312 _backedge_counter_start = backedge_count();
2313 }
2314
2315 InvocationCounter* invocation_counter() { return &_invocation_counter; }
2316 InvocationCounter* backedge_counter() { return &_backedge_counter; }
2317
2318 #if INCLUDE_JVMCI
2319 FailedSpeculation** get_failed_speculations_address() {
2320 return &_failed_speculations;
2321 }
2322 #endif
2323
2324 #if INCLUDE_CDS
2325 void remove_unshareable_info();
2326 void restore_unshareable_info(TRAPS);
2327 #endif
2328
2329 void set_would_profile(bool p) { _would_profile = p ? profile : no_profile; }
2330 bool would_profile() const { return _would_profile != no_profile; }
2331
2332 int num_loops() const { return _num_loops; }
2333 void set_num_loops(short n) { _num_loops = n; }
2334 int num_blocks() const { return _num_blocks; }
2335 void set_num_blocks(short n) { _num_blocks = n; }
2336
2337 bool is_mature() const; // consult mileage and ProfileMaturityPercentage
2338 static int mileage_of(Method* m);
2339
2340 // Support for interprocedural escape analysis, from Thomas Kotzmann.
2341 enum EscapeFlag {
2342 estimated = 1 << 0,
2343 return_local = 1 << 1,
2344 return_allocated = 1 << 2,
2345 allocated_escapes = 1 << 3,
2346 unknown_modified = 1 << 4
2347 };
2348
2349 intx eflags() { return _eflags; }
2350 intx arg_local() { return _arg_local; }
2351 intx arg_stack() { return _arg_stack; }
2352 intx arg_returned() { return _arg_returned; }
2353 uint arg_modified(int a);
2354 void set_eflags(intx v) { _eflags = v; }
2355 void set_arg_local(intx v) { _arg_local = v; }
2356 void set_arg_stack(intx v) { _arg_stack = v; }
2357 void set_arg_returned(intx v) { _arg_returned = v; }
2358 void set_arg_modified(int a, uint v);
2359 void clear_escape_info() { _eflags = _arg_local = _arg_stack = _arg_returned = 0; }
2360
2361 // Location and size of data area
2362 address data_base() const {
2363 return (address) _data;
2364 }
2365 int data_size() const {
2366 return _data_size;
2367 }
2368
2369 int parameters_size_in_bytes() const {
2370 return pointer_delta_as_int((address) parameters_data_limit(), (address) parameters_data_base());
2371 }
2372
2373 int exception_handlers_data_size() const {
2374 return pointer_delta_as_int((address) exception_handler_data_limit(), (address) exception_handler_data_base());
2375 }
2376
2377 // Accessors
2378 Method* method() const { return _method; }
2379
2380 // Get the data at an arbitrary (sort of) data index.
2381 ProfileData* data_at(int data_index) const;
2382
2383 // Walk through the data in order.
2384 ProfileData* first_data() const { return data_at(first_di()); }
2385 ProfileData* next_data(ProfileData* current) const;
2386 DataLayout* next_data_layout(DataLayout* current) const;
2387 bool is_valid(ProfileData* current) const { return current != nullptr; }
2388 bool is_valid(DataLayout* current) const { return current != nullptr; }
2389
2390 // Convert a dp (data pointer) to a di (data index).
2391 int dp_to_di(address dp) const {
2392 return (int)(dp - ((address)_data));
2393 }
2394
2395 // bci to di/dp conversion.
2396 address bci_to_dp(int bci);
2397 int bci_to_di(int bci) {
2398 return dp_to_di(bci_to_dp(bci));
2399 }
2400
2401 // Get the data at an arbitrary bci, or null if there is none.
2402 ProfileData* bci_to_data(int bci);
2403
2404 // Same, but try to create an extra_data record if one is needed:
2405 ProfileData* allocate_bci_to_data(int bci, Method* m) {
2406 check_extra_data_locked();
2407
2408 ProfileData* data = nullptr;
2409 // If m not null, try to allocate a SpeculativeTrapData entry
2410 if (m == nullptr) {
2411 data = bci_to_data(bci);
2412 }
2413 if (data != nullptr) {
2414 return data;
2415 }
2416 data = bci_to_extra_data(bci, m, true);
2417 if (data != nullptr) {
2418 return data;
2419 }
2420 // If SpeculativeTrapData allocation fails try to allocate a
2421 // regular entry
2422 data = bci_to_data(bci);
2423 if (data != nullptr) {
2424 return data;
2425 }
2426 return bci_to_extra_data(bci, nullptr, true);
2427 }
2428
2429 BitData* exception_handler_bci_to_data_or_null(int bci);
2430 BitData exception_handler_bci_to_data(int bci);
2431
2432 // Add a handful of extra data records, for trap tracking.
2433 // Only valid after 'set_size' is called at the end of MethodData::initialize
2434 DataLayout* extra_data_base() const {
2435 check_extra_data_locked();
2436 return limit_data_position();
2437 }
2438 DataLayout* extra_data_limit() const { return (DataLayout*)((address)this + size_in_bytes()); }
2439 // pointers to sections in extra data
2440 DataLayout* args_data_limit() const { return parameters_data_base(); }
2441 DataLayout* parameters_data_base() const {
2442 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2443 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di) : parameters_data_limit();
2444 }
2445 DataLayout* parameters_data_limit() const {
2446 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2447 return exception_handler_data_base();
2448 }
2449 DataLayout* exception_handler_data_base() const { return data_layout_at(_exception_handler_data_di); }
2450 DataLayout* exception_handler_data_limit() const { return extra_data_limit(); }
2451
2452 int extra_data_size() const { return (int)((address)extra_data_limit() - (address)limit_data_position()); }
2453 static DataLayout* next_extra(DataLayout* dp);
2454
2455 // Return (uint)-1 for overflow.
2456 uint trap_count(int reason) const {
2457 return _compiler_counters.trap_count(reason);
2458 }
2459 // For loops:
2460 static uint trap_reason_limit() { return _trap_hist_limit; }
2461 static uint trap_count_limit() { return _trap_hist_mask; }
2462 uint inc_trap_count(int reason) {
2463 return _compiler_counters.inc_trap_count(reason);
2464 }
2465
2466 uint overflow_trap_count() const {
2467 return _compiler_counters.overflow_trap_count();
2468 }
2469 uint overflow_recompile_count() const {
2470 return _compiler_counters.overflow_recompile_count();
2471 }
2472 uint inc_overflow_recompile_count() {
2473 return _compiler_counters.inc_overflow_recompile_count();
2474 }
2475 uint decompile_count() const {
2476 return _compiler_counters.decompile_count();
2477 }
2478 uint inc_decompile_count() {
2479 uint dec_count = _compiler_counters.inc_decompile_count();
2480 if (dec_count > (uint)PerMethodRecompilationCutoff) {
2481 method()->set_not_compilable("decompile_count > PerMethodRecompilationCutoff", CompLevel_full_optimization);
2482 }
2483 return dec_count;
2484 }
2485 uint tenure_traps() const {
2486 return _tenure_traps;
2487 }
2488 void inc_tenure_traps() {
2489 _tenure_traps += 1;
2490 }
2491
2492 // Return pointer to area dedicated to parameters in MDO
2493 ParametersTypeData* parameters_type_data() const {
2494 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2495 return _parameters_type_data_di != no_parameters ? data_layout_at(_parameters_type_data_di)->data_in()->as_ParametersTypeData() : nullptr;
2496 }
2497
2498 int parameters_type_data_di() const {
2499 assert(_parameters_type_data_di != parameters_uninitialized, "called too early");
2500 return _parameters_type_data_di != no_parameters ? _parameters_type_data_di : exception_handlers_data_di();
2501 }
2502
2503 int exception_handlers_data_di() const {
2504 return _exception_handler_data_di;
2505 }
2506
2507 // Support for code generation
2508 static ByteSize data_offset() {
2509 return byte_offset_of(MethodData, _data[0]);
2510 }
2511
2512 static ByteSize trap_history_offset() {
2513 return byte_offset_of(MethodData, _compiler_counters) + CompilerCounters::trap_history_offset();
2514 }
2515
2516 static ByteSize invocation_counter_offset() {
2517 return byte_offset_of(MethodData, _invocation_counter);
2518 }
2519
2520 static ByteSize backedge_counter_offset() {
2521 return byte_offset_of(MethodData, _backedge_counter);
2522 }
2523
2524 static ByteSize invoke_mask_offset() {
2525 return byte_offset_of(MethodData, _invoke_mask);
2526 }
2527
2528 static ByteSize backedge_mask_offset() {
2529 return byte_offset_of(MethodData, _backedge_mask);
2530 }
2531
2532 static ByteSize parameters_type_data_di_offset() {
2533 return byte_offset_of(MethodData, _parameters_type_data_di);
2534 }
2535
2536 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
2537 virtual MetaspaceObj::Type type() const { return MethodDataType; }
2538
2539 // Deallocation support
2540 void deallocate_contents(ClassLoaderData* loader_data);
2541 void release_C_heap_structures();
2542
2543 // GC support
2544 void set_size(int object_size_in_bytes) { _size = object_size_in_bytes; }
2545
2546 // Printing
2547 void print_on (outputStream* st) const;
2548 void print_value_on(outputStream* st) const;
2549
2550 // printing support for method data
2551 void print_data_on(outputStream* st) const;
2552
2553 const char* internal_name() const { return "{method data}"; }
2554
2555 // verification
2556 void verify_on(outputStream* st);
2557 void verify_data_on(outputStream* st);
2558
2559 static bool profile_parameters_for_method(const methodHandle& m);
2560 static bool profile_arguments();
2561 static bool profile_arguments_jsr292_only();
2562 static bool profile_return();
2563 static bool profile_parameters();
2564 static bool profile_return_jsr292_only();
2565
2566 void clean_method_data(bool always_clean);
2567 void clean_weak_method_links();
2568 Mutex* extra_data_lock();
2569 void check_extra_data_locked() const NOT_DEBUG_RETURN;
2570 };
2571
2572 #endif // SHARE_OOPS_METHODDATA_HPP