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annotate src/share/vm/oops/methodDataOop.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 576e77447e3c |
| children | d5d065957597 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 | |
| 941 | 58 // forward decl |
| 59 class ProfileData; | |
| 60 | |
| 0 | 61 // DataLayout |
| 62 // | |
| 63 // Overlay for generic profiling data. | |
| 64 class DataLayout VALUE_OBJ_CLASS_SPEC { | |
| 65 private: | |
| 66 // Every data layout begins with a header. This header | |
| 67 // contains a tag, which is used to indicate the size/layout | |
| 68 // of the data, 4 bits of flags, which can be used in any way, | |
| 69 // 4 bits of trap history (none/one reason/many reasons), | |
| 70 // and a bci, which is used to tie this piece of data to a | |
| 71 // specific bci in the bytecodes. | |
| 72 union { | |
| 73 intptr_t _bits; | |
| 74 struct { | |
| 75 u1 _tag; | |
| 76 u1 _flags; | |
| 77 u2 _bci; | |
| 78 } _struct; | |
| 79 } _header; | |
| 80 | |
| 81 // The data layout has an arbitrary number of cells, each sized | |
| 82 // to accomodate a pointer or an integer. | |
| 83 intptr_t _cells[1]; | |
| 84 | |
| 85 // Some types of data layouts need a length field. | |
| 86 static bool needs_array_len(u1 tag); | |
| 87 | |
| 88 public: | |
| 89 enum { | |
| 90 counter_increment = 1 | |
| 91 }; | |
| 92 | |
| 93 enum { | |
| 94 cell_size = sizeof(intptr_t) | |
| 95 }; | |
| 96 | |
| 97 // Tag values | |
| 98 enum { | |
| 99 no_tag, | |
| 100 bit_data_tag, | |
| 101 counter_data_tag, | |
| 102 jump_data_tag, | |
| 103 receiver_type_data_tag, | |
| 104 virtual_call_data_tag, | |
| 105 ret_data_tag, | |
| 106 branch_data_tag, | |
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107 multi_branch_data_tag, |
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108 arg_info_data_tag |
| 0 | 109 }; |
| 110 | |
| 111 enum { | |
| 112 // The _struct._flags word is formatted as [trap_state:4 | flags:4]. | |
| 113 // The trap state breaks down further as [recompile:1 | reason:3]. | |
| 114 // This further breakdown is defined in deoptimization.cpp. | |
| 115 // See Deoptimization::trap_state_reason for an assert that | |
| 116 // trap_bits is big enough to hold reasons < Reason_RECORDED_LIMIT. | |
| 117 // | |
| 118 // The trap_state is collected only if ProfileTraps is true. | |
| 119 trap_bits = 1+3, // 3: enough to distinguish [0..Reason_RECORDED_LIMIT]. | |
| 120 trap_shift = BitsPerByte - trap_bits, | |
| 121 trap_mask = right_n_bits(trap_bits), | |
| 122 trap_mask_in_place = (trap_mask << trap_shift), | |
| 123 flag_limit = trap_shift, | |
| 124 flag_mask = right_n_bits(flag_limit), | |
| 125 first_flag = 0 | |
| 126 }; | |
| 127 | |
| 128 // Size computation | |
| 129 static int header_size_in_bytes() { | |
| 130 return cell_size; | |
| 131 } | |
| 132 static int header_size_in_cells() { | |
| 133 return 1; | |
| 134 } | |
| 135 | |
| 136 static int compute_size_in_bytes(int cell_count) { | |
| 137 return header_size_in_bytes() + cell_count * cell_size; | |
| 138 } | |
| 139 | |
| 140 // Initialization | |
| 141 void initialize(u1 tag, u2 bci, int cell_count); | |
| 142 | |
| 143 // Accessors | |
| 144 u1 tag() { | |
| 145 return _header._struct._tag; | |
| 146 } | |
| 147 | |
| 148 // Return a few bits of trap state. Range is [0..trap_mask]. | |
| 149 // The state tells if traps with zero, one, or many reasons have occurred. | |
| 150 // It also tells whether zero or many recompilations have occurred. | |
| 151 // The associated trap histogram in the MDO itself tells whether | |
| 152 // traps are common or not. If a BCI shows that a trap X has | |
| 153 // occurred, and the MDO shows N occurrences of X, we make the | |
| 154 // simplifying assumption that all N occurrences can be blamed | |
| 155 // on that BCI. | |
| 156 int trap_state() { | |
| 157 return ((_header._struct._flags >> trap_shift) & trap_mask); | |
| 158 } | |
| 159 | |
| 160 void set_trap_state(int new_state) { | |
| 161 assert(ProfileTraps, "used only under +ProfileTraps"); | |
| 162 uint old_flags = (_header._struct._flags & flag_mask); | |
| 163 _header._struct._flags = (new_state << trap_shift) | old_flags; | |
| 164 } | |
| 165 | |
| 166 u1 flags() { | |
| 167 return _header._struct._flags; | |
| 168 } | |
| 169 | |
| 170 u2 bci() { | |
| 171 return _header._struct._bci; | |
| 172 } | |
| 173 | |
| 174 void set_header(intptr_t value) { | |
| 175 _header._bits = value; | |
| 176 } | |
| 177 void release_set_header(intptr_t value) { | |
| 178 OrderAccess::release_store_ptr(&_header._bits, value); | |
| 179 } | |
| 180 intptr_t header() { | |
| 181 return _header._bits; | |
| 182 } | |
| 183 void set_cell_at(int index, intptr_t value) { | |
| 184 _cells[index] = value; | |
| 185 } | |
| 186 void release_set_cell_at(int index, intptr_t value) { | |
| 187 OrderAccess::release_store_ptr(&_cells[index], value); | |
| 188 } | |
| 189 intptr_t cell_at(int index) { | |
| 190 return _cells[index]; | |
| 191 } | |
| 192 intptr_t* adr_cell_at(int index) { | |
| 193 return &_cells[index]; | |
| 194 } | |
| 195 oop* adr_oop_at(int index) { | |
| 196 return (oop*)&(_cells[index]); | |
| 197 } | |
| 198 | |
| 199 void set_flag_at(int flag_number) { | |
| 200 assert(flag_number < flag_limit, "oob"); | |
| 201 _header._struct._flags |= (0x1 << flag_number); | |
| 202 } | |
| 203 bool flag_at(int flag_number) { | |
| 204 assert(flag_number < flag_limit, "oob"); | |
| 205 return (_header._struct._flags & (0x1 << flag_number)) != 0; | |
| 206 } | |
| 207 | |
| 208 // Low-level support for code generation. | |
| 209 static ByteSize header_offset() { | |
| 210 return byte_offset_of(DataLayout, _header); | |
| 211 } | |
| 212 static ByteSize tag_offset() { | |
| 213 return byte_offset_of(DataLayout, _header._struct._tag); | |
| 214 } | |
| 215 static ByteSize flags_offset() { | |
| 216 return byte_offset_of(DataLayout, _header._struct._flags); | |
| 217 } | |
| 218 static ByteSize bci_offset() { | |
| 219 return byte_offset_of(DataLayout, _header._struct._bci); | |
| 220 } | |
| 221 static ByteSize cell_offset(int index) { | |
| 222 return byte_offset_of(DataLayout, _cells[index]); | |
| 223 } | |
| 224 // Return a value which, when or-ed as a byte into _flags, sets the flag. | |
| 225 static int flag_number_to_byte_constant(int flag_number) { | |
| 226 assert(0 <= flag_number && flag_number < flag_limit, "oob"); | |
| 227 DataLayout temp; temp.set_header(0); | |
| 228 temp.set_flag_at(flag_number); | |
| 229 return temp._header._struct._flags; | |
| 230 } | |
| 231 // Return a value which, when or-ed as a word into _header, sets the flag. | |
| 232 static intptr_t flag_mask_to_header_mask(int byte_constant) { | |
| 233 DataLayout temp; temp.set_header(0); | |
| 234 temp._header._struct._flags = byte_constant; | |
| 235 return temp._header._bits; | |
| 236 } | |
| 941 | 237 |
| 238 // GC support | |
| 239 ProfileData* data_in(); | |
| 240 void follow_weak_refs(BoolObjectClosure* cl); | |
| 0 | 241 }; |
| 242 | |
| 243 | |
| 244 // ProfileData class hierarchy | |
| 245 class ProfileData; | |
| 246 class BitData; | |
| 247 class CounterData; | |
| 248 class ReceiverTypeData; | |
| 249 class VirtualCallData; | |
| 250 class RetData; | |
| 251 class JumpData; | |
| 252 class BranchData; | |
| 253 class ArrayData; | |
| 254 class MultiBranchData; | |
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255 class ArgInfoData; |
| 0 | 256 |
| 257 | |
| 258 // ProfileData | |
| 259 // | |
| 260 // A ProfileData object is created to refer to a section of profiling | |
| 261 // data in a structured way. | |
| 262 class ProfileData : public ResourceObj { | |
| 263 private: | |
| 264 #ifndef PRODUCT | |
| 265 enum { | |
| 266 tab_width_one = 16, | |
| 267 tab_width_two = 36 | |
| 268 }; | |
| 269 #endif // !PRODUCT | |
| 270 | |
| 271 // This is a pointer to a section of profiling data. | |
| 272 DataLayout* _data; | |
| 273 | |
| 274 protected: | |
| 275 DataLayout* data() { return _data; } | |
| 276 | |
| 277 enum { | |
| 278 cell_size = DataLayout::cell_size | |
| 279 }; | |
| 280 | |
| 281 public: | |
| 282 // How many cells are in this? | |
| 283 virtual int cell_count() { | |
| 284 ShouldNotReachHere(); | |
| 285 return -1; | |
| 286 } | |
| 287 | |
| 288 // Return the size of this data. | |
| 289 int size_in_bytes() { | |
| 290 return DataLayout::compute_size_in_bytes(cell_count()); | |
| 291 } | |
| 292 | |
| 293 protected: | |
| 294 // Low-level accessors for underlying data | |
| 295 void set_intptr_at(int index, intptr_t value) { | |
| 296 assert(0 <= index && index < cell_count(), "oob"); | |
| 297 data()->set_cell_at(index, value); | |
| 298 } | |
| 299 void release_set_intptr_at(int index, intptr_t value) { | |
| 300 assert(0 <= index && index < cell_count(), "oob"); | |
| 301 data()->release_set_cell_at(index, value); | |
| 302 } | |
| 303 intptr_t intptr_at(int index) { | |
| 304 assert(0 <= index && index < cell_count(), "oob"); | |
| 305 return data()->cell_at(index); | |
| 306 } | |
| 307 void set_uint_at(int index, uint value) { | |
| 308 set_intptr_at(index, (intptr_t) value); | |
| 309 } | |
| 310 void release_set_uint_at(int index, uint value) { | |
| 311 release_set_intptr_at(index, (intptr_t) value); | |
| 312 } | |
| 313 uint uint_at(int index) { | |
| 314 return (uint)intptr_at(index); | |
| 315 } | |
| 316 void set_int_at(int index, int value) { | |
| 317 set_intptr_at(index, (intptr_t) value); | |
| 318 } | |
| 319 void release_set_int_at(int index, int value) { | |
| 320 release_set_intptr_at(index, (intptr_t) value); | |
| 321 } | |
| 322 int int_at(int index) { | |
| 323 return (int)intptr_at(index); | |
| 324 } | |
| 325 int int_at_unchecked(int index) { | |
| 326 return (int)data()->cell_at(index); | |
| 327 } | |
| 328 void set_oop_at(int index, oop value) { | |
| 329 set_intptr_at(index, (intptr_t) value); | |
| 330 } | |
| 331 oop oop_at(int index) { | |
| 332 return (oop)intptr_at(index); | |
| 333 } | |
| 334 oop* adr_oop_at(int index) { | |
| 335 assert(0 <= index && index < cell_count(), "oob"); | |
| 336 return data()->adr_oop_at(index); | |
| 337 } | |
| 338 | |
| 339 void set_flag_at(int flag_number) { | |
| 340 data()->set_flag_at(flag_number); | |
| 341 } | |
| 342 bool flag_at(int flag_number) { | |
| 343 return data()->flag_at(flag_number); | |
| 344 } | |
| 345 | |
| 346 // two convenient imports for use by subclasses: | |
| 347 static ByteSize cell_offset(int index) { | |
| 348 return DataLayout::cell_offset(index); | |
| 349 } | |
| 350 static int flag_number_to_byte_constant(int flag_number) { | |
| 351 return DataLayout::flag_number_to_byte_constant(flag_number); | |
| 352 } | |
| 353 | |
| 354 ProfileData(DataLayout* data) { | |
| 355 _data = data; | |
| 356 } | |
| 357 | |
| 358 public: | |
| 359 // Constructor for invalid ProfileData. | |
| 360 ProfileData(); | |
| 361 | |
| 362 u2 bci() { | |
| 363 return data()->bci(); | |
| 364 } | |
| 365 | |
| 366 address dp() { | |
| 367 return (address)_data; | |
| 368 } | |
| 369 | |
| 370 int trap_state() { | |
| 371 return data()->trap_state(); | |
| 372 } | |
| 373 void set_trap_state(int new_state) { | |
| 374 data()->set_trap_state(new_state); | |
| 375 } | |
| 376 | |
| 377 // Type checking | |
| 378 virtual bool is_BitData() { return false; } | |
| 379 virtual bool is_CounterData() { return false; } | |
| 380 virtual bool is_JumpData() { return false; } | |
| 381 virtual bool is_ReceiverTypeData(){ return false; } | |
| 382 virtual bool is_VirtualCallData() { return false; } | |
| 383 virtual bool is_RetData() { return false; } | |
| 384 virtual bool is_BranchData() { return false; } | |
| 385 virtual bool is_ArrayData() { return false; } | |
| 386 virtual bool is_MultiBranchData() { return false; } | |
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387 virtual bool is_ArgInfoData() { return false; } |
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388 |
| 0 | 389 |
| 390 BitData* as_BitData() { | |
| 391 assert(is_BitData(), "wrong type"); | |
| 392 return is_BitData() ? (BitData*) this : NULL; | |
| 393 } | |
| 394 CounterData* as_CounterData() { | |
| 395 assert(is_CounterData(), "wrong type"); | |
| 396 return is_CounterData() ? (CounterData*) this : NULL; | |
| 397 } | |
| 398 JumpData* as_JumpData() { | |
| 399 assert(is_JumpData(), "wrong type"); | |
| 400 return is_JumpData() ? (JumpData*) this : NULL; | |
| 401 } | |
| 402 ReceiverTypeData* as_ReceiverTypeData() { | |
| 403 assert(is_ReceiverTypeData(), "wrong type"); | |
| 404 return is_ReceiverTypeData() ? (ReceiverTypeData*)this : NULL; | |
| 405 } | |
| 406 VirtualCallData* as_VirtualCallData() { | |
| 407 assert(is_VirtualCallData(), "wrong type"); | |
| 408 return is_VirtualCallData() ? (VirtualCallData*)this : NULL; | |
| 409 } | |
| 410 RetData* as_RetData() { | |
| 411 assert(is_RetData(), "wrong type"); | |
| 412 return is_RetData() ? (RetData*) this : NULL; | |
| 413 } | |
| 414 BranchData* as_BranchData() { | |
| 415 assert(is_BranchData(), "wrong type"); | |
| 416 return is_BranchData() ? (BranchData*) this : NULL; | |
| 417 } | |
| 418 ArrayData* as_ArrayData() { | |
| 419 assert(is_ArrayData(), "wrong type"); | |
| 420 return is_ArrayData() ? (ArrayData*) this : NULL; | |
| 421 } | |
| 422 MultiBranchData* as_MultiBranchData() { | |
| 423 assert(is_MultiBranchData(), "wrong type"); | |
| 424 return is_MultiBranchData() ? (MultiBranchData*)this : NULL; | |
| 425 } | |
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426 ArgInfoData* as_ArgInfoData() { |
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427 assert(is_ArgInfoData(), "wrong type"); |
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428 return is_ArgInfoData() ? (ArgInfoData*)this : NULL; |
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429 } |
| 0 | 430 |
| 431 | |
| 432 // Subclass specific initialization | |
| 433 virtual void post_initialize(BytecodeStream* stream, methodDataOop mdo) {} | |
| 434 | |
| 435 // GC support | |
| 436 virtual void follow_contents() {} | |
| 437 virtual void oop_iterate(OopClosure* blk) {} | |
| 438 virtual void oop_iterate_m(OopClosure* blk, MemRegion mr) {} | |
| 439 virtual void adjust_pointers() {} | |
| 941 | 440 virtual void follow_weak_refs(BoolObjectClosure* is_alive_closure) {} |
| 0 | 441 |
| 442 #ifndef SERIALGC | |
| 443 // Parallel old support | |
| 444 virtual void follow_contents(ParCompactionManager* cm) {} | |
| 445 virtual void update_pointers() {} | |
| 446 virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr) {} | |
| 447 #endif // SERIALGC | |
| 448 | |
| 449 // CI translation: ProfileData can represent both MethodDataOop data | |
| 450 // as well as CIMethodData data. This function is provided for translating | |
| 451 // an oop in a ProfileData to the ci equivalent. Generally speaking, | |
| 452 // most ProfileData don't require any translation, so we provide the null | |
| 453 // translation here, and the required translators are in the ci subclasses. | |
| 454 virtual void translate_from(ProfileData* data) {} | |
| 455 | |
| 456 virtual void print_data_on(outputStream* st) { | |
| 457 ShouldNotReachHere(); | |
| 458 } | |
| 459 | |
| 460 #ifndef PRODUCT | |
| 461 void print_shared(outputStream* st, const char* name); | |
| 462 void tab(outputStream* st); | |
| 463 #endif | |
| 464 }; | |
| 465 | |
| 466 // BitData | |
| 467 // | |
| 468 // A BitData holds a flag or two in its header. | |
| 469 class BitData : public ProfileData { | |
| 470 protected: | |
| 471 enum { | |
| 472 // null_seen: | |
| 473 // saw a null operand (cast/aastore/instanceof) | |
| 474 null_seen_flag = DataLayout::first_flag + 0 | |
| 475 }; | |
| 476 enum { bit_cell_count = 0 }; // no additional data fields needed. | |
| 477 public: | |
| 478 BitData(DataLayout* layout) : ProfileData(layout) { | |
| 479 } | |
| 480 | |
| 481 virtual bool is_BitData() { return true; } | |
| 482 | |
| 483 static int static_cell_count() { | |
| 484 return bit_cell_count; | |
| 485 } | |
| 486 | |
| 487 virtual int cell_count() { | |
| 488 return static_cell_count(); | |
| 489 } | |
| 490 | |
| 491 // Accessor | |
| 492 | |
| 493 // The null_seen flag bit is specially known to the interpreter. | |
| 494 // Consulting it allows the compiler to avoid setting up null_check traps. | |
| 495 bool null_seen() { return flag_at(null_seen_flag); } | |
| 496 void set_null_seen() { set_flag_at(null_seen_flag); } | |
| 497 | |
| 498 | |
| 499 // Code generation support | |
| 500 static int null_seen_byte_constant() { | |
| 501 return flag_number_to_byte_constant(null_seen_flag); | |
| 502 } | |
| 503 | |
| 504 static ByteSize bit_data_size() { | |
| 505 return cell_offset(bit_cell_count); | |
| 506 } | |
| 507 | |
| 508 #ifndef PRODUCT | |
| 509 void print_data_on(outputStream* st); | |
| 510 #endif | |
| 511 }; | |
| 512 | |
| 513 // CounterData | |
| 514 // | |
| 515 // A CounterData corresponds to a simple counter. | |
| 516 class CounterData : public BitData { | |
| 517 protected: | |
| 518 enum { | |
| 519 count_off, | |
| 520 counter_cell_count | |
| 521 }; | |
| 522 public: | |
| 523 CounterData(DataLayout* layout) : BitData(layout) {} | |
| 524 | |
| 525 virtual bool is_CounterData() { return true; } | |
| 526 | |
| 527 static int static_cell_count() { | |
| 528 return counter_cell_count; | |
| 529 } | |
| 530 | |
| 531 virtual int cell_count() { | |
| 532 return static_cell_count(); | |
| 533 } | |
| 534 | |
| 535 // Direct accessor | |
| 536 uint count() { | |
| 537 return uint_at(count_off); | |
| 538 } | |
| 539 | |
| 540 // Code generation support | |
| 541 static ByteSize count_offset() { | |
| 542 return cell_offset(count_off); | |
| 543 } | |
| 544 static ByteSize counter_data_size() { | |
| 545 return cell_offset(counter_cell_count); | |
| 546 } | |
| 547 | |
|
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548 void set_count(uint count) { |
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549 set_uint_at(count_off, count); |
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550 } |
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551 |
| 0 | 552 #ifndef PRODUCT |
| 553 void print_data_on(outputStream* st); | |
| 554 #endif | |
| 555 }; | |
| 556 | |
| 557 // JumpData | |
| 558 // | |
| 559 // A JumpData is used to access profiling information for a direct | |
| 560 // branch. It is a counter, used for counting the number of branches, | |
| 561 // plus a data displacement, used for realigning the data pointer to | |
| 562 // the corresponding target bci. | |
| 563 class JumpData : public ProfileData { | |
| 564 protected: | |
| 565 enum { | |
| 566 taken_off_set, | |
| 567 displacement_off_set, | |
| 568 jump_cell_count | |
| 569 }; | |
| 570 | |
| 571 void set_displacement(int displacement) { | |
| 572 set_int_at(displacement_off_set, displacement); | |
| 573 } | |
| 574 | |
| 575 public: | |
| 576 JumpData(DataLayout* layout) : ProfileData(layout) { | |
| 577 assert(layout->tag() == DataLayout::jump_data_tag || | |
| 578 layout->tag() == DataLayout::branch_data_tag, "wrong type"); | |
| 579 } | |
| 580 | |
| 581 virtual bool is_JumpData() { return true; } | |
| 582 | |
| 583 static int static_cell_count() { | |
| 584 return jump_cell_count; | |
| 585 } | |
| 586 | |
| 587 virtual int cell_count() { | |
| 588 return static_cell_count(); | |
| 589 } | |
| 590 | |
| 591 // Direct accessor | |
| 592 uint taken() { | |
| 593 return uint_at(taken_off_set); | |
| 594 } | |
| 595 // Saturating counter | |
| 596 uint inc_taken() { | |
| 597 uint cnt = taken() + 1; | |
| 598 // Did we wrap? Will compiler screw us?? | |
| 599 if (cnt == 0) cnt--; | |
| 600 set_uint_at(taken_off_set, cnt); | |
| 601 return cnt; | |
| 602 } | |
| 603 | |
| 604 int displacement() { | |
| 605 return int_at(displacement_off_set); | |
| 606 } | |
| 607 | |
| 608 // Code generation support | |
| 609 static ByteSize taken_offset() { | |
| 610 return cell_offset(taken_off_set); | |
| 611 } | |
| 612 | |
| 613 static ByteSize displacement_offset() { | |
| 614 return cell_offset(displacement_off_set); | |
| 615 } | |
| 616 | |
| 617 // Specific initialization. | |
| 618 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
| 619 | |
| 620 #ifndef PRODUCT | |
| 621 void print_data_on(outputStream* st); | |
| 622 #endif | |
| 623 }; | |
| 624 | |
| 625 // ReceiverTypeData | |
| 626 // | |
| 627 // A ReceiverTypeData is used to access profiling information about a | |
| 628 // dynamic type check. It consists of a counter which counts the total times | |
| 629 // that the check is reached, and a series of (klassOop, count) pairs | |
| 630 // which are used to store a type profile for the receiver of the check. | |
| 631 class ReceiverTypeData : public CounterData { | |
| 632 protected: | |
| 633 enum { | |
| 634 receiver0_offset = counter_cell_count, | |
| 635 count0_offset, | |
| 636 receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset | |
| 637 }; | |
| 638 | |
| 639 public: | |
| 640 ReceiverTypeData(DataLayout* layout) : CounterData(layout) { | |
| 641 assert(layout->tag() == DataLayout::receiver_type_data_tag || | |
| 642 layout->tag() == DataLayout::virtual_call_data_tag, "wrong type"); | |
| 643 } | |
| 644 | |
| 645 virtual bool is_ReceiverTypeData() { return true; } | |
| 646 | |
| 647 static int static_cell_count() { | |
| 648 return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count; | |
| 649 } | |
| 650 | |
| 651 virtual int cell_count() { | |
| 652 return static_cell_count(); | |
| 653 } | |
| 654 | |
| 655 // Direct accessors | |
| 656 static uint row_limit() { | |
| 657 return TypeProfileWidth; | |
| 658 } | |
| 659 static int receiver_cell_index(uint row) { | |
| 660 return receiver0_offset + row * receiver_type_row_cell_count; | |
| 661 } | |
| 662 static int receiver_count_cell_index(uint row) { | |
| 663 return count0_offset + row * receiver_type_row_cell_count; | |
| 664 } | |
| 665 | |
| 666 // Get the receiver at row. The 'unchecked' version is needed by parallel old | |
| 667 // gc; it does not assert the receiver is a klass. During compaction of the | |
| 668 // perm gen, the klass may already have moved, so the is_klass() predicate | |
| 669 // would fail. The 'normal' version should be used whenever possible. | |
| 670 klassOop receiver_unchecked(uint row) { | |
| 671 assert(row < row_limit(), "oob"); | |
| 672 oop recv = oop_at(receiver_cell_index(row)); | |
| 673 return (klassOop)recv; | |
| 674 } | |
| 675 | |
| 676 klassOop receiver(uint row) { | |
| 677 klassOop recv = receiver_unchecked(row); | |
| 678 assert(recv == NULL || ((oop)recv)->is_klass(), "wrong type"); | |
| 679 return recv; | |
| 680 } | |
| 681 | |
| 941 | 682 void set_receiver(uint row, oop p) { |
| 683 assert((uint)row < row_limit(), "oob"); | |
| 684 set_oop_at(receiver_cell_index(row), p); | |
| 685 } | |
| 686 | |
| 0 | 687 uint receiver_count(uint row) { |
| 688 assert(row < row_limit(), "oob"); | |
| 689 return uint_at(receiver_count_cell_index(row)); | |
| 690 } | |
| 691 | |
| 941 | 692 void set_receiver_count(uint row, uint count) { |
| 693 assert(row < row_limit(), "oob"); | |
| 694 set_uint_at(receiver_count_cell_index(row), count); | |
| 695 } | |
| 696 | |
| 697 void clear_row(uint row) { | |
| 698 assert(row < row_limit(), "oob"); | |
|
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699 // Clear total count - indicator of polymorphic call site. |
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700 // The site may look like as monomorphic after that but |
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701 // it allow to have more accurate profiling information because |
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702 // there was execution phase change since klasses were unloaded. |
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703 // If the site is still polymorphic then MDO will be updated |
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704 // to reflect it. But it could be the case that the site becomes |
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705 // only bimorphic. Then keeping total count not 0 will be wrong. |
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706 // Even if we use monomorphic (when it is not) for compilation |
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707 // we will only have trap, deoptimization and recompile again |
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708 // with updated MDO after executing method in Interpreter. |
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709 // An additional receiver will be recorded in the cleaned row |
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710 // during next call execution. |
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711 // |
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712 // Note: our profiling logic works with empty rows in any slot. |
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713 // We do sorting a profiling info (ciCallProfile) for compilation. |
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714 // |
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715 set_count(0); |
| 941 | 716 set_receiver(row, NULL); |
| 717 set_receiver_count(row, 0); | |
| 718 } | |
| 719 | |
| 0 | 720 // Code generation support |
| 721 static ByteSize receiver_offset(uint row) { | |
| 722 return cell_offset(receiver_cell_index(row)); | |
| 723 } | |
| 724 static ByteSize receiver_count_offset(uint row) { | |
| 725 return cell_offset(receiver_count_cell_index(row)); | |
| 726 } | |
| 727 static ByteSize receiver_type_data_size() { | |
| 728 return cell_offset(static_cell_count()); | |
| 729 } | |
| 730 | |
| 731 // GC support | |
| 732 virtual void follow_contents(); | |
| 733 virtual void oop_iterate(OopClosure* blk); | |
| 734 virtual void oop_iterate_m(OopClosure* blk, MemRegion mr); | |
| 735 virtual void adjust_pointers(); | |
| 941 | 736 virtual void follow_weak_refs(BoolObjectClosure* is_alive_closure); |
| 0 | 737 |
| 738 #ifndef SERIALGC | |
| 739 // Parallel old support | |
| 740 virtual void follow_contents(ParCompactionManager* cm); | |
| 741 virtual void update_pointers(); | |
| 742 virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr); | |
| 743 #endif // SERIALGC | |
| 744 | |
| 745 oop* adr_receiver(uint row) { | |
| 746 return adr_oop_at(receiver_cell_index(row)); | |
| 747 } | |
| 748 | |
| 749 #ifndef PRODUCT | |
| 750 void print_receiver_data_on(outputStream* st); | |
| 751 void print_data_on(outputStream* st); | |
| 752 #endif | |
| 753 }; | |
| 754 | |
| 755 // VirtualCallData | |
| 756 // | |
| 757 // A VirtualCallData is used to access profiling information about a | |
| 758 // virtual call. For now, it has nothing more than a ReceiverTypeData. | |
| 759 class VirtualCallData : public ReceiverTypeData { | |
| 760 public: | |
| 761 VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) { | |
| 762 assert(layout->tag() == DataLayout::virtual_call_data_tag, "wrong type"); | |
| 763 } | |
| 764 | |
| 765 virtual bool is_VirtualCallData() { return true; } | |
| 766 | |
| 767 static int static_cell_count() { | |
| 768 // At this point we could add more profile state, e.g., for arguments. | |
| 769 // But for now it's the same size as the base record type. | |
| 770 return ReceiverTypeData::static_cell_count(); | |
| 771 } | |
| 772 | |
| 773 virtual int cell_count() { | |
| 774 return static_cell_count(); | |
| 775 } | |
| 776 | |
| 777 // Direct accessors | |
| 778 static ByteSize virtual_call_data_size() { | |
| 779 return cell_offset(static_cell_count()); | |
| 780 } | |
| 781 | |
| 782 #ifndef PRODUCT | |
| 783 void print_data_on(outputStream* st); | |
| 784 #endif | |
| 785 }; | |
| 786 | |
| 787 // RetData | |
| 788 // | |
| 789 // A RetData is used to access profiling information for a ret bytecode. | |
| 790 // It is composed of a count of the number of times that the ret has | |
| 791 // been executed, followed by a series of triples of the form | |
| 792 // (bci, count, di) which count the number of times that some bci was the | |
| 793 // target of the ret and cache a corresponding data displacement. | |
| 794 class RetData : public CounterData { | |
| 795 protected: | |
| 796 enum { | |
| 797 bci0_offset = counter_cell_count, | |
| 798 count0_offset, | |
| 799 displacement0_offset, | |
| 800 ret_row_cell_count = (displacement0_offset + 1) - bci0_offset | |
| 801 }; | |
| 802 | |
| 803 void set_bci(uint row, int bci) { | |
| 804 assert((uint)row < row_limit(), "oob"); | |
| 805 set_int_at(bci0_offset + row * ret_row_cell_count, bci); | |
| 806 } | |
| 807 void release_set_bci(uint row, int bci) { | |
| 808 assert((uint)row < row_limit(), "oob"); | |
| 809 // 'release' when setting the bci acts as a valid flag for other | |
| 810 // threads wrt bci_count and bci_displacement. | |
| 811 release_set_int_at(bci0_offset + row * ret_row_cell_count, bci); | |
| 812 } | |
| 813 void set_bci_count(uint row, uint count) { | |
| 814 assert((uint)row < row_limit(), "oob"); | |
| 815 set_uint_at(count0_offset + row * ret_row_cell_count, count); | |
| 816 } | |
| 817 void set_bci_displacement(uint row, int disp) { | |
| 818 set_int_at(displacement0_offset + row * ret_row_cell_count, disp); | |
| 819 } | |
| 820 | |
| 821 public: | |
| 822 RetData(DataLayout* layout) : CounterData(layout) { | |
| 823 assert(layout->tag() == DataLayout::ret_data_tag, "wrong type"); | |
| 824 } | |
| 825 | |
| 826 virtual bool is_RetData() { return true; } | |
| 827 | |
| 828 enum { | |
| 829 no_bci = -1 // value of bci when bci1/2 are not in use. | |
| 830 }; | |
| 831 | |
| 832 static int static_cell_count() { | |
| 833 return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count; | |
| 834 } | |
| 835 | |
| 836 virtual int cell_count() { | |
| 837 return static_cell_count(); | |
| 838 } | |
| 839 | |
| 840 static uint row_limit() { | |
| 841 return BciProfileWidth; | |
| 842 } | |
| 843 static int bci_cell_index(uint row) { | |
| 844 return bci0_offset + row * ret_row_cell_count; | |
| 845 } | |
| 846 static int bci_count_cell_index(uint row) { | |
| 847 return count0_offset + row * ret_row_cell_count; | |
| 848 } | |
| 849 static int bci_displacement_cell_index(uint row) { | |
| 850 return displacement0_offset + row * ret_row_cell_count; | |
| 851 } | |
| 852 | |
| 853 // Direct accessors | |
| 854 int bci(uint row) { | |
| 855 return int_at(bci_cell_index(row)); | |
| 856 } | |
| 857 uint bci_count(uint row) { | |
| 858 return uint_at(bci_count_cell_index(row)); | |
| 859 } | |
| 860 int bci_displacement(uint row) { | |
| 861 return int_at(bci_displacement_cell_index(row)); | |
| 862 } | |
| 863 | |
| 864 // Interpreter Runtime support | |
| 865 address fixup_ret(int return_bci, methodDataHandle mdo); | |
| 866 | |
| 867 // Code generation support | |
| 868 static ByteSize bci_offset(uint row) { | |
| 869 return cell_offset(bci_cell_index(row)); | |
| 870 } | |
| 871 static ByteSize bci_count_offset(uint row) { | |
| 872 return cell_offset(bci_count_cell_index(row)); | |
| 873 } | |
| 874 static ByteSize bci_displacement_offset(uint row) { | |
| 875 return cell_offset(bci_displacement_cell_index(row)); | |
| 876 } | |
| 877 | |
| 878 // Specific initialization. | |
| 879 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
| 880 | |
| 881 #ifndef PRODUCT | |
| 882 void print_data_on(outputStream* st); | |
| 883 #endif | |
| 884 }; | |
| 885 | |
| 886 // BranchData | |
| 887 // | |
| 888 // A BranchData is used to access profiling data for a two-way branch. | |
| 889 // It consists of taken and not_taken counts as well as a data displacement | |
| 890 // for the taken case. | |
| 891 class BranchData : public JumpData { | |
| 892 protected: | |
| 893 enum { | |
| 894 not_taken_off_set = jump_cell_count, | |
| 895 branch_cell_count | |
| 896 }; | |
| 897 | |
| 898 void set_displacement(int displacement) { | |
| 899 set_int_at(displacement_off_set, displacement); | |
| 900 } | |
| 901 | |
| 902 public: | |
| 903 BranchData(DataLayout* layout) : JumpData(layout) { | |
| 904 assert(layout->tag() == DataLayout::branch_data_tag, "wrong type"); | |
| 905 } | |
| 906 | |
| 907 virtual bool is_BranchData() { return true; } | |
| 908 | |
| 909 static int static_cell_count() { | |
| 910 return branch_cell_count; | |
| 911 } | |
| 912 | |
| 913 virtual int cell_count() { | |
| 914 return static_cell_count(); | |
| 915 } | |
| 916 | |
| 917 // Direct accessor | |
| 918 uint not_taken() { | |
| 919 return uint_at(not_taken_off_set); | |
| 920 } | |
| 921 | |
| 922 uint inc_not_taken() { | |
| 923 uint cnt = not_taken() + 1; | |
| 924 // Did we wrap? Will compiler screw us?? | |
| 925 if (cnt == 0) cnt--; | |
| 926 set_uint_at(not_taken_off_set, cnt); | |
| 927 return cnt; | |
| 928 } | |
| 929 | |
| 930 // Code generation support | |
| 931 static ByteSize not_taken_offset() { | |
| 932 return cell_offset(not_taken_off_set); | |
| 933 } | |
| 934 static ByteSize branch_data_size() { | |
| 935 return cell_offset(branch_cell_count); | |
| 936 } | |
| 937 | |
| 938 // Specific initialization. | |
| 939 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
| 940 | |
| 941 #ifndef PRODUCT | |
| 942 void print_data_on(outputStream* st); | |
| 943 #endif | |
| 944 }; | |
| 945 | |
| 946 // ArrayData | |
| 947 // | |
| 948 // A ArrayData is a base class for accessing profiling data which does | |
| 949 // not have a statically known size. It consists of an array length | |
| 950 // and an array start. | |
| 951 class ArrayData : public ProfileData { | |
| 952 protected: | |
| 953 friend class DataLayout; | |
| 954 | |
| 955 enum { | |
| 956 array_len_off_set, | |
| 957 array_start_off_set | |
| 958 }; | |
| 959 | |
| 960 uint array_uint_at(int index) { | |
| 961 int aindex = index + array_start_off_set; | |
| 962 return uint_at(aindex); | |
| 963 } | |
| 964 int array_int_at(int index) { | |
| 965 int aindex = index + array_start_off_set; | |
| 966 return int_at(aindex); | |
| 967 } | |
| 968 oop array_oop_at(int index) { | |
| 969 int aindex = index + array_start_off_set; | |
| 970 return oop_at(aindex); | |
| 971 } | |
| 972 void array_set_int_at(int index, int value) { | |
| 973 int aindex = index + array_start_off_set; | |
| 974 set_int_at(aindex, value); | |
| 975 } | |
| 976 | |
| 977 // Code generation support for subclasses. | |
| 978 static ByteSize array_element_offset(int index) { | |
| 979 return cell_offset(array_start_off_set + index); | |
| 980 } | |
| 981 | |
| 982 public: | |
| 983 ArrayData(DataLayout* layout) : ProfileData(layout) {} | |
| 984 | |
| 985 virtual bool is_ArrayData() { return true; } | |
| 986 | |
| 987 static int static_cell_count() { | |
| 988 return -1; | |
| 989 } | |
| 990 | |
| 991 int array_len() { | |
| 992 return int_at_unchecked(array_len_off_set); | |
| 993 } | |
| 994 | |
| 995 virtual int cell_count() { | |
| 996 return array_len() + 1; | |
| 997 } | |
| 998 | |
| 999 // Code generation support | |
| 1000 static ByteSize array_len_offset() { | |
| 1001 return cell_offset(array_len_off_set); | |
| 1002 } | |
| 1003 static ByteSize array_start_offset() { | |
| 1004 return cell_offset(array_start_off_set); | |
| 1005 } | |
| 1006 }; | |
| 1007 | |
| 1008 // MultiBranchData | |
| 1009 // | |
| 1010 // A MultiBranchData is used to access profiling information for | |
| 1011 // a multi-way branch (*switch bytecodes). It consists of a series | |
| 1012 // of (count, displacement) pairs, which count the number of times each | |
| 1013 // case was taken and specify the data displacment for each branch target. | |
| 1014 class MultiBranchData : public ArrayData { | |
| 1015 protected: | |
| 1016 enum { | |
| 1017 default_count_off_set, | |
| 1018 default_disaplacement_off_set, | |
| 1019 case_array_start | |
| 1020 }; | |
| 1021 enum { | |
| 1022 relative_count_off_set, | |
| 1023 relative_displacement_off_set, | |
| 1024 per_case_cell_count | |
| 1025 }; | |
| 1026 | |
| 1027 void set_default_displacement(int displacement) { | |
| 1028 array_set_int_at(default_disaplacement_off_set, displacement); | |
| 1029 } | |
| 1030 void set_displacement_at(int index, int displacement) { | |
| 1031 array_set_int_at(case_array_start + | |
| 1032 index * per_case_cell_count + | |
| 1033 relative_displacement_off_set, | |
| 1034 displacement); | |
| 1035 } | |
| 1036 | |
| 1037 public: | |
| 1038 MultiBranchData(DataLayout* layout) : ArrayData(layout) { | |
| 1039 assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type"); | |
| 1040 } | |
| 1041 | |
| 1042 virtual bool is_MultiBranchData() { return true; } | |
| 1043 | |
| 1044 static int compute_cell_count(BytecodeStream* stream); | |
| 1045 | |
| 1046 int number_of_cases() { | |
| 1047 int alen = array_len() - 2; // get rid of default case here. | |
| 1048 assert(alen % per_case_cell_count == 0, "must be even"); | |
| 1049 return (alen / per_case_cell_count); | |
| 1050 } | |
| 1051 | |
| 1052 uint default_count() { | |
| 1053 return array_uint_at(default_count_off_set); | |
| 1054 } | |
| 1055 int default_displacement() { | |
| 1056 return array_int_at(default_disaplacement_off_set); | |
| 1057 } | |
| 1058 | |
| 1059 uint count_at(int index) { | |
| 1060 return array_uint_at(case_array_start + | |
| 1061 index * per_case_cell_count + | |
| 1062 relative_count_off_set); | |
| 1063 } | |
| 1064 int displacement_at(int index) { | |
| 1065 return array_int_at(case_array_start + | |
| 1066 index * per_case_cell_count + | |
| 1067 relative_displacement_off_set); | |
| 1068 } | |
| 1069 | |
| 1070 // Code generation support | |
| 1071 static ByteSize default_count_offset() { | |
| 1072 return array_element_offset(default_count_off_set); | |
| 1073 } | |
| 1074 static ByteSize default_displacement_offset() { | |
| 1075 return array_element_offset(default_disaplacement_off_set); | |
| 1076 } | |
| 1077 static ByteSize case_count_offset(int index) { | |
| 1078 return case_array_offset() + | |
| 1079 (per_case_size() * index) + | |
| 1080 relative_count_offset(); | |
| 1081 } | |
| 1082 static ByteSize case_array_offset() { | |
| 1083 return array_element_offset(case_array_start); | |
| 1084 } | |
| 1085 static ByteSize per_case_size() { | |
| 1086 return in_ByteSize(per_case_cell_count) * cell_size; | |
| 1087 } | |
| 1088 static ByteSize relative_count_offset() { | |
| 1089 return in_ByteSize(relative_count_off_set) * cell_size; | |
| 1090 } | |
| 1091 static ByteSize relative_displacement_offset() { | |
| 1092 return in_ByteSize(relative_displacement_off_set) * cell_size; | |
| 1093 } | |
| 1094 | |
| 1095 // Specific initialization. | |
| 1096 void post_initialize(BytecodeStream* stream, methodDataOop mdo); | |
| 1097 | |
| 1098 #ifndef PRODUCT | |
| 1099 void print_data_on(outputStream* st); | |
| 1100 #endif | |
| 1101 }; | |
| 1102 | |
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1103 class ArgInfoData : public ArrayData { |
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1104 |
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1105 public: |
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1106 ArgInfoData(DataLayout* layout) : ArrayData(layout) { |
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1107 assert(layout->tag() == DataLayout::arg_info_data_tag, "wrong type"); |
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1108 } |
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1109 |
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1110 virtual bool is_ArgInfoData() { return true; } |
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1111 |
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1112 |
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1113 int number_of_args() { |
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1114 return array_len(); |
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1115 } |
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1116 |
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1117 uint arg_modified(int arg) { |
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1118 return array_uint_at(arg); |
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1119 } |
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1120 |
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1121 void set_arg_modified(int arg, uint val) { |
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1122 array_set_int_at(arg, val); |
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1123 } |
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1124 |
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1125 #ifndef PRODUCT |
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1126 void print_data_on(outputStream* st); |
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1127 #endif |
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1128 }; |
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1129 |
| 0 | 1130 // methodDataOop |
| 1131 // | |
| 1132 // A methodDataOop holds information which has been collected about | |
| 1133 // a method. Its layout looks like this: | |
| 1134 // | |
| 1135 // ----------------------------- | |
| 1136 // | header | | |
| 1137 // | klass | | |
| 1138 // ----------------------------- | |
| 1139 // | method | | |
| 1140 // | size of the methodDataOop | | |
| 1141 // ----------------------------- | |
| 1142 // | Data entries... | | |
| 1143 // | (variable size) | | |
| 1144 // | | | |
| 1145 // . . | |
| 1146 // . . | |
| 1147 // . . | |
| 1148 // | | | |
| 1149 // ----------------------------- | |
| 1150 // | |
| 1151 // The data entry area is a heterogeneous array of DataLayouts. Each | |
| 1152 // DataLayout in the array corresponds to a specific bytecode in the | |
| 1153 // method. The entries in the array are sorted by the corresponding | |
| 1154 // bytecode. Access to the data is via resource-allocated ProfileData, | |
| 1155 // which point to the underlying blocks of DataLayout structures. | |
| 1156 // | |
| 1157 // During interpretation, if profiling in enabled, the interpreter | |
| 1158 // maintains a method data pointer (mdp), which points at the entry | |
| 1159 // in the array corresponding to the current bci. In the course of | |
| 1160 // intepretation, when a bytecode is encountered that has profile data | |
| 1161 // associated with it, the entry pointed to by mdp is updated, then the | |
| 1162 // mdp is adjusted to point to the next appropriate DataLayout. If mdp | |
| 1163 // is NULL to begin with, the interpreter assumes that the current method | |
| 1164 // is not (yet) being profiled. | |
| 1165 // | |
| 1166 // In methodDataOop parlance, "dp" is a "data pointer", the actual address | |
| 1167 // of a DataLayout element. A "di" is a "data index", the offset in bytes | |
| 1168 // from the base of the data entry array. A "displacement" is the byte offset | |
| 1169 // in certain ProfileData objects that indicate the amount the mdp must be | |
| 1170 // adjusted in the event of a change in control flow. | |
| 1171 // | |
| 1172 | |
| 1173 class methodDataOopDesc : public oopDesc { | |
| 1174 friend class VMStructs; | |
| 1175 private: | |
| 1176 friend class ProfileData; | |
| 1177 | |
| 1178 // Back pointer to the methodOop | |
| 1179 methodOop _method; | |
| 1180 | |
| 1181 // Size of this oop in bytes | |
| 1182 int _size; | |
| 1183 | |
| 1184 // Cached hint for bci_to_dp and bci_to_data | |
| 1185 int _hint_di; | |
| 1186 | |
| 1187 // Whole-method sticky bits and flags | |
| 1188 public: | |
| 1189 enum { | |
| 1190 _trap_hist_limit = 16, // decoupled from Deoptimization::Reason_LIMIT | |
| 1191 _trap_hist_mask = max_jubyte, | |
| 1192 _extra_data_count = 4 // extra DataLayout headers, for trap history | |
| 1193 }; // Public flag values | |
| 1194 private: | |
| 1195 uint _nof_decompiles; // count of all nmethod removals | |
| 1196 uint _nof_overflow_recompiles; // recompile count, excluding recomp. bits | |
| 1197 uint _nof_overflow_traps; // trap count, excluding _trap_hist | |
| 1198 union { | |
| 1199 intptr_t _align; | |
| 1200 u1 _array[_trap_hist_limit]; | |
| 1201 } _trap_hist; | |
| 1202 | |
| 1203 // Support for interprocedural escape analysis, from Thomas Kotzmann. | |
| 1204 intx _eflags; // flags on escape information | |
| 1205 intx _arg_local; // bit set of non-escaping arguments | |
| 1206 intx _arg_stack; // bit set of stack-allocatable arguments | |
| 1207 intx _arg_returned; // bit set of returned arguments | |
| 1208 | |
| 1209 int _creation_mileage; // method mileage at MDO creation | |
| 1210 | |
| 1211 // Size of _data array in bytes. (Excludes header and extra_data fields.) | |
| 1212 int _data_size; | |
| 1213 | |
| 1214 // Beginning of the data entries | |
| 1215 intptr_t _data[1]; | |
| 1216 | |
| 1217 // Helper for size computation | |
| 1218 static int compute_data_size(BytecodeStream* stream); | |
| 1219 static int bytecode_cell_count(Bytecodes::Code code); | |
| 1220 enum { no_profile_data = -1, variable_cell_count = -2 }; | |
| 1221 | |
| 1222 // Helper for initialization | |
| 1223 DataLayout* data_layout_at(int data_index) { | |
| 1224 assert(data_index % sizeof(intptr_t) == 0, "unaligned"); | |
| 1225 return (DataLayout*) (((address)_data) + data_index); | |
| 1226 } | |
| 1227 | |
| 1228 // Initialize an individual data segment. Returns the size of | |
| 1229 // the segment in bytes. | |
| 1230 int initialize_data(BytecodeStream* stream, int data_index); | |
| 1231 | |
| 1232 // Helper for data_at | |
| 1233 DataLayout* limit_data_position() { | |
| 1234 return (DataLayout*)((address)data_base() + _data_size); | |
| 1235 } | |
| 1236 bool out_of_bounds(int data_index) { | |
| 1237 return data_index >= data_size(); | |
| 1238 } | |
| 1239 | |
| 1240 // Give each of the data entries a chance to perform specific | |
| 1241 // data initialization. | |
| 1242 void post_initialize(BytecodeStream* stream); | |
| 1243 | |
| 1244 // hint accessors | |
| 1245 int hint_di() const { return _hint_di; } | |
| 1246 void set_hint_di(int di) { | |
| 1247 assert(!out_of_bounds(di), "hint_di out of bounds"); | |
| 1248 _hint_di = di; | |
| 1249 } | |
| 1250 ProfileData* data_before(int bci) { | |
| 1251 // avoid SEGV on this edge case | |
| 1252 if (data_size() == 0) | |
| 1253 return NULL; | |
| 1254 int hint = hint_di(); | |
| 1255 if (data_layout_at(hint)->bci() <= bci) | |
| 1256 return data_at(hint); | |
| 1257 return first_data(); | |
| 1258 } | |
| 1259 | |
| 1260 // What is the index of the first data entry? | |
| 1261 int first_di() { return 0; } | |
| 1262 | |
| 1263 // Find or create an extra ProfileData: | |
| 1264 ProfileData* bci_to_extra_data(int bci, bool create_if_missing); | |
| 1265 | |
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1266 // return the argument info cell |
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1267 ArgInfoData *arg_info(); |
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1268 |
| 0 | 1269 public: |
| 1270 static int header_size() { | |
| 1271 return sizeof(methodDataOopDesc)/wordSize; | |
| 1272 } | |
| 1273 | |
| 1274 // Compute the size of a methodDataOop before it is created. | |
| 1275 static int compute_allocation_size_in_bytes(methodHandle method); | |
| 1276 static int compute_allocation_size_in_words(methodHandle method); | |
| 1277 static int compute_extra_data_count(int data_size, int empty_bc_count); | |
| 1278 | |
| 1279 // Determine if a given bytecode can have profile information. | |
| 1280 static bool bytecode_has_profile(Bytecodes::Code code) { | |
| 1281 return bytecode_cell_count(code) != no_profile_data; | |
| 1282 } | |
| 1283 | |
| 1284 // Perform initialization of a new methodDataOop | |
| 1285 void initialize(methodHandle method); | |
| 1286 | |
| 1287 // My size | |
| 1288 int object_size_in_bytes() { return _size; } | |
| 1289 int object_size() { | |
| 1290 return align_object_size(align_size_up(_size, BytesPerWord)/BytesPerWord); | |
| 1291 } | |
| 1292 | |
| 1293 int creation_mileage() const { return _creation_mileage; } | |
| 1294 void set_creation_mileage(int x) { _creation_mileage = x; } | |
| 1295 bool is_mature() const; // consult mileage and ProfileMaturityPercentage | |
| 1296 static int mileage_of(methodOop m); | |
| 1297 | |
| 1298 // Support for interprocedural escape analysis, from Thomas Kotzmann. | |
| 1299 enum EscapeFlag { | |
| 1300 estimated = 1 << 0, | |
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1301 return_local = 1 << 1, |
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1302 return_allocated = 1 << 2, |
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1303 allocated_escapes = 1 << 3, |
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1304 unknown_modified = 1 << 4 |
| 0 | 1305 }; |
| 1306 | |
| 1307 intx eflags() { return _eflags; } | |
| 1308 intx arg_local() { return _arg_local; } | |
| 1309 intx arg_stack() { return _arg_stack; } | |
| 1310 intx arg_returned() { return _arg_returned; } | |
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1311 uint arg_modified(int a) { ArgInfoData *aid = arg_info(); |
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1312 assert(a >= 0 && a < aid->number_of_args(), "valid argument number"); |
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1313 return aid->arg_modified(a); } |
| 0 | 1314 |
| 1315 void set_eflags(intx v) { _eflags = v; } | |
| 1316 void set_arg_local(intx v) { _arg_local = v; } | |
| 1317 void set_arg_stack(intx v) { _arg_stack = v; } | |
| 1318 void set_arg_returned(intx v) { _arg_returned = v; } | |
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1319 void set_arg_modified(int a, uint v) { ArgInfoData *aid = arg_info(); |
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1320 assert(a >= 0 && a < aid->number_of_args(), "valid argument number"); |
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1321 |
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1322 aid->set_arg_modified(a, v); } |
| 0 | 1323 |
| 1324 void clear_escape_info() { _eflags = _arg_local = _arg_stack = _arg_returned = 0; } | |
| 1325 | |
| 1326 // Location and size of data area | |
| 1327 address data_base() const { | |
| 1328 return (address) _data; | |
| 1329 } | |
| 1330 int data_size() { | |
| 1331 return _data_size; | |
| 1332 } | |
| 1333 | |
| 1334 // Accessors | |
| 1335 methodOop method() { return _method; } | |
| 1336 | |
| 1337 // Get the data at an arbitrary (sort of) data index. | |
| 1338 ProfileData* data_at(int data_index); | |
| 1339 | |
| 1340 // Walk through the data in order. | |
| 1341 ProfileData* first_data() { return data_at(first_di()); } | |
| 1342 ProfileData* next_data(ProfileData* current); | |
| 1343 bool is_valid(ProfileData* current) { return current != NULL; } | |
| 1344 | |
| 1345 // Convert a dp (data pointer) to a di (data index). | |
| 1346 int dp_to_di(address dp) { | |
| 1347 return dp - ((address)_data); | |
| 1348 } | |
| 1349 | |
| 1350 address di_to_dp(int di) { | |
| 1351 return (address)data_layout_at(di); | |
| 1352 } | |
| 1353 | |
| 1354 // bci to di/dp conversion. | |
| 1355 address bci_to_dp(int bci); | |
| 1356 int bci_to_di(int bci) { | |
| 1357 return dp_to_di(bci_to_dp(bci)); | |
| 1358 } | |
| 1359 | |
| 1360 // Get the data at an arbitrary bci, or NULL if there is none. | |
| 1361 ProfileData* bci_to_data(int bci); | |
| 1362 | |
| 1363 // Same, but try to create an extra_data record if one is needed: | |
| 1364 ProfileData* allocate_bci_to_data(int bci) { | |
| 1365 ProfileData* data = bci_to_data(bci); | |
| 1366 return (data != NULL) ? data : bci_to_extra_data(bci, true); | |
| 1367 } | |
| 1368 | |
| 1369 // Add a handful of extra data records, for trap tracking. | |
| 1370 DataLayout* extra_data_base() { return limit_data_position(); } | |
| 1371 DataLayout* extra_data_limit() { return (DataLayout*)((address)this + object_size_in_bytes()); } | |
| 1372 int extra_data_size() { return (address)extra_data_limit() | |
| 1373 - (address)extra_data_base(); } | |
| 1374 static DataLayout* next_extra(DataLayout* dp) { return (DataLayout*)((address)dp + in_bytes(DataLayout::cell_offset(0))); } | |
| 1375 | |
| 1376 // Return (uint)-1 for overflow. | |
| 1377 uint trap_count(int reason) const { | |
| 1378 assert((uint)reason < _trap_hist_limit, "oob"); | |
| 1379 return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1; | |
| 1380 } | |
| 1381 // For loops: | |
| 1382 static uint trap_reason_limit() { return _trap_hist_limit; } | |
| 1383 static uint trap_count_limit() { return _trap_hist_mask; } | |
| 1384 uint inc_trap_count(int reason) { | |
| 1385 // Count another trap, anywhere in this method. | |
| 1386 assert(reason >= 0, "must be single trap"); | |
| 1387 if ((uint)reason < _trap_hist_limit) { | |
| 1388 uint cnt1 = 1 + _trap_hist._array[reason]; | |
| 1389 if ((cnt1 & _trap_hist_mask) != 0) { // if no counter overflow... | |
| 1390 _trap_hist._array[reason] = cnt1; | |
| 1391 return cnt1; | |
| 1392 } else { | |
| 1393 return _trap_hist_mask + (++_nof_overflow_traps); | |
| 1394 } | |
| 1395 } else { | |
| 1396 // Could not represent the count in the histogram. | |
| 1397 return (++_nof_overflow_traps); | |
| 1398 } | |
| 1399 } | |
| 1400 | |
| 1401 uint overflow_trap_count() const { | |
| 1402 return _nof_overflow_traps; | |
| 1403 } | |
| 1404 uint overflow_recompile_count() const { | |
| 1405 return _nof_overflow_recompiles; | |
| 1406 } | |
| 1407 void inc_overflow_recompile_count() { | |
| 1408 _nof_overflow_recompiles += 1; | |
| 1409 } | |
| 1410 uint decompile_count() const { | |
| 1411 return _nof_decompiles; | |
| 1412 } | |
| 1413 void inc_decompile_count() { | |
| 1414 _nof_decompiles += 1; | |
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1415 if (decompile_count() > (uint)PerMethodRecompilationCutoff) { |
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1416 method()->set_not_compilable(); |
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87684f1a88b5
6614597: Performance variability in jvm2008 xml.validation
kvn
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1417 } |
| 0 | 1418 } |
| 1419 | |
| 1420 // Support for code generation | |
| 1421 static ByteSize data_offset() { | |
| 1422 return byte_offset_of(methodDataOopDesc, _data[0]); | |
| 1423 } | |
| 1424 | |
| 1425 // GC support | |
| 1426 oop* adr_method() const { return (oop*)&_method; } | |
| 1427 bool object_is_parsable() const { return _size != 0; } | |
| 1428 void set_object_is_parsable(int object_size_in_bytes) { _size = object_size_in_bytes; } | |
| 1429 | |
| 1430 #ifndef PRODUCT | |
| 1431 // printing support for method data | |
| 1432 void print_data_on(outputStream* st); | |
| 1433 #endif | |
| 1434 | |
| 1435 // verification | |
| 1436 void verify_data_on(outputStream* st); | |
| 1437 }; |