Mercurial > hg > CbC > CbC_gcc
annotate gcc/alloc-pool.h @ 136:4627f235cf2a
fix c-next example
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 08 Nov 2018 14:11:56 +0900 |
| parents | 84e7813d76e9 |
| children | 1830386684a0 |
| rev | line source |
|---|---|
| 0 | 1 /* Functions to support a pool of allocatable objects |
| 131 | 2 Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| 0 | 3 Contributed by Daniel Berlin <dan@cgsoftware.com> |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 3, or (at your option) | |
| 10 any later version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 #ifndef ALLOC_POOL_H | |
| 21 #define ALLOC_POOL_H | |
| 22 | |
| 111 | 23 #include "memory-block.h" |
| 24 #include "options.h" // for flag_checking | |
| 25 | |
| 26 extern void dump_alloc_pool_statistics (void); | |
| 27 | |
| 28 /* Flag indicates whether memory statistics are gathered any longer. */ | |
| 29 extern bool after_memory_report; | |
| 30 | |
| 0 | 31 typedef unsigned long ALLOC_POOL_ID_TYPE; |
| 32 | |
| 111 | 33 /* Last used ID. */ |
| 34 extern ALLOC_POOL_ID_TYPE last_id; | |
| 35 | |
| 36 /* Pool allocator memory usage. */ | |
| 37 struct pool_usage: public mem_usage | |
| 0 | 38 { |
| 111 | 39 /* Default contructor. */ |
| 40 pool_usage (): m_element_size (0), m_pool_name ("") {} | |
| 41 /* Constructor. */ | |
| 42 pool_usage (size_t allocated, size_t times, size_t peak, | |
| 43 size_t instances, size_t element_size, | |
| 44 const char *pool_name) | |
| 45 : mem_usage (allocated, times, peak, instances), | |
| 46 m_element_size (element_size), | |
| 47 m_pool_name (pool_name) {} | |
| 48 | |
| 49 /* Sum the usage with SECOND usage. */ | |
| 50 pool_usage | |
| 51 operator+ (const pool_usage &second) | |
| 52 { | |
| 53 return pool_usage (m_allocated + second.m_allocated, | |
| 54 m_times + second.m_times, | |
| 55 m_peak + second.m_peak, | |
| 56 m_instances + second.m_instances, | |
| 57 m_element_size, m_pool_name); | |
| 58 } | |
| 59 | |
| 60 /* Dump usage coupled to LOC location, where TOTAL is sum of all rows. */ | |
| 61 inline void | |
| 62 dump (mem_location *loc, mem_usage &total) const | |
| 63 { | |
| 64 char *location_string = loc->to_string (); | |
| 65 | |
| 66 fprintf (stderr, "%-32s%-48s %6li%10li:%5.1f%%%10li%10li:%5.1f%%%12li\n", | |
| 67 m_pool_name, location_string, (long)m_instances, | |
| 68 (long)m_allocated, get_percent (m_allocated, total.m_allocated), | |
| 69 (long)m_peak, (long)m_times, | |
| 70 get_percent (m_times, total.m_times), | |
| 71 (long)m_element_size); | |
| 72 | |
| 73 free (location_string); | |
| 74 } | |
| 0 | 75 |
| 111 | 76 /* Dump header with NAME. */ |
| 77 static inline void | |
| 78 dump_header (const char *name) | |
| 79 { | |
| 80 fprintf (stderr, "%-32s%-48s %6s%11s%16s%17s%12s\n", "Pool name", name, | |
| 81 "Pools", "Leak", "Peak", "Times", "Elt size"); | |
| 82 print_dash_line (); | |
| 83 } | |
| 84 | |
| 85 /* Dump footer. */ | |
| 86 inline void | |
| 87 dump_footer () | |
| 88 { | |
| 89 print_dash_line (); | |
| 90 fprintf (stderr, "%s%82li%10li\n", "Total", (long)m_instances, | |
| 91 (long)m_allocated); | |
| 92 print_dash_line (); | |
| 93 } | |
| 94 | |
| 95 /* Element size. */ | |
| 96 size_t m_element_size; | |
| 97 /* Pool name. */ | |
| 98 const char *m_pool_name; | |
| 99 }; | |
| 100 | |
| 101 extern mem_alloc_description<pool_usage> pool_allocator_usage; | |
| 102 | |
| 103 #if 0 | |
| 104 /* If a pool with custom block size is needed, one might use the following | |
| 105 template. An instance of this template can be used as a parameter for | |
| 106 instantiating base_pool_allocator template: | |
| 107 | |
| 108 typedef custom_block_allocator <128*1024> huge_block_allocator; | |
| 109 ... | |
| 110 static base_pool_allocator <huge_block_allocator> | |
| 111 value_pool ("value", 16384); | |
| 112 | |
| 113 Right now it's not used anywhere in the code, and is given here as an | |
| 114 example). */ | |
| 115 | |
| 116 template <size_t BlockSize> | |
| 117 class custom_block_allocator | |
| 0 | 118 { |
| 111 | 119 public: |
| 120 static const size_t block_size = BlockSize; | |
| 121 | |
| 122 static inline void * | |
| 123 allocate () ATTRIBUTE_MALLOC | |
| 124 { | |
| 125 return XNEWVEC (char, BlockSize); | |
| 126 } | |
| 127 | |
| 128 static inline void | |
| 129 release (void *block) | |
| 130 { | |
| 131 XDELETEVEC (block); | |
| 132 } | |
| 133 }; | |
| 0 | 134 #endif |
| 111 | 135 |
| 136 /* Generic pool allocator. */ | |
| 137 | |
| 138 template <typename TBlockAllocator> | |
| 139 class base_pool_allocator | |
| 140 { | |
| 141 public: | |
| 142 /* Default constructor for pool allocator called NAME. */ | |
| 143 base_pool_allocator (const char *name, size_t size CXX_MEM_STAT_INFO); | |
| 144 ~base_pool_allocator (); | |
| 145 void release (); | |
| 146 void release_if_empty (); | |
| 147 void *allocate () ATTRIBUTE_MALLOC; | |
| 148 void remove (void *object); | |
| 149 size_t num_elts_current (); | |
| 150 | |
| 151 private: | |
| 152 struct allocation_pool_list | |
| 153 { | |
| 154 allocation_pool_list *next; | |
| 155 }; | |
| 156 | |
| 157 /* Initialize a pool allocator. */ | |
| 158 void initialize (); | |
| 159 | |
| 160 struct allocation_object | |
| 161 { | |
| 162 #if CHECKING_P | |
| 163 /* The ID of alloc pool which the object was allocated from. */ | |
| 164 ALLOC_POOL_ID_TYPE id; | |
| 165 #endif | |
| 166 | |
| 167 union | |
| 168 { | |
| 169 /* The data of the object. */ | |
| 170 char data[1]; | |
| 0 | 171 |
| 111 | 172 /* Because we want any type of data to be well aligned after the ID, |
| 173 the following elements are here. They are never accessed so | |
| 174 the allocated object may be even smaller than this structure. | |
| 175 We do not care about alignment for floating-point types. */ | |
| 176 char *align_p; | |
| 177 int64_t align_i; | |
| 178 } u; | |
| 179 | |
| 180 #if CHECKING_P | |
| 181 static inline allocation_object* | |
| 182 get_instance (void *data_ptr) | |
| 183 { | |
| 184 return (allocation_object *)(((char *)(data_ptr)) | |
| 185 - offsetof (allocation_object, | |
| 186 u.data)); | |
| 187 } | |
| 188 #endif | |
| 189 | |
| 190 static inline void* | |
| 191 get_data (void *instance_ptr) | |
| 192 { | |
| 193 return (void*)(((allocation_object *) instance_ptr)->u.data); | |
| 194 } | |
| 195 }; | |
| 196 | |
| 197 /* Align X to 8. */ | |
| 198 static inline size_t | |
| 199 align_eight (size_t x) | |
| 200 { | |
| 201 return (((x+7) >> 3) << 3); | |
| 202 } | |
| 203 | |
| 204 const char *m_name; | |
| 205 ALLOC_POOL_ID_TYPE m_id; | |
| 206 size_t m_elts_per_block; | |
| 207 | |
| 208 /* These are the elements that have been allocated at least once | |
| 209 and freed. */ | |
| 210 allocation_pool_list *m_returned_free_list; | |
| 0 | 211 |
| 212 /* These are the elements that have not yet been allocated out of | |
| 213 the last block obtained from XNEWVEC. */ | |
| 111 | 214 char* m_virgin_free_list; |
| 0 | 215 |
| 216 /* The number of elements in the virgin_free_list that can be | |
|
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77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
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217 allocated before needing another block. */ |
| 111 | 218 size_t m_virgin_elts_remaining; |
| 219 /* The number of elements that are allocated. */ | |
| 220 size_t m_elts_allocated; | |
| 221 /* The number of elements that are released. */ | |
| 222 size_t m_elts_free; | |
| 223 /* The number of allocated blocks. */ | |
| 224 size_t m_blocks_allocated; | |
| 225 /* List of blocks that are used to allocate new objects. */ | |
| 226 allocation_pool_list *m_block_list; | |
| 227 /* Size of a pool elements in bytes. */ | |
| 228 size_t m_elt_size; | |
| 229 /* Size in bytes that should be allocated for each element. */ | |
| 230 size_t m_size; | |
| 231 /* Flag if a pool allocator is initialized. */ | |
| 232 bool m_initialized; | |
| 233 /* Memory allocation location. */ | |
| 234 mem_location m_location; | |
| 235 }; | |
| 236 | |
| 237 template <typename TBlockAllocator> | |
| 238 inline | |
| 239 base_pool_allocator <TBlockAllocator>::base_pool_allocator ( | |
| 240 const char *name, size_t size MEM_STAT_DECL): | |
| 241 m_name (name), m_id (0), m_elts_per_block (0), m_returned_free_list (NULL), | |
| 242 m_virgin_free_list (NULL), m_virgin_elts_remaining (0), m_elts_allocated (0), | |
| 243 m_elts_free (0), m_blocks_allocated (0), m_block_list (NULL), m_elt_size (0), | |
| 244 m_size (size), m_initialized (false), | |
| 245 m_location (ALLOC_POOL_ORIGIN, false PASS_MEM_STAT) {} | |
| 246 | |
| 247 /* Initialize a pool allocator. */ | |
| 248 | |
| 249 template <typename TBlockAllocator> | |
| 250 inline void | |
| 251 base_pool_allocator <TBlockAllocator>::initialize () | |
| 252 { | |
| 253 gcc_checking_assert (!m_initialized); | |
| 254 m_initialized = true; | |
| 255 | |
| 256 size_t size = m_size; | |
| 257 | |
| 258 gcc_checking_assert (m_name); | |
| 259 | |
| 260 /* Make size large enough to store the list header. */ | |
| 261 if (size < sizeof (allocation_pool_list*)) | |
| 262 size = sizeof (allocation_pool_list*); | |
| 263 | |
| 264 /* Now align the size to a multiple of 8. */ | |
| 265 size = align_eight (size); | |
| 266 | |
| 267 /* Add the aligned size of ID. */ | |
| 268 size += offsetof (allocation_object, u.data); | |
| 269 | |
| 270 m_elt_size = size; | |
| 271 | |
| 272 if (GATHER_STATISTICS) | |
| 273 { | |
| 274 pool_usage *u = pool_allocator_usage.register_descriptor | |
| 275 (this, new mem_location (m_location)); | |
| 0 | 276 |
| 111 | 277 u->m_element_size = m_elt_size; |
| 278 u->m_pool_name = m_name; | |
| 279 } | |
| 280 | |
| 281 /* List header size should be a multiple of 8. */ | |
| 282 size_t header_size = align_eight (sizeof (allocation_pool_list)); | |
| 283 | |
| 284 m_elts_per_block = (TBlockAllocator::block_size - header_size) / size; | |
| 285 gcc_checking_assert (m_elts_per_block != 0); | |
| 286 | |
| 287 /* Increase the last used ID and use it for this pool. | |
| 288 ID == 0 is used for free elements of pool so skip it. */ | |
| 289 last_id++; | |
| 290 if (last_id == 0) | |
| 291 last_id++; | |
| 292 | |
| 293 m_id = last_id; | |
| 294 } | |
| 295 | |
| 296 /* Free all memory allocated for the given memory pool. */ | |
| 297 template <typename TBlockAllocator> | |
| 298 inline void | |
| 299 base_pool_allocator <TBlockAllocator>::release () | |
| 300 { | |
| 301 if (!m_initialized) | |
| 302 return; | |
| 303 | |
| 304 allocation_pool_list *block, *next_block; | |
| 305 | |
| 306 /* Free each block allocated to the pool. */ | |
| 307 for (block = m_block_list; block != NULL; block = next_block) | |
| 308 { | |
| 309 next_block = block->next; | |
| 310 TBlockAllocator::release (block); | |
| 311 } | |
| 312 | |
| 313 if (GATHER_STATISTICS && !after_memory_report) | |
| 314 { | |
| 315 pool_allocator_usage.release_instance_overhead | |
| 316 (this, (m_elts_allocated - m_elts_free) * m_elt_size); | |
| 317 } | |
| 318 | |
| 319 m_returned_free_list = NULL; | |
| 320 m_virgin_free_list = NULL; | |
| 321 m_virgin_elts_remaining = 0; | |
| 322 m_elts_allocated = 0; | |
| 323 m_elts_free = 0; | |
| 324 m_blocks_allocated = 0; | |
| 325 m_block_list = NULL; | |
| 326 } | |
| 327 | |
| 328 template <typename TBlockAllocator> | |
| 329 inline void | |
| 330 base_pool_allocator <TBlockAllocator>::release_if_empty () | |
| 331 { | |
| 332 if (m_elts_free == m_elts_allocated) | |
| 333 release (); | |
| 334 } | |
| 335 | |
| 336 template <typename TBlockAllocator> | |
| 337 inline base_pool_allocator <TBlockAllocator>::~base_pool_allocator () | |
| 338 { | |
| 339 release (); | |
| 0 | 340 } |
| 111 | 341 |
| 342 /* Allocates one element from the pool specified. */ | |
| 343 template <typename TBlockAllocator> | |
| 344 inline void* | |
| 345 base_pool_allocator <TBlockAllocator>::allocate () | |
| 346 { | |
| 347 if (!m_initialized) | |
| 348 initialize (); | |
| 349 | |
| 350 allocation_pool_list *header; | |
| 351 #ifdef ENABLE_VALGRIND_ANNOTATIONS | |
| 352 int size; | |
| 353 #endif | |
| 354 | |
| 355 if (GATHER_STATISTICS) | |
| 356 { | |
| 357 pool_allocator_usage.register_instance_overhead (m_elt_size, this); | |
| 358 } | |
| 359 | |
| 360 #ifdef ENABLE_VALGRIND_ANNOTATIONS | |
| 361 size = m_elt_size - offsetof (allocation_object, u.data); | |
| 362 #endif | |
| 363 | |
| 364 /* If there are no more free elements, make some more!. */ | |
| 365 if (!m_returned_free_list) | |
| 366 { | |
| 367 char *block; | |
| 368 if (!m_virgin_elts_remaining) | |
| 369 { | |
| 370 allocation_pool_list *block_header; | |
| 371 | |
| 372 /* Make the block. */ | |
| 373 block = reinterpret_cast<char *> (TBlockAllocator::allocate ()); | |
| 374 block_header = new (block) allocation_pool_list; | |
| 375 block += align_eight (sizeof (allocation_pool_list)); | |
| 376 | |
| 377 /* Throw it on the block list. */ | |
| 378 block_header->next = m_block_list; | |
| 379 m_block_list = block_header; | |
| 380 | |
| 381 /* Make the block available for allocation. */ | |
| 382 m_virgin_free_list = block; | |
| 383 m_virgin_elts_remaining = m_elts_per_block; | |
| 384 | |
| 385 /* Also update the number of elements we have free/allocated, and | |
| 386 increment the allocated block count. */ | |
| 387 m_elts_allocated += m_elts_per_block; | |
| 388 m_elts_free += m_elts_per_block; | |
| 389 m_blocks_allocated += 1; | |
| 390 } | |
| 391 | |
| 392 /* We now know that we can take the first elt off the virgin list and | |
| 393 put it on the returned list. */ | |
| 394 block = m_virgin_free_list; | |
| 395 header = (allocation_pool_list*) allocation_object::get_data (block); | |
| 396 header->next = NULL; | |
| 397 | |
| 398 /* Mark the element to be free. */ | |
| 399 #if CHECKING_P | |
| 400 ((allocation_object*) block)->id = 0; | |
| 401 #endif | |
| 402 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS (header,size)); | |
| 403 m_returned_free_list = header; | |
| 404 m_virgin_free_list += m_elt_size; | |
| 405 m_virgin_elts_remaining--; | |
| 406 | |
| 407 } | |
| 408 | |
| 409 /* Pull the first free element from the free list, and return it. */ | |
| 410 header = m_returned_free_list; | |
| 411 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_DEFINED (header, sizeof (*header))); | |
| 412 m_returned_free_list = header->next; | |
| 413 m_elts_free--; | |
| 414 | |
| 415 /* Set the ID for element. */ | |
| 416 #if CHECKING_P | |
| 417 allocation_object::get_instance (header)->id = m_id; | |
| 418 #endif | |
| 419 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (header, size)); | |
| 420 | |
| 421 return (void *)(header); | |
| 422 } | |
| 423 | |
| 424 /* Puts PTR back on POOL's free list. */ | |
| 425 template <typename TBlockAllocator> | |
| 426 inline void | |
| 427 base_pool_allocator <TBlockAllocator>::remove (void *object) | |
| 428 { | |
| 429 int size = m_elt_size - offsetof (allocation_object, u.data); | |
| 430 | |
| 431 if (flag_checking) | |
| 432 { | |
| 433 gcc_assert (m_initialized); | |
| 434 gcc_assert (object | |
| 435 /* Check if we free more than we allocated. */ | |
| 436 && m_elts_free < m_elts_allocated); | |
| 437 #if CHECKING_P | |
| 438 /* Check whether the PTR was allocated from POOL. */ | |
| 439 gcc_assert (m_id == allocation_object::get_instance (object)->id); | |
| 440 #endif | |
| 441 | |
| 442 memset (object, 0xaf, size); | |
| 443 } | |
| 444 | |
| 445 #if CHECKING_P | |
| 446 /* Mark the element to be free. */ | |
| 447 allocation_object::get_instance (object)->id = 0; | |
| 448 #endif | |
| 0 | 449 |
| 111 | 450 allocation_pool_list *header = new (object) allocation_pool_list; |
| 451 header->next = m_returned_free_list; | |
| 452 m_returned_free_list = header; | |
| 453 VALGRIND_DISCARD (VALGRIND_MAKE_MEM_NOACCESS (object, size)); | |
| 454 m_elts_free++; | |
| 455 | |
| 456 if (GATHER_STATISTICS) | |
| 457 { | |
| 458 pool_allocator_usage.release_instance_overhead (this, m_elt_size); | |
| 459 } | |
| 460 } | |
| 461 | |
| 462 /* Number of elements currently active (not returned to pool). Used for cheap | |
| 463 consistency checks. */ | |
| 464 template <typename TBlockAllocator> | |
| 465 inline size_t | |
| 466 base_pool_allocator <TBlockAllocator>::num_elts_current () | |
| 467 { | |
| 468 return m_elts_allocated - m_elts_free; | |
| 469 } | |
| 470 | |
| 471 /* Specialization of base_pool_allocator which should be used in most cases. | |
| 472 Another specialization may be needed, if object size is greater than | |
| 473 memory_block_pool::block_size (64 KB). */ | |
| 474 typedef base_pool_allocator <memory_block_pool> pool_allocator; | |
| 475 | |
| 476 /* Type based memory pool allocator. */ | |
| 477 template <typename T> | |
| 478 class object_allocator | |
| 479 { | |
| 480 public: | |
| 481 /* Default constructor for pool allocator called NAME. */ | |
| 482 object_allocator (const char *name CXX_MEM_STAT_INFO): | |
| 483 m_allocator (name, sizeof (T) PASS_MEM_STAT) {} | |
| 484 | |
| 485 inline void | |
| 486 release () | |
| 487 { | |
| 488 m_allocator.release (); | |
| 489 } | |
| 490 | |
| 491 inline void release_if_empty () | |
| 492 { | |
| 493 m_allocator.release_if_empty (); | |
| 494 } | |
| 495 | |
| 496 | |
| 497 /* Allocate memory for instance of type T and call a default constructor. */ | |
| 498 | |
| 499 inline T * | |
| 500 allocate () ATTRIBUTE_MALLOC | |
| 501 { | |
| 502 return ::new (m_allocator.allocate ()) T; | |
| 503 } | |
| 504 | |
| 505 /* Allocate memory for instance of type T and return void * that | |
| 506 could be used in situations where a default constructor is not provided | |
| 507 by the class T. */ | |
| 508 | |
| 509 inline void * | |
| 510 allocate_raw () ATTRIBUTE_MALLOC | |
| 511 { | |
| 512 return m_allocator.allocate (); | |
| 513 } | |
| 514 | |
| 515 inline void | |
| 516 remove (T *object) | |
| 517 { | |
| 518 /* Call destructor. */ | |
| 519 object->~T (); | |
| 520 | |
| 521 m_allocator.remove (object); | |
| 522 } | |
| 523 | |
| 524 inline size_t | |
| 525 num_elts_current () | |
| 526 { | |
| 527 return m_allocator.num_elts_current (); | |
| 528 } | |
| 529 | |
| 530 private: | |
| 531 pool_allocator m_allocator; | |
| 532 }; | |
| 533 | |
| 534 /* Store information about each particular alloc_pool. Note that this | |
| 535 will underestimate the amount the amount of storage used by a small amount: | |
| 536 1) The overhead in a pool is not accounted for. | |
| 537 2) The unallocated elements in a block are not accounted for. Note | |
| 538 that this can at worst case be one element smaller that the block | |
| 539 size for that pool. */ | |
| 540 struct alloc_pool_descriptor | |
| 541 { | |
| 542 /* Number of pools allocated. */ | |
| 543 unsigned long created; | |
| 544 /* Gross allocated storage. */ | |
| 545 unsigned long allocated; | |
| 546 /* Amount of currently active storage. */ | |
| 547 unsigned long current; | |
| 548 /* Peak amount of storage used. */ | |
| 549 unsigned long peak; | |
| 550 /* Size of element in the pool. */ | |
| 551 int elt_size; | |
| 552 }; | |
| 553 | |
| 554 /* Helper for classes that do not provide default ctor. */ | |
| 555 | |
| 556 template <typename T> | |
| 557 inline void * | |
| 558 operator new (size_t, object_allocator<T> &a) | |
| 559 { | |
| 560 return a.allocate_raw (); | |
| 561 } | |
| 562 | |
| 563 /* Hashtable mapping alloc_pool names to descriptors. */ | |
| 564 extern hash_map<const char *, alloc_pool_descriptor> *alloc_pool_hash; | |
| 565 | |
| 566 | |
| 0 | 567 #endif |