Changes in libcfa/src/heap.cfa [1aa6ecb:cfbc703d]
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libcfa/src/heap.cfa (modified) (43 diffs)
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libcfa/src/heap.cfa
r1aa6ecb rcfbc703d 10 10 // Created On : Tue Dec 19 21:58:35 2017 11 11 // Last Modified By : Peter A. Buhr 12 // Last Modified On : Fri Oct 18 07:42:09 201913 // Update Count : 55612 // Last Modified On : Wed Apr 1 15:59:53 2020 13 // Update Count : 692 14 14 // 15 15 … … 18 18 #include <stdio.h> // snprintf, fileno 19 19 #include <errno.h> // errno 20 #include <string.h> // memset, memcpy 20 21 extern "C" { 21 22 #include <sys/mman.h> // mmap, munmap … … 27 28 #include "bits/locks.hfa" // __spinlock_t 28 29 #include "startup.hfa" // STARTUP_PRIORITY_MEMORY 29 #include "stdlib.hfa" // bsearchl30 //#include "stdlib.hfa" // bsearchl 30 31 #include "malloc.h" 31 32 33 #define MIN(x, y) (y > x ? x : y) 32 34 33 35 static bool traceHeap = false; 34 36 35 inline bool traceHeap() { 36 return traceHeap; 37 } // traceHeap 37 inline bool traceHeap() { return traceHeap; } 38 38 39 39 bool traceHeapOn() { … … 49 49 } // traceHeapOff 50 50 51 52 static bool checkFree = false; 53 54 inline bool checkFree() { 55 return checkFree; 56 } // checkFree 57 58 bool checkFreeOn() { 59 bool temp = checkFree; 60 checkFree = true; 51 bool traceHeapTerm() { return false; } 52 53 54 static bool prtFree = false; 55 56 inline bool prtFree() { 57 return prtFree; 58 } // prtFree 59 60 bool prtFreeOn() { 61 bool temp = prtFree; 62 prtFree = true; 61 63 return temp; 62 } // checkFreeOn63 64 bool checkFreeOff() {65 bool temp = checkFree;66 checkFree = false;64 } // prtFreeOn 65 66 bool prtFreeOff() { 67 bool temp = prtFree; 68 prtFree = false; 67 69 return temp; 68 } // checkFreeOff 69 70 71 // static bool traceHeapTerm = false; 72 73 // inline bool traceHeapTerm() { 74 // return traceHeapTerm; 75 // } // traceHeapTerm 76 77 // bool traceHeapTermOn() { 78 // bool temp = traceHeapTerm; 79 // traceHeapTerm = true; 80 // return temp; 81 // } // traceHeapTermOn 82 83 // bool traceHeapTermOff() { 84 // bool temp = traceHeapTerm; 85 // traceHeapTerm = false; 86 // return temp; 87 // } // traceHeapTermOff 70 } // prtFreeOff 88 71 89 72 90 73 enum { 74 // Define the default extension heap amount in units of bytes. When the uC++ supplied heap reaches the brk address, 75 // the brk address is extended by the extension amount. 76 __CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024), 77 78 // Define the mmap crossover point during allocation. Allocations less than this amount are allocated from buckets; 79 // values greater than or equal to this value are mmap from the operating system. 91 80 __CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1), 92 __CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024),93 81 }; 94 82 … … 105 93 static unsigned int allocFree; // running total of allocations minus frees 106 94 107 static void checkUnfreed() {95 static void prtUnfreed() { 108 96 if ( allocFree != 0 ) { 109 97 // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. 110 //char helpText[512];111 //int len = snprintf( helpText, sizeof(helpText), "CFA warning (UNIX pid:%ld) : program terminating with %u(0x%x) bytes of storage allocated but not freed.\n"112 //"Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n",113 //(long int)getpid(), allocFree, allocFree ); // always print the UNIX pid114 // __cfaabi_dbg_bits_write( helpText, len );115 } // if 116 } // checkUnfreed98 char helpText[512]; 99 int len = snprintf( helpText, sizeof(helpText), "CFA warning (UNIX pid:%ld) : program terminating with %u(0x%x) bytes of storage allocated but not freed.\n" 100 "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n", 101 (long int)getpid(), allocFree, allocFree ); // always print the UNIX pid 102 __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug 103 } // if 104 } // prtUnfreed 117 105 118 106 extern "C" { … … 123 111 void heapAppStop() { // called by __cfaabi_appready_startdown 124 112 fclose( stdin ); fclose( stdout ); 125 checkUnfreed();113 prtUnfreed(); 126 114 } // heapAppStop 127 115 } // extern "C" 128 116 #endif // __CFA_DEBUG__ 117 129 118 130 119 // statically allocated variables => zero filled. … … 134 123 static unsigned int maxBucketsUsed; // maximum number of buckets in use 135 124 136 137 // #comment TD : This defined is significantly different from the __ALIGN__ define from locks.hfa138 #define ALIGN 16139 125 140 126 #define SPINLOCK 0 … … 147 133 // Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage. 148 134 // Break recusion by hardcoding number of buckets and statically checking number is correct after bucket array defined. 149 enum { NoBucketSizes = 9 3}; // number of buckets sizes135 enum { NoBucketSizes = 91 }; // number of buckets sizes 150 136 151 137 struct HeapManager { … … 164 150 union { 165 151 // FreeHeader * home; // allocated block points back to home locations (must overlay alignment) 152 // 2nd low-order bit => zero filled 166 153 void * home; // allocated block points back to home locations (must overlay alignment) 167 154 size_t blockSize; // size for munmap (must overlay alignment) … … 183 170 struct FakeHeader { 184 171 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 185 uint32_t alignment; // low-order bits of home/blockSize used for tricks 172 // 1st low-order bit => fake header & alignment 173 uint32_t alignment; 186 174 #endif // __ORDER_LITTLE_ENDIAN__ 187 175 … … 193 181 } fake; // FakeHeader 194 182 } kind; // Kind 183 uint32_t dimension; // used by calloc-like to remember number of array elements 195 184 } header; // Header 196 char pad[ ALIGN- sizeof( Header )];185 char pad[libAlign() - sizeof( Header )]; 197 186 char data[0]; // storage 198 187 }; // Storage 199 188 200 static_assert( ALIGN >= sizeof( Storage ), "ALIGN< sizeof( Storage )" );189 static_assert( libAlign() >= sizeof( Storage ), "libAlign() < sizeof( Storage )" ); 201 190 202 191 struct FreeHeader { … … 228 217 #define __STATISTICS__ 229 218 219 // Bucket size must be multiple of 16. 230 220 // Powers of 2 are common allocation sizes, so make powers of 2 generate the minimum required size. 231 221 static const unsigned int bucketSizes[] @= { // different bucket sizes 232 16, 32, 48, 64, 233 64 + sizeof(HeapManager.Storage), 96, 112, 128, 128 + sizeof(HeapManager.Storage), 160, 192, 224, 234 256 + sizeof(HeapManager.Storage), 320, 384, 448, 512 + sizeof(HeapManager.Storage), 640, 768, 896, 235 1_024 + sizeof(HeapManager.Storage), 1_536, 2_048 + sizeof(HeapManager.Storage), 2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), 6_144, 236 8_192 + sizeof(HeapManager.Storage), 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 237 16_384 + sizeof(HeapManager.Storage), 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 238 32_768 + sizeof(HeapManager.Storage), 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 239 65_536 + sizeof(HeapManager.Storage), 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 240 131_072 + sizeof(HeapManager.Storage), 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 241 262_144 + sizeof(HeapManager.Storage), 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 242 524_288 + sizeof(HeapManager.Storage), 655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), 1_179_648, 1_310_720, 1_441_792, 243 1_572_864, 1_703_936, 1_835_008, 1_966_080, 2_097_152 + sizeof(HeapManager.Storage), 2_621_440, 3_145_728, 3_670_016, 244 4_194_304 + sizeof(HeapManager.Storage) 222 16, 32, 48, 64 + sizeof(HeapManager.Storage), // 4 223 96, 112, 128 + sizeof(HeapManager.Storage), // 3 224 160, 192, 224, 256 + sizeof(HeapManager.Storage), // 4 225 320, 384, 448, 512 + sizeof(HeapManager.Storage), // 4 226 640, 768, 896, 1_024 + sizeof(HeapManager.Storage), // 4 227 1_536, 2_048 + sizeof(HeapManager.Storage), // 2 228 2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), // 4 229 6_144, 8_192 + sizeof(HeapManager.Storage), // 2 230 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 16_384 + sizeof(HeapManager.Storage), // 8 231 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 32_768 + sizeof(HeapManager.Storage), // 8 232 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 65_536 + sizeof(HeapManager.Storage), // 8 233 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 131_072 + sizeof(HeapManager.Storage), // 8 234 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 262_144 + sizeof(HeapManager.Storage), // 8 235 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 524_288 + sizeof(HeapManager.Storage), // 8 236 655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), // 4 237 1_179_648, 1_310_720, 1_441_792, 1_572_864, 1_703_936, 1_835_008, 1_966_080, 2_097_152 + sizeof(HeapManager.Storage), // 8 238 2_621_440, 3_145_728, 3_670_016, 4_194_304 + sizeof(HeapManager.Storage), // 4 245 239 }; 246 240 … … 251 245 static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes 252 246 #endif // FASTLOOKUP 247 253 248 static int mmapFd = -1; // fake or actual fd for anonymous file 254 255 256 249 #ifdef __CFA_DEBUG__ 257 250 static bool heapBoot = 0; // detect recursion during boot … … 259 252 static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing 260 253 261 // #comment TD : The return type of this function should be commented262 static inline bool setMmapStart( size_t value ) {263 if ( value < pageSize || bucketSizes[NoBucketSizes - 1] < value ) return true;264 mmapStart = value; // set global265 266 // find the closest bucket size less than or equal to the mmapStart size267 maxBucketsUsed = bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search268 assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ?269 assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?270 return false;271 } // setMmapStart272 273 274 static void ?{}( HeapManager & manager ) with ( manager ) {275 pageSize = sysconf( _SC_PAGESIZE );276 277 for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists278 freeLists[i].blockSize = bucketSizes[i];279 } // for280 281 #ifdef FASTLOOKUP282 unsigned int idx = 0;283 for ( unsigned int i = 0; i < LookupSizes; i += 1 ) {284 if ( i > bucketSizes[idx] ) idx += 1;285 lookup[i] = idx;286 } // for287 #endif // FASTLOOKUP288 289 if ( setMmapStart( default_mmap_start() ) ) {290 abort( "HeapManager : internal error, mmap start initialization failure." );291 } // if292 heapExpand = default_heap_expansion();293 294 char * End = (char *)sbrk( 0 );295 sbrk( (char *)libCeiling( (long unsigned int)End, libAlign() ) - End ); // move start of heap to multiple of alignment296 heapBegin = heapEnd = sbrk( 0 ); // get new start point297 } // HeapManager298 299 300 static void ^?{}( HeapManager & ) {301 #ifdef __STATISTICS__302 // if ( traceHeapTerm() ) {303 // printStats();304 // if ( checkfree() ) checkFree( heapManager, true );305 // } // if306 #endif // __STATISTICS__307 } // ~HeapManager308 309 310 static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) ));311 void memory_startup( void ) {312 #ifdef __CFA_DEBUG__313 if ( unlikely( heapBoot ) ) { // check for recursion during system boot314 // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.315 abort( "boot() : internal error, recursively invoked during system boot." );316 } // if317 heapBoot = true;318 #endif // __CFA_DEBUG__319 320 //assert( heapManager.heapBegin != 0 );321 //heapManager{};322 if ( heapManager.heapBegin == 0 ) heapManager{};323 } // memory_startup324 325 static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) ));326 void memory_shutdown( void ) {327 ^heapManager{};328 } // memory_shutdown329 330 254 331 255 #ifdef __STATISTICS__ 332 static unsigned long long int mmap_storage; // heap statistics counters 256 // Heap statistics counters. 257 static unsigned long long int mmap_storage; 333 258 static unsigned int mmap_calls; 334 259 static unsigned long long int munmap_storage; … … 346 271 static unsigned long long int cmemalign_storage; 347 272 static unsigned int cmemalign_calls; 273 static unsigned long long int resize_storage; 274 static unsigned int resize_calls; 348 275 static unsigned long long int realloc_storage; 349 276 static unsigned int realloc_calls; 350 351 static int statfd; // statistics file descriptor (changed by malloc_stats_fd) 352 277 // Statistics file descriptor (changed by malloc_stats_fd). 278 static int statfd = STDERR_FILENO; // default stderr 353 279 354 280 // Use "write" because streams may be shutdown when calls are made. 355 281 static void printStats() { 356 282 char helpText[512]; 357 __cfaabi_ dbg_bits_print_buffer(helpText, sizeof(helpText),283 __cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText), 358 284 "\nHeap statistics:\n" 359 285 " malloc: calls %u / storage %llu\n" … … 361 287 " memalign: calls %u / storage %llu\n" 362 288 " cmemalign: calls %u / storage %llu\n" 289 " resize: calls %u / storage %llu\n" 363 290 " realloc: calls %u / storage %llu\n" 364 291 " free: calls %u / storage %llu\n" … … 370 297 memalign_calls, memalign_storage, 371 298 cmemalign_calls, cmemalign_storage, 299 resize_calls, resize_storage, 372 300 realloc_calls, realloc_storage, 373 301 free_calls, free_storage, … … 389 317 "<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n" 390 318 "<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n" 319 "<total type=\"resize\" count=\"%u\" size=\"%llu\"/>\n" 391 320 "<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n" 392 321 "<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n" … … 399 328 memalign_calls, memalign_storage, 400 329 cmemalign_calls, cmemalign_storage, 330 resize_calls, resize_storage, 401 331 realloc_calls, realloc_storage, 402 332 free_calls, free_storage, … … 405 335 sbrk_calls, sbrk_storage 406 336 ); 407 return write( fileno( stream ), helpText, len ); // -1 => error 337 __cfaabi_bits_write( fileno( stream ), helpText, len ); // ensures all bytes written or exit 338 return len; 408 339 } // printStatsXML 409 340 #endif // __STATISTICS__ 410 341 411 // #comment TD : Is this the samething as Out-of-Memory? 412 static inline void noMemory() { 413 abort( "Heap memory exhausted at %zu bytes.\n" 414 "Possible cause is very large memory allocation and/or large amount of unfreed storage allocated by the program or system/library routines.", 415 ((char *)(sbrk( 0 )) - (char *)(heapManager.heapBegin)) ); 416 } // noMemory 417 418 419 static inline void checkAlign( size_t alignment ) { 420 if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) { 421 abort( "Alignment %zu for memory allocation is less than sizeof(void *) and/or not a power of 2.", alignment ); 422 } // if 423 } // checkAlign 342 343 // static inline void noMemory() { 344 // abort( "Heap memory exhausted at %zu bytes.\n" 345 // "Possible cause is very large memory allocation and/or large amount of unfreed storage allocated by the program or system/library routines.", 346 // ((char *)(sbrk( 0 )) - (char *)(heapManager.heapBegin)) ); 347 // } // noMemory 424 348 425 349 … … 431 355 432 356 433 static inline void checkHeader( bool check, const char * name, void * addr ) { 434 if ( unlikely( check ) ) { // bad address ? 435 abort( "Attempt to %s storage %p with address outside the heap.\n" 436 "Possible cause is duplicate free on same block or overwriting of memory.", 437 name, addr ); 438 } // if 439 } // checkHeader 440 441 // #comment TD : function should be commented and/or have a more evocative name 442 // this isn't either a check or a constructor which is what I would expect this function to be 443 static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & size, size_t & alignment ) { 444 if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ? 445 size_t offset = header->kind.fake.offset; 446 alignment = header->kind.fake.alignment & -2; // remove flag from value 447 #ifdef __CFA_DEBUG__ 448 checkAlign( alignment ); // check alignment 449 #endif // __CFA_DEBUG__ 450 header = (HeapManager.Storage.Header *)((char *)header - offset); 451 } // if 452 } // fakeHeader 453 454 // #comment TD : Why is this a define 455 #define headerAddr( addr ) ((HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) )) 456 457 static inline bool headers( const char * name, void * addr, HeapManager.Storage.Header *& header, HeapManager.FreeHeader *& freeElem, size_t & size, size_t & alignment ) with ( heapManager ) { 458 header = headerAddr( addr ); 459 460 if ( unlikely( heapEnd < addr ) ) { // mmapped ? 461 fakeHeader( header, size, alignment ); 462 size = header->kind.real.blockSize & -3; // mmap size 463 return true; 464 } // if 465 466 #ifdef __CFA_DEBUG__ 467 checkHeader( addr < heapBegin || header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ? 468 #endif // __CFA_DEBUG__ 469 470 // #comment TD : This code looks weird... 471 // It's called as the first statement of both branches of the last if, with the same parameters in all cases 472 473 // header may be safe to dereference 474 fakeHeader( header, size, alignment ); 475 #ifdef __CFA_DEBUG__ 476 checkHeader( header < (HeapManager.Storage.Header *)heapBegin || (HeapManager.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -) 477 #endif // __CFA_DEBUG__ 478 479 freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3); 480 #ifdef __CFA_DEBUG__ 481 if ( freeElem < &freeLists[0] || &freeLists[NoBucketSizes] <= freeElem ) { 482 abort( "Attempt to %s storage %p with corrupted header.\n" 483 "Possible cause is duplicate free on same block or overwriting of header information.", 484 name, addr ); 485 } // if 486 #endif // __CFA_DEBUG__ 487 size = freeElem->blockSize; 488 return false; 489 } // headers 490 491 492 static inline void * extend( size_t size ) with ( heapManager ) { 493 lock( extlock __cfaabi_dbg_ctx2 ); 494 ptrdiff_t rem = heapRemaining - size; 495 if ( rem < 0 ) { 496 // If the size requested is bigger than the current remaining storage, increase the size of the heap. 497 498 size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() ); 499 if ( sbrk( increase ) == (void *)-1 ) { 500 unlock( extlock ); 501 errno = ENOMEM; 502 return 0; 503 } // if 504 #ifdef __STATISTICS__ 505 sbrk_calls += 1; 506 sbrk_storage += increase; 507 #endif // __STATISTICS__ 508 #ifdef __CFA_DEBUG__ 509 // Set new memory to garbage so subsequent uninitialized usages might fail. 510 memset( (char *)heapEnd + heapRemaining, '\377', increase ); 511 #endif // __CFA_DEBUG__ 512 rem = heapRemaining + increase - size; 513 } // if 514 515 HeapManager.Storage * block = (HeapManager.Storage *)heapEnd; 516 heapRemaining = rem; 517 heapEnd = (char *)heapEnd + size; 518 unlock( extlock ); 519 return block; 520 } // extend 521 522 357 // thunk problem 523 358 size_t Bsearchl( unsigned int key, const unsigned int * vals, size_t dim ) { 524 359 size_t l = 0, m, h = dim; … … 535 370 536 371 372 static inline bool setMmapStart( size_t value ) { // true => mmapped, false => sbrk 373 if ( value < pageSize || bucketSizes[NoBucketSizes - 1] < value ) return true; 374 mmapStart = value; // set global 375 376 // find the closest bucket size less than or equal to the mmapStart size 377 maxBucketsUsed = Bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search 378 assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ? 379 assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ? 380 return false; 381 } // setMmapStart 382 383 384 // <-------+----------------------------------------------------> bsize (bucket size) 385 // |header |addr 386 //================================================================================== 387 // align/offset | 388 // <-----------------<------------+-----------------------------> bsize (bucket size) 389 // |fake-header | addr 390 #define headerAddr( addr ) ((HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) )) 391 #define realHeader( header ) ((HeapManager.Storage.Header *)((char *)header - header->kind.fake.offset)) 392 393 // <-------<<--------------------- dsize ---------------------->> bsize (bucket size) 394 // |header |addr 395 //================================================================================== 396 // align/offset | 397 // <------------------------------<<---------- dsize --------->>> bsize (bucket size) 398 // |fake-header |addr 399 #define dataStorage( bsize, addr, header ) (bsize - ( (char *)addr - (char *)header )) 400 401 402 static inline void checkAlign( size_t alignment ) { 403 if ( alignment < libAlign() || ! libPow2( alignment ) ) { 404 abort( "Alignment %zu for memory allocation is less than %d and/or not a power of 2.", alignment, libAlign() ); 405 } // if 406 } // checkAlign 407 408 409 static inline void checkHeader( bool check, const char name[], void * addr ) { 410 if ( unlikely( check ) ) { // bad address ? 411 abort( "Attempt to %s storage %p with address outside the heap.\n" 412 "Possible cause is duplicate free on same block or overwriting of memory.", 413 name, addr ); 414 } // if 415 } // checkHeader 416 417 418 static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & alignment ) { 419 if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ? 420 alignment = header->kind.fake.alignment & -2; // remove flag from value 421 #ifdef __CFA_DEBUG__ 422 checkAlign( alignment ); // check alignment 423 #endif // __CFA_DEBUG__ 424 header = realHeader( header ); // backup from fake to real header 425 } // if 426 } // fakeHeader 427 428 429 static inline bool headers( const char name[] __attribute__(( unused )), void * addr, HeapManager.Storage.Header *& header, HeapManager.FreeHeader *& freeElem, size_t & size, size_t & alignment ) with ( heapManager ) { 430 header = headerAddr( addr ); 431 432 if ( unlikely( heapEnd < addr ) ) { // mmapped ? 433 fakeHeader( header, alignment ); 434 size = header->kind.real.blockSize & -3; // mmap size 435 return true; 436 } // if 437 438 #ifdef __CFA_DEBUG__ 439 checkHeader( addr < heapBegin || header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ? 440 #endif // __CFA_DEBUG__ 441 442 // header may be safe to dereference 443 fakeHeader( header, alignment ); 444 #ifdef __CFA_DEBUG__ 445 checkHeader( header < (HeapManager.Storage.Header *)heapBegin || (HeapManager.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -) 446 #endif // __CFA_DEBUG__ 447 448 freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3); 449 #ifdef __CFA_DEBUG__ 450 if ( freeElem < &freeLists[0] || &freeLists[NoBucketSizes] <= freeElem ) { 451 abort( "Attempt to %s storage %p with corrupted header.\n" 452 "Possible cause is duplicate free on same block or overwriting of header information.", 453 name, addr ); 454 } // if 455 #endif // __CFA_DEBUG__ 456 size = freeElem->blockSize; 457 return false; 458 } // headers 459 460 461 static inline void * extend( size_t size ) with ( heapManager ) { 462 lock( extlock __cfaabi_dbg_ctx2 ); 463 ptrdiff_t rem = heapRemaining - size; 464 if ( rem < 0 ) { 465 // If the size requested is bigger than the current remaining storage, increase the size of the heap. 466 467 size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() ); 468 if ( sbrk( increase ) == (void *)-1 ) { 469 unlock( extlock ); 470 errno = ENOMEM; 471 return 0p; 472 } // if 473 #ifdef __STATISTICS__ 474 sbrk_calls += 1; 475 sbrk_storage += increase; 476 #endif // __STATISTICS__ 477 #ifdef __CFA_DEBUG__ 478 // Set new memory to garbage so subsequent uninitialized usages might fail. 479 memset( (char *)heapEnd + heapRemaining, '\377', increase ); 480 #endif // __CFA_DEBUG__ 481 rem = heapRemaining + increase - size; 482 } // if 483 484 HeapManager.Storage * block = (HeapManager.Storage *)heapEnd; 485 heapRemaining = rem; 486 heapEnd = (char *)heapEnd + size; 487 unlock( extlock ); 488 return block; 489 } // extend 490 491 537 492 static inline void * doMalloc( size_t size ) with ( heapManager ) { 538 493 HeapManager.Storage * block; // pointer to new block of storage … … 541 496 // along with the block and is a multiple of the alignment size. 542 497 543 if ( unlikely( size > ~0ul - sizeof(HeapManager.Storage) ) ) return 0 ;498 if ( unlikely( size > ~0ul - sizeof(HeapManager.Storage) ) ) return 0p; 544 499 size_t tsize = size + sizeof(HeapManager.Storage); 545 500 if ( likely( tsize < mmapStart ) ) { // small size => sbrk … … 574 529 block = freeElem->freeList.pop(); 575 530 #endif // SPINLOCK 576 if ( unlikely( block == 0 ) ) {// no free block ?531 if ( unlikely( block == 0p ) ) { // no free block ? 577 532 #if defined( SPINLOCK ) 578 533 unlock( freeElem->lock ); … … 583 538 584 539 block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call 585 if ( unlikely( block == 0 ) ) return 0;586 #if defined( SPINLOCK )540 if ( unlikely( block == 0p ) ) return 0p; 541 #if defined( SPINLOCK ) 587 542 } else { 588 543 freeElem->freeList = block->header.kind.real.next; 589 544 unlock( freeElem->lock ); 590 #endif // SPINLOCK545 #endif // SPINLOCK 591 546 } // if 592 547 593 548 block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size 594 549 } else { // large size => mmap 595 if ( unlikely( size > ~0ul - pageSize ) ) return 0 ;550 if ( unlikely( size > ~0ul - pageSize ) ) return 0p; 596 551 tsize = libCeiling( tsize, pageSize ); // must be multiple of page size 597 552 #ifdef __STATISTICS__ … … 611 566 } // if 612 567 613 void * a rea= &(block->data); // adjust off header to user bytes568 void * addr = &(block->data); // adjust off header to user bytes 614 569 615 570 #ifdef __CFA_DEBUG__ 616 assert( ((uintptr_t)a rea& (libAlign() - 1)) == 0 ); // minimum alignment ?571 assert( ((uintptr_t)addr & (libAlign() - 1)) == 0 ); // minimum alignment ? 617 572 __atomic_add_fetch( &allocFree, tsize, __ATOMIC_SEQ_CST ); 618 573 if ( traceHeap() ) { 619 574 enum { BufferSize = 64 }; 620 575 char helpText[BufferSize]; 621 int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", a rea, size, tsize );622 // int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", a rea, size );623 __cfaabi_ dbg_bits_write( helpText, len );576 int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", addr, size, tsize ); 577 // int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", addr, size ); 578 __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug 624 579 } // if 625 580 #endif // __CFA_DEBUG__ 626 581 627 return a rea;582 return addr; 628 583 } // doMalloc 629 584 … … 631 586 static inline void doFree( void * addr ) with ( heapManager ) { 632 587 #ifdef __CFA_DEBUG__ 633 if ( unlikely( heapManager.heapBegin == 0 ) ) {588 if ( unlikely( heapManager.heapBegin == 0p ) ) { 634 589 abort( "doFree( %p ) : internal error, called before heap is initialized.", addr ); 635 590 } // if … … 677 632 char helpText[BufferSize]; 678 633 int len = snprintf( helpText, sizeof(helpText), "Free( %p ) size:%zu\n", addr, size ); 679 __cfaabi_ dbg_bits_write( helpText, len );634 __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug 680 635 } // if 681 636 #endif // __CFA_DEBUG__ … … 683 638 684 639 685 size_t checkFree( HeapManager & manager ) with ( manager ) {640 size_t prtFree( HeapManager & manager ) with ( manager ) { 686 641 size_t total = 0; 687 642 #ifdef __STATISTICS__ 688 __cfaabi_ dbg_bits_acquire();689 __cfaabi_ dbg_bits_print_nolock("\nBin lists (bin size : free blocks on list)\n" );643 __cfaabi_bits_acquire(); 644 __cfaabi_bits_print_nolock( STDERR_FILENO, "\nBin lists (bin size : free blocks on list)\n" ); 690 645 #endif // __STATISTICS__ 691 646 for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) { … … 696 651 697 652 #if defined( SPINLOCK ) 698 for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0 ; p = p->header.kind.real.next ) {653 for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0p; p = p->header.kind.real.next ) { 699 654 #else 700 for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0 ; p = p->header.kind.real.next.top ) {655 for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0p; p = p->header.kind.real.next.top ) { 701 656 #endif // SPINLOCK 702 657 total += size; … … 707 662 708 663 #ifdef __STATISTICS__ 709 __cfaabi_ dbg_bits_print_nolock("%7zu, %-7u ", size, N );710 if ( (i + 1) % 8 == 0 ) __cfaabi_ dbg_bits_print_nolock("\n" );664 __cfaabi_bits_print_nolock( STDERR_FILENO, "%7zu, %-7u ", size, N ); 665 if ( (i + 1) % 8 == 0 ) __cfaabi_bits_print_nolock( STDERR_FILENO, "\n" ); 711 666 #endif // __STATISTICS__ 712 667 } // for 713 668 #ifdef __STATISTICS__ 714 __cfaabi_ dbg_bits_print_nolock("\ntotal free blocks:%zu\n", total );715 __cfaabi_ dbg_bits_release();669 __cfaabi_bits_print_nolock( STDERR_FILENO, "\ntotal free blocks:%zu\n", total ); 670 __cfaabi_bits_release(); 716 671 #endif // __STATISTICS__ 717 672 return (char *)heapEnd - (char *)heapBegin - total; 718 } // checkFree 673 } // prtFree 674 675 676 static void ?{}( HeapManager & manager ) with ( manager ) { 677 pageSize = sysconf( _SC_PAGESIZE ); 678 679 for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists 680 freeLists[i].blockSize = bucketSizes[i]; 681 } // for 682 683 #ifdef FASTLOOKUP 684 unsigned int idx = 0; 685 for ( unsigned int i = 0; i < LookupSizes; i += 1 ) { 686 if ( i > bucketSizes[idx] ) idx += 1; 687 lookup[i] = idx; 688 } // for 689 #endif // FASTLOOKUP 690 691 if ( setMmapStart( default_mmap_start() ) ) { 692 abort( "HeapManager : internal error, mmap start initialization failure." ); 693 } // if 694 heapExpand = default_heap_expansion(); 695 696 char * end = (char *)sbrk( 0 ); 697 sbrk( (char *)libCeiling( (long unsigned int)end, libAlign() ) - end ); // move start of heap to multiple of alignment 698 heapBegin = heapEnd = sbrk( 0 ); // get new start point 699 } // HeapManager 700 701 702 static void ^?{}( HeapManager & ) { 703 #ifdef __STATISTICS__ 704 if ( traceHeapTerm() ) { 705 printStats(); 706 // if ( prtfree() ) prtFree( heapManager, true ); 707 } // if 708 #endif // __STATISTICS__ 709 } // ~HeapManager 710 711 712 static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) )); 713 void memory_startup( void ) { 714 #ifdef __CFA_DEBUG__ 715 if ( unlikely( heapBoot ) ) { // check for recursion during system boot 716 // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. 717 abort( "boot() : internal error, recursively invoked during system boot." ); 718 } // if 719 heapBoot = true; 720 #endif // __CFA_DEBUG__ 721 722 //assert( heapManager.heapBegin != 0 ); 723 //heapManager{}; 724 if ( heapManager.heapBegin == 0p ) heapManager{}; 725 } // memory_startup 726 727 static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) )); 728 void memory_shutdown( void ) { 729 ^heapManager{}; 730 } // memory_shutdown 719 731 720 732 721 733 static inline void * mallocNoStats( size_t size ) { // necessary for malloc statistics 722 734 //assert( heapManager.heapBegin != 0 ); 723 if ( unlikely( heapManager.heapBegin == 0 ) ) heapManager{}; // called before memory_startup ?724 void * a rea= doMalloc( size );725 if ( unlikely( a rea == 0) ) errno = ENOMEM; // POSIX726 return a rea;735 if ( unlikely( heapManager.heapBegin == 0p ) ) heapManager{}; // called before memory_startup ? 736 void * addr = doMalloc( size ); 737 if ( unlikely( addr == 0p ) ) errno = ENOMEM; // POSIX 738 return addr; 727 739 } // mallocNoStats 740 741 742 static inline void * callocNoStats( size_t noOfElems, size_t elemSize ) { 743 size_t size = noOfElems * elemSize; 744 char * addr = (char *)mallocNoStats( size ); 745 if ( unlikely( addr == 0p ) ) return 0p; 746 747 HeapManager.Storage.Header * header; 748 HeapManager.FreeHeader * freeElem; 749 size_t bsize, alignment; 750 bool mapped __attribute__(( unused )) = headers( "calloc", addr, header, freeElem, bsize, alignment ); 751 #ifndef __CFA_DEBUG__ 752 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. 753 if ( ! mapped ) 754 #endif // __CFA_DEBUG__ 755 // Zero entire data space even when > than size => realloc without a new allocation and zero fill works. 756 // <-------00000000000000000000000000000000000000000000000000000> bsize (bucket size) 757 // `-header`-addr `-size 758 memset( addr, '\0', bsize - sizeof(HeapManager.Storage) ); // set to zeros 759 760 assert( noOfElems <= UINT32_MAX ); 761 header->dimension = noOfElems; // store number of array elements 762 header->kind.real.blockSize |= 2; // mark as zero filled 763 return addr; 764 } // callocNoStats 728 765 729 766 … … 745 782 // subtract libAlign() because it is already the minimum alignment 746 783 // add sizeof(Storage) for fake header 747 // #comment TD : this is the only place that calls doMalloc without calling mallocNoStats, why ? 748 char * area = (char *)doMalloc( size + alignment - libAlign() + sizeof(HeapManager.Storage) ); 749 if ( unlikely( area == 0 ) ) return area; 784 char * addr = (char *)mallocNoStats( size + alignment - libAlign() + sizeof(HeapManager.Storage) ); 785 if ( unlikely( addr == 0p ) ) return addr; 750 786 751 787 // address in the block of the "next" alignment address 752 char * user = (char *)libCeiling( (uintptr_t)(a rea+ sizeof(HeapManager.Storage)), alignment );788 char * user = (char *)libCeiling( (uintptr_t)(addr + sizeof(HeapManager.Storage)), alignment ); 753 789 754 790 // address of header from malloc 755 HeapManager.Storage.Header * realHeader = headerAddr( a rea);791 HeapManager.Storage.Header * realHeader = headerAddr( addr ); 756 792 // address of fake header * before* the alignment location 757 793 HeapManager.Storage.Header * fakeHeader = headerAddr( user ); … … 763 799 return user; 764 800 } // memalignNoStats 801 802 803 static inline void * cmemalignNoStats( size_t alignment, size_t noOfElems, size_t elemSize ) { 804 size_t size = noOfElems * elemSize; 805 char * addr = (char *)memalignNoStats( alignment, size ); 806 if ( unlikely( addr == 0p ) ) return 0p; 807 HeapManager.Storage.Header * header; 808 HeapManager.FreeHeader * freeElem; 809 size_t bsize; 810 bool mapped __attribute__(( unused )) = headers( "cmemalign", addr, header, freeElem, bsize, alignment ); 811 #ifndef __CFA_DEBUG__ 812 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. 813 if ( ! mapped ) 814 #endif // __CFA_DEBUG__ 815 memset( addr, '\0', dataStorage( bsize, addr, header ) ); // set to zeros 816 817 assert( noOfElems <= UINT32_MAX ); 818 header->dimension = noOfElems; // store initial array size 819 header->kind.real.blockSize |= 2; // mark as zero filled 820 return addr; 821 } // cmemalignNoStats 765 822 766 823 … … 775 832 776 833 extern "C" { 777 // The malloc() function allocates size bytes and returns a pointer to the allocated memory. The memory is not 778 // initialized. If size is 0, then malloc() returns either NULL, or a unique pointer value that can later be 779 // successfully passed to free(). 834 // Allocates size bytes and returns a pointer to the allocated memory. The memory is not initialized. If size is 0, 835 // then malloc() returns either 0p, or a unique pointer value that can later be successfully passed to free(). 780 836 void * malloc( size_t size ) { 781 837 #ifdef __STATISTICS__ … … 787 843 } // malloc 788 844 789 // The calloc() function allocates memory for an array of nmemb elements of size bytes each and returns a pointer to790 // the allocated memory. The memory is set to zero. If nmemb or size is 0, then calloc() returns either NULL, or a791 // unique pointervalue that can later be successfully passed to free().845 // Allocate memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated 846 // memory. The memory is set to zero. If nmemb or size is 0, then calloc() returns either 0p, or a unique pointer 847 // value that can later be successfully passed to free(). 792 848 void * calloc( size_t noOfElems, size_t elemSize ) { 793 size_t size = noOfElems * elemSize;794 849 #ifdef __STATISTICS__ 795 850 __atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST ); 796 __atomic_add_fetch( &calloc_storage, size, __ATOMIC_SEQ_CST ); 797 #endif // __STATISTICS__ 798 799 char * area = (char *)mallocNoStats( size ); 800 if ( unlikely( area == 0 ) ) return 0; 851 __atomic_add_fetch( &calloc_storage, noOfElems * elemSize, __ATOMIC_SEQ_CST ); 852 #endif // __STATISTICS__ 853 854 return callocNoStats( noOfElems, elemSize ); 855 } // calloc 856 857 // Change the size of the memory block pointed to by ptr to size bytes. The contents are undefined. If ptr is 0p, 858 // then the call is equivalent to malloc(size), for all values of size; if size is equal to zero, and ptr is not 0p, 859 // then the call is equivalent to free(ptr). Unless ptr is 0p, it must have been returned by an earlier call to 860 // malloc(), calloc() or realloc(). If the area pointed to was moved, a free(ptr) is done. 861 862 void * resize( void * oaddr, size_t size ) { 863 #ifdef __STATISTICS__ 864 __atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST ); 865 __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); 866 #endif // __STATISTICS__ 867 868 // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. 869 if ( unlikely( size == 0 ) ) { free( oaddr ); return mallocNoStats( size ); } // special cases 870 if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size ); 801 871 802 872 HeapManager.Storage.Header * header; 803 873 HeapManager.FreeHeader * freeElem; 804 size_t asize, alignment; 805 bool mapped __attribute__(( unused )) = headers( "calloc", area, header, freeElem, asize, alignment ); 806 #ifndef __CFA_DEBUG__ 807 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. 808 if ( ! mapped ) 809 #endif // __CFA_DEBUG__ 810 memset( area, '\0', asize - sizeof(HeapManager.Storage) ); // set to zeros 811 812 header->kind.real.blockSize |= 2; // mark as zero filled 813 return area; 814 } // calloc 815 816 // #comment TD : Document this function 817 void * cmemalign( size_t alignment, size_t noOfElems, size_t elemSize ) { 818 size_t size = noOfElems * elemSize; 819 #ifdef __STATISTICS__ 820 __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); 821 __atomic_add_fetch( &cmemalign_storage, size, __ATOMIC_SEQ_CST ); 822 #endif // __STATISTICS__ 823 824 char * area = (char *)memalignNoStats( alignment, size ); 825 if ( unlikely( area == 0 ) ) return 0; 874 size_t bsize, oalign = 0; 875 headers( "resize", oaddr, header, freeElem, bsize, oalign ); 876 size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket 877 878 // same size, DO NOT preserve STICKY PROPERTIES. 879 if ( oalign == 0 && size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size 880 header->kind.real.blockSize &= -2; // no alignment and turn off 0 fill 881 return oaddr; 882 } // if 883 884 // change size, DO NOT preserve STICKY PROPERTIES. 885 void * naddr = mallocNoStats( size ); // create new area 886 free( oaddr ); 887 return naddr; 888 } // resize 889 890 891 // Same as resize but the contents shall be unchanged in the range from the start of the region up to the minimum of 892 // the old and new sizes. 893 void * realloc( void * oaddr, size_t size ) { 894 #ifdef __STATISTICS__ 895 __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); 896 __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); 897 #endif // __STATISTICS__ 898 899 // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. 900 if ( unlikely( size == 0 ) ) { free( oaddr ); return mallocNoStats( size ); } // special cases 901 if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size ); 902 826 903 HeapManager.Storage.Header * header; 827 904 HeapManager.FreeHeader * freeElem; 828 size_t asize; 829 bool mapped __attribute__(( unused )) = headers( "cmemalign", area, header, freeElem, asize, alignment ); 830 #ifndef __CFA_DEBUG__ 831 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. 832 if ( ! mapped ) 833 #endif // __CFA_DEBUG__ 834 memset( area, '\0', asize - ( (char *)area - (char *)header ) ); // set to zeros 835 header->kind.real.blockSize |= 2; // mark as zero filled 836 837 return area; 838 } // cmemalign 839 840 // The realloc() function changes the size of the memory block pointed to by ptr to size bytes. The contents will be 841 // unchanged in the range from the start of the region up to the minimum of the old and new sizes. If the new size 842 // is larger than the old size, the added memory will not be initialized. If ptr is NULL, then the call is 843 // equivalent to malloc(size), for all values of size; if size is equal to zero, and ptr is not NULL, then the call 844 // is equivalent to free(ptr). Unless ptr is NULL, it must have been returned by an earlier call to malloc(), 845 // calloc() or realloc(). If the area pointed to was moved, a free(ptr) is done. 846 void * realloc( void * addr, size_t size ) { 847 #ifdef __STATISTICS__ 848 __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); 849 #endif // __STATISTICS__ 850 851 if ( unlikely( addr == 0 ) ) return mallocNoStats( size ); // special cases 852 if ( unlikely( size == 0 ) ) { free( addr ); return 0; } 853 854 HeapManager.Storage.Header * header; 855 HeapManager.FreeHeader * freeElem; 856 size_t asize, alignment = 0; 857 headers( "realloc", addr, header, freeElem, asize, alignment ); 858 859 size_t usize = asize - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block 860 if ( usize >= size ) { // already sufficient storage 861 // This case does not result in a new profiler entry because the previous one still exists and it must match with 862 // the free for this memory. Hence, this realloc does not appear in the profiler output. 863 return addr; 864 } // if 865 866 #ifdef __STATISTICS__ 867 __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); 868 #endif // __STATISTICS__ 869 870 void * area; 871 if ( unlikely( alignment != 0 ) ) { // previous request memalign? 872 area = memalign( alignment, size ); // create new aligned area 905 size_t bsize, oalign = 0; 906 headers( "realloc", oaddr, header, freeElem, bsize, oalign ); 907 908 size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket 909 if ( size <= odsize && odsize <= size * 2 ) { // allow up to 50% wasted storage in smaller size 910 // Do not know size of original allocation => cannot do 0 fill for any additional space because do not know 911 // where to start filling, i.e., do not overwrite existing values in space. 912 return oaddr; 913 } // if 914 915 // change size and copy old content to new storage 916 917 void * naddr; 918 if ( unlikely( oalign != 0 ) ) { // previous request memalign? 919 if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill 920 naddr = cmemalignNoStats( oalign, 1, size ); // create new aligned area 921 } else { 922 naddr = memalignNoStats( oalign, size ); // create new aligned area 923 } // if 873 924 } else { 874 area = mallocNoStats( size ); // create new area 875 } // if 876 if ( unlikely( area == 0 ) ) return 0; 877 if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill (calloc/cmemalign) ? 878 assert( (header->kind.real.blockSize & 1) == 0 ); 879 bool mapped __attribute__(( unused )) = headers( "realloc", area, header, freeElem, asize, alignment ); 880 #ifndef __CFA_DEBUG__ 881 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. 882 if ( ! mapped ) 883 #endif // __CFA_DEBUG__ 884 memset( (char *)area + usize, '\0', asize - ( (char *)area - (char *)header ) - usize ); // zero-fill back part 885 header->kind.real.blockSize |= 2; // mark new request as zero fill 886 } // if 887 memcpy( area, addr, usize ); // copy bytes 888 free( addr ); 889 return area; 925 if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill 926 naddr = callocNoStats( 1, size ); // create new area 927 } else { 928 naddr = mallocNoStats( size ); // create new area 929 } // if 930 } // if 931 if ( unlikely( naddr == 0p ) ) return 0p; 932 933 headers( "realloc", naddr, header, freeElem, bsize, oalign ); 934 size_t ndsize = dataStorage( bsize, naddr, header ); // data storage avilable in bucket 935 // To preserve prior fill, the entire bucket must be copied versus the size. 936 memcpy( naddr, oaddr, MIN( odsize, ndsize ) ); // copy bytes 937 free( oaddr ); 938 return naddr; 890 939 } // realloc 891 940 892 // The obsolete function memalign() allocates size bytes and returns a pointer to the allocated memory. The memory893 // a ddress will be a multiple of alignment, which must be a power of two.941 // Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of 942 // alignment, which must be a power of two. (obsolete) 894 943 void * memalign( size_t alignment, size_t size ) { 895 944 #ifdef __STATISTICS__ … … 898 947 #endif // __STATISTICS__ 899 948 900 void * area = memalignNoStats( alignment, size ); 901 902 return area; 949 return memalignNoStats( alignment, size ); 903 950 } // memalign 904 951 905 // The function aligned_alloc() is the same as memalign(), except for the added restriction that size should be a 906 // multiple of alignment. 952 953 // Same as calloc() with memory alignment. 954 void * cmemalign( size_t alignment, size_t noOfElems, size_t elemSize ) { 955 #ifdef __STATISTICS__ 956 __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); 957 __atomic_add_fetch( &cmemalign_storage, noOfElems * elemSize, __ATOMIC_SEQ_CST ); 958 #endif // __STATISTICS__ 959 960 return cmemalignNoStats( alignment, noOfElems, elemSize ); 961 } // cmemalign 962 963 // Same as memalign(), but ISO/IEC 2011 C11 Section 7.22.2 states: the value of size shall be an integral multiple 964 // of alignment. This requirement is universally ignored. 907 965 void * aligned_alloc( size_t alignment, size_t size ) { 908 966 return memalign( alignment, size ); … … 910 968 911 969 912 // The function posix_memalign() allocates size bytes and places the address of the allocated memory in *memptr. The913 // address of the allocated memory will be a multiple of alignment, which must be a power of two and a multiple of914 // sizeof(void *). If size is 0, then posix_memalign() returns either NULL, or a unique pointer value that can later915 // be successfully passed tofree(3).970 // Allocates size bytes and places the address of the allocated memory in *memptr. The address of the allocated 971 // memory shall be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). If size 972 // is 0, then posix_memalign() returns either 0p, or a unique pointer value that can later be successfully passed to 973 // free(3). 916 974 int posix_memalign( void ** memptr, size_t alignment, size_t size ) { 917 975 if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) return EINVAL; // check alignment 918 976 * memptr = memalign( alignment, size ); 919 if ( unlikely( * memptr == 0 ) ) return ENOMEM;977 if ( unlikely( * memptr == 0p ) ) return ENOMEM; 920 978 return 0; 921 979 } // posix_memalign 922 980 923 // The obsolete function valloc() allocates size bytes and returns a pointer to the allocated memory. The memory924 // address will be a multiple of thepage size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).981 // Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of the 982 // page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size). 925 983 void * valloc( size_t size ) { 926 984 return memalign( pageSize, size ); … … 928 986 929 987 930 // The free() function frees the memory space pointed to by ptr, which must have been returned by a previous call to 931 // malloc(), calloc() or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behavior 932 // occurs. If ptr is NULL, no operation is performed. 988 // Same as valloc but rounds size to multiple of page size. 989 void * pvalloc( size_t size ) { 990 return memalign( pageSize, libCeiling( size, pageSize ) ); 991 } // pvalloc 992 993 994 // Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc() 995 // or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behavior occurs. If ptr is 996 // 0p, no operation is performed. 933 997 void free( void * addr ) { 934 998 #ifdef __STATISTICS__ … … 936 1000 #endif // __STATISTICS__ 937 1001 938 // #comment TD : To decrease nesting I would but the special case in the 939 // else instead, plus it reads more naturally to have the 940 // short / normal case instead 941 if ( unlikely( addr == 0 ) ) { // special case 942 #ifdef __CFA_DEBUG__ 943 if ( traceHeap() ) { 944 #define nullmsg "Free( 0x0 ) size:0\n" 945 // Do not debug print free( 0 ), as it can cause recursive entry from sprintf. 946 __cfaabi_dbg_bits_write( nullmsg, sizeof(nullmsg) - 1 ); 947 } // if 948 #endif // __CFA_DEBUG__ 1002 if ( unlikely( addr == 0p ) ) { // special case 1003 // #ifdef __CFA_DEBUG__ 1004 // if ( traceHeap() ) { 1005 // #define nullmsg "Free( 0x0 ) size:0\n" 1006 // // Do not debug print free( 0p ), as it can cause recursive entry from sprintf. 1007 // __cfaabi_dbg_write( nullmsg, sizeof(nullmsg) - 1 ); 1008 // } // if 1009 // #endif // __CFA_DEBUG__ 949 1010 return; 950 1011 } // exit … … 953 1014 } // free 954 1015 955 // The mallopt() function adjusts parameters that control the behavior of the memory-allocation functions (see 956 // malloc(3)). The param argument specifies the parameter to be modified, and value specifies the new value for that 957 // parameter. 958 int mallopt( int option, int value ) { 959 choose( option ) { 960 case M_TOP_PAD: 961 if ( setHeapExpand( value ) ) fallthru default; 962 case M_MMAP_THRESHOLD: 963 if ( setMmapStart( value ) ) fallthru default; 964 default: 965 // #comment TD : 1 for unsopported feels wrong 966 return 1; // success, or unsupported 967 } // switch 968 return 0; // error 969 } // mallopt 970 971 // The malloc_trim() function attempts to release free memory at the top of the heap (by calling sbrk(2) with a 972 // suitable argument). 973 int malloc_trim( size_t ) { 974 return 0; // => impossible to release memory 975 } // malloc_trim 976 977 // The malloc_usable_size() function returns the number of usable bytes in the block pointed to by ptr, a pointer to 978 // a block of memory allocated by malloc(3) or a related function. 979 size_t malloc_usable_size( void * addr ) { 980 if ( unlikely( addr == 0 ) ) return 0; // null allocation has 0 size 981 982 HeapManager.Storage.Header * header; 983 HeapManager.FreeHeader * freeElem; 984 size_t size, alignment; 985 986 headers( "malloc_usable_size", addr, header, freeElem, size, alignment ); 987 size_t usize = size - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block 988 return usize; 989 } // malloc_usable_size 990 991 992 // The malloc_alignment() function returns the alignment of the allocation. 1016 1017 // Returns the alignment of the allocation. 993 1018 size_t malloc_alignment( void * addr ) { 994 if ( unlikely( addr == 0 ) ) return libAlign(); // minimum alignment1019 if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment 995 1020 HeapManager.Storage.Header * header = headerAddr( addr ); 996 1021 if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? 997 1022 return header->kind.fake.alignment & -2; // remove flag from value 998 1023 } else { 999 return libAlign (); // minimum alignment1024 return libAlign(); // minimum alignment 1000 1025 } // if 1001 1026 } // malloc_alignment 1002 1027 1003 1028 1004 // The malloc_zero_fill() function returns true if the allocation is zero filled, i.e., initially allocated by calloc().1029 // Returns true if the allocation is zero filled, i.e., initially allocated by calloc(). 1005 1030 bool malloc_zero_fill( void * addr ) { 1006 if ( unlikely( addr == 0 ) ) return false; // null allocation is not zero fill1031 if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill 1007 1032 HeapManager.Storage.Header * header = headerAddr( addr ); 1008 1033 if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? 1009 header = (HeapManager.Storage.Header *)((char *)header - header->kind.fake.offset);1034 header = realHeader( header ); // backup from fake to real header 1010 1035 } // if 1011 1036 return (header->kind.real.blockSize & 2) != 0; // zero filled (calloc/cmemalign) ? … … 1013 1038 1014 1039 1015 // The malloc_stats() function prints (on default standard error) statistics about memory allocated by malloc(3) and 1016 // related functions. 1040 // Returns number of elements if the allocation is for an array, i.e., by calloc(). 1041 size_t malloc_dimension( void * addr ) { 1042 if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill 1043 HeapManager.Storage.Header * header = headerAddr( addr ); 1044 if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? 1045 header = realHeader( header ); // backup from fake to real header 1046 } // if 1047 return header->dimension; // array (calloc/cmemalign) 1048 } // malloc_zero_fill 1049 1050 1051 // Returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allocated by 1052 // malloc or a related function. 1053 size_t malloc_usable_size( void * addr ) { 1054 if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size 1055 HeapManager.Storage.Header * header; 1056 HeapManager.FreeHeader * freeElem; 1057 size_t bsize, alignment; 1058 1059 headers( "malloc_usable_size", addr, header, freeElem, bsize, alignment ); 1060 return dataStorage( bsize, addr, header ); // data storage in bucket 1061 } // malloc_usable_size 1062 1063 1064 // Prints (on default standard error) statistics about memory allocated by malloc and related functions. 1017 1065 void malloc_stats( void ) { 1018 1066 #ifdef __STATISTICS__ 1019 1067 printStats(); 1020 if ( checkFree() ) checkFree( heapManager );1068 if ( prtFree() ) prtFree( heapManager ); 1021 1069 #endif // __STATISTICS__ 1022 1070 } // malloc_stats 1023 1071 1024 // The malloc_stats_fd() function changes the file descripter where malloc_stats() writes thestatistics.1025 int malloc_stats_fd( int fd ) {1072 // Changes the file descripter where malloc_stats() writes statistics. 1073 int malloc_stats_fd( int fd __attribute__(( unused )) ) { 1026 1074 #ifdef __STATISTICS__ 1027 1075 int temp = statfd; … … 1033 1081 } // malloc_stats_fd 1034 1082 1035 // The malloc_info() function exports an XML string that describes the current state of the memory-allocation 1036 // implementation in the caller. The string is printed on the file stream stream. The exported string includes 1037 // information about all arenas (see malloc(3)). 1083 1084 // Adjusts parameters that control the behavior of the memory-allocation functions (see malloc). The param argument 1085 // specifies the parameter to be modified, and value specifies the new value for that parameter. 1086 int mallopt( int option, int value ) { 1087 choose( option ) { 1088 case M_TOP_PAD: 1089 if ( setHeapExpand( value ) ) return 1; 1090 case M_MMAP_THRESHOLD: 1091 if ( setMmapStart( value ) ) return 1; 1092 } // switch 1093 return 0; // error, unsupported 1094 } // mallopt 1095 1096 // Attempt to release free memory at the top of the heap (by calling sbrk with a suitable argument). 1097 int malloc_trim( size_t ) { 1098 return 0; // => impossible to release memory 1099 } // malloc_trim 1100 1101 1102 // Exports an XML string that describes the current state of the memory-allocation implementation in the caller. 1103 // The string is printed on the file stream stream. The exported string includes information about all arenas (see 1104 // malloc). 1038 1105 int malloc_info( int options, FILE * stream ) { 1106 if ( options != 0 ) { errno = EINVAL; return -1; } 1039 1107 return printStatsXML( stream ); 1040 1108 } // malloc_info 1041 1109 1042 1110 1043 // The malloc_get_state() function records the current state of all malloc(3) internal bookkeeping variables (but1044 // not the actual contents of the heap or the state of malloc_hook(3) functions pointers). The state is recorded in1045 // a system-dependent opaque data structure dynamically allocated via malloc(3), and a pointer to that data1046 // structure is returned as the function result. (It is the caller's responsibility to free(3)this memory.)1111 // Records the current state of all malloc internal bookkeeping variables (but not the actual contents of the heap 1112 // or the state of malloc_hook functions pointers). The state is recorded in a system-dependent opaque data 1113 // structure dynamically allocated via malloc, and a pointer to that data structure is returned as the function 1114 // result. (The caller must free this memory.) 1047 1115 void * malloc_get_state( void ) { 1048 return 0 ; // unsupported1116 return 0p; // unsupported 1049 1117 } // malloc_get_state 1050 1118 1051 1119 1052 // The malloc_set_state() function restores the state of all malloc(3) internal bookkeeping variables to the values1053 // recorded in the opaque datastructure pointed to by state.1120 // Restores the state of all malloc internal bookkeeping variables to the values recorded in the opaque data 1121 // structure pointed to by state. 1054 1122 int malloc_set_state( void * ptr ) { 1055 1123 return 0; // unsupported … … 1058 1126 1059 1127 1128 // Must have CFA linkage to overload with C linkage realloc. 1129 void * resize( void * oaddr, size_t nalign, size_t size ) { 1130 #ifdef __STATISTICS__ 1131 __atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST ); 1132 __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); 1133 #endif // __STATISTICS__ 1134 1135 // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. 1136 if ( unlikely( size == 0 ) ) { free( oaddr ); return memalignNoStats( nalign, size ); } // special cases 1137 if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size ); 1138 1139 1140 if ( unlikely( nalign == 0 ) ) nalign = libAlign(); // reset alignment to minimum 1141 #ifdef __CFA_DEBUG__ 1142 else 1143 checkAlign( nalign ); // check alignment 1144 #endif // __CFA_DEBUG__ 1145 1146 HeapManager.Storage.Header * header; 1147 HeapManager.FreeHeader * freeElem; 1148 size_t bsize, oalign = 0; 1149 headers( "resize", oaddr, header, freeElem, bsize, oalign ); 1150 size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket 1151 1152 if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match 1153 if ( oalign >= libAlign() ) { // fake header ? 1154 headerAddr( oaddr )->kind.fake.alignment = nalign | 1; // update alignment (could be the same) 1155 } // if 1156 if ( size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size 1157 header->kind.real.blockSize &= -2; // turn off 0 fill 1158 return oaddr; 1159 } // if 1160 } // if 1161 1162 // change size 1163 1164 void * naddr; 1165 if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill 1166 naddr = cmemalignNoStats( nalign, 1, size ); // create new aligned area 1167 } else { 1168 naddr = memalignNoStats( nalign, size ); // create new aligned area 1169 } // if 1170 1171 free( oaddr ); 1172 return naddr; 1173 } // resize 1174 1175 1176 void * realloc( void * oaddr, size_t nalign, size_t size ) { 1177 if ( unlikely( nalign == 0 ) ) nalign = libAlign(); // reset alignment to minimum 1178 #ifdef __CFA_DEBUG__ 1179 else 1180 checkAlign( nalign ); // check alignment 1181 #endif // __CFA_DEBUG__ 1182 1183 HeapManager.Storage.Header * header; 1184 HeapManager.FreeHeader * freeElem; 1185 size_t bsize, oalign = 0; 1186 headers( "realloc", oaddr, header, freeElem, bsize, oalign ); 1187 size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket 1188 1189 if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match 1190 if ( oalign >= libAlign() ) { // fake header ? 1191 headerAddr( oaddr )->kind.fake.alignment = nalign | 1; // update alignment (could be the same) 1192 } // if 1193 return realloc( oaddr, size ); 1194 } // if 1195 1196 // change size and copy old content to new storage 1197 1198 #ifdef __STATISTICS__ 1199 __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); 1200 __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); 1201 #endif // __STATISTICS__ 1202 1203 // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. 1204 if ( unlikely( size == 0 ) ) { free( oaddr ); return memalignNoStats( nalign, size ); } // special cases 1205 if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size ); 1206 1207 void * naddr; 1208 if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill 1209 naddr = cmemalignNoStats( nalign, 1, size ); // create new aligned area 1210 } else { 1211 naddr = memalignNoStats( nalign, size ); // create new aligned area 1212 } // if 1213 1214 headers( "realloc", naddr, header, freeElem, bsize, oalign ); 1215 size_t ndsize = dataStorage( bsize, naddr, header ); // data storage available in bucket 1216 // To preserve prior fill, the entire bucket must be copied versus the size. 1217 memcpy( naddr, oaddr, MIN( odsize, ndsize ) ); // copy bytes 1218 free( oaddr ); 1219 return naddr; 1220 } // realloc 1221 1222 1060 1223 // Local Variables: // 1061 1224 // tab-width: 4 //
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