source: libcfa/src/heap.cfa@ fe293bf

Last change on this file since fe293bf was 1e7a765, checked in by Peter A. Buhr <pabuhr@…>, 2 years ago

fix lock/unlock for heap statistic-mode
  • Property mode set to 100644
File size: 68.3 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// heap.cfa --
8//
9// Author : Peter A. Buhr
10// Created On : Tue Dec 19 21:58:35 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Sat Sep 30 17:31:15 2023
13// Update Count : 1617
14//
15
16#include <stdio.h>
17#include <string.h> // memset, memcpy
18#include <limits.h> // ULONG_MAX
19#include <errno.h> // errno, ENOMEM, EINVAL
20#include <unistd.h> // STDERR_FILENO, sbrk, sysconf, write
21#include <sys/mman.h> // mmap, munmap
22extern "C" {
23#include <sys/sysinfo.h> // get_nprocs
24} // extern "C"
25
26#include "heap.hfa"
27#include "bits/align.hfa" // libAlign
28#include "bits/defs.hfa" // likely, unlikely
29#include "concurrency/kernel/fwd.hfa" // __POLL_PREEMPTION
30#include "startup.hfa" // STARTUP_PRIORITY_MEMORY
31#include "math.hfa" // ceiling, min
32#include "bitmanip.hfa" // is_pow2, ceiling2
33
34// supported mallopt options
35#ifndef M_MMAP_THRESHOLD
36#define M_MMAP_THRESHOLD (-1)
37#endif // M_MMAP_THRESHOLD
38
39#ifndef M_TOP_PAD
40#define M_TOP_PAD (-2)
41#endif // M_TOP_PAD
42
43#define FASTLOOKUP // use O(1) table lookup from allocation size to bucket size
44#define OWNERSHIP // return freed memory to owner thread
45#define RETURNSPIN // toggle spinlock / lockfree queue
46#if ! defined( OWNERSHIP ) && defined( RETURNSPIN )
47#warning "RETURNSPIN is ignored without OWNERSHIP; suggest commenting out RETURNSPIN"
48#endif // ! OWNERSHIP && RETURNSPIN
49
50#define CACHE_ALIGN 64
51#define CALIGN __attribute__(( aligned(CACHE_ALIGN) ))
52
53#define TLSMODEL __attribute__(( tls_model("initial-exec") ))
54
55#define __STATISTICS__
56
57enum {
58 // The default extension heap amount in units of bytes. When the current heap reaches the brk address, the brk
59 // address is extended by the extension amount.
60 __CFA_DEFAULT_HEAP_EXPANSION__ = 10 * 1024 * 1024,
61
62 // The mmap crossover point during allocation. Allocations less than this amount are allocated from buckets; values
63 // greater than or equal to this value are mmap from the operating system.
64 __CFA_DEFAULT_MMAP_START__ = 512 * 1024 + 1,
65
66 // The default unfreed storage amount in units of bytes. When the uC++ program ends it subtracts this amount from
67 // the malloc/free counter to adjust for storage the program does not free.
68 __CFA_DEFAULT_HEAP_UNFREED__ = 0
69}; // enum
70
71
72//####################### Heap Trace/Print ####################
73
74
75static bool traceHeap = false;
76
77inline bool traceHeap() libcfa_public { return traceHeap; }
78
79bool traceHeapOn() libcfa_public {
80 bool temp = traceHeap;
81 traceHeap = true;
82 return temp;
83} // traceHeapOn
84
85bool traceHeapOff() libcfa_public {
86 bool temp = traceHeap;
87 traceHeap = false;
88 return temp;
89} // traceHeapOff
90
91bool traceHeapTerm() libcfa_public { return false; }
92
93
94static bool prtFree = false;
95
96bool prtFree() {
97 return prtFree;
98} // prtFree
99
100bool prtFreeOn() {
101 bool temp = prtFree;
102 prtFree = true;
103 return temp;
104} // prtFreeOn
105
106bool prtFreeOff() {
107 bool temp = prtFree;
108 prtFree = false;
109 return temp;
110} // prtFreeOff
111
112
113//######################### Helpers #########################
114
115
116// generic Bsearchl does not inline, so substitute with hand-coded binary-search.
117inline __attribute__((always_inline))
118static size_t Bsearchl( unsigned int key, const unsigned int vals[], size_t dim ) {
119 size_t l = 0, m, h = dim;
120 while ( l < h ) {
121 m = (l + h) / 2;
122 if ( (unsigned int &)(vals[m]) < key ) { // cast away const
123 l = m + 1;
124 } else {
125 h = m;
126 } // if
127 } // while
128 return l;
129} // Bsearchl
130
131
132// pause to prevent excess processor bus usage
133#if defined( __i386 ) || defined( __x86_64 )
134 #define Pause() __asm__ __volatile__ ( "pause" : : : )
135#elif defined(__ARM_ARCH)
136 #define Pause() __asm__ __volatile__ ( "YIELD" : : : )
137#else
138 #error unsupported architecture
139#endif
140
141typedef volatile uintptr_t SpinLock_t;
142
143static inline __attribute__((always_inline)) void lock( volatile SpinLock_t & slock ) {
144 enum { SPIN_START = 4, SPIN_END = 64 * 1024, };
145 unsigned int spin = SPIN_START;
146
147 for ( unsigned int i = 1;; i += 1 ) {
148 if ( slock == 0 && __atomic_test_and_set( &slock, __ATOMIC_ACQUIRE ) == 0 ) break; // Fence
149 for ( volatile unsigned int s = 0; s < spin; s += 1 ) Pause(); // exponential spin
150 spin += spin; // powers of 2
151 //if ( i % 64 == 0 ) spin += spin; // slowly increase by powers of 2
152 if ( spin > SPIN_END ) spin = SPIN_END; // cap spinning
153 } // for
154} // spin_lock
155
156static inline __attribute__((always_inline)) void unlock( volatile SpinLock_t & slock ) {
157 __atomic_clear( &slock, __ATOMIC_RELEASE ); // Fence
158} // spin_unlock
159
160
161//####################### Heap Statistics ####################
162
163
164#ifdef __STATISTICS__
165enum { CntTriples = 12 }; // number of counter triples
166enum { MALLOC, AALLOC, CALLOC, MEMALIGN, AMEMALIGN, CMEMALIGN, RESIZE, REALLOC, FREE };
167
168struct StatsOverlay { // overlay for iteration
169 unsigned int calls, calls_0;
170 unsigned long long int request, alloc;
171};
172
173// Heap statistics counters.
174union HeapStatistics {
175 struct { // minimum qualification
176 unsigned int malloc_calls, malloc_0_calls;
177 unsigned long long int malloc_storage_request, malloc_storage_alloc;
178 unsigned int aalloc_calls, aalloc_0_calls;
179 unsigned long long int aalloc_storage_request, aalloc_storage_alloc;
180 unsigned int calloc_calls, calloc_0_calls;
181 unsigned long long int calloc_storage_request, calloc_storage_alloc;
182 unsigned int memalign_calls, memalign_0_calls;
183 unsigned long long int memalign_storage_request, memalign_storage_alloc;
184 unsigned int amemalign_calls, amemalign_0_calls;
185 unsigned long long int amemalign_storage_request, amemalign_storage_alloc;
186 unsigned int cmemalign_calls, cmemalign_0_calls;
187 unsigned long long int cmemalign_storage_request, cmemalign_storage_alloc;
188 unsigned int resize_calls, resize_0_calls;
189 unsigned long long int resize_storage_request, resize_storage_alloc;
190 unsigned int realloc_calls, realloc_0_calls;
191 unsigned long long int realloc_storage_request, realloc_storage_alloc;
192 unsigned int free_calls, free_null_calls;
193 unsigned long long int free_storage_request, free_storage_alloc;
194 unsigned int return_pulls, return_pushes;
195 unsigned long long int return_storage_request, return_storage_alloc;
196 unsigned int mmap_calls, mmap_0_calls; // no zero calls
197 unsigned long long int mmap_storage_request, mmap_storage_alloc;
198 unsigned int munmap_calls, munmap_0_calls; // no zero calls
199 unsigned long long int munmap_storage_request, munmap_storage_alloc;
200 };
201 struct StatsOverlay counters[CntTriples]; // overlay for iteration
202}; // HeapStatistics
203
204static_assert( sizeof(HeapStatistics) == CntTriples * sizeof(StatsOverlay),
205 "Heap statistics counter-triplets does not match with array size" );
206
207static void HeapStatisticsCtor( HeapStatistics & stats ) {
208 memset( &stats, '\0', sizeof(stats) ); // very fast
209 // for ( unsigned int i = 0; i < CntTriples; i += 1 ) {
210 // stats.counters[i].calls = stats.counters[i].calls_0 = stats.counters[i].request = stats.counters[i].alloc = 0;
211 // } // for
212} // HeapStatisticsCtor
213
214static HeapStatistics & ?+=?( HeapStatistics & lhs, const HeapStatistics & rhs ) {
215 for ( unsigned int i = 0; i < CntTriples; i += 1 ) {
216 lhs.counters[i].calls += rhs.counters[i].calls;
217 lhs.counters[i].calls_0 += rhs.counters[i].calls_0;
218 lhs.counters[i].request += rhs.counters[i].request;
219 lhs.counters[i].alloc += rhs.counters[i].alloc;
220 } // for
221 return lhs;
222} // ?+=?
223#endif // __STATISTICS__
224
225
226// Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage.
227// Break recursion by hardcoding number of buckets and statically checking number is correct after bucket array defined.
228enum { NoBucketSizes = 91 }; // number of buckets sizes
229
230struct Heap {
231 struct Storage {
232 struct Header { // header
233 union Kind {
234 struct RealHeader {
235 union {
236 struct { // 4-byte word => 8-byte header, 8-byte word => 16-byte header
237 union {
238 // 2nd low-order bit => zero filled, 3rd low-order bit => mmapped
239 // FreeHeader * home; // allocated block points back to home locations (must overlay alignment)
240 void * home; // allocated block points back to home locations (must overlay alignment)
241 size_t blockSize; // size for munmap (must overlay alignment)
242 Storage * next; // freed block points to next freed block of same size
243 };
244 size_t size; // allocation size in bytes
245 };
246 };
247 } real; // RealHeader
248
249 struct FakeHeader {
250 uintptr_t alignment; // 1st low-order bit => fake header & alignment
251 uintptr_t offset;
252 } fake; // FakeHeader
253 } kind; // Kind
254 } header; // Header
255
256 char pad[libAlign() - sizeof( Header )];
257 char data[0]; // storage
258 }; // Storage
259
260 static_assert( libAlign() >= sizeof( Storage ), "minimum alignment < sizeof( Storage )" );
261
262 struct CALIGN FreeHeader {
263 size_t blockSize CALIGN; // size of allocations on this list
264 #ifdef OWNERSHIP
265 #ifdef RETURNSPIN
266 SpinLock_t returnLock;
267 #endif // RETURNSPIN
268 Storage * returnList; // other thread return list
269 #endif // OWNERSHIP
270
271 Storage * freeList; // thread free list
272 Heap * homeManager; // heap owner (free storage to bucket, from bucket to heap)
273 }; // FreeHeader
274
275 FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes
276 void * heapBuffer; // start of free storage in buffer
277 size_t heapReserve; // amount of remaining free storage in buffer
278
279 #if defined( __STATISTICS__ ) || defined( __CFA_DEBUG__ )
280 Heap * nextHeapManager; // intrusive link of existing heaps; traversed to collect statistics or check unfreed storage
281 #endif // __STATISTICS__ || __CFA_DEBUG__
282 Heap * nextFreeHeapManager; // intrusive link of free heaps from terminated threads; reused by new threads
283
284 #ifdef __CFA_DEBUG__
285 ptrdiff_t allocUnfreed; // running total of allocations minus frees; can be negative
286 #endif // __CFA_DEBUG__
287
288 #ifdef __STATISTICS__
289 HeapStatistics stats; // local statistic table for this heap
290 #endif // __STATISTICS__
291}; // Heap
292
293
294struct HeapMaster {
295 SpinLock_t extLock; // protects allocation-buffer extension
296 SpinLock_t mgrLock; // protects freeHeapManagersList, heapManagersList, heapManagersStorage, heapManagersStorageEnd
297
298 void * heapBegin; // start of heap
299 void * heapEnd; // logical end of heap
300 size_t heapRemaining; // amount of storage not allocated in the current chunk
301 size_t pageSize; // architecture pagesize
302 size_t heapExpand; // sbrk advance
303 size_t mmapStart; // cross over point for mmap
304 unsigned int maxBucketsUsed; // maximum number of buckets in use
305
306 Heap * heapManagersList; // heap-list head
307 Heap * freeHeapManagersList; // free-list head
308
309 // Heap superblocks are not linked; heaps in superblocks are linked via intrusive links.
310 Heap * heapManagersStorage; // next heap to use in heap superblock
311 Heap * heapManagersStorageEnd; // logical heap outside of superblock's end
312
313 #ifdef __STATISTICS__
314 HeapStatistics stats; // global stats for thread-local heaps to add there counters when exiting
315 unsigned long int threads_started, threads_exited; // counts threads that have started and exited
316 unsigned long int reused_heap, new_heap; // counts reusability of heaps
317 unsigned int sbrk_calls;
318 unsigned long long int sbrk_storage;
319 int stats_fd;
320 #endif // __STATISTICS__
321}; // HeapMaster
322
323
324#ifdef FASTLOOKUP
325enum { LookupSizes = 65_536 + sizeof(Heap.Storage) }; // number of fast lookup sizes
326static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes
327#endif // FASTLOOKUP
328
329static volatile bool heapMasterBootFlag = false; // trigger for first heap
330static HeapMaster heapMaster @= {}; // program global
331
332static void heapMasterCtor();
333static void heapMasterDtor();
334static Heap * getHeap();
335
336
337// Size of array must harmonize with NoBucketSizes and individual bucket sizes must be multiple of 16.
338// Smaller multiples of 16 and powers of 2 are common allocation sizes, so make them generate the minimum required bucket size.
339// malloc(0) returns 0p, so no bucket is necessary for 0 bytes returning an address that can be freed.
340static const unsigned int bucketSizes[] @= { // different bucket sizes
341 16 + sizeof(Heap.Storage), 32 + sizeof(Heap.Storage), 48 + sizeof(Heap.Storage), 64 + sizeof(Heap.Storage), // 4
342 96 + sizeof(Heap.Storage), 112 + sizeof(Heap.Storage), 128 + sizeof(Heap.Storage), // 3
343 160, 192, 224, 256 + sizeof(Heap.Storage), // 4
344 320, 384, 448, 512 + sizeof(Heap.Storage), // 4
345 640, 768, 896, 1_024 + sizeof(Heap.Storage), // 4
346 1_536, 2_048 + sizeof(Heap.Storage), // 2
347 2_560, 3_072, 3_584, 4_096 + sizeof(Heap.Storage), // 4
348 6_144, 8_192 + sizeof(Heap.Storage), // 2
349 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 16_384 + sizeof(Heap.Storage), // 8
350 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 32_768 + sizeof(Heap.Storage), // 8
351 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 65_536 + sizeof(Heap.Storage), // 8
352 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 131_072 + sizeof(Heap.Storage), // 8
353 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 262_144 + sizeof(Heap.Storage), // 8
354 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 524_288 + sizeof(Heap.Storage), // 8
355 655_360, 786_432, 917_504, 1_048_576 + sizeof(Heap.Storage), // 4
356 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(Heap.Storage), // 8
357 2_621_440, 3_145_728, 3_670_016, 4_194_304 + sizeof(Heap.Storage), // 4
358};
359
360static_assert( NoBucketSizes == sizeof(bucketSizes) / sizeof(bucketSizes[0] ), "size of bucket array wrong" );
361
362
363// extern visibility, used by runtime kernel
364libcfa_public size_t __page_size; // architecture pagesize
365libcfa_public int __map_prot; // common mmap/mprotect protection
366
367
368// Thread-local storage is allocated lazily when the storage is accessed.
369static __thread size_t PAD1 CALIGN TLSMODEL __attribute__(( unused )); // protect false sharing
370static __thread Heap * heapManager CALIGN TLSMODEL;
371static __thread bool heapManagerBootFlag CALIGN TLSMODEL = false;
372static __thread size_t PAD2 CALIGN TLSMODEL __attribute__(( unused )); // protect further false sharing
373
374
375// declare helper functions for HeapMaster
376void noMemory(); // forward, called by "builtin_new" when malloc returns 0
377
378
379void heapMasterCtor() with( heapMaster ) {
380 // Singleton pattern to initialize heap master
381
382 verify( bucketSizes[0] == (16 + sizeof(Heap.Storage)) );
383
384 __page_size = sysconf( _SC_PAGESIZE );
385 __map_prot = PROT_READ | PROT_WRITE | PROT_EXEC;
386
387 extLock = 0;
388 mgrLock = 0;
389
390 char * end = (char *)sbrk( 0 );
391 heapBegin = heapEnd = sbrk( (char *)ceiling2( (long unsigned int)end, libAlign() ) - end ); // move start of heap to multiple of alignment
392 heapRemaining = 0;
393 heapExpand = malloc_expansion();
394 mmapStart = malloc_mmap_start();
395
396 // find the closest bucket size less than or equal to the mmapStart size
397 maxBucketsUsed = Bsearchl( mmapStart, bucketSizes, NoBucketSizes ); // binary search
398
399 verify( (mmapStart >= pageSize) && (bucketSizes[NoBucketSizes - 1] >= mmapStart) );
400 verify( maxBucketsUsed < NoBucketSizes ); // subscript failure ?
401 verify( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?
402
403 heapManagersList = 0p;
404 freeHeapManagersList = 0p;
405
406 heapManagersStorage = 0p;
407 heapManagersStorageEnd = 0p;
408
409 #ifdef __STATISTICS__
410 HeapStatisticsCtor( stats ); // clear statistic counters
411 threads_started = threads_exited = 0;
412 reused_heap = new_heap = 0;
413 sbrk_calls = sbrk_storage = 0;
414 stats_fd = STDERR_FILENO;
415 #endif // __STATISTICS__
416
417 #ifdef FASTLOOKUP
418 for ( unsigned int i = 0, idx = 0; i < LookupSizes; i += 1 ) {
419 if ( i > bucketSizes[idx] ) idx += 1;
420 lookup[i] = idx;
421 verify( i <= bucketSizes[idx] );
422 verify( (i <= 32 && idx == 0) || (i > bucketSizes[idx - 1]) );
423 } // for
424 #endif // FASTLOOKUP
425
426 heapMasterBootFlag = true;
427} // heapMasterCtor
428
429
430#define NO_MEMORY_MSG "**** Error **** insufficient heap memory available to allocate %zd new bytes."
431
432Heap * getHeap() with( heapMaster ) {
433 Heap * heap;
434 if ( freeHeapManagersList ) { // free heap for reused ?
435 heap = freeHeapManagersList;
436 freeHeapManagersList = heap->nextFreeHeapManager;
437
438 #ifdef __STATISTICS__
439 reused_heap += 1;
440 #endif // __STATISTICS__
441 } else { // free heap not found, create new
442 // Heap size is about 12K, FreeHeader (128 bytes because of cache alignment) * NoBucketSizes (91) => 128 heaps *
443 // 12K ~= 120K byte superblock. Where 128-heap superblock handles a medium sized multi-processor server.
444 size_t remaining = heapManagersStorageEnd - heapManagersStorage; // remaining free heaps in superblock
445 if ( ! heapManagersStorage || remaining == 0 ) {
446 // Each block of heaps is a multiple of the number of cores on the computer.
447 int HeapDim = get_nprocs(); // get_nprocs_conf does not work
448 size_t size = HeapDim * sizeof( Heap );
449
450 heapManagersStorage = (Heap *)mmap( 0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0 );
451 if ( unlikely( heapManagersStorage == (Heap *)MAP_FAILED ) ) { // failed ?
452 if ( errno == ENOMEM ) abort( NO_MEMORY_MSG, size ); // no memory
453 // Do not call strerror( errno ) as it may call malloc.
454 abort( "**** Error **** attempt to allocate block of heaps of size %zu bytes and mmap failed with errno %d.", size, errno );
455 } // if
456 heapManagersStorageEnd = &heapManagersStorage[HeapDim]; // outside array
457 } // if
458
459 heap = heapManagersStorage;
460 heapManagersStorage = heapManagersStorage + 1; // bump next heap
461
462 #if defined( __STATISTICS__ ) || defined( __CFA_DEBUG__ )
463 heap->nextHeapManager = heapManagersList;
464 #endif // __STATISTICS__ || __CFA_DEBUG__
465 heapManagersList = heap;
466
467 #ifdef __STATISTICS__
468 new_heap += 1;
469 #endif // __STATISTICS__
470
471 with( *heap ) {
472 for ( unsigned int j = 0; j < NoBucketSizes; j += 1 ) { // initialize free lists
473 #ifdef OWNERSHIP
474 #ifdef RETURNSPIN
475 freeLists[j].returnLock = 0;
476 freeLists[j].returnList = 0p;
477 #endif // RETURNSPIN
478 #endif // OWNERSHIP
479
480 freeLists[j].freeList = 0p;
481 freeLists[j].homeManager = heap;
482 freeLists[j].blockSize = bucketSizes[j];
483 } // for
484
485 heapBuffer = 0p;
486 heapReserve = 0;
487 nextFreeHeapManager = 0p;
488 #ifdef __CFA_DEBUG__
489 allocUnfreed = 0;
490 #endif // __CFA_DEBUG__
491 heapManagerBootFlag = true;
492 } // with
493 } // if
494
495 return heap;
496} // getHeap
497
498
499void heapManagerCtor() libcfa_public {
500 if ( unlikely( ! heapMasterBootFlag ) ) heapMasterCtor();
501
502 lock( heapMaster.mgrLock ); // protect heapMaster counters
503
504 assert( ! heapManagerBootFlag );
505
506 // get storage for heap manager
507
508 heapManager = getHeap();
509
510 #ifdef __STATISTICS__
511 HeapStatisticsCtor( heapManager->stats ); // heap local
512 heapMaster.threads_started += 1;
513 #endif // __STATISTICS__
514
515 unlock( heapMaster.mgrLock );
516} // heapManagerCtor
517
518
519void heapManagerDtor() libcfa_public {
520 if ( unlikely( ! heapManagerBootFlag ) ) return; // thread never used ?
521
522 lock( heapMaster.mgrLock );
523
524 // place heap on list of free heaps for reusability
525 heapManager->nextFreeHeapManager = heapMaster.freeHeapManagersList;
526 heapMaster.freeHeapManagersList = heapManager;
527
528 #ifdef __STATISTICS__
529 heapMaster.stats += heapManager->stats; // retain this heap's statistics
530 heapMaster.threads_exited += 1;
531 #endif // __STATISTICS__
532
533 // Do not set heapManager to NULL because it is used after Cforall is shutdown but before the program shuts down.
534
535 heapManagerBootFlag = false;
536 unlock( heapMaster.mgrLock );
537} // heapManagerDtor
538
539
540//####################### Memory Allocation Routines Helpers ####################
541
542
543extern int cfa_main_returned; // from interpose.cfa
544extern "C" {
545 void memory_startup( void ) { // singleton => called once at start of program
546 if ( ! heapMasterBootFlag ) heapManagerCtor(); // sanity check
547 } // memory_startup
548
549 void memory_shutdown( void ) {
550 heapManagerDtor();
551 } // memory_shutdown
552
553 void heapAppStart() { // called by __cfaabi_appready_startup
554 verify( heapManager );
555 #ifdef __CFA_DEBUG__
556 heapManager->allocUnfreed = 0; // clear prior allocation counts
557 #endif // __CFA_DEBUG__
558
559 #ifdef __STATISTICS__
560 HeapStatisticsCtor( heapManager->stats ); // clear prior statistic counters
561 #endif // __STATISTICS__
562 } // heapAppStart
563
564 void heapAppStop() { // called by __cfaabi_appready_startdown
565 fclose( stdin ); fclose( stdout ); // free buffer storage
566 if ( ! cfa_main_returned ) return; // do not check unfreed storage if exit called
567
568 #ifdef __STATISTICS__
569 if ( getenv( "CFA_MALLOC_STATS" ) ) { // check for external printing
570 malloc_stats();
571 } // if
572 #endif // __STATISTICS__
573
574 #ifdef __CFA_DEBUG__
575 // allocUnfreed is set to 0 when a heap is created and it accumulates any unfreed storage during its multiple thread
576 // usages. At the end, add up each heap allocUnfreed value across all heaps to get the total unfreed storage.
577 ptrdiff_t allocUnfreed = 0;
578 for ( Heap * heap = heapMaster.heapManagersList; heap; heap = heap->nextHeapManager ) {
579 allocUnfreed += heap->allocUnfreed;
580 } // for
581
582 allocUnfreed -= malloc_unfreed(); // subtract any user specified unfreed storage
583 if ( allocUnfreed > 0 ) {
584 // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
585 char helpText[512];
586 __cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText),
587 "CFA warning (UNIX pid:%ld) : program terminating with %td(%#tx) bytes of storage allocated but not freed.\n"
588 "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n",
589 (long int)getpid(), allocUnfreed, allocUnfreed ); // always print the UNIX pid
590 } // if
591 #endif // __CFA_DEBUG__
592 } // heapAppStop
593} // extern "C"
594
595
596#ifdef __STATISTICS__
597static HeapStatistics stats; // zero filled
598
599#define prtFmt \
600 "\nHeap statistics: (storage request / allocation)\n" \
601 " malloc >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
602 " aalloc >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
603 " calloc >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
604 " memalign >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
605 " amemalign >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
606 " cmemalign >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
607 " resize >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
608 " realloc >0 calls %'u; 0 calls %'u; storage %'llu / %'llu bytes\n" \
609 " free !null calls %'u; null calls %'u; storage %'llu / %'llu bytes\n" \
610 " return pulls %'u; pushes %'u; storage %'llu / %'llu bytes\n" \
611 " sbrk calls %'u; storage %'llu bytes\n" \
612 " mmap calls %'u; storage %'llu / %'llu bytes\n" \
613 " munmap calls %'u; storage %'llu / %'llu bytes\n" \
614 " threads started %'lu; exited %'lu\n" \
615 " heaps new %'lu; reused %'lu\n"
616
617// Use "write" because streams may be shutdown when calls are made.
618static int printStats( HeapStatistics & stats ) with( heapMaster, stats ) { // see malloc_stats
619 char helpText[sizeof(prtFmt) + 1024]; // space for message and values
620 return __cfaabi_bits_print_buffer( stats_fd, helpText, sizeof(helpText), prtFmt,
621 malloc_calls, malloc_0_calls, malloc_storage_request, malloc_storage_alloc,
622 aalloc_calls, aalloc_0_calls, aalloc_storage_request, aalloc_storage_alloc,
623 calloc_calls, calloc_0_calls, calloc_storage_request, calloc_storage_alloc,
624 memalign_calls, memalign_0_calls, memalign_storage_request, memalign_storage_alloc,
625 amemalign_calls, amemalign_0_calls, amemalign_storage_request, amemalign_storage_alloc,
626 cmemalign_calls, cmemalign_0_calls, cmemalign_storage_request, cmemalign_storage_alloc,
627 resize_calls, resize_0_calls, resize_storage_request, resize_storage_alloc,
628 realloc_calls, realloc_0_calls, realloc_storage_request, realloc_storage_alloc,
629 free_calls, free_null_calls, free_storage_request, free_storage_alloc,
630 return_pulls, return_pushes, return_storage_request, return_storage_alloc,
631 sbrk_calls, sbrk_storage,
632 mmap_calls, mmap_storage_request, mmap_storage_alloc,
633 munmap_calls, munmap_storage_request, munmap_storage_alloc,
634 threads_started, threads_exited,
635 new_heap, reused_heap
636 );
637} // printStats
638
639#define prtFmtXML \
640 "<malloc version=\"1\">\n" \
641 "<heap nr=\"0\">\n" \
642 "<sizes>\n" \
643 "</sizes>\n" \
644 "<total type=\"malloc\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
645 "<total type=\"aalloc\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
646 "<total type=\"calloc\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
647 "<total type=\"memalign\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
648 "<total type=\"amemalign\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
649 "<total type=\"cmemalign\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
650 "<total type=\"resize\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
651 "<total type=\"realloc\" >0 count=\"%'u;\" 0 count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
652 "<total type=\"free\" !null=\"%'u;\" 0 null=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
653 "<total type=\"return\" pulls=\"%'u;\" 0 pushes=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
654 "<total type=\"sbrk\" count=\"%'u;\" size=\"%'llu\"/> bytes\n" \
655 "<total type=\"mmap\" count=\"%'u;\" size=\"%'llu / %'llu\" / > bytes\n" \
656 "<total type=\"munmap\" count=\"%'u;\" size=\"%'llu / %'llu\"/> bytes\n" \
657 "<total type=\"threads\" started=\"%'lu;\" exited=\"%'lu\"/>\n" \
658 "<total type=\"heaps\" new=\"%'lu;\" reused=\"%'lu\"/>\n" \
659 "</malloc>"
660
661static int printStatsXML( HeapStatistics & stats, FILE * stream ) with( heapMaster, stats ) { // see malloc_info
662 char helpText[sizeof(prtFmtXML) + 1024]; // space for message and values
663 return __cfaabi_bits_print_buffer( fileno( stream ), helpText, sizeof(helpText), prtFmtXML,
664 malloc_calls, malloc_0_calls, malloc_storage_request, malloc_storage_alloc,
665 aalloc_calls, aalloc_0_calls, aalloc_storage_request, aalloc_storage_alloc,
666 calloc_calls, calloc_0_calls, calloc_storage_request, calloc_storage_alloc,
667 memalign_calls, memalign_0_calls, memalign_storage_request, memalign_storage_alloc,
668 amemalign_calls, amemalign_0_calls, amemalign_storage_request, amemalign_storage_alloc,
669 cmemalign_calls, cmemalign_0_calls, cmemalign_storage_request, cmemalign_storage_alloc,
670 resize_calls, resize_0_calls, resize_storage_request, resize_storage_alloc,
671 realloc_calls, realloc_0_calls, realloc_storage_request, realloc_storage_alloc,
672 free_calls, free_null_calls, free_storage_request, free_storage_alloc,
673 return_pulls, return_pushes, return_storage_request, return_storage_alloc,
674 sbrk_calls, sbrk_storage,
675 mmap_calls, mmap_storage_request, mmap_storage_alloc,
676 munmap_calls, munmap_storage_request, munmap_storage_alloc,
677 threads_started, threads_exited,
678 new_heap, reused_heap
679 );
680} // printStatsXML
681
682static HeapStatistics & collectStats( HeapStatistics & stats ) with( heapMaster ) {
683 lock( heapMaster.mgrLock );
684
685 stats += heapMaster.stats;
686 for ( Heap * heap = heapManagersList; heap; heap = heap->nextHeapManager ) {
687 stats += heap->stats;
688 } // for
689
690 unlock( heapMaster.mgrLock );
691 return stats;
692} // collectStats
693
694static inline void clearStats() {
695 lock( heapMaster.mgrLock );
696
697 // Zero the heap master and all active thread heaps.
698 HeapStatisticsCtor( heapMaster.stats );
699 for ( Heap * heap = heapMaster.heapManagersList; heap; heap = heap->nextHeapManager ) {
700 HeapStatisticsCtor( heap->stats );
701 } // for
702
703 unlock( heapMaster.mgrLock );
704} // clearStats
705#endif // __STATISTICS__
706
707
708static bool setMmapStart( size_t value ) with( heapMaster ) { // true => mmapped, false => sbrk
709 if ( value < __page_size || bucketSizes[NoBucketSizes - 1] < value ) return false;
710 mmapStart = value; // set global
711
712 // find the closest bucket size less than or equal to the mmapStart size
713 maxBucketsUsed = Bsearchl( mmapStart, bucketSizes, NoBucketSizes ); // binary search
714
715 verify( maxBucketsUsed < NoBucketSizes ); // subscript failure ?
716 verify( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?
717 return true;
718} // setMmapStart
719
720
721// <-------+----------------------------------------------------> bsize (bucket size)
722// |header |addr
723//==================================================================================
724// align/offset |
725// <-----------------<------------+-----------------------------> bsize (bucket size)
726// |fake-header | addr
727#define HeaderAddr( addr ) ((Heap.Storage.Header *)( (char *)addr - sizeof(Heap.Storage) ))
728#define RealHeader( header ) ((Heap.Storage.Header *)((char *)header - header->kind.fake.offset))
729
730// <-------<<--------------------- dsize ---------------------->> bsize (bucket size)
731// |header |addr
732//==================================================================================
733// align/offset |
734// <------------------------------<<---------- dsize --------->>> bsize (bucket size)
735// |fake-header |addr
736#define DataStorage( bsize, addr, header ) (bsize - ( (char *)addr - (char *)header ))
737
738
739inline __attribute__((always_inline))
740static void checkAlign( size_t alignment ) {
741 if ( unlikely( alignment < libAlign() || ! is_pow2( alignment ) ) ) {
742 abort( "**** Error **** alignment %zu for memory allocation is less than %d and/or not a power of 2.", alignment, libAlign() );
743 } // if
744} // checkAlign
745
746
747inline __attribute__((always_inline))
748static void checkHeader( bool check, const char name[], void * addr ) {
749 if ( unlikely( check ) ) { // bad address ?
750 abort( "**** Error **** attempt to %s storage %p with address outside the heap.\n"
751 "Possible cause is duplicate free on same block or overwriting of memory.",
752 name, addr );
753 } // if
754} // checkHeader
755
756
757// Manipulate sticky bits stored in unused 3 low-order bits of an address.
758// bit0 => alignment => fake header
759// bit1 => zero filled (calloc)
760// bit2 => mapped allocation versus sbrk
761#define StickyBits( header ) (((header)->kind.real.blockSize & 0x7))
762#define ClearStickyBits( addr ) (typeof(addr))((uintptr_t)(addr) & ~7)
763#define MarkAlignmentBit( align ) ((align) | 1)
764#define AlignmentBit( header ) ((((header)->kind.fake.alignment) & 1))
765#define ClearAlignmentBit( header ) (((header)->kind.fake.alignment) & ~1)
766#define ZeroFillBit( header ) ((((header)->kind.real.blockSize) & 2))
767#define ClearZeroFillBit( header ) ((((header)->kind.real.blockSize) &= ~2))
768#define MarkZeroFilledBit( header ) ((header)->kind.real.blockSize |= 2)
769#define MmappedBit( header ) ((((header)->kind.real.blockSize) & 4))
770#define MarkMmappedBit( size ) ((size) | 4)
771
772
773inline __attribute__((always_inline))
774static void fakeHeader( Heap.Storage.Header *& header, size_t & alignment ) {
775 if ( unlikely( AlignmentBit( header ) ) ) { // fake header ?
776 alignment = ClearAlignmentBit( header ); // clear flag from value
777 #ifdef __CFA_DEBUG__
778 checkAlign( alignment ); // check alignment
779 #endif // __CFA_DEBUG__
780 header = RealHeader( header ); // backup from fake to real header
781 } else {
782 alignment = libAlign(); // => no fake header
783 } // if
784} // fakeHeader
785
786
787inline __attribute__((always_inline))
788static bool headers( const char name[] __attribute__(( unused )), void * addr, Heap.Storage.Header *& header,
789 Heap.FreeHeader *& freeHead, size_t & size, size_t & alignment ) with( heapMaster, *heapManager ) {
790 header = HeaderAddr( addr );
791
792 #ifdef __CFA_DEBUG__
793 checkHeader( header < (Heap.Storage.Header *)heapBegin, name, addr ); // bad low address ?
794 #endif // __CFA_DEBUG__
795
796 if ( likely( ! StickyBits( header ) ) ) { // no sticky bits ?
797 freeHead = (Heap.FreeHeader *)(header->kind.real.home);
798 alignment = libAlign();
799 } else {
800 fakeHeader( header, alignment );
801 if ( unlikely( MmappedBit( header ) ) ) { // mmapped ?
802 verify( addr < heapBegin || heapEnd < addr );
803 size = ClearStickyBits( header->kind.real.blockSize ); // mmap size
804 return true;
805 } // if
806
807 freeHead = (Heap.FreeHeader *)(ClearStickyBits( header->kind.real.home ));
808 } // if
809 size = freeHead->blockSize;
810
811 #ifdef __CFA_DEBUG__
812 checkHeader( header < (Heap.Storage.Header *)heapBegin || (Heap.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -)
813
814 Heap * homeManager;
815 if ( unlikely( freeHead == 0p || // freed and only free-list node => null link
816 // freed and link points at another free block not to a bucket in the bucket array.
817 (homeManager = freeHead->homeManager, freeHead < &homeManager->freeLists[0] ||
818 &homeManager->freeLists[NoBucketSizes] <= freeHead ) ) ) {
819 abort( "**** Error **** attempt to %s storage %p with corrupted header.\n"
820 "Possible cause is duplicate free on same block or overwriting of header information.",
821 name, addr );
822 } // if
823 #endif // __CFA_DEBUG__
824
825 return false;
826} // headers
827
828
829static void * master_extend( size_t size ) with( heapMaster ) {
830 lock( extLock );
831
832 ptrdiff_t rem = heapRemaining - size;
833 if ( unlikely( rem < 0 ) ) { // negative ?
834 // If the size requested is bigger than the current remaining storage, increase the size of the heap.
835
836 size_t increase = ceiling2( size > heapExpand ? size : heapExpand, libAlign() );
837 if ( unlikely( sbrk( increase ) == (void *)-1 ) ) { // failed, no memory ?
838 unlock( extLock );
839 abort( NO_MEMORY_MSG, size ); // give up
840 } // if
841
842 // Make storage executable for thunks.
843 if ( mprotect( (char *)heapEnd + heapRemaining, increase, __map_prot ) ) {
844 unlock( extLock );
845 abort( "**** Error **** attempt to make heap storage executable for thunks and mprotect failed with errno %d.", errno );
846 } // if
847
848 rem = heapRemaining + increase - size;
849
850 #ifdef __STATISTICS__
851 sbrk_calls += 1;
852 sbrk_storage += increase;
853 #endif // __STATISTICS__
854 } // if
855
856 Heap.Storage * block = (Heap.Storage *)heapEnd;
857 heapRemaining = rem;
858 heapEnd = (char *)heapEnd + size;
859
860 unlock( extLock );
861 return block;
862} // master_extend
863
864
865__attribute__(( noinline ))
866static void * manager_extend( size_t size ) with( *heapManager ) {
867 ptrdiff_t rem = heapReserve - size;
868
869 if ( unlikely( rem < 0 ) ) { // negative ?
870 // If the size requested is bigger than the current remaining reserve, use the current reserve to populate
871 // smaller freeLists, and increase the reserve.
872
873 rem = heapReserve; // positive
874
875 if ( (unsigned int)rem >= bucketSizes[0] ) { // minimal size ? otherwise ignore
876 size_t bucket;
877 #ifdef FASTLOOKUP
878 if ( likely( rem < LookupSizes ) ) bucket = lookup[rem];
879 #endif // FASTLOOKUP
880 bucket = Bsearchl( rem, bucketSizes, heapMaster.maxBucketsUsed );
881 verify( 0 <= bucket && bucket <= heapMaster.maxBucketsUsed );
882 Heap.FreeHeader * freeHead = &(freeLists[bucket]);
883
884 // The remaining storage may not be bucket size, whereas all other allocations are. Round down to previous
885 // bucket size in this case.
886 if ( unlikely( freeHead->blockSize > (size_t)rem ) ) freeHead -= 1;
887 Heap.Storage * block = (Heap.Storage *)heapBuffer;
888
889 block->header.kind.real.next = freeHead->freeList; // push on stack
890 freeHead->freeList = block;
891 } // if
892
893 size_t increase = ceiling( size > ( heapMaster.heapExpand / 10 ) ? size : ( heapMaster.heapExpand / 10 ), libAlign() );
894 heapBuffer = master_extend( increase );
895 rem = increase - size;
896 } // if
897
898 Heap.Storage * block = (Heap.Storage *)heapBuffer;
899 heapReserve = rem;
900 heapBuffer = (char *)heapBuffer + size;
901
902 return block;
903} // manager_extend
904
905
906#define BOOT_HEAP_MANAGER \
907 if ( unlikely( ! heapMasterBootFlag ) ) { \
908 heapManagerCtor(); /* trigger for first heap */ \
909 } /* if */
910
911#ifdef __STATISTICS__
912#define STAT_NAME __counter
913#define STAT_PARM , unsigned int STAT_NAME
914#define STAT_ARG( name ) , name
915#define STAT_0_CNT( counter ) stats.counters[counter].calls_0 += 1
916#else
917#define STAT_NAME
918#define STAT_PARM
919#define STAT_ARG( name )
920#define STAT_0_CNT( counter )
921#endif // __STATISTICS__
922
923// Uncomment to get allocation addresses for a 0-sized allocation rather than a null pointer.
924//#define __NONNULL_0_ALLOC__
925#if ! defined( __NONNULL_0_ALLOC__ )
926#define __NULL_0_ALLOC__ unlikely( size == 0 ) || /* 0 BYTE ALLOCATION RETURNS NULL POINTER */
927#else
928#define __NULL_0_ALLOC__
929#endif // __NONNULL_0_ALLOC__
930
931#define PROLOG( counter, ... ) \
932 BOOT_HEAP_MANAGER; \
933 if ( \
934 __NULL_0_ALLOC__ \
935 unlikely( size > ULONG_MAX - sizeof(Heap.Storage) ) ) { /* error check */ \
936 STAT_0_CNT( counter ); \
937 __VA_ARGS__; \
938 return 0p; \
939 } /* if */
940
941
942#define SCRUB_SIZE 1024lu
943// Do not use '\xfe' for scrubbing because dereferencing an address composed of it causes a SIGSEGV *without* a valid IP
944// pointer in the interrupt frame.
945#define SCRUB '\xff'
946
947static void * doMalloc( size_t size STAT_PARM ) libcfa_nopreempt with( *heapManager ) {
948 PROLOG( STAT_NAME );
949
950 verify( heapManager );
951 Heap.Storage * block; // pointer to new block of storage
952
953 // Look up size in the size list. Make sure the user request includes space for the header that must be allocated
954 // along with the block and is a multiple of the alignment size.
955 size_t tsize = size + sizeof(Heap.Storage);
956
957 #ifdef __STATISTICS__
958 stats.counters[STAT_NAME].calls += 1;
959 stats.counters[STAT_NAME].request += size;
960 #endif // __STATISTICS__
961
962 #ifdef __CFA_DEBUG__
963 allocUnfreed += size;
964 #endif // __CFA_DEBUG__
965
966 if ( likely( tsize < heapMaster.mmapStart ) ) { // small size => sbrk
967 size_t bucket;
968 #ifdef FASTLOOKUP
969 if ( likely( tsize < LookupSizes ) ) bucket = lookup[tsize];
970 else
971 #endif // FASTLOOKUP
972 bucket = Bsearchl( tsize, bucketSizes, heapMaster.maxBucketsUsed );
973 verify( 0 <= bucket && bucket <= heapMaster.maxBucketsUsed );
974 Heap.FreeHeader * freeHead = &freeLists[bucket];
975
976 verify( freeHead <= &freeLists[heapMaster.maxBucketsUsed] ); // subscripting error ?
977 verify( tsize <= freeHead->blockSize ); // search failure ?
978
979 tsize = freeHead->blockSize; // total space needed for request
980 #ifdef __STATISTICS__
981 stats.counters[STAT_NAME].alloc += tsize;
982 #endif // __STATISTICS__
983
984 block = freeHead->freeList; // remove node from stack
985 if ( unlikely( block == 0p ) ) { // no free block ?
986 // Freelist for this size is empty, so check return list (OWNERSHIP), or carve it out of the heap if there
987 // is enough left, or get some more heap storage and carve it off.
988 #ifdef OWNERSHIP
989 if ( unlikely( freeHead->returnList ) ) { // race, get next time if lose race
990 #ifdef RETURNSPIN
991 lock( freeHead->returnLock );
992 block = freeHead->returnList;
993 freeHead->returnList = 0p;
994 unlock( freeHead->returnLock );
995 #else
996 block = __atomic_exchange_n( &freeHead->returnList, 0p, __ATOMIC_SEQ_CST );
997 #endif // RETURNSPIN
998
999 verify( block );
1000 #ifdef __STATISTICS__
1001 stats.return_pulls += 1;
1002 #endif // __STATISTICS__
1003
1004 // OK TO BE PREEMPTED HERE AS heapManager IS NO LONGER ACCESSED.
1005
1006 freeHead->freeList = block->header.kind.real.next; // merge returnList into freeHead
1007 } else {
1008 #endif // OWNERSHIP
1009 // Do not leave kernel thread as manager_extend accesses heapManager.
1010 disable_interrupts();
1011 block = (Heap.Storage *)manager_extend( tsize ); // mutual exclusion on call
1012 enable_interrupts( false );
1013
1014 // OK TO BE PREEMPTED HERE AS heapManager IS NO LONGER ACCESSED.
1015
1016 #ifdef __CFA_DEBUG__
1017 // Scrub new memory so subsequent uninitialized usages might fail. Only scrub the first SCRUB_SIZE bytes.
1018 memset( block->data, SCRUB, min( SCRUB_SIZE, tsize - sizeof(Heap.Storage) ) );
1019 #endif // __CFA_DEBUG__
1020 #ifdef OWNERSHIP
1021 } // if
1022 #endif // OWNERSHIP
1023 } else {
1024 // Memory is scrubbed in doFree.
1025 freeHead->freeList = block->header.kind.real.next;
1026 } // if
1027
1028 block->header.kind.real.home = freeHead; // pointer back to free list of apropriate size
1029 } else { // large size => mmap
1030 if ( unlikely( size > ULONG_MAX - __page_size ) ) return 0p;
1031 tsize = ceiling2( tsize, __page_size ); // must be multiple of page size
1032
1033 #ifdef __STATISTICS__
1034 stats.counters[STAT_NAME].alloc += tsize;
1035 stats.mmap_calls += 1;
1036 stats.mmap_storage_request += size;
1037 stats.mmap_storage_alloc += tsize;
1038 #endif // __STATISTICS__
1039
1040 disable_interrupts();
1041 block = (Heap.Storage *)mmap( 0, tsize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0 );
1042 enable_interrupts( false );
1043
1044 // OK TO BE PREEMPTED HERE AS heapManager IS NO LONGER ACCESSED.
1045
1046 if ( unlikely( block == (Heap.Storage *)MAP_FAILED ) ) { // failed ?
1047 if ( errno == ENOMEM ) abort( NO_MEMORY_MSG, tsize ); // no memory
1048 // Do not call strerror( errno ) as it may call malloc.
1049 abort( "**** Error **** attempt to allocate large object (> %zu) of size %zu bytes and mmap failed with errno %d.",
1050 size, heapMaster.mmapStart, errno );
1051 } // if
1052 block->header.kind.real.blockSize = MarkMmappedBit( tsize ); // storage size for munmap
1053
1054 #ifdef __CFA_DEBUG__
1055 // Scrub new memory so subsequent uninitialized usages might fail. Only scrub the first SCRUB_SIZE bytes. The
1056 // rest of the storage set to 0 by mmap.
1057 memset( block->data, SCRUB, min( SCRUB_SIZE, tsize - sizeof(Heap.Storage) ) );
1058 #endif // __CFA_DEBUG__
1059 } // if
1060
1061 block->header.kind.real.size = size; // store allocation size
1062 void * addr = &(block->data); // adjust off header to user bytes
1063 verify( ((uintptr_t)addr & (libAlign() - 1)) == 0 ); // minimum alignment ?
1064
1065 #ifdef __CFA_DEBUG__
1066 if ( traceHeap() ) {
1067 char helpText[64];
1068 __cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText),
1069 "%p = Malloc( %zu ) (allocated %zu)\n", addr, size, tsize ); // print debug/nodebug
1070 } // if
1071 #endif // __CFA_DEBUG__
1072
1073// poll_interrupts(); // call rollforward
1074
1075 return addr;
1076} // doMalloc
1077
1078
1079static void doFree( void * addr ) libcfa_nopreempt with( *heapManager ) {
1080 verify( addr );
1081
1082 // detect free after thread-local storage destruction and use global stats in that case
1083
1084 Heap.Storage.Header * header;
1085 Heap.FreeHeader * freeHead;
1086 size_t size, alignment;
1087
1088 bool mapped = headers( "free", addr, header, freeHead, size, alignment );
1089 #if defined( __STATISTICS__ ) || defined( __CFA_DEBUG__ )
1090 size_t rsize = header->kind.real.size; // optimization
1091 #endif // __STATISTICS__ || __CFA_DEBUG__
1092
1093 #ifdef __STATISTICS__
1094 stats.free_storage_request += rsize;
1095 stats.free_storage_alloc += size;
1096 #endif // __STATISTICS__
1097
1098 #ifdef __CFA_DEBUG__
1099 allocUnfreed -= rsize;
1100 #endif // __CFA_DEBUG__
1101
1102 if ( unlikely( mapped ) ) { // mmapped ?
1103 #ifdef __STATISTICS__
1104 stats.munmap_calls += 1;
1105 stats.munmap_storage_request += rsize;
1106 stats.munmap_storage_alloc += size;
1107 #endif // __STATISTICS__
1108
1109 // OK TO BE PREEMPTED HERE AS heapManager IS NO LONGER ACCESSED.
1110
1111 // Does not matter where this storage is freed.
1112 if ( unlikely( munmap( header, size ) == -1 ) ) {
1113 // Do not call strerror( errno ) as it may call malloc.
1114 abort( "**** Error **** attempt to deallocate large object %p and munmap failed with errno %d.\n"
1115 "Possible cause is invalid delete pointer: either not allocated or with corrupt header.",
1116 addr, errno );
1117 } // if
1118 } else {
1119 #ifdef __CFA_DEBUG__
1120 // memset is NOT always inlined!
1121 disable_interrupts();
1122 // Scrub old memory so subsequent usages might fail. Only scrub the first/last SCRUB_SIZE bytes.
1123 char * data = ((Heap.Storage *)header)->data; // data address
1124 size_t dsize = size - sizeof(Heap.Storage); // data size
1125 if ( dsize <= SCRUB_SIZE * 2 ) {
1126 memset( data, SCRUB, dsize ); // scrub all
1127 } else {
1128 memset( data, SCRUB, SCRUB_SIZE ); // scrub front
1129 memset( data + dsize - SCRUB_SIZE, SCRUB, SCRUB_SIZE ); // scrub back
1130 } // if
1131 enable_interrupts( false );
1132 #endif // __CFA_DEBUG__
1133
1134 #ifdef OWNERSHIP
1135 if ( likely( heapManager == freeHead->homeManager ) ) { // belongs to this thread
1136 header->kind.real.next = freeHead->freeList; // push on stack
1137 freeHead->freeList = (Heap.Storage *)header;
1138 } else { // return to thread owner
1139 verify( heapManager );
1140
1141 #ifdef RETURNSPIN
1142 lock( freeHead->returnLock );
1143 header->kind.real.next = freeHead->returnList; // push to bucket return list
1144 freeHead->returnList = (Heap.Storage *)header;
1145 unlock( freeHead->returnLock );
1146 #else // lock free
1147 header->kind.real.next = freeHead->returnList; // link new node to top node
1148 // CAS resets header->kind.real.next = freeHead->returnList on failure
1149 while ( ! __atomic_compare_exchange_n( &freeHead->returnList, &header->kind.real.next, (Heap.Storage *)header,
1150 false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST ) );
1151
1152 #ifdef __STATISTICS__
1153 stats.return_pushes += 1;
1154 stats.return_storage_request += rsize;
1155 stats.return_storage_alloc += size;
1156 #endif // __STATISTICS__
1157 #endif // RETURNSPIN
1158 } // if
1159
1160 #else // no OWNERSHIP
1161
1162 // kind.real.home is address in owner thread's freeLists, so compute the equivalent position in this thread's freeList.
1163 freeHead = &freeLists[ClearStickyBits( (Heap.FreeHeader *)(header->kind.real.home) ) - &freeHead->homeManager->freeLists[0]];
1164 header->kind.real.next = freeHead->freeList; // push on stack
1165 freeHead->freeList = (Heap.Storage *)header;
1166 #endif // ! OWNERSHIP
1167
1168 // OK TO BE PREEMPTED HERE AS heapManager IS NO LONGER ACCESSED.
1169 } // if
1170
1171 #ifdef __CFA_DEBUG__
1172 if ( traceHeap() ) {
1173 char helpText[64];
1174 __cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText),
1175 "Free( %p ) size:%zu\n", addr, size ); // print debug/nodebug
1176 } // if
1177 #endif // __CFA_DEBUG__
1178
1179// poll_interrupts(); // call rollforward
1180} // doFree
1181
1182
1183size_t prtFree( Heap & manager ) with( manager ) {
1184 size_t total = 0;
1185 #ifdef __STATISTICS__
1186 __cfaabi_bits_acquire();
1187 __cfaabi_bits_print_nolock( STDERR_FILENO, "\nBin lists (bin size : free blocks on list)\n" );
1188 #endif // __STATISTICS__
1189 for ( unsigned int i = 0; i < heapMaster.maxBucketsUsed; i += 1 ) {
1190 size_t size = freeLists[i].blockSize;
1191 #ifdef __STATISTICS__
1192 unsigned int N = 0;
1193 #endif // __STATISTICS__
1194
1195 for ( Heap.Storage * p = freeLists[i].freeList; p != 0p; p = p->header.kind.real.next ) {
1196 total += size;
1197 #ifdef __STATISTICS__
1198 N += 1;
1199 #endif // __STATISTICS__
1200 } // for
1201
1202 #ifdef __STATISTICS__
1203 __cfaabi_bits_print_nolock( STDERR_FILENO, "%7zu, %-7u ", size, N );
1204 if ( (i + 1) % 8 == 0 ) __cfaabi_bits_print_nolock( STDERR_FILENO, "\n" );
1205 #endif // __STATISTICS__
1206 } // for
1207 #ifdef __STATISTICS__
1208 __cfaabi_bits_print_nolock( STDERR_FILENO, "\ntotal free blocks:%zu\n", total );
1209 __cfaabi_bits_release();
1210 #endif // __STATISTICS__
1211 return (char *)heapMaster.heapEnd - (char *)heapMaster.heapBegin - total;
1212} // prtFree
1213
1214
1215#ifdef __STATISTICS__
1216static void incCalls( size_t statName ) libcfa_nopreempt {
1217 heapManager->stats.counters[statName].calls += 1;
1218} // incCalls
1219
1220static void incZeroCalls( size_t statName ) libcfa_nopreempt {
1221 heapManager->stats.counters[statName].calls_0 += 1;
1222} // incZeroCalls
1223#endif // __STATISTICS__
1224
1225#ifdef __CFA_DEBUG__
1226static void incUnfreed( intptr_t offset ) libcfa_nopreempt {
1227 heapManager->allocUnfreed += offset;
1228} // incUnfreed
1229#endif // __CFA_DEBUG__
1230
1231
1232static void * memalignNoStats( size_t alignment, size_t size STAT_PARM ) {
1233 checkAlign( alignment ); // check alignment
1234
1235 // if alignment <= default alignment or size == 0, do normal malloc as two headers are unnecessary
1236 if ( unlikely( alignment <= libAlign() || size == 0 ) ) return doMalloc( size STAT_ARG( STAT_NAME ) );
1237
1238 // Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for
1239 // administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC.
1240 // .-------------v-----------------v----------------v----------,
1241 // | Real Header | ... padding ... | Fake Header | data ... |
1242 // `-------------^-----------------^-+--------------^----------'
1243 // |<--------------------------------' offset/align |<-- alignment boundary
1244
1245 // subtract libAlign() because it is already the minimum alignment
1246 // add sizeof(Storage) for fake header
1247 size_t offset = alignment - libAlign() + sizeof(Heap.Storage);
1248 char * addr = (char *)doMalloc( size + offset STAT_ARG( STAT_NAME ) );
1249
1250 // address in the block of the "next" alignment address
1251 char * user = (char *)ceiling2( (uintptr_t)(addr + sizeof(Heap.Storage)), alignment );
1252
1253 // address of header from malloc
1254 Heap.Storage.Header * realHeader = HeaderAddr( addr );
1255 realHeader->kind.real.size = size; // correct size to eliminate above alignment offset
1256 #ifdef __CFA_DEBUG__
1257 incUnfreed( -offset ); // adjustment off the offset from call to doMalloc
1258 #endif // __CFA_DEBUG__
1259
1260 // address of fake header *before* the alignment location
1261 Heap.Storage.Header * fakeHeader = HeaderAddr( user );
1262
1263 // SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment
1264 fakeHeader->kind.fake.offset = (char *)fakeHeader - (char *)realHeader;
1265 // SKULLDUGGERY: odd alignment implies fake header
1266 fakeHeader->kind.fake.alignment = MarkAlignmentBit( alignment );
1267
1268 return user;
1269} // memalignNoStats
1270
1271
1272//####################### Memory Allocation Routines ####################
1273
1274
1275extern "C" {
1276 // Allocates size bytes and returns a pointer to the allocated memory. The contents are undefined. If size is 0,
1277 // then malloc() returns a unique pointer value that can later be successfully passed to free().
1278 void * malloc( size_t size ) libcfa_public {
1279 return doMalloc( size STAT_ARG( MALLOC ) );
1280 } // malloc
1281
1282
1283 // Same as malloc() except size bytes is an array of dim elements each of elemSize bytes.
1284 void * aalloc( size_t dim, size_t elemSize ) libcfa_public {
1285 return doMalloc( dim * elemSize STAT_ARG( AALLOC ) );
1286 } // aalloc
1287
1288
1289 // Same as aalloc() with memory set to zero.
1290 void * calloc( size_t dim, size_t elemSize ) libcfa_public {
1291 size_t size = dim * elemSize;
1292 char * addr = (char *)doMalloc( size STAT_ARG( CALLOC ) );
1293
1294 if ( unlikely( addr == NULL ) ) return NULL; // stop further processing if 0p is returned
1295
1296 Heap.Storage.Header * header;
1297 Heap.FreeHeader * freeHead;
1298 size_t bsize, alignment;
1299
1300 #ifndef __CFA_DEBUG__
1301 bool mapped =
1302 #endif // __CFA_DEBUG__
1303 headers( "calloc", addr, header, freeHead, bsize, alignment );
1304
1305 #ifndef __CFA_DEBUG__
1306 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
1307 if ( likely( ! mapped ) )
1308 #endif // __CFA_DEBUG__
1309 // <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined
1310 // `-header`-addr `-size
1311 memset( addr, '\0', size ); // set to zeros
1312
1313 MarkZeroFilledBit( header ); // mark as zero fill
1314 return addr;
1315 } // calloc
1316
1317
1318 // Change the size of the memory block pointed to by oaddr to size bytes. The contents are undefined. If oaddr is
1319 // 0p, then the call is equivalent to malloc(size), for all values of size; if size is equal to zero, and oaddr is
1320 // not 0p, then the call is equivalent to free(oaddr). Unless oaddr is 0p, it must have been returned by an earlier
1321 // call to malloc(), alloc(), calloc() or realloc(). If the area pointed to was moved, a free(oaddr) is done.
1322 void * resize( void * oaddr, size_t size ) libcfa_public {
1323 if ( unlikely( oaddr == 0p ) ) { // => malloc( size )
1324 return doMalloc( size STAT_ARG( RESIZE ) );
1325 } // if
1326
1327 PROLOG( RESIZE, doFree( oaddr ) ); // => free( oaddr )
1328
1329 Heap.Storage.Header * header;
1330 Heap.FreeHeader * freeHead;
1331 size_t bsize, oalign;
1332 headers( "resize", oaddr, header, freeHead, bsize, oalign );
1333
1334 size_t odsize = DataStorage( bsize, oaddr, header ); // data storage available in bucket
1335 // same size, DO NOT preserve STICKY PROPERTIES.
1336 if ( oalign == libAlign() && size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size
1337 ClearZeroFillBit( header ); // no alignment and turn off 0 fill
1338 #ifdef __CFA_DEBUG__
1339 incUnfreed( size - header->kind.real.size ); // adjustment off the size difference
1340 #endif // __CFA_DEBUG__
1341 header->kind.real.size = size; // reset allocation size
1342 #ifdef __STATISTICS__
1343 incCalls( RESIZE );
1344 #endif // __STATISTICS__
1345 return oaddr;
1346 } // if
1347
1348 // change size, DO NOT preserve STICKY PROPERTIES.
1349 doFree( oaddr ); // free previous storage
1350
1351 return doMalloc( size STAT_ARG( RESIZE ) ); // create new area
1352 } // resize
1353
1354
1355 // Same as resize() but the contents are unchanged in the range from the start of the region up to the minimum of
1356 // the old and new sizes.
1357 void * realloc( void * oaddr, size_t size ) libcfa_public {
1358 if ( unlikely( oaddr == 0p ) ) { // => malloc( size )
1359 return doMalloc( size STAT_ARG( REALLOC ) );
1360 } // if
1361
1362 PROLOG( REALLOC, doFree( oaddr ) ); // => free( oaddr )
1363
1364 Heap.Storage.Header * header;
1365 Heap.FreeHeader * freeHead;
1366 size_t bsize, oalign;
1367 headers( "realloc", oaddr, header, freeHead, bsize, oalign );
1368
1369 size_t odsize = DataStorage( bsize, oaddr, header ); // data storage available in bucket
1370 size_t osize = header->kind.real.size; // old allocation size
1371 bool ozfill = ZeroFillBit( header ); // old allocation zero filled
1372 if ( unlikely( size <= odsize ) && odsize <= size * 2 ) { // allow up to 50% wasted storage
1373 #ifdef __CFA_DEBUG__
1374 incUnfreed( size - header->kind.real.size ); // adjustment off the size difference
1375 #endif // __CFA_DEBUG__
1376 header->kind.real.size = size; // reset allocation size
1377 if ( unlikely( ozfill ) && size > osize ) { // previous request zero fill and larger ?
1378 memset( (char *)oaddr + osize, '\0', size - osize ); // initialize added storage
1379 } // if
1380 #ifdef __STATISTICS__
1381 incCalls( REALLOC );
1382 #endif // __STATISTICS__
1383 return oaddr;
1384 } // if
1385
1386 // change size and copy old content to new storage
1387
1388 void * naddr;
1389 if ( likely( oalign <= libAlign() ) ) { // previous request not aligned ?
1390 naddr = doMalloc( size STAT_ARG( REALLOC ) ); // create new area
1391 } else {
1392 naddr = memalignNoStats( oalign, size STAT_ARG( REALLOC ) ); // create new aligned area
1393 } // if
1394
1395 headers( "realloc", naddr, header, freeHead, bsize, oalign );
1396 // To preserve prior fill, the entire bucket must be copied versus the size.
1397 memcpy( naddr, oaddr, min( osize, size ) ); // copy bytes
1398 doFree( oaddr ); // free previous storage
1399
1400 if ( unlikely( ozfill ) ) { // previous request zero fill ?
1401 MarkZeroFilledBit( header ); // mark new request as zero filled
1402 if ( size > osize ) { // previous request larger ?
1403 memset( (char *)naddr + osize, '\0', size - osize ); // initialize added storage
1404 } // if
1405 } // if
1406 return naddr;
1407 } // realloc
1408
1409
1410 // Same as realloc() except the new allocation size is large enough for an array of nelem elements of size elsize.
1411 void * reallocarray( void * oaddr, size_t dim, size_t elemSize ) libcfa_public {
1412 return realloc( oaddr, dim * elemSize );
1413 } // reallocarray
1414
1415
1416 // Same as malloc() except the memory address is a multiple of alignment, which must be a power of two. (obsolete)
1417 void * memalign( size_t alignment, size_t size ) libcfa_public {
1418 return memalignNoStats( alignment, size STAT_ARG( MEMALIGN ) );
1419 } // memalign
1420
1421
1422 // Same as aalloc() with memory alignment.
1423 void * amemalign( size_t alignment, size_t dim, size_t elemSize ) libcfa_public {
1424 return memalignNoStats( alignment, dim * elemSize STAT_ARG( AMEMALIGN ) );
1425 } // amemalign
1426
1427
1428 // Same as calloc() with memory alignment.
1429 void * cmemalign( size_t alignment, size_t dim, size_t elemSize ) libcfa_public {
1430 size_t size = dim * elemSize;
1431 char * addr = (char *)memalignNoStats( alignment, size STAT_ARG( CMEMALIGN ) );
1432
1433 if ( unlikely( addr == NULL ) ) return NULL; // stop further processing if 0p is returned
1434
1435 Heap.Storage.Header * header;
1436 Heap.FreeHeader * freeHead;
1437 size_t bsize;
1438
1439 #ifndef __CFA_DEBUG__
1440 bool mapped =
1441 #endif // __CFA_DEBUG__
1442 headers( "cmemalign", addr, header, freeHead, bsize, alignment );
1443
1444 // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
1445 #ifndef __CFA_DEBUG__
1446 if ( ! mapped )
1447 #endif // __CFA_DEBUG__
1448 // <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined
1449 // `-header`-addr `-size
1450 memset( addr, '\0', size ); // set to zeros
1451
1452 MarkZeroFilledBit( header ); // mark as zero filled
1453 return addr;
1454 } // cmemalign
1455
1456
1457 // Same as memalign(), but ISO/IEC 2011 C11 Section 7.22.2 states: the value of size shall be an integral multiple
1458 // of alignment. This requirement is universally ignored.
1459 void * aligned_alloc( size_t alignment, size_t size ) libcfa_public {
1460 return memalign( alignment, size );
1461 } // aligned_alloc
1462
1463
1464 // Allocates size bytes and places the address of the allocated memory in *memptr. The address of the allocated
1465 // memory shall be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). If size
1466 // is 0, then posix_memalign() returns either 0p, or a unique pointer value that can later be successfully passed to
1467 // free(3).
1468 int posix_memalign( void ** memptr, size_t alignment, size_t size ) libcfa_public {
1469 if ( unlikely( alignment < libAlign() || ! is_pow2( alignment ) ) ) return EINVAL; // check alignment
1470 *memptr = memalign( alignment, size );
1471 return 0;
1472 } // posix_memalign
1473
1474
1475 // Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of the
1476 // page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).
1477 void * valloc( size_t size ) libcfa_public {
1478 return memalign( __page_size, size );
1479 } // valloc
1480
1481
1482 // Same as valloc but rounds size to multiple of page size.
1483 void * pvalloc( size_t size ) libcfa_public {
1484 return memalign( __page_size, ceiling2( size, __page_size ) ); // round size to multiple of page size
1485 } // pvalloc
1486
1487
1488 // Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc()
1489 // or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behaviour occurs. If ptr is
1490 // 0p, no operation is performed.
1491 void free( void * addr ) libcfa_public {
1492 if ( unlikely( addr == 0p ) ) { // special case
1493 #ifdef __STATISTICS__
1494 if ( heapManager )
1495 incZeroCalls( FREE );
1496 #endif // __STATISTICS__
1497 return;
1498 } // if
1499
1500 #ifdef __STATISTICS__
1501 incCalls( FREE );
1502 #endif // __STATISTICS__
1503
1504 doFree( addr ); // handles heapManager == nullptr
1505 } // free
1506
1507
1508 // Returns the alignment of an allocation.
1509 size_t malloc_alignment( void * addr ) libcfa_public {
1510 if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment
1511 Heap.Storage.Header * header = HeaderAddr( addr );
1512 if ( unlikely( AlignmentBit( header ) ) ) { // fake header ?
1513 return ClearAlignmentBit( header ); // clear flag from value
1514 } else {
1515 return libAlign(); // minimum alignment
1516 } // if
1517 } // malloc_alignment
1518
1519
1520 // Returns true if the allocation is zero filled, e.g., allocated by calloc().
1521 bool malloc_zero_fill( void * addr ) libcfa_public {
1522 if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
1523 Heap.Storage.Header * header = HeaderAddr( addr );
1524 if ( unlikely( AlignmentBit( header ) ) ) { // fake header ?
1525 header = RealHeader( header ); // backup from fake to real header
1526 } // if
1527 return ZeroFillBit( header ); // zero filled ?
1528 } // malloc_zero_fill
1529
1530
1531 // Returns original total allocation size (not bucket size) => array size is dimension * sizeof(T).
1532 size_t malloc_size( void * addr ) libcfa_public {
1533 if ( unlikely( addr == 0p ) ) return 0; // null allocation has zero size
1534 Heap.Storage.Header * header = HeaderAddr( addr );
1535 if ( unlikely( AlignmentBit( header ) ) ) { // fake header ?
1536 header = RealHeader( header ); // backup from fake to real header
1537 } // if
1538 return header->kind.real.size;
1539 } // malloc_size
1540
1541
1542 // Returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allocated by
1543 // malloc or a related function.
1544 size_t malloc_usable_size( void * addr ) libcfa_public {
1545 if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size
1546 Heap.Storage.Header * header;
1547 Heap.FreeHeader * freeHead;
1548 size_t bsize, alignment;
1549
1550 headers( "malloc_usable_size", addr, header, freeHead, bsize, alignment );
1551 return DataStorage( bsize, addr, header ); // data storage in bucket
1552 } // malloc_usable_size
1553
1554
1555 // Prints (on default standard error) statistics about memory allocated by malloc and related functions.
1556 void malloc_stats( void ) libcfa_public {
1557 #ifdef __STATISTICS__
1558 HeapStatistics stats;
1559 HeapStatisticsCtor( stats );
1560 if ( printStats( collectStats( stats ) ) == -1 ) {
1561 #else
1562 #define MALLOC_STATS_MSG "malloc_stats statistics disabled.\n"
1563 if ( write( STDERR_FILENO, MALLOC_STATS_MSG, sizeof( MALLOC_STATS_MSG ) - 1 /* size includes '\0' */ ) == -1 ) {
1564 #endif // __STATISTICS__
1565 abort( "**** Error **** write failed in malloc_stats" );
1566 } // if
1567 } // malloc_stats
1568
1569
1570 // Zero the heap master and all active thread heaps.
1571 void malloc_stats_clear() {
1572 #ifdef __STATISTICS__
1573 clearStats();
1574 #else
1575 #define MALLOC_STATS_MSG "malloc_stats statistics disabled.\n"
1576 if ( write( STDERR_FILENO, MALLOC_STATS_MSG, sizeof( MALLOC_STATS_MSG ) - 1 /* size includes '\0' */ ) == -1 ) {
1577 abort( "**** Error **** write failed in malloc_stats" );
1578 } // if
1579 #endif // __STATISTICS__
1580 } // malloc_stats_clear
1581
1582
1583 // Changes the file descriptor where malloc_stats() writes statistics.
1584 int malloc_stats_fd( int fd __attribute__(( unused )) ) libcfa_public {
1585 #ifdef __STATISTICS__
1586 int temp = heapMaster.stats_fd;
1587 heapMaster.stats_fd = fd;
1588 return temp;
1589 #else
1590 return -1; // unsupported
1591 #endif // __STATISTICS__
1592 } // malloc_stats_fd
1593
1594
1595 // Prints an XML string that describes the current state of the memory-allocation implementation in the caller.
1596 // The string is printed on the file stream stream. The exported string includes information about all arenas (see
1597 // malloc).
1598 int malloc_info( int options, FILE * stream __attribute__(( unused )) ) libcfa_public {
1599 if ( options != 0 ) { errno = EINVAL; return -1; }
1600 #ifdef __STATISTICS__
1601 HeapStatistics stats;
1602 HeapStatisticsCtor( stats );
1603 return printStatsXML( collectStats( stats ), stream ); // returns bytes written or -1
1604 #else
1605 return 0; // unsupported
1606 #endif // __STATISTICS__
1607 } // malloc_info
1608
1609
1610 // Adjusts parameters that control the behaviour of the memory-allocation functions (see malloc). The param argument
1611 // specifies the parameter to be modified, and value specifies the new value for that parameter.
1612 int mallopt( int option, int value ) libcfa_public {
1613 if ( value < 0 ) return 0;
1614 choose( option ) {
1615 case M_TOP_PAD:
1616 heapMaster.heapExpand = ceiling2( value, __page_size );
1617 return 1;
1618 case M_MMAP_THRESHOLD:
1619 if ( setMmapStart( value ) ) return 1;
1620 } // choose
1621 return 0; // error, unsupported
1622 } // mallopt
1623
1624
1625 // Attempt to release free memory at the top of the heap (by calling sbrk with a suitable argument).
1626 int malloc_trim( size_t ) libcfa_public {
1627 return 0; // => impossible to release memory
1628 } // malloc_trim
1629
1630
1631 // Records the current state of all malloc internal bookkeeping variables (but not the actual contents of the heap
1632 // or the state of malloc_hook functions pointers). The state is recorded in a system-dependent opaque data
1633 // structure dynamically allocated via malloc, and a pointer to that data structure is returned as the function
1634 // result. (The caller must free this memory.)
1635 void * malloc_get_state( void ) libcfa_public {
1636 return 0p; // unsupported
1637 } // malloc_get_state
1638
1639
1640 // Restores the state of all malloc internal bookkeeping variables to the values recorded in the opaque data
1641 // structure pointed to by state.
1642 int malloc_set_state( void * ) libcfa_public {
1643 return 0; // unsupported
1644 } // malloc_set_state
1645
1646
1647 // Sets the amount (bytes) to extend the heap when there is insufficent free storage to service an allocation.
1648 __attribute__((weak)) size_t malloc_expansion() libcfa_public { return __CFA_DEFAULT_HEAP_EXPANSION__; }
1649
1650 // Sets the crossover point between allocations occuring in the sbrk area or separately mmapped.
1651 __attribute__((weak)) size_t malloc_mmap_start() libcfa_public { return __CFA_DEFAULT_MMAP_START__; }
1652
1653 // Amount subtracted to adjust for unfreed program storage (debug only).
1654 __attribute__((weak)) size_t malloc_unfreed() libcfa_public { return __CFA_DEFAULT_HEAP_UNFREED__; }
1655} // extern "C"
1656
1657
1658// Must have CFA linkage to overload with C linkage realloc.
1659void * resize( void * oaddr, size_t nalign, size_t size ) libcfa_public {
1660 if ( unlikely( oaddr == 0p ) ) { // => malloc( size )
1661 return memalignNoStats( nalign, size STAT_ARG( RESIZE ) );
1662 } // if
1663
1664 PROLOG( RESIZE, doFree( oaddr ) ); // => free( oaddr )
1665
1666 // Attempt to reuse existing alignment.
1667 Heap.Storage.Header * header = HeaderAddr( oaddr );
1668 bool isFakeHeader = AlignmentBit( header ); // old fake header ?
1669 size_t oalign;
1670
1671 if ( unlikely( isFakeHeader ) ) {
1672 checkAlign( nalign ); // check alignment
1673 oalign = ClearAlignmentBit( header ); // old alignment
1674 if ( unlikely( (uintptr_t)oaddr % nalign == 0 // lucky match ?
1675 && ( oalign <= nalign // going down
1676 || (oalign >= nalign && oalign <= 256) ) // little alignment storage wasted ?
1677 ) ) {
1678 HeaderAddr( oaddr )->kind.fake.alignment = MarkAlignmentBit( nalign ); // update alignment (could be the same)
1679 Heap.FreeHeader * freeHead;
1680 size_t bsize, oalign;
1681 headers( "resize", oaddr, header, freeHead, bsize, oalign );
1682 size_t odsize = DataStorage( bsize, oaddr, header ); // data storage available in bucket
1683
1684 if ( size <= odsize && odsize <= size * 2 ) { // allow 50% wasted data storage
1685 HeaderAddr( oaddr )->kind.fake.alignment = MarkAlignmentBit( nalign ); // update alignment (could be the same)
1686 ClearZeroFillBit( header ); // turn off 0 fill
1687 #ifdef __CFA_DEBUG__
1688 incUnfreed( size - header->kind.real.size ); // adjustment off the size difference
1689 #endif // __CFA_DEBUG__
1690 header->kind.real.size = size; // reset allocation size
1691 #ifdef __STATISTICS__
1692 incCalls( RESIZE );
1693 #endif // __STATISTICS__
1694 return oaddr;
1695 } // if
1696 } // if
1697 } else if ( ! isFakeHeader // old real header (aligned on libAlign) ?
1698 && nalign == libAlign() ) { // new alignment also on libAlign => no fake header needed
1699 return resize( oaddr, size ); // duplicate special case checks
1700 } // if
1701
1702 // change size, DO NOT preserve STICKY PROPERTIES.
1703 doFree( oaddr ); // free previous storage
1704 return memalignNoStats( nalign, size STAT_ARG( RESIZE ) ); // create new aligned area
1705} // resize
1706
1707
1708void * realloc( void * oaddr, size_t nalign, size_t size ) libcfa_public {
1709 if ( unlikely( oaddr == 0p ) ) { // => malloc( size )
1710 return memalignNoStats( nalign, size STAT_ARG( REALLOC ) );
1711 } // if
1712
1713 PROLOG( REALLOC, doFree( oaddr ) ); // => free( oaddr )
1714
1715 // Attempt to reuse existing alignment.
1716 Heap.Storage.Header * header = HeaderAddr( oaddr );
1717 bool isFakeHeader = AlignmentBit( header ); // old fake header ?
1718 size_t oalign;
1719 if ( unlikely( isFakeHeader ) ) {
1720 checkAlign( nalign ); // check alignment
1721 oalign = ClearAlignmentBit( header ); // old alignment
1722 if ( unlikely( (uintptr_t)oaddr % nalign == 0 // lucky match ?
1723 && ( oalign <= nalign // going down
1724 || (oalign >= nalign && oalign <= 256) ) // little alignment storage wasted ?
1725 ) ) {
1726 HeaderAddr( oaddr )->kind.fake.alignment = MarkAlignmentBit( nalign ); // update alignment (could be the same)
1727 return realloc( oaddr, size ); // duplicate special case checks
1728 } // if
1729 } else if ( ! isFakeHeader // old real header (aligned on libAlign) ?
1730 && nalign == libAlign() ) { // new alignment also on libAlign => no fake header needed
1731 return realloc( oaddr, size ); // duplicate special case checks
1732 } // if
1733
1734 Heap.FreeHeader * freeHead;
1735 size_t bsize;
1736 headers( "realloc", oaddr, header, freeHead, bsize, oalign );
1737
1738 // change size and copy old content to new storage
1739
1740 size_t osize = header->kind.real.size; // old allocation size
1741 bool ozfill = ZeroFillBit( header ); // old allocation zero filled
1742
1743 void * naddr = memalignNoStats( nalign, size STAT_ARG( REALLOC ) ); // create new aligned area
1744
1745 headers( "realloc", naddr, header, freeHead, bsize, oalign );
1746 memcpy( naddr, oaddr, min( osize, size ) ); // copy bytes
1747 doFree( oaddr ); // free previous storage
1748
1749 if ( unlikely( ozfill ) ) { // previous request zero fill ?
1750 MarkZeroFilledBit( header ); // mark new request as zero filled
1751 if ( size > osize ) { // previous request larger ?
1752 memset( (char *)naddr + osize, '\0', size - osize ); // initialize added storage
1753 } // if
1754 } // if
1755 return naddr;
1756} // realloc
1757
1758
1759void * reallocarray( void * oaddr, size_t nalign, size_t dim, size_t elemSize ) __THROW {
1760 return realloc( oaddr, nalign, dim * elemSize );
1761} // reallocarray
1762
1763
1764// Local Variables: //
1765// tab-width: 4 //
1766// compile-command: "cfa -nodebug -O2 heap.cfa" //
1767// End: //
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