Mercurial > hg > truffle
annotate src/share/vm/oops/methodDataOop.hpp @ 409:218f0fd3ca88
Merge
author | acorn |
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date | Wed, 22 Oct 2008 15:07:23 -0400 |
parents | d1605aabd0a1 |
children | 8b46c4d82093 |
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0 | 1 /* |
196 | 2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class BytecodeStream; | |
26 | |
27 // The MethodData object collects counts and other profile information | |
28 // during zeroth-tier (interpretive) and first-tier execution. | |
29 // The profile is used later by compilation heuristics. Some heuristics | |
30 // enable use of aggressive (or "heroic") optimizations. An aggressive | |
31 // optimization often has a down-side, a corner case that it handles | |
32 // poorly, but which is thought to be rare. The profile provides | |
33 // evidence of this rarity for a given method or even BCI. It allows | |
34 // the compiler to back out of the optimization at places where it | |
35 // has historically been a poor choice. Other heuristics try to use | |
36 // specific information gathered about types observed at a given site. | |
37 // | |
38 // All data in the profile is approximate. It is expected to be accurate | |
39 // on the whole, but the system expects occasional inaccuraces, due to | |
40 // counter overflow, multiprocessor races during data collection, space | |
41 // limitations, missing MDO blocks, etc. Bad or missing data will degrade | |
42 // optimization quality but will not affect correctness. Also, each MDO | |
43 // is marked with its birth-date ("creation_mileage") which can be used | |
44 // to assess the quality ("maturity") of its data. | |
45 // | |
46 // Short (<32-bit) counters are designed to overflow to a known "saturated" | |
47 // state. Also, certain recorded per-BCI events are given one-bit counters | |
48 // which overflow to a saturated state which applied to all counters at | |
49 // that BCI. In other words, there is a small lattice which approximates | |
50 // the ideal of an infinite-precision counter for each event at each BCI, | |
51 // and the lattice quickly "bottoms out" in a state where all counters | |
52 // are taken to be indefinitely large. | |
53 // | |
54 // The reader will find many data races in profile gathering code, starting | |
55 // with invocation counter incrementation. None of these races harm correct | |
56 // execution of the compiled code. | |
57 | |
58 // DataLayout | |
59 // | |
60 // Overlay for generic profiling data. | |
61 class DataLayout VALUE_OBJ_CLASS_SPEC { | |
62 private: | |
63 // Every data layout begins with a header. This header | |
64 // contains a tag, which is used to indicate the size/layout | |
65 // of the data, 4 bits of flags, which can be used in any way, | |
66 // 4 bits of trap history (none/one reason/many reasons), | |
67 // and a bci, which is used to tie this piece of data to a | |
68 // specific bci in the bytecodes. | |
69 union { | |
70 intptr_t _bits; | |
71 struct { | |
72 u1 _tag; | |
73 u1 _flags; | |
74 u2 _bci; | |
75 } _struct; | |
76 } _header; | |
77 | |
78 // The data layout has an arbitrary number of cells, each sized | |
79 // to accomodate a pointer or an integer. | |
80 intptr_t _cells[1]; | |
81 | |
82 // Some types of data layouts need a length field. | |
83 static bool needs_array_len(u1 tag); | |
84 | |
85 public: | |
86 enum { | |
87 counter_increment = 1 | |
88 }; | |
89 | |
90 enum { | |
91 cell_size = sizeof(intptr_t) | |
92 }; | |
93 | |
94 // Tag values | |
95 enum { | |
96 no_tag, | |
97 bit_data_tag, | |
98 counter_data_tag, | |
99 jump_data_tag, | |
100 receiver_type_data_tag, | |
101 virtual_call_data_tag, | |
102 ret_data_tag, | |
103 branch_data_tag, | |
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104 multi_branch_data_tag, |
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105 arg_info_data_tag |
0 | 106 }; |
107 | |
108 enum { | |
109 // The _struct._flags word is formatted as [trap_state:4 | flags:4]. | |
110 // The trap state breaks down further as [recompile:1 | reason:3]. | |
111 // This further breakdown is defined in deoptimization.cpp. | |
112 // See Deoptimization::trap_state_reason for an assert that | |
113 // trap_bits is big enough to hold reasons < Reason_RECORDED_LIMIT. | |
114 // | |
115 // The trap_state is collected only if ProfileTraps is true. | |
116 trap_bits = 1+3, // 3: enough to distinguish [0..Reason_RECORDED_LIMIT]. | |
117 trap_shift = BitsPerByte - trap_bits, | |
118 trap_mask = right_n_bits(trap_bits), | |
119 trap_mask_in_place = (trap_mask << trap_shift), | |
120 flag_limit = trap_shift, | |
121 flag_mask = right_n_bits(flag_limit), | |
122 first_flag = 0 | |
123 }; | |
124 | |
125 // Size computation | |
126 static int header_size_in_bytes() { | |
127 return cell_size; | |
128 } | |
129 static int header_size_in_cells() { | |
130 return 1; | |
131 } | |
132 | |
133 static int compute_size_in_bytes(int cell_count) { | |
134 return header_size_in_bytes() + cell_count * cell_size; | |
135 } | |
136 | |
137 // Initialization | |
138 void initialize(u1 tag, u2 bci, int cell_count); | |
139 | |
140 // Accessors | |
141 u1 tag() { | |
142 return _header._struct._tag; | |
143 } | |
144 | |
145 // Return a few bits of trap state. Range is [0..trap_mask]. | |
146 // The state tells if traps with zero, one, or many reasons have occurred. | |
147 // It also tells whether zero or many recompilations have occurred. | |
148 // The associated trap histogram in the MDO itself tells whether | |
149 // traps are common or not. If a BCI shows that a trap X has | |
150 // occurred, and the MDO shows N occurrences of X, we make the | |
151 // simplifying assumption that all N occurrences can be blamed | |
152 // on that BCI. | |
153 int trap_state() { | |
154 return ((_header._struct._flags >> trap_shift) & trap_mask); | |
155 } | |
156 | |
157 void set_trap_state(int new_state) { | |
158 assert(ProfileTraps, "used only under +ProfileTraps"); | |
159 uint old_flags = (_header._struct._flags & flag_mask); | |
160 _header._struct._flags = (new_state << trap_shift) | old_flags; | |
161 } | |
162 | |
163 u1 flags() { | |
164 return _header._struct._flags; | |
165 } | |
166 | |
167 u2 bci() { | |
168 return _header._struct._bci; | |
169 } | |
170 | |
171 void set_header(intptr_t value) { | |
172 _header._bits = value; | |
173 } | |
174 void release_set_header(intptr_t value) { | |
175 OrderAccess::release_store_ptr(&_header._bits, value); | |
176 } | |
177 intptr_t header() { | |
178 return _header._bits; | |
179 } | |
180 void set_cell_at(int index, intptr_t value) { | |
181 _cells[index] = value; | |
182 } | |
183 void release_set_cell_at(int index, intptr_t value) { | |
184 OrderAccess::release_store_ptr(&_cells[index], value); | |
185 } | |
186 intptr_t cell_at(int index) { | |
187 return _cells[index]; | |
188 } | |
189 intptr_t* adr_cell_at(int index) { | |
190 return &_cells[index]; | |
191 } | |
192 oop* adr_oop_at(int index) { | |
193 return (oop*)&(_cells[index]); | |
194 } | |
195 | |
196 void set_flag_at(int flag_number) { | |
197 assert(flag_number < flag_limit, "oob"); | |
198 _header._struct._flags |= (0x1 << flag_number); | |
199 } | |
200 bool flag_at(int flag_number) { | |
201 assert(flag_number < flag_limit, "oob"); | |
202 return (_header._struct._flags & (0x1 << flag_number)) != 0; | |
203 } | |
204 | |
205 // Low-level support for code generation. | |
206 static ByteSize header_offset() { | |
207 return byte_offset_of(DataLayout, _header); | |
208 } | |
209 static ByteSize tag_offset() { | |
210 return byte_offset_of(DataLayout, _header._struct._tag); | |
211 } | |
212 static ByteSize flags_offset() { | |
213 return byte_offset_of(DataLayout, _header._struct._flags); | |
214 } | |
215 static ByteSize bci_offset() { | |
216 return byte_offset_of(DataLayout, _header._struct._bci); | |
217 } | |
218 static ByteSize cell_offset(int index) { | |
219 return byte_offset_of(DataLayout, _cells[index]); | |
220 } | |
221 // Return a value which, when or-ed as a byte into _flags, sets the flag. | |
222 static int flag_number_to_byte_constant(int flag_number) { | |
223 assert(0 <= flag_number && flag_number < flag_limit, "oob"); | |
224 DataLayout temp; temp.set_header(0); | |
225 temp.set_flag_at(flag_number); | |
226 return temp._header._struct._flags; | |
227 } | |
228 // Return a value which, when or-ed as a word into _header, sets the flag. | |
229 static intptr_t flag_mask_to_header_mask(int byte_constant) { | |
230 DataLayout temp; temp.set_header(0); | |
231 temp._header._struct._flags = byte_constant; | |
232 return temp._header._bits; | |
233 } | |
234 }; | |
235 | |
236 | |
237 // ProfileData class hierarchy | |
238 class ProfileData; | |
239 class BitData; | |
240 class CounterData; | |
241 class ReceiverTypeData; | |
242 class VirtualCallData; | |
243 class RetData; | |
244 class JumpData; | |
245 class BranchData; | |
246 class ArrayData; | |
247 class MultiBranchData; | |
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248 class ArgInfoData; |
0 | 249 |
250 | |
251 // ProfileData | |
252 // | |
253 // A ProfileData object is created to refer to a section of profiling | |
254 // data in a structured way. | |
255 class ProfileData : public ResourceObj { | |
256 private: | |
257 #ifndef PRODUCT | |
258 enum { | |
259 tab_width_one = 16, | |
260 tab_width_two = 36 | |
261 }; | |
262 #endif // !PRODUCT | |
263 | |
264 // This is a pointer to a section of profiling data. | |
265 DataLayout* _data; | |
266 | |
267 protected: | |
268 DataLayout* data() { return _data; } | |
269 | |
270 enum { | |
271 cell_size = DataLayout::cell_size | |
272 }; | |
273 | |
274 public: | |
275 // How many cells are in this? | |
276 virtual int cell_count() { | |
277 ShouldNotReachHere(); | |
278 return -1; | |
279 } | |
280 | |
281 // Return the size of this data. | |
282 int size_in_bytes() { | |
283 return DataLayout::compute_size_in_bytes(cell_count()); | |
284 } | |
285 | |
286 protected: | |
287 // Low-level accessors for underlying data | |
288 void set_intptr_at(int index, intptr_t value) { | |
289 assert(0 <= index && index < cell_count(), "oob"); | |
290 data()->set_cell_at(index, value); | |
291 } | |
292 void release_set_intptr_at(int index, intptr_t value) { | |
293 assert(0 <= index && index < cell_count(), "oob"); | |
294 data()->release_set_cell_at(index, value); | |
295 } | |
296 intptr_t intptr_at(int index) { | |
297 assert(0 <= index && index < cell_count(), "oob"); | |
298 return data()->cell_at(index); | |
299 } | |
300 void set_uint_at(int index, uint value) { | |
301 set_intptr_at(index, (intptr_t) value); | |
302 } | |
303 void release_set_uint_at(int index, uint value) { | |
304 release_set_intptr_at(index, (intptr_t) value); | |
305 } | |
306 uint uint_at(int index) { | |
307 return (uint)intptr_at(index); | |
308 } | |
309 void set_int_at(int index, int value) { | |
310 set_intptr_at(index, (intptr_t) value); | |
311 } | |
312 void release_set_int_at(int index, int value) { | |
313 release_set_intptr_at(index, (intptr_t) value); | |
314 } | |
315 int int_at(int index) { | |
316 return (int)intptr_at(index); | |
317 } | |
318 int int_at_unchecked(int index) { | |
319 return (int)data()->cell_at(index); | |
320 } | |
321 void set_oop_at(int index, oop value) { | |
322 set_intptr_at(index, (intptr_t) value); | |
323 } | |
324 oop oop_at(int index) { | |
325 return (oop)intptr_at(index); | |
326 } | |
327 oop* adr_oop_at(int index) { | |
328 assert(0 <= index && index < cell_count(), "oob"); | |
329 return data()->adr_oop_at(index); | |
330 } | |
331 | |
332 void set_flag_at(int flag_number) { | |
333 data()->set_flag_at(flag_number); | |
334 } | |
335 bool flag_at(int flag_number) { | |
336 return data()->flag_at(flag_number); | |
337 } | |
338 | |
339 // two convenient imports for use by subclasses: | |
340 static ByteSize cell_offset(int index) { | |
341 return DataLayout::cell_offset(index); | |
342 } | |
343 static int flag_number_to_byte_constant(int flag_number) { | |
344 return DataLayout::flag_number_to_byte_constant(flag_number); | |
345 } | |
346 | |
347 ProfileData(DataLayout* data) { | |
348 _data = data; | |
349 } | |
350 | |
351 public: | |
352 // Constructor for invalid ProfileData. | |
353 ProfileData(); | |
354 | |
355 u2 bci() { | |
356 return data()->bci(); | |
357 } | |
358 | |
359 address dp() { | |
360 return (address)_data; | |
361 } | |
362 | |
363 int trap_state() { | |
364 return data()->trap_state(); | |
365 } | |
366 void set_trap_state(int new_state) { | |
367 data()->set_trap_state(new_state); | |
368 } | |
369 | |
370 // Type checking | |
371 virtual bool is_BitData() { return false; } | |
372 virtual bool is_CounterData() { return false; } | |
373 virtual bool is_JumpData() { return false; } | |
374 virtual bool is_ReceiverTypeData(){ return false; } | |
375 virtual bool is_VirtualCallData() { return false; } | |
376 virtual bool is_RetData() { return false; } | |
377 virtual bool is_BranchData() { return false; } | |
378 virtual bool is_ArrayData() { return false; } | |
379 virtual bool is_MultiBranchData() { return false; } | |
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380 virtual bool is_ArgInfoData() { return false; } |
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381 |
0 | 382 |
383 BitData* as_BitData() { | |
384 assert(is_BitData(), "wrong type"); | |
385 return is_BitData() ? (BitData*) this : NULL; | |
386 } | |
387 CounterData* as_CounterData() { | |
388 assert(is_CounterData(), "wrong type"); | |
389 return is_CounterData() ? (CounterData*) this : NULL; | |
390 } | |
391 JumpData* as_JumpData() { | |
392 assert(is_JumpData(), "wrong type"); | |
393 return is_JumpData() ? (JumpData*) this : NULL; | |
394 } | |
395 ReceiverTypeData* as_ReceiverTypeData() { | |
396 assert(is_ReceiverTypeData(), "wrong type"); | |
397 return is_ReceiverTypeData() ? (ReceiverTypeData*)this : NULL; | |
398 } | |
399 VirtualCallData* as_VirtualCallData() { | |
400 assert(is_VirtualCallData(), "wrong type"); | |
401 return is_VirtualCallData() ? (VirtualCallData*)this : NULL; | |
402 } | |
403 RetData* as_RetData() { | |
404 assert(is_RetData(), "wrong type"); | |
405 return is_RetData() ? (RetData*) this : NULL; | |
406 } | |
407 BranchData* as_BranchData() { | |
408 assert(is_BranchData(), "wrong type"); | |
409 return is_BranchData() ? (BranchData*) this : NULL; | |
410 } | |
411 ArrayData* as_ArrayData() { | |
412 assert(is_ArrayData(), "wrong type"); | |
413 return is_ArrayData() ? (ArrayData*) this : NULL; | |
414 } | |
415 MultiBranchData* as_MultiBranchData() { | |
416 assert(is_MultiBranchData(), "wrong type"); | |
417 return is_MultiBranchData() ? (MultiBranchData*)this : NULL; | |
418 } | |
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419 ArgInfoData* as_ArgInfoData() { |
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420 assert(is_ArgInfoData(), "wrong type"); |
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421 return is_ArgInfoData() ? (ArgInfoData*)this : NULL; |
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422 } |
0 | 423 |
424 | |
425 // Subclass specific initialization | |
426 virtual void post_initialize(BytecodeStream* stream, methodDataOop mdo) {} | |
427 | |
428 // GC support | |
429 virtual void follow_contents() {} | |
430 virtual void oop_iterate(OopClosure* blk) {} | |
431 virtual void oop_iterate_m(OopClosure* blk, MemRegion mr) {} | |
432 virtual void adjust_pointers() {} | |
433 | |
434 #ifndef SERIALGC | |
435 // Parallel old support | |
436 virtual void follow_contents(ParCompactionManager* cm) {} | |
437 virtual void update_pointers() {} | |
438 virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr) {} | |
439 #endif // SERIALGC | |
440 | |
441 // CI translation: ProfileData can represent both MethodDataOop data | |
442 // as well as CIMethodData data. This function is provided for translating | |
443 // an oop in a ProfileData to the ci equivalent. Generally speaking, | |
444 // most ProfileData don't require any translation, so we provide the null | |
445 // translation here, and the required translators are in the ci subclasses. | |
446 virtual void translate_from(ProfileData* data) {} | |
447 | |
448 virtual void print_data_on(outputStream* st) { | |
449 ShouldNotReachHere(); | |
450 } | |
451 | |
452 #ifndef PRODUCT | |
453 void print_shared(outputStream* st, const char* name); | |
454 void tab(outputStream* st); | |
455 #endif | |
456 }; | |
457 | |
458 // BitData | |
459 // | |
460 // A BitData holds a flag or two in its header. | |
461 class BitData : public ProfileData { | |
462 protected: | |
463 enum { | |
464 // null_seen: | |
465 // saw a null operand (cast/aastore/instanceof) | |
466 null_seen_flag = DataLayout::first_flag + 0 | |
467 }; | |
468 enum { bit_cell_count = 0 }; // no additional data fields needed. | |
469 public: | |
470 BitData(DataLayout* layout) : ProfileData(layout) { | |
471 } | |
472 | |
473 virtual bool is_BitData() { return true; } | |
474 | |
475 static int static_cell_count() { | |
476 return bit_cell_count; | |
477 } | |
478 | |
479 virtual int cell_count() { | |
480 return static_cell_count(); | |
481 } | |
482 | |
483 // Accessor | |
484 | |
485 // The null_seen flag bit is specially known to the interpreter. | |
486 // Consulting it allows the compiler to avoid setting up null_check traps. | |
487 bool null_seen() { return flag_at(null_seen_flag); } | |
488 void set_null_seen() { set_flag_at(null_seen_flag); } | |
489 | |
490 | |
491 // Code generation support | |
492 static int null_seen_byte_constant() { | |
493 return flag_number_to_byte_constant(null_seen_flag); | |
494 } | |
495 | |
496 static ByteSize bit_data_size() { | |
497 return cell_offset(bit_cell_count); | |
498 } | |
499 | |
500 #ifndef PRODUCT | |
501 void print_data_on(outputStream* st); | |
502 #endif | |
503 }; | |
504 | |
505 // CounterData | |
506 // | |
507 // A CounterData corresponds to a simple counter. | |
508 class CounterData : public BitData { | |
509 protected: | |
510 enum { | |
511 count_off, | |
512 counter_cell_count | |
513 }; | |
514 public: | |
515 CounterData(DataLayout* layout) : BitData(layout) {} | |
516 | |
517 virtual bool is_CounterData() { return true; } | |
518 | |
519 static int static_cell_count() { | |
520 return counter_cell_count; | |
521 } | |
522 | |
523 virtual int cell_count() { | |
524 return static_cell_count(); | |
525 } | |
526 | |
527 // Direct accessor | |
528 uint count() { | |
529 return uint_at(count_off); | |
530 } | |
531 | |
532 // Code generation support | |
533 static ByteSize count_offset() { | |
534 return cell_offset(count_off); | |
535 } | |
536 static ByteSize counter_data_size() { | |
537 return cell_offset(counter_cell_count); | |
538 } | |
539 | |
540 #ifndef PRODUCT | |
541 void print_data_on(outputStream* st); | |
542 #endif | |
543 }; | |
544 | |
545 // JumpData | |
546 // | |
547 // A JumpData is used to access profiling information for a direct | |
548 // branch. It is a counter, used for counting the number of branches, | |
549 // plus a data displacement, used for realigning the data pointer to | |
550 // the corresponding target bci. | |
551 class JumpData : public ProfileData { | |
552 protected: | |
553 enum { | |
554 taken_off_set, | |
555 displacement_off_set, | |
556 jump_cell_count | |
557 }; | |
558 | |
559 void set_displacement(int displacement) { | |
560 set_int_at(displacement_off_set, displacement); | |
561 } | |
562 | |
563 public: | |
564 JumpData(DataLayout* layout) : ProfileData(layout) { | |
565 assert(layout->tag() == DataLayout::jump_data_tag || | |
566 layout->tag() == DataLayout::branch_data_tag, "wrong type"); | |
567 } | |
568 | |
569 virtual bool is_JumpData() { return true; } | |
570 | |
571 static int static_cell_count() { | |
572 return jump_cell_count; | |
573 } | |
574 | |
575 virtual int cell_count() { | |
576 return static_cell_count(); | |
577 } | |
578 | |
579 // Direct accessor | |
580 uint taken() { | |
581 return uint_at(taken_off_set); | |
582 } | |
583 // Saturating counter | |
584 uint inc_taken() { | |
585 uint cnt = taken() + 1; | |
586 // Did we wrap? Will compiler screw us?? | |
587 if (cnt == 0) cnt--; | |
588 set_uint_at(taken_off_set, cnt); | |
589 return cnt; | |
590 } | |
591 | |
592 int displacement() { | |
593 return int_at(displacement_off_set); | |
594 } | |
595 | |
596 // Code generation support | |
597 static ByteSize taken_offset() { | |
598 return cell_offset(taken_off_set); | |
599 } | |
600 | |
601 static ByteSize displacement_offset() { | |
602 return cell_offset(displacement_off_set); | |
603 } | |
604 | |
605 // Specific initialization. | |
606 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
607 | |
608 #ifndef PRODUCT | |
609 void print_data_on(outputStream* st); | |
610 #endif | |
611 }; | |
612 | |
613 // ReceiverTypeData | |
614 // | |
615 // A ReceiverTypeData is used to access profiling information about a | |
616 // dynamic type check. It consists of a counter which counts the total times | |
617 // that the check is reached, and a series of (klassOop, count) pairs | |
618 // which are used to store a type profile for the receiver of the check. | |
619 class ReceiverTypeData : public CounterData { | |
620 protected: | |
621 enum { | |
622 receiver0_offset = counter_cell_count, | |
623 count0_offset, | |
624 receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset | |
625 }; | |
626 | |
627 public: | |
628 ReceiverTypeData(DataLayout* layout) : CounterData(layout) { | |
629 assert(layout->tag() == DataLayout::receiver_type_data_tag || | |
630 layout->tag() == DataLayout::virtual_call_data_tag, "wrong type"); | |
631 } | |
632 | |
633 virtual bool is_ReceiverTypeData() { return true; } | |
634 | |
635 static int static_cell_count() { | |
636 return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count; | |
637 } | |
638 | |
639 virtual int cell_count() { | |
640 return static_cell_count(); | |
641 } | |
642 | |
643 // Direct accessors | |
644 static uint row_limit() { | |
645 return TypeProfileWidth; | |
646 } | |
647 static int receiver_cell_index(uint row) { | |
648 return receiver0_offset + row * receiver_type_row_cell_count; | |
649 } | |
650 static int receiver_count_cell_index(uint row) { | |
651 return count0_offset + row * receiver_type_row_cell_count; | |
652 } | |
653 | |
654 // Get the receiver at row. The 'unchecked' version is needed by parallel old | |
655 // gc; it does not assert the receiver is a klass. During compaction of the | |
656 // perm gen, the klass may already have moved, so the is_klass() predicate | |
657 // would fail. The 'normal' version should be used whenever possible. | |
658 klassOop receiver_unchecked(uint row) { | |
659 assert(row < row_limit(), "oob"); | |
660 oop recv = oop_at(receiver_cell_index(row)); | |
661 return (klassOop)recv; | |
662 } | |
663 | |
664 klassOop receiver(uint row) { | |
665 klassOop recv = receiver_unchecked(row); | |
666 assert(recv == NULL || ((oop)recv)->is_klass(), "wrong type"); | |
667 return recv; | |
668 } | |
669 | |
670 uint receiver_count(uint row) { | |
671 assert(row < row_limit(), "oob"); | |
672 return uint_at(receiver_count_cell_index(row)); | |
673 } | |
674 | |
675 // Code generation support | |
676 static ByteSize receiver_offset(uint row) { | |
677 return cell_offset(receiver_cell_index(row)); | |
678 } | |
679 static ByteSize receiver_count_offset(uint row) { | |
680 return cell_offset(receiver_count_cell_index(row)); | |
681 } | |
682 static ByteSize receiver_type_data_size() { | |
683 return cell_offset(static_cell_count()); | |
684 } | |
685 | |
686 // GC support | |
687 virtual void follow_contents(); | |
688 virtual void oop_iterate(OopClosure* blk); | |
689 virtual void oop_iterate_m(OopClosure* blk, MemRegion mr); | |
690 virtual void adjust_pointers(); | |
691 | |
692 #ifndef SERIALGC | |
693 // Parallel old support | |
694 virtual void follow_contents(ParCompactionManager* cm); | |
695 virtual void update_pointers(); | |
696 virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr); | |
697 #endif // SERIALGC | |
698 | |
699 oop* adr_receiver(uint row) { | |
700 return adr_oop_at(receiver_cell_index(row)); | |
701 } | |
702 | |
703 #ifndef PRODUCT | |
704 void print_receiver_data_on(outputStream* st); | |
705 void print_data_on(outputStream* st); | |
706 #endif | |
707 }; | |
708 | |
709 // VirtualCallData | |
710 // | |
711 // A VirtualCallData is used to access profiling information about a | |
712 // virtual call. For now, it has nothing more than a ReceiverTypeData. | |
713 class VirtualCallData : public ReceiverTypeData { | |
714 public: | |
715 VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) { | |
716 assert(layout->tag() == DataLayout::virtual_call_data_tag, "wrong type"); | |
717 } | |
718 | |
719 virtual bool is_VirtualCallData() { return true; } | |
720 | |
721 static int static_cell_count() { | |
722 // At this point we could add more profile state, e.g., for arguments. | |
723 // But for now it's the same size as the base record type. | |
724 return ReceiverTypeData::static_cell_count(); | |
725 } | |
726 | |
727 virtual int cell_count() { | |
728 return static_cell_count(); | |
729 } | |
730 | |
731 // Direct accessors | |
732 static ByteSize virtual_call_data_size() { | |
733 return cell_offset(static_cell_count()); | |
734 } | |
735 | |
736 #ifndef PRODUCT | |
737 void print_data_on(outputStream* st); | |
738 #endif | |
739 }; | |
740 | |
741 // RetData | |
742 // | |
743 // A RetData is used to access profiling information for a ret bytecode. | |
744 // It is composed of a count of the number of times that the ret has | |
745 // been executed, followed by a series of triples of the form | |
746 // (bci, count, di) which count the number of times that some bci was the | |
747 // target of the ret and cache a corresponding data displacement. | |
748 class RetData : public CounterData { | |
749 protected: | |
750 enum { | |
751 bci0_offset = counter_cell_count, | |
752 count0_offset, | |
753 displacement0_offset, | |
754 ret_row_cell_count = (displacement0_offset + 1) - bci0_offset | |
755 }; | |
756 | |
757 void set_bci(uint row, int bci) { | |
758 assert((uint)row < row_limit(), "oob"); | |
759 set_int_at(bci0_offset + row * ret_row_cell_count, bci); | |
760 } | |
761 void release_set_bci(uint row, int bci) { | |
762 assert((uint)row < row_limit(), "oob"); | |
763 // 'release' when setting the bci acts as a valid flag for other | |
764 // threads wrt bci_count and bci_displacement. | |
765 release_set_int_at(bci0_offset + row * ret_row_cell_count, bci); | |
766 } | |
767 void set_bci_count(uint row, uint count) { | |
768 assert((uint)row < row_limit(), "oob"); | |
769 set_uint_at(count0_offset + row * ret_row_cell_count, count); | |
770 } | |
771 void set_bci_displacement(uint row, int disp) { | |
772 set_int_at(displacement0_offset + row * ret_row_cell_count, disp); | |
773 } | |
774 | |
775 public: | |
776 RetData(DataLayout* layout) : CounterData(layout) { | |
777 assert(layout->tag() == DataLayout::ret_data_tag, "wrong type"); | |
778 } | |
779 | |
780 virtual bool is_RetData() { return true; } | |
781 | |
782 enum { | |
783 no_bci = -1 // value of bci when bci1/2 are not in use. | |
784 }; | |
785 | |
786 static int static_cell_count() { | |
787 return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count; | |
788 } | |
789 | |
790 virtual int cell_count() { | |
791 return static_cell_count(); | |
792 } | |
793 | |
794 static uint row_limit() { | |
795 return BciProfileWidth; | |
796 } | |
797 static int bci_cell_index(uint row) { | |
798 return bci0_offset + row * ret_row_cell_count; | |
799 } | |
800 static int bci_count_cell_index(uint row) { | |
801 return count0_offset + row * ret_row_cell_count; | |
802 } | |
803 static int bci_displacement_cell_index(uint row) { | |
804 return displacement0_offset + row * ret_row_cell_count; | |
805 } | |
806 | |
807 // Direct accessors | |
808 int bci(uint row) { | |
809 return int_at(bci_cell_index(row)); | |
810 } | |
811 uint bci_count(uint row) { | |
812 return uint_at(bci_count_cell_index(row)); | |
813 } | |
814 int bci_displacement(uint row) { | |
815 return int_at(bci_displacement_cell_index(row)); | |
816 } | |
817 | |
818 // Interpreter Runtime support | |
819 address fixup_ret(int return_bci, methodDataHandle mdo); | |
820 | |
821 // Code generation support | |
822 static ByteSize bci_offset(uint row) { | |
823 return cell_offset(bci_cell_index(row)); | |
824 } | |
825 static ByteSize bci_count_offset(uint row) { | |
826 return cell_offset(bci_count_cell_index(row)); | |
827 } | |
828 static ByteSize bci_displacement_offset(uint row) { | |
829 return cell_offset(bci_displacement_cell_index(row)); | |
830 } | |
831 | |
832 // Specific initialization. | |
833 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
834 | |
835 #ifndef PRODUCT | |
836 void print_data_on(outputStream* st); | |
837 #endif | |
838 }; | |
839 | |
840 // BranchData | |
841 // | |
842 // A BranchData is used to access profiling data for a two-way branch. | |
843 // It consists of taken and not_taken counts as well as a data displacement | |
844 // for the taken case. | |
845 class BranchData : public JumpData { | |
846 protected: | |
847 enum { | |
848 not_taken_off_set = jump_cell_count, | |
849 branch_cell_count | |
850 }; | |
851 | |
852 void set_displacement(int displacement) { | |
853 set_int_at(displacement_off_set, displacement); | |
854 } | |
855 | |
856 public: | |
857 BranchData(DataLayout* layout) : JumpData(layout) { | |
858 assert(layout->tag() == DataLayout::branch_data_tag, "wrong type"); | |
859 } | |
860 | |
861 virtual bool is_BranchData() { return true; } | |
862 | |
863 static int static_cell_count() { | |
864 return branch_cell_count; | |
865 } | |
866 | |
867 virtual int cell_count() { | |
868 return static_cell_count(); | |
869 } | |
870 | |
871 // Direct accessor | |
872 uint not_taken() { | |
873 return uint_at(not_taken_off_set); | |
874 } | |
875 | |
876 uint inc_not_taken() { | |
877 uint cnt = not_taken() + 1; | |
878 // Did we wrap? Will compiler screw us?? | |
879 if (cnt == 0) cnt--; | |
880 set_uint_at(not_taken_off_set, cnt); | |
881 return cnt; | |
882 } | |
883 | |
884 // Code generation support | |
885 static ByteSize not_taken_offset() { | |
886 return cell_offset(not_taken_off_set); | |
887 } | |
888 static ByteSize branch_data_size() { | |
889 return cell_offset(branch_cell_count); | |
890 } | |
891 | |
892 // Specific initialization. | |
893 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
894 | |
895 #ifndef PRODUCT | |
896 void print_data_on(outputStream* st); | |
897 #endif | |
898 }; | |
899 | |
900 // ArrayData | |
901 // | |
902 // A ArrayData is a base class for accessing profiling data which does | |
903 // not have a statically known size. It consists of an array length | |
904 // and an array start. | |
905 class ArrayData : public ProfileData { | |
906 protected: | |
907 friend class DataLayout; | |
908 | |
909 enum { | |
910 array_len_off_set, | |
911 array_start_off_set | |
912 }; | |
913 | |
914 uint array_uint_at(int index) { | |
915 int aindex = index + array_start_off_set; | |
916 return uint_at(aindex); | |
917 } | |
918 int array_int_at(int index) { | |
919 int aindex = index + array_start_off_set; | |
920 return int_at(aindex); | |
921 } | |
922 oop array_oop_at(int index) { | |
923 int aindex = index + array_start_off_set; | |
924 return oop_at(aindex); | |
925 } | |
926 void array_set_int_at(int index, int value) { | |
927 int aindex = index + array_start_off_set; | |
928 set_int_at(aindex, value); | |
929 } | |
930 | |
931 // Code generation support for subclasses. | |
932 static ByteSize array_element_offset(int index) { | |
933 return cell_offset(array_start_off_set + index); | |
934 } | |
935 | |
936 public: | |
937 ArrayData(DataLayout* layout) : ProfileData(layout) {} | |
938 | |
939 virtual bool is_ArrayData() { return true; } | |
940 | |
941 static int static_cell_count() { | |
942 return -1; | |
943 } | |
944 | |
945 int array_len() { | |
946 return int_at_unchecked(array_len_off_set); | |
947 } | |
948 | |
949 virtual int cell_count() { | |
950 return array_len() + 1; | |
951 } | |
952 | |
953 // Code generation support | |
954 static ByteSize array_len_offset() { | |
955 return cell_offset(array_len_off_set); | |
956 } | |
957 static ByteSize array_start_offset() { | |
958 return cell_offset(array_start_off_set); | |
959 } | |
960 }; | |
961 | |
962 // MultiBranchData | |
963 // | |
964 // A MultiBranchData is used to access profiling information for | |
965 // a multi-way branch (*switch bytecodes). It consists of a series | |
966 // of (count, displacement) pairs, which count the number of times each | |
967 // case was taken and specify the data displacment for each branch target. | |
968 class MultiBranchData : public ArrayData { | |
969 protected: | |
970 enum { | |
971 default_count_off_set, | |
972 default_disaplacement_off_set, | |
973 case_array_start | |
974 }; | |
975 enum { | |
976 relative_count_off_set, | |
977 relative_displacement_off_set, | |
978 per_case_cell_count | |
979 }; | |
980 | |
981 void set_default_displacement(int displacement) { | |
982 array_set_int_at(default_disaplacement_off_set, displacement); | |
983 } | |
984 void set_displacement_at(int index, int displacement) { | |
985 array_set_int_at(case_array_start + | |
986 index * per_case_cell_count + | |
987 relative_displacement_off_set, | |
988 displacement); | |
989 } | |
990 | |
991 public: | |
992 MultiBranchData(DataLayout* layout) : ArrayData(layout) { | |
993 assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type"); | |
994 } | |
995 | |
996 virtual bool is_MultiBranchData() { return true; } | |
997 | |
998 static int compute_cell_count(BytecodeStream* stream); | |
999 | |
1000 int number_of_cases() { | |
1001 int alen = array_len() - 2; // get rid of default case here. | |
1002 assert(alen % per_case_cell_count == 0, "must be even"); | |
1003 return (alen / per_case_cell_count); | |
1004 } | |
1005 | |
1006 uint default_count() { | |
1007 return array_uint_at(default_count_off_set); | |
1008 } | |
1009 int default_displacement() { | |
1010 return array_int_at(default_disaplacement_off_set); | |
1011 } | |
1012 | |
1013 uint count_at(int index) { | |
1014 return array_uint_at(case_array_start + | |
1015 index * per_case_cell_count + | |
1016 relative_count_off_set); | |
1017 } | |
1018 int displacement_at(int index) { | |
1019 return array_int_at(case_array_start + | |
1020 index * per_case_cell_count + | |
1021 relative_displacement_off_set); | |
1022 } | |
1023 | |
1024 // Code generation support | |
1025 static ByteSize default_count_offset() { | |
1026 return array_element_offset(default_count_off_set); | |
1027 } | |
1028 static ByteSize default_displacement_offset() { | |
1029 return array_element_offset(default_disaplacement_off_set); | |
1030 } | |
1031 static ByteSize case_count_offset(int index) { | |
1032 return case_array_offset() + | |
1033 (per_case_size() * index) + | |
1034 relative_count_offset(); | |
1035 } | |
1036 static ByteSize case_array_offset() { | |
1037 return array_element_offset(case_array_start); | |
1038 } | |
1039 static ByteSize per_case_size() { | |
1040 return in_ByteSize(per_case_cell_count) * cell_size; | |
1041 } | |
1042 static ByteSize relative_count_offset() { | |
1043 return in_ByteSize(relative_count_off_set) * cell_size; | |
1044 } | |
1045 static ByteSize relative_displacement_offset() { | |
1046 return in_ByteSize(relative_displacement_off_set) * cell_size; | |
1047 } | |
1048 | |
1049 // Specific initialization. | |
1050 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
1051 | |
1052 #ifndef PRODUCT | |
1053 void print_data_on(outputStream* st); | |
1054 #endif | |
1055 }; | |
1056 | |
45
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1057 class ArgInfoData : public ArrayData { |
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1058 |
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1059 public: |
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1060 ArgInfoData(DataLayout* layout) : ArrayData(layout) { |
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1061 assert(layout->tag() == DataLayout::arg_info_data_tag, "wrong type"); |
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1062 } |
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1063 |
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1064 virtual bool is_ArgInfoData() { return true; } |
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1065 |
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1066 |
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1067 int number_of_args() { |
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1068 return array_len(); |
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1069 } |
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1070 |
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1071 uint arg_modified(int arg) { |
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1072 return array_uint_at(arg); |
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1073 } |
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1074 |
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1075 void set_arg_modified(int arg, uint val) { |
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1076 array_set_int_at(arg, val); |
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1077 } |
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1078 |
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1079 #ifndef PRODUCT |
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1080 void print_data_on(outputStream* st); |
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1081 #endif |
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1082 }; |
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1083 |
0 | 1084 // methodDataOop |
1085 // | |
1086 // A methodDataOop holds information which has been collected about | |
1087 // a method. Its layout looks like this: | |
1088 // | |
1089 // ----------------------------- | |
1090 // | header | | |
1091 // | klass | | |
1092 // ----------------------------- | |
1093 // | method | | |
1094 // | size of the methodDataOop | | |
1095 // ----------------------------- | |
1096 // | Data entries... | | |
1097 // | (variable size) | | |
1098 // | | | |
1099 // . . | |
1100 // . . | |
1101 // . . | |
1102 // | | | |
1103 // ----------------------------- | |
1104 // | |
1105 // The data entry area is a heterogeneous array of DataLayouts. Each | |
1106 // DataLayout in the array corresponds to a specific bytecode in the | |
1107 // method. The entries in the array are sorted by the corresponding | |
1108 // bytecode. Access to the data is via resource-allocated ProfileData, | |
1109 // which point to the underlying blocks of DataLayout structures. | |
1110 // | |
1111 // During interpretation, if profiling in enabled, the interpreter | |
1112 // maintains a method data pointer (mdp), which points at the entry | |
1113 // in the array corresponding to the current bci. In the course of | |
1114 // intepretation, when a bytecode is encountered that has profile data | |
1115 // associated with it, the entry pointed to by mdp is updated, then the | |
1116 // mdp is adjusted to point to the next appropriate DataLayout. If mdp | |
1117 // is NULL to begin with, the interpreter assumes that the current method | |
1118 // is not (yet) being profiled. | |
1119 // | |
1120 // In methodDataOop parlance, "dp" is a "data pointer", the actual address | |
1121 // of a DataLayout element. A "di" is a "data index", the offset in bytes | |
1122 // from the base of the data entry array. A "displacement" is the byte offset | |
1123 // in certain ProfileData objects that indicate the amount the mdp must be | |
1124 // adjusted in the event of a change in control flow. | |
1125 // | |
1126 | |
1127 class methodDataOopDesc : public oopDesc { | |
1128 friend class VMStructs; | |
1129 private: | |
1130 friend class ProfileData; | |
1131 | |
1132 // Back pointer to the methodOop | |
1133 methodOop _method; | |
1134 | |
1135 // Size of this oop in bytes | |
1136 int _size; | |
1137 | |
1138 // Cached hint for bci_to_dp and bci_to_data | |
1139 int _hint_di; | |
1140 | |
1141 // Whole-method sticky bits and flags | |
1142 public: | |
1143 enum { | |
1144 _trap_hist_limit = 16, // decoupled from Deoptimization::Reason_LIMIT | |
1145 _trap_hist_mask = max_jubyte, | |
1146 _extra_data_count = 4 // extra DataLayout headers, for trap history | |
1147 }; // Public flag values | |
1148 private: | |
1149 uint _nof_decompiles; // count of all nmethod removals | |
1150 uint _nof_overflow_recompiles; // recompile count, excluding recomp. bits | |
1151 uint _nof_overflow_traps; // trap count, excluding _trap_hist | |
1152 union { | |
1153 intptr_t _align; | |
1154 u1 _array[_trap_hist_limit]; | |
1155 } _trap_hist; | |
1156 | |
1157 // Support for interprocedural escape analysis, from Thomas Kotzmann. | |
1158 intx _eflags; // flags on escape information | |
1159 intx _arg_local; // bit set of non-escaping arguments | |
1160 intx _arg_stack; // bit set of stack-allocatable arguments | |
1161 intx _arg_returned; // bit set of returned arguments | |
1162 | |
1163 int _creation_mileage; // method mileage at MDO creation | |
1164 | |
1165 // Size of _data array in bytes. (Excludes header and extra_data fields.) | |
1166 int _data_size; | |
1167 | |
1168 // Beginning of the data entries | |
1169 intptr_t _data[1]; | |
1170 | |
1171 // Helper for size computation | |
1172 static int compute_data_size(BytecodeStream* stream); | |
1173 static int bytecode_cell_count(Bytecodes::Code code); | |
1174 enum { no_profile_data = -1, variable_cell_count = -2 }; | |
1175 | |
1176 // Helper for initialization | |
1177 DataLayout* data_layout_at(int data_index) { | |
1178 assert(data_index % sizeof(intptr_t) == 0, "unaligned"); | |
1179 return (DataLayout*) (((address)_data) + data_index); | |
1180 } | |
1181 | |
1182 // Initialize an individual data segment. Returns the size of | |
1183 // the segment in bytes. | |
1184 int initialize_data(BytecodeStream* stream, int data_index); | |
1185 | |
1186 // Helper for data_at | |
1187 DataLayout* limit_data_position() { | |
1188 return (DataLayout*)((address)data_base() + _data_size); | |
1189 } | |
1190 bool out_of_bounds(int data_index) { | |
1191 return data_index >= data_size(); | |
1192 } | |
1193 | |
1194 // Give each of the data entries a chance to perform specific | |
1195 // data initialization. | |
1196 void post_initialize(BytecodeStream* stream); | |
1197 | |
1198 // hint accessors | |
1199 int hint_di() const { return _hint_di; } | |
1200 void set_hint_di(int di) { | |
1201 assert(!out_of_bounds(di), "hint_di out of bounds"); | |
1202 _hint_di = di; | |
1203 } | |
1204 ProfileData* data_before(int bci) { | |
1205 // avoid SEGV on this edge case | |
1206 if (data_size() == 0) | |
1207 return NULL; | |
1208 int hint = hint_di(); | |
1209 if (data_layout_at(hint)->bci() <= bci) | |
1210 return data_at(hint); | |
1211 return first_data(); | |
1212 } | |
1213 | |
1214 // What is the index of the first data entry? | |
1215 int first_di() { return 0; } | |
1216 | |
1217 // Find or create an extra ProfileData: | |
1218 ProfileData* bci_to_extra_data(int bci, bool create_if_missing); | |
1219 | |
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1220 // return the argument info cell |
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1221 ArgInfoData *arg_info(); |
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1222 |
0 | 1223 public: |
1224 static int header_size() { | |
1225 return sizeof(methodDataOopDesc)/wordSize; | |
1226 } | |
1227 | |
1228 // Compute the size of a methodDataOop before it is created. | |
1229 static int compute_allocation_size_in_bytes(methodHandle method); | |
1230 static int compute_allocation_size_in_words(methodHandle method); | |
1231 static int compute_extra_data_count(int data_size, int empty_bc_count); | |
1232 | |
1233 // Determine if a given bytecode can have profile information. | |
1234 static bool bytecode_has_profile(Bytecodes::Code code) { | |
1235 return bytecode_cell_count(code) != no_profile_data; | |
1236 } | |
1237 | |
1238 // Perform initialization of a new methodDataOop | |
1239 void initialize(methodHandle method); | |
1240 | |
1241 // My size | |
1242 int object_size_in_bytes() { return _size; } | |
1243 int object_size() { | |
1244 return align_object_size(align_size_up(_size, BytesPerWord)/BytesPerWord); | |
1245 } | |
1246 | |
1247 int creation_mileage() const { return _creation_mileage; } | |
1248 void set_creation_mileage(int x) { _creation_mileage = x; } | |
1249 bool is_mature() const; // consult mileage and ProfileMaturityPercentage | |
1250 static int mileage_of(methodOop m); | |
1251 | |
1252 // Support for interprocedural escape analysis, from Thomas Kotzmann. | |
1253 enum EscapeFlag { | |
1254 estimated = 1 << 0, | |
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1255 return_local = 1 << 1, |
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1256 return_allocated = 1 << 2, |
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1257 allocated_escapes = 1 << 3, |
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1258 unknown_modified = 1 << 4 |
0 | 1259 }; |
1260 | |
1261 intx eflags() { return _eflags; } | |
1262 intx arg_local() { return _arg_local; } | |
1263 intx arg_stack() { return _arg_stack; } | |
1264 intx arg_returned() { return _arg_returned; } | |
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1265 uint arg_modified(int a) { ArgInfoData *aid = arg_info(); |
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1266 assert(a >= 0 && a < aid->number_of_args(), "valid argument number"); |
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1267 return aid->arg_modified(a); } |
0 | 1268 |
1269 void set_eflags(intx v) { _eflags = v; } | |
1270 void set_arg_local(intx v) { _arg_local = v; } | |
1271 void set_arg_stack(intx v) { _arg_stack = v; } | |
1272 void set_arg_returned(intx v) { _arg_returned = v; } | |
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1273 void set_arg_modified(int a, uint v) { ArgInfoData *aid = arg_info(); |
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1274 assert(a >= 0 && a < aid->number_of_args(), "valid argument number"); |
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1275 |
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1276 aid->set_arg_modified(a, v); } |
0 | 1277 |
1278 void clear_escape_info() { _eflags = _arg_local = _arg_stack = _arg_returned = 0; } | |
1279 | |
1280 // Location and size of data area | |
1281 address data_base() const { | |
1282 return (address) _data; | |
1283 } | |
1284 int data_size() { | |
1285 return _data_size; | |
1286 } | |
1287 | |
1288 // Accessors | |
1289 methodOop method() { return _method; } | |
1290 | |
1291 // Get the data at an arbitrary (sort of) data index. | |
1292 ProfileData* data_at(int data_index); | |
1293 | |
1294 // Walk through the data in order. | |
1295 ProfileData* first_data() { return data_at(first_di()); } | |
1296 ProfileData* next_data(ProfileData* current); | |
1297 bool is_valid(ProfileData* current) { return current != NULL; } | |
1298 | |
1299 // Convert a dp (data pointer) to a di (data index). | |
1300 int dp_to_di(address dp) { | |
1301 return dp - ((address)_data); | |
1302 } | |
1303 | |
1304 address di_to_dp(int di) { | |
1305 return (address)data_layout_at(di); | |
1306 } | |
1307 | |
1308 // bci to di/dp conversion. | |
1309 address bci_to_dp(int bci); | |
1310 int bci_to_di(int bci) { | |
1311 return dp_to_di(bci_to_dp(bci)); | |
1312 } | |
1313 | |
1314 // Get the data at an arbitrary bci, or NULL if there is none. | |
1315 ProfileData* bci_to_data(int bci); | |
1316 | |
1317 // Same, but try to create an extra_data record if one is needed: | |
1318 ProfileData* allocate_bci_to_data(int bci) { | |
1319 ProfileData* data = bci_to_data(bci); | |
1320 return (data != NULL) ? data : bci_to_extra_data(bci, true); | |
1321 } | |
1322 | |
1323 // Add a handful of extra data records, for trap tracking. | |
1324 DataLayout* extra_data_base() { return limit_data_position(); } | |
1325 DataLayout* extra_data_limit() { return (DataLayout*)((address)this + object_size_in_bytes()); } | |
1326 int extra_data_size() { return (address)extra_data_limit() | |
1327 - (address)extra_data_base(); } | |
1328 static DataLayout* next_extra(DataLayout* dp) { return (DataLayout*)((address)dp + in_bytes(DataLayout::cell_offset(0))); } | |
1329 | |
1330 // Return (uint)-1 for overflow. | |
1331 uint trap_count(int reason) const { | |
1332 assert((uint)reason < _trap_hist_limit, "oob"); | |
1333 return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1; | |
1334 } | |
1335 // For loops: | |
1336 static uint trap_reason_limit() { return _trap_hist_limit; } | |
1337 static uint trap_count_limit() { return _trap_hist_mask; } | |
1338 uint inc_trap_count(int reason) { | |
1339 // Count another trap, anywhere in this method. | |
1340 assert(reason >= 0, "must be single trap"); | |
1341 if ((uint)reason < _trap_hist_limit) { | |
1342 uint cnt1 = 1 + _trap_hist._array[reason]; | |
1343 if ((cnt1 & _trap_hist_mask) != 0) { // if no counter overflow... | |
1344 _trap_hist._array[reason] = cnt1; | |
1345 return cnt1; | |
1346 } else { | |
1347 return _trap_hist_mask + (++_nof_overflow_traps); | |
1348 } | |
1349 } else { | |
1350 // Could not represent the count in the histogram. | |
1351 return (++_nof_overflow_traps); | |
1352 } | |
1353 } | |
1354 | |
1355 uint overflow_trap_count() const { | |
1356 return _nof_overflow_traps; | |
1357 } | |
1358 uint overflow_recompile_count() const { | |
1359 return _nof_overflow_recompiles; | |
1360 } | |
1361 void inc_overflow_recompile_count() { | |
1362 _nof_overflow_recompiles += 1; | |
1363 } | |
1364 uint decompile_count() const { | |
1365 return _nof_decompiles; | |
1366 } | |
1367 void inc_decompile_count() { | |
1368 _nof_decompiles += 1; | |
1369 } | |
1370 | |
1371 // Support for code generation | |
1372 static ByteSize data_offset() { | |
1373 return byte_offset_of(methodDataOopDesc, _data[0]); | |
1374 } | |
1375 | |
1376 // GC support | |
1377 oop* adr_method() const { return (oop*)&_method; } | |
1378 bool object_is_parsable() const { return _size != 0; } | |
1379 void set_object_is_parsable(int object_size_in_bytes) { _size = object_size_in_bytes; } | |
1380 | |
1381 #ifndef PRODUCT | |
1382 // printing support for method data | |
1383 void print_data_on(outputStream* st); | |
1384 #endif | |
1385 | |
1386 // verification | |
1387 void verify_data_on(outputStream* st); | |
1388 }; |