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heap.cfa @ c1f38e6c

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since c1f38e6c was c1f38e6c, checked in by Peter A. Buhr <pabuhr@…>, 4 years ago
formatting, rename variable allocFree to allocUnfreed, fakeHeader returns libAlign() for no fake header instead of 0, update resize/realloc aligned to work with the fakeHeader change.
Property mode set to `100644`
File size: 50.4 KB

Rev	Line
[73abe95]	1	//
[c4f68dc]	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.
[73abe95]	6	//
	7	// heap.c --
	8	//
[c4f68dc]	9	// Author : Peter A. Buhr
	10	// Created On : Tue Dec 19 21:58:35 2017
	11	// Last Modified By : Peter A. Buhr
[c1f38e6c]	12	// Last Modified On : Thu Aug 6 09:08:58 2020
	13	// Update Count : 861
[73abe95]	14	//
[c4f68dc]	15
	16	#include <unistd.h> // sbrk, sysconf
	17	#include <stdbool.h> // true, false
	18	#include <stdio.h> // snprintf, fileno
	19	#include <errno.h> // errno
[1e034d9]	20	#include <string.h> // memset, memcpy
[1076d05]	21	#include <limits.h> // ULONG_MAX
[ada0246d]	22	#include <malloc.h> // memalign, malloc_usable_size
[c4f68dc]	23	#include <sys/mman.h> // mmap, munmap
	24
[bcb14b5]	25	#include "bits/align.hfa" // libPow2
	26	#include "bits/defs.hfa" // likely, unlikely
	27	#include "bits/locks.hfa" // __spinlock_t
[73abe95]	28	#include "startup.hfa" // STARTUP_PRIORITY_MEMORY
[1e034d9]	29	//#include "stdlib.hfa" // bsearchl
[1076d05]	30	#include "bitmanip.hfa" // ceiling
[c4f68dc]	31
[95eb7cf]	32	#define MIN(x, y) (y > x ? x : y)
[c4f68dc]	33
[93c2e0a]	34	static bool traceHeap = false;
[d46ed6e]	35
[baf608a]	36	inline bool traceHeap() { return traceHeap; }
[d46ed6e]	37
[93c2e0a]	38	bool traceHeapOn() {
	39	bool temp = traceHeap;
[d46ed6e]	40	traceHeap = true;
	41	return temp;
	42	} // traceHeapOn
	43
[93c2e0a]	44	bool traceHeapOff() {
	45	bool temp = traceHeap;
[d46ed6e]	46	traceHeap = false;
	47	return temp;
	48	} // traceHeapOff
	49
[baf608a]	50	bool traceHeapTerm() { return false; }
	51
[d46ed6e]	52
[95eb7cf]	53	static bool prtFree = false;
[d46ed6e]	54
[95eb7cf]	55	inline bool prtFree() {
	56	return prtFree;
	57	} // prtFree
[5d4fa18]	58
[95eb7cf]	59	bool prtFreeOn() {
	60	bool temp = prtFree;
	61	prtFree = true;
[5d4fa18]	62	return temp;
[95eb7cf]	63	} // prtFreeOn
[5d4fa18]	64
[95eb7cf]	65	bool prtFreeOff() {
	66	bool temp = prtFree;
	67	prtFree = false;
[5d4fa18]	68	return temp;
[95eb7cf]	69	} // prtFreeOff
[5d4fa18]	70
	71
[e723100]	72	enum {
[1e034d9]	73	// Define the default extension heap amount in units of bytes. When the uC++ supplied heap reaches the brk address,
	74	// the brk address is extended by the extension amount.
[e723100]	75	__CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024),
[1e034d9]	76
	77	// Define the mmap crossover point during allocation. Allocations less than this amount are allocated from buckets;
	78	// values greater than or equal to this value are mmap from the operating system.
	79	__CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1),
[e723100]	80	};
	81
[dd23e66]	82	size_t default_mmap_start() __attribute__(( weak )) {
	83	return __CFA_DEFAULT_MMAP_START__;
	84	} // default_mmap_start
	85
[e723100]	86	size_t default_heap_expansion() __attribute__(( weak )) {
	87	return __CFA_DEFAULT_HEAP_EXPANSION__;
	88	} // default_heap_expansion
	89
[dd23e66]	90	bool default_heap_exhausted() __attribute__(( weak )) { // find and free some storage
	91	// Returning false prints "out of heap memory" message and aborts.
	92	return false;
	93	} // default_heap_exhausted
[1076d05]	94
[e723100]	95
[f0b3f51]	96	#ifdef __CFA_DEBUG__
[c1f38e6c]	97	static unsigned int allocUnfreed; // running total of allocations minus frees
[d46ed6e]	98
[95eb7cf]	99	static void prtUnfreed() {
[c1f38e6c]	100	if ( allocUnfreed != 0 ) {
[d46ed6e]	101	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
[4ea1c6d]	102	char helpText[512];
	103	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"
	104	"Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n",
[c1f38e6c]	105	(long int)getpid(), allocUnfreed, allocUnfreed ); // always print the UNIX pid
[4ea1c6d]	106	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[b6830d74]	107	} // if
[95eb7cf]	108	} // prtUnfreed
[d46ed6e]	109
	110	extern "C" {
[bcb14b5]	111	void heapAppStart() { // called by __cfaabi_appready_startup
[c1f38e6c]	112	allocUnfreed = 0;
[bcb14b5]	113	} // heapAppStart
	114
	115	void heapAppStop() { // called by __cfaabi_appready_startdown
	116	fclose( stdin ); fclose( stdout );
[95eb7cf]	117	prtUnfreed();
[bcb14b5]	118	} // heapAppStop
[d46ed6e]	119	} // extern "C"
	120	#endif // __CFA_DEBUG__
	121
[1e034d9]	122
[e723100]	123	// statically allocated variables => zero filled.
	124	static size_t pageSize; // architecture pagesize
	125	static size_t heapExpand; // sbrk advance
	126	static size_t mmapStart; // cross over point for mmap
	127	static unsigned int maxBucketsUsed; // maximum number of buckets in use
	128
	129
	130	#define SPINLOCK 0
	131	#define LOCKFREE 1
	132	#define BUCKETLOCK SPINLOCK
[9c438546]	133	#if BUCKETLOCK == SPINLOCK
	134	#elif BUCKETLOCK == LOCKFREE
	135	#include <stackLockFree.hfa>
	136	#else
	137	#error undefined lock type for bucket lock
[e723100]	138	#endif // LOCKFREE
	139
	140	// Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage.
	141	// Break recusion by hardcoding number of buckets and statically checking number is correct after bucket array defined.
[95eb7cf]	142	enum { NoBucketSizes = 91 }; // number of buckets sizes
[d46ed6e]	143
[c4f68dc]	144	struct HeapManager {
	145	struct Storage {
[bcb14b5]	146	struct Header { // header
[c4f68dc]	147	union Kind {
	148	struct RealHeader {
	149	union {
[bcb14b5]	150	struct { // 4-byte word => 8-byte header, 8-byte word => 16-byte header
[f0b3f51]	151	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[9c438546]	152	uint64_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	153	#endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	154
	155	union {
[9c438546]	156	// FreeHeader * home; // allocated block points back to home locations (must overlay alignment)
[cfbc703d]	157	// 2nd low-order bit => zero filled
[c4f68dc]	158	void * home; // allocated block points back to home locations (must overlay alignment)
	159	size_t blockSize; // size for munmap (must overlay alignment)
[9c438546]	160	#if BUCKETLOCK == SPINLOCK
[c4f68dc]	161	Storage * next; // freed block points next freed block of same size
	162	#endif // SPINLOCK
	163	};
[9c438546]	164	size_t size; // allocation size in bytes
[c4f68dc]	165
[f0b3f51]	166	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[9c438546]	167	uint64_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	168	#endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	169	};
[9c438546]	170	#if BUCKETLOCK == LOCKFREE
	171	Link(Storage) next; // freed block points next freed block of same size (double-wide)
[c4f68dc]	172	#endif // LOCKFREE
	173	};
[93c2e0a]	174	} real; // RealHeader
[9c438546]	175
[c4f68dc]	176	struct FakeHeader {
	177	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
[9c438546]	178	uint32_t alignment; // 1st low-order bit => fake header & alignment
[f0b3f51]	179	#endif // __ORDER_LITTLE_ENDIAN__
[c4f68dc]	180
	181	uint32_t offset;
	182
	183	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	184	uint32_t alignment; // low-order bits of home/blockSize used for tricks
[f0b3f51]	185	#endif // __ORDER_BIG_ENDIAN__
[93c2e0a]	186	} fake; // FakeHeader
	187	} kind; // Kind
[bcb14b5]	188	} header; // Header
[95eb7cf]	189	char pad[libAlign() - sizeof( Header )];
[bcb14b5]	190	char data[0]; // storage
[c4f68dc]	191	}; // Storage
	192
[95eb7cf]	193	static_assert( libAlign() >= sizeof( Storage ), "libAlign() < sizeof( Storage )" );
[c4f68dc]	194
	195	struct FreeHeader {
[9c438546]	196	#if BUCKETLOCK == SPINLOCK
[bcb14b5]	197	__spinlock_t lock; // must be first field for alignment
	198	Storage * freeList;
[c4f68dc]	199	#else
[9c438546]	200	StackLF(Storage) freeList;
	201	#endif // BUCKETLOCK
[bcb14b5]	202	size_t blockSize; // size of allocations on this list
[c4f68dc]	203	}; // FreeHeader
	204
	205	// must be first fields for alignment
	206	__spinlock_t extlock; // protects allocation-buffer extension
	207	FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes
	208
	209	void * heapBegin; // start of heap
	210	void * heapEnd; // logical end of heap
	211	size_t heapRemaining; // amount of storage not allocated in the current chunk
	212	}; // HeapManager
	213
[9c438546]	214	#if BUCKETLOCK == LOCKFREE
[c45d2fa]	215	static inline {
[8b58bae]	216	Link(HeapManager.Storage) * ?`next( HeapManager.Storage * this ) { return &this->header.kind.real.next; }
[c45d2fa]	217	void ?{}( HeapManager.FreeHeader & ) {}
	218	void ^?{}( HeapManager.FreeHeader & ) {}
	219	} // distribution
[9c438546]	220	#endif // LOCKFREE
	221
[7b149bc]	222	static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; }
[5d4fa18]	223
[e723100]	224
	225	#define FASTLOOKUP
	226	#define __STATISTICS__
[5d4fa18]	227
[c1f38e6c]	228	// Size of array must harmonize with NoBucketSizes and individual bucket sizes must be multiple of 16.
[d5d3a90]	229	// Smaller multiples of 16 and powers of 2 are common allocation sizes, so make them generate the minimum required bucket size.
	230	// malloc(0) returns 0p, so no bucket is necessary for 0 bytes returning an address that can be freed.
[e723100]	231	static const unsigned int bucketSizes[] @= { // different bucket sizes
[d5d3a90]	232	16 + sizeof(HeapManager.Storage), 32 + sizeof(HeapManager.Storage), 48 + sizeof(HeapManager.Storage), 64 + sizeof(HeapManager.Storage), // 4
	233	96 + sizeof(HeapManager.Storage), 112 + sizeof(HeapManager.Storage), 128 + sizeof(HeapManager.Storage), // 3
[95eb7cf]	234	160, 192, 224, 256 + sizeof(HeapManager.Storage), // 4
	235	320, 384, 448, 512 + sizeof(HeapManager.Storage), // 4
	236	640, 768, 896, 1_024 + sizeof(HeapManager.Storage), // 4
	237	1_536, 2_048 + sizeof(HeapManager.Storage), // 2
	238	2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), // 4
	239	6_144, 8_192 + sizeof(HeapManager.Storage), // 2
	240	9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 16_384 + sizeof(HeapManager.Storage), // 8
	241	18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 32_768 + sizeof(HeapManager.Storage), // 8
	242	36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 65_536 + sizeof(HeapManager.Storage), // 8
	243	73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 131_072 + sizeof(HeapManager.Storage), // 8
	244	147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 262_144 + sizeof(HeapManager.Storage), // 8
	245	294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 524_288 + sizeof(HeapManager.Storage), // 8
	246	655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), // 4
	247	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
	248	2_621_440, 3_145_728, 3_670_016, 4_194_304 + sizeof(HeapManager.Storage), // 4
[5d4fa18]	249	};
[e723100]	250
[c1f38e6c]	251	static_assert( NoBucketSizes == sizeof(bucketSizes) / sizeof(bucketSizes[0] ), "size of bucket array wrong" );
[e723100]	252
[5d4fa18]	253	#ifdef FASTLOOKUP
[a92a4fe]	254	enum { LookupSizes = 65_536 + sizeof(HeapManager.Storage) }; // number of fast lookup sizes
[5d4fa18]	255	static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes
	256	#endif // FASTLOOKUP
	257
[95eb7cf]	258	static int mmapFd = -1; // fake or actual fd for anonymous file
[5d4fa18]	259	#ifdef __CFA_DEBUG__
[93c2e0a]	260	static bool heapBoot = 0; // detect recursion during boot
[5d4fa18]	261	#endif // __CFA_DEBUG__
[9c438546]	262
	263	// The constructor for heapManager is called explicitly in memory_startup.
[5d4fa18]	264	static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing
	265
[c4f68dc]	266
	267	#ifdef __STATISTICS__
[95eb7cf]	268	// Heap statistics counters.
[c4f68dc]	269	static unsigned int malloc_calls;
[c1f38e6c]	270	static unsigned long long int malloc_storage;
[76e2113]	271	static unsigned int aalloc_calls;
[c1f38e6c]	272	static unsigned long long int aalloc_storage;
[c4f68dc]	273	static unsigned int calloc_calls;
[c1f38e6c]	274	static unsigned long long int calloc_storage;
[c4f68dc]	275	static unsigned int memalign_calls;
[c1f38e6c]	276	static unsigned long long int memalign_storage;
[76e2113]	277	static unsigned int amemalign_calls;
[c1f38e6c]	278	static unsigned long long int amemalign_storage;
[c4f68dc]	279	static unsigned int cmemalign_calls;
[c1f38e6c]	280	static unsigned long long int cmemalign_storage;
[cfbc703d]	281	static unsigned int resize_calls;
[c1f38e6c]	282	static unsigned long long int resize_storage;
[c4f68dc]	283	static unsigned int realloc_calls;
[c1f38e6c]	284	static unsigned long long int realloc_storage;
	285	static unsigned int free_calls;
	286	static unsigned long long int free_storage;
	287	static unsigned int mmap_calls;
	288	static unsigned long long int mmap_storage;
	289	static unsigned int munmap_calls;
	290	static unsigned long long int munmap_storage;
	291	static unsigned int sbrk_calls;
	292	static unsigned long long int sbrk_storage;
[95eb7cf]	293	// Statistics file descriptor (changed by malloc_stats_fd).
	294	static int statfd = STDERR_FILENO; // default stderr
[c4f68dc]	295
	296	// Use "write" because streams may be shutdown when calls are made.
[d46ed6e]	297	static void printStats() {
[76e2113]	298	char helpText[1024];
[95eb7cf]	299	__cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText),
[bcb14b5]	300	"\nHeap statistics:\n"
	301	" malloc: calls %u / storage %llu\n"
[76e2113]	302	" aalloc: calls %u / storage %llu\n"
[bcb14b5]	303	" calloc: calls %u / storage %llu\n"
	304	" memalign: calls %u / storage %llu\n"
[76e2113]	305	" amemalign: calls %u / storage %llu\n"
[bcb14b5]	306	" cmemalign: calls %u / storage %llu\n"
[cfbc703d]	307	" resize: calls %u / storage %llu\n"
[bcb14b5]	308	" realloc: calls %u / storage %llu\n"
	309	" free: calls %u / storage %llu\n"
	310	" mmap: calls %u / storage %llu\n"
	311	" munmap: calls %u / storage %llu\n"
	312	" sbrk: calls %u / storage %llu\n",
	313	malloc_calls, malloc_storage,
[76e2113]	314	aalloc_calls, calloc_storage,
[bcb14b5]	315	calloc_calls, calloc_storage,
	316	memalign_calls, memalign_storage,
[76e2113]	317	amemalign_calls, amemalign_storage,
[bcb14b5]	318	cmemalign_calls, cmemalign_storage,
[cfbc703d]	319	resize_calls, resize_storage,
[bcb14b5]	320	realloc_calls, realloc_storage,
	321	free_calls, free_storage,
	322	mmap_calls, mmap_storage,
	323	munmap_calls, munmap_storage,
	324	sbrk_calls, sbrk_storage
[c4f68dc]	325	);
[d46ed6e]	326	} // printStats
[c4f68dc]	327
[bcb14b5]	328	static int printStatsXML( FILE * stream ) { // see malloc_info
[76e2113]	329	char helpText[1024];
[b6830d74]	330	int len = snprintf( helpText, sizeof(helpText),
[c4f68dc]	331	"<malloc version=\"1\">\n"
	332	"<heap nr=\"0\">\n"
	333	"<sizes>\n"
	334	"</sizes>\n"
	335	"<total type=\"malloc\" count=\"%u\" size=\"%llu\"/>\n"
[76e2113]	336	"<total type=\"aalloc\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	337	"<total type=\"calloc\" count=\"%u\" size=\"%llu\"/>\n"
	338	"<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n"
[76e2113]	339	"<total type=\"amemalign\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	340	"<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n"
[cfbc703d]	341	"<total type=\"resize\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	342	"<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n"
	343	"<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n"
	344	"<total type=\"mmap\" count=\"%u\" size=\"%llu\"/>\n"
	345	"<total type=\"munmap\" count=\"%u\" size=\"%llu\"/>\n"
	346	"<total type=\"sbrk\" count=\"%u\" size=\"%llu\"/>\n"
	347	"</malloc>",
	348	malloc_calls, malloc_storage,
[76e2113]	349	aalloc_calls, aalloc_storage,
[c4f68dc]	350	calloc_calls, calloc_storage,
	351	memalign_calls, memalign_storage,
[76e2113]	352	amemalign_calls, amemalign_storage,
[c4f68dc]	353	cmemalign_calls, cmemalign_storage,
[cfbc703d]	354	resize_calls, resize_storage,
[c4f68dc]	355	realloc_calls, realloc_storage,
	356	free_calls, free_storage,
	357	mmap_calls, mmap_storage,
	358	munmap_calls, munmap_storage,
	359	sbrk_calls, sbrk_storage
	360	);
[95eb7cf]	361	__cfaabi_bits_write( fileno( stream ), helpText, len ); // ensures all bytes written or exit
	362	return len;
[d46ed6e]	363	} // printStatsXML
[c4f68dc]	364	#endif // __STATISTICS__
	365
[95eb7cf]	366
[1e034d9]	367	// thunk problem
	368	size_t Bsearchl( unsigned int key, const unsigned int * vals, size_t dim ) {
	369	size_t l = 0, m, h = dim;
	370	while ( l < h ) {
	371	m = (l + h) / 2;
	372	if ( (unsigned int &)(vals[m]) < key ) { // cast away const
	373	l = m + 1;
	374	} else {
	375	h = m;
	376	} // if
	377	} // while
	378	return l;
	379	} // Bsearchl
	380
	381
[95eb7cf]	382	static inline bool setMmapStart( size_t value ) { // true => mmapped, false => sbrk
[1076d05]	383	if ( value < pageSize \|\| bucketSizes[NoBucketSizes - 1] < value ) return false;
[95eb7cf]	384	mmapStart = value; // set global
	385
	386	// find the closest bucket size less than or equal to the mmapStart size
[1e034d9]	387	maxBucketsUsed = Bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search
[95eb7cf]	388	assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ?
	389	assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?
[1076d05]	390	return true;
[95eb7cf]	391	} // setMmapStart
	392
	393
[cfbc703d]	394	// <-------+----------------------------------------------------> bsize (bucket size)
	395	// \|header \|addr
	396	//==================================================================================
	397	// align/offset \|
	398	// <-----------------<------------+-----------------------------> bsize (bucket size)
	399	// \|fake-header \| addr
	400	#define headerAddr( addr ) ((HeapManager.Storage.Header )( (char )addr - sizeof(HeapManager.Storage) ))
	401	#define realHeader( header ) ((HeapManager.Storage.Header )((char )header - header->kind.fake.offset))
	402
	403	// <-------<<--------------------- dsize ---------------------->> bsize (bucket size)
	404	// \|header \|addr
	405	//==================================================================================
	406	// align/offset \|
	407	// <------------------------------<<---------- dsize --------->>> bsize (bucket size)
	408	// \|fake-header \|addr
	409	#define dataStorage( bsize, addr, header ) (bsize - ( (char )addr - (char )header ))
	410
	411
	412	static inline void checkAlign( size_t alignment ) {
	413	if ( alignment < libAlign() \|\| ! libPow2( alignment ) ) {
	414	abort( "Alignment %zu for memory allocation is less than %d and/or not a power of 2.", alignment, libAlign() );
	415	} // if
	416	} // checkAlign
	417
	418
[e3fea42]	419	static inline void checkHeader( bool check, const char name[], void * addr ) {
[b6830d74]	420	if ( unlikely( check ) ) { // bad address ?
[c4f68dc]	421	abort( "Attempt to %s storage %p with address outside the heap.\n"
[bcb14b5]	422	"Possible cause is duplicate free on same block or overwriting of memory.",
	423	name, addr );
[b6830d74]	424	} // if
[c4f68dc]	425	} // checkHeader
	426
[95eb7cf]	427
	428	static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & alignment ) {
[b6830d74]	429	if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ?
[c4f68dc]	430	alignment = header->kind.fake.alignment & -2; // remove flag from value
	431	#ifdef __CFA_DEBUG__
	432	checkAlign( alignment ); // check alignment
	433	#endif // __CFA_DEBUG__
[cfbc703d]	434	header = realHeader( header ); // backup from fake to real header
[d5d3a90]	435	} else {
[c1f38e6c]	436	alignment = libAlign(); // => no fake header
[b6830d74]	437	} // if
[c4f68dc]	438	} // fakeHeader
	439
[95eb7cf]	440
[9c438546]	441	static inline bool headers( const char name[] __attribute__(( unused )), void * addr, HeapManager.Storage.Header & header, HeapManager.FreeHeader & freeElem,
	442	size_t & size, size_t & alignment ) with( heapManager ) {
[b6830d74]	443	header = headerAddr( addr );
[c4f68dc]	444
[b6830d74]	445	if ( unlikely( heapEnd < addr ) ) { // mmapped ?
[95eb7cf]	446	fakeHeader( header, alignment );
[c4f68dc]	447	size = header->kind.real.blockSize & -3; // mmap size
	448	return true;
[b6830d74]	449	} // if
[c4f68dc]	450
	451	#ifdef __CFA_DEBUG__
[1076d05]	452	checkHeader( addr < heapBegin, name, addr ); // bad low address ?
[c4f68dc]	453	#endif // __CFA_DEBUG__
[b6830d74]	454
[bcb14b5]	455	// header may be safe to dereference
[95eb7cf]	456	fakeHeader( header, alignment );
[c4f68dc]	457	#ifdef __CFA_DEBUG__
[bcb14b5]	458	checkHeader( header < (HeapManager.Storage.Header )heapBegin \|\| (HeapManager.Storage.Header )heapEnd < header, name, addr ); // bad address ? (offset could be + or -)
[c4f68dc]	459	#endif // __CFA_DEBUG__
	460
[bcb14b5]	461	freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3);
[c4f68dc]	462	#ifdef __CFA_DEBUG__
[bcb14b5]	463	if ( freeElem < &freeLists[0] \|\| &freeLists[NoBucketSizes] <= freeElem ) {
	464	abort( "Attempt to %s storage %p with corrupted header.\n"
	465	"Possible cause is duplicate free on same block or overwriting of header information.",
	466	name, addr );
	467	} // if
[c4f68dc]	468	#endif // __CFA_DEBUG__
[bcb14b5]	469	size = freeElem->blockSize;
	470	return false;
[c4f68dc]	471	} // headers
	472
[dd23e66]	473	#define NO_MEMORY_MSG "no heap memory available for allocating %zd new bytes."
[c4f68dc]	474
[9c438546]	475	static inline void * extend( size_t size ) with( heapManager ) {
[b6830d74]	476	lock( extlock __cfaabi_dbg_ctx2 );
	477	ptrdiff_t rem = heapRemaining - size;
	478	if ( rem < 0 ) {
[c4f68dc]	479	// If the size requested is bigger than the current remaining storage, increase the size of the heap.
	480
	481	size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() );
[dd23e66]	482	Succeed:
	483	{
	484	if ( sbrk( increase ) != (void *)-1 ) break Succeed; // succeed ?
	485	if ( default_heap_exhausted() ) { // try fix
	486	if ( sbrk( increase ) != (void *)-1 ) break Succeed; // succeed ?
	487	} // if
[c4f68dc]	488	unlock( extlock );
[dd23e66]	489	abort( NO_MEMORY_MSG, size ); // give up
	490	}
[bcb14b5]	491	#ifdef __STATISTICS__
[c4f68dc]	492	sbrk_calls += 1;
	493	sbrk_storage += increase;
[bcb14b5]	494	#endif // __STATISTICS__
	495	#ifdef __CFA_DEBUG__
[c4f68dc]	496	// Set new memory to garbage so subsequent uninitialized usages might fail.
	497	memset( (char *)heapEnd + heapRemaining, '\377', increase );
[bcb14b5]	498	#endif // __CFA_DEBUG__
[c4f68dc]	499	rem = heapRemaining + increase - size;
[b6830d74]	500	} // if
[c4f68dc]	501
[b6830d74]	502	HeapManager.Storage * block = (HeapManager.Storage *)heapEnd;
	503	heapRemaining = rem;
	504	heapEnd = (char *)heapEnd + size;
	505	unlock( extlock );
	506	return block;
[c4f68dc]	507	} // extend
	508
	509
[9c438546]	510	static inline void * doMalloc( size_t size ) with( heapManager ) {
[7b149bc]	511	HeapManager.Storage * block; // pointer to new block of storage
[c4f68dc]	512
[b6830d74]	513	// Look up size in the size list. Make sure the user request includes space for the header that must be allocated
	514	// along with the block and is a multiple of the alignment size.
[c4f68dc]	515
[1076d05]	516	if ( unlikely( size > ULONG_MAX - sizeof(HeapManager.Storage) ) ) return 0p;
[b6830d74]	517	size_t tsize = size + sizeof(HeapManager.Storage);
	518	if ( likely( tsize < mmapStart ) ) { // small size => sbrk
[e723100]	519	size_t posn;
	520	#ifdef FASTLOOKUP
	521	if ( tsize < LookupSizes ) posn = lookup[tsize];
	522	else
	523	#endif // FASTLOOKUP
	524	posn = Bsearchl( (unsigned int)tsize, bucketSizes, (size_t)maxBucketsUsed );
	525	HeapManager.FreeHeader * freeElem = &freeLists[posn];
	526	// #ifdef FASTLOOKUP
	527	// if ( tsize < LookupSizes )
	528	// freeElem = &freeLists[lookup[tsize]];
	529	// else
	530	// #endif // FASTLOOKUP
	531	// freeElem = bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
	532	// HeapManager.FreeHeader * freeElem =
	533	// #ifdef FASTLOOKUP
	534	// tsize < LookupSizes ? &freeLists[lookup[tsize]] :
	535	// #endif // FASTLOOKUP
	536	// bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
[c1f38e6c]	537	verify( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ?
	538	verify( tsize <= freeElem->blockSize ); // search failure ?
[c4f68dc]	539	tsize = freeElem->blockSize; // total space needed for request
	540
	541	// Spin until the lock is acquired for this particular size of block.
	542
[9c438546]	543	#if BUCKETLOCK == SPINLOCK
[bcb14b5]	544	lock( freeElem->lock __cfaabi_dbg_ctx2 );
	545	block = freeElem->freeList; // remove node from stack
[c4f68dc]	546	#else
[9c438546]	547	block = pop( freeElem->freeList );
	548	#endif // BUCKETLOCK
[95eb7cf]	549	if ( unlikely( block == 0p ) ) { // no free block ?
[9c438546]	550	#if BUCKETLOCK == SPINLOCK
[c4f68dc]	551	unlock( freeElem->lock );
[9c438546]	552	#endif // BUCKETLOCK
[bcb14b5]	553
[c4f68dc]	554	// Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more
	555	// and then carve it off.
	556
	557	block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call
[9c438546]	558	#if BUCKETLOCK == SPINLOCK
[c4f68dc]	559	} else {
	560	freeElem->freeList = block->header.kind.real.next;
	561	unlock( freeElem->lock );
[9c438546]	562	#endif // BUCKETLOCK
[c4f68dc]	563	} // if
	564
	565	block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size
[bcb14b5]	566	} else { // large size => mmap
[1076d05]	567	if ( unlikely( size > ULONG_MAX - pageSize ) ) return 0p;
[c4f68dc]	568	tsize = libCeiling( tsize, pageSize ); // must be multiple of page size
	569	#ifdef __STATISTICS__
[bcb14b5]	570	__atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST );
	571	__atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST );
[c4f68dc]	572	#endif // __STATISTICS__
[dd23e66]	573	Succeed:
	574	{
	575	block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| MAP_ANONYMOUS, mmapFd, 0 );
	576	if ( block != (HeapManager.Storage *)MAP_FAILED ) break Succeed; // succeed ?
	577	if ( errno == ENOMEM && default_heap_exhausted() ) { // out of memory and try again ?
	578	block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| MAP_ANONYMOUS, mmapFd, 0 );
	579	if ( block != (HeapManager.Storage *)MAP_FAILED ) break Succeed; // succeed ?
	580	} // if
	581	if ( errno == ENOMEM ) abort( NO_MEMORY_MSG, tsize );
[c4f68dc]	582	// Do not call strerror( errno ) as it may call malloc.
	583	abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu error:%d.", &heapManager, tsize, errno );
[dd23e66]	584	}
[bcb14b5]	585	#ifdef __CFA_DEBUG__
[c4f68dc]	586	// Set new memory to garbage so subsequent uninitialized usages might fail.
	587	memset( block, '\377', tsize );
[bcb14b5]	588	#endif // __CFA_DEBUG__
[c4f68dc]	589	block->header.kind.real.blockSize = tsize; // storage size for munmap
[bcb14b5]	590	} // if
[c4f68dc]	591
[9c438546]	592	block->header.kind.real.size = size; // store allocation size
[95eb7cf]	593	void * addr = &(block->data); // adjust off header to user bytes
[c1f38e6c]	594	verify( ((uintptr_t)addr & (libAlign() - 1)) == 0 ); // minimum alignment ?
[c4f68dc]	595
	596	#ifdef __CFA_DEBUG__
[c1f38e6c]	597	__atomic_add_fetch( &allocUnfreed, tsize, __ATOMIC_SEQ_CST );
[bcb14b5]	598	if ( traceHeap() ) {
	599	enum { BufferSize = 64 };
	600	char helpText[BufferSize];
[95eb7cf]	601	int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", addr, size, tsize );
	602	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[bcb14b5]	603	} // if
[c4f68dc]	604	#endif // __CFA_DEBUG__
	605
[95eb7cf]	606	return addr;
[c4f68dc]	607	} // doMalloc
	608
	609
[9c438546]	610	static inline void doFree( void * addr ) with( heapManager ) {
[c4f68dc]	611	#ifdef __CFA_DEBUG__
[95eb7cf]	612	if ( unlikely( heapManager.heapBegin == 0p ) ) {
[bcb14b5]	613	abort( "doFree( %p ) : internal error, called before heap is initialized.", addr );
	614	} // if
[c4f68dc]	615	#endif // __CFA_DEBUG__
	616
[b6830d74]	617	HeapManager.Storage.Header * header;
	618	HeapManager.FreeHeader * freeElem;
	619	size_t size, alignment; // not used (see realloc)
[c4f68dc]	620
[b6830d74]	621	if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ?
[c4f68dc]	622	#ifdef __STATISTICS__
[bcb14b5]	623	__atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST );
	624	__atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	625	#endif // __STATISTICS__
	626	if ( munmap( header, size ) == -1 ) {
	627	#ifdef __CFA_DEBUG__
	628	abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n"
[bcb14b5]	629	"Possible cause is invalid pointer.",
	630	addr );
[c4f68dc]	631	#endif // __CFA_DEBUG__
	632	} // if
[bcb14b5]	633	} else {
[c4f68dc]	634	#ifdef __CFA_DEBUG__
[bcb14b5]	635	// Set free memory to garbage so subsequent usages might fail.
	636	memset( ((HeapManager.Storage *)header)->data, '\377', freeElem->blockSize - sizeof( HeapManager.Storage ) );
[c4f68dc]	637	#endif // __CFA_DEBUG__
	638
	639	#ifdef __STATISTICS__
[bcb14b5]	640	free_storage += size;
[c4f68dc]	641	#endif // __STATISTICS__
[9c438546]	642	#if BUCKETLOCK == SPINLOCK
[bcb14b5]	643	lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock
	644	header->kind.real.next = freeElem->freeList; // push on stack
	645	freeElem->freeList = (HeapManager.Storage *)header;
	646	unlock( freeElem->lock ); // release spin lock
[c4f68dc]	647	#else
[9c438546]	648	push( freeElem->freeList, (HeapManager.Storage )header );
	649	#endif // BUCKETLOCK
[bcb14b5]	650	} // if
[c4f68dc]	651
	652	#ifdef __CFA_DEBUG__
[c1f38e6c]	653	__atomic_add_fetch( &allocUnfreed, -size, __ATOMIC_SEQ_CST );
[bcb14b5]	654	if ( traceHeap() ) {
[7b149bc]	655	enum { BufferSize = 64 };
	656	char helpText[BufferSize];
[bcb14b5]	657	int len = snprintf( helpText, sizeof(helpText), "Free( %p ) size:%zu\n", addr, size );
[95eb7cf]	658	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[bcb14b5]	659	} // if
[c4f68dc]	660	#endif // __CFA_DEBUG__
	661	} // doFree
	662
	663
[9c438546]	664	size_t prtFree( HeapManager & manager ) with( manager ) {
[b6830d74]	665	size_t total = 0;
[c4f68dc]	666	#ifdef __STATISTICS__
[95eb7cf]	667	__cfaabi_bits_acquire();
	668	__cfaabi_bits_print_nolock( STDERR_FILENO, "\nBin lists (bin size : free blocks on list)\n" );
[c4f68dc]	669	#endif // __STATISTICS__
[b6830d74]	670	for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) {
[d46ed6e]	671	size_t size = freeLists[i].blockSize;
	672	#ifdef __STATISTICS__
	673	unsigned int N = 0;
	674	#endif // __STATISTICS__
[b6830d74]	675
[9c438546]	676	#if BUCKETLOCK == SPINLOCK
[95eb7cf]	677	for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0p; p = p->header.kind.real.next ) {
[d46ed6e]	678	#else
[9c438546]	679	for ( HeapManager.Storage * p = top( freeLists[i].freeList ); p != 0p; /* p = getNext( p )->top */) {
[0f89d4f]	680	typeof(p) temp = ( p )`next->top; // FIX ME: direct assignent fails, initialization works
[9c438546]	681	p = temp;
	682	#endif // BUCKETLOCK
[d46ed6e]	683	total += size;
	684	#ifdef __STATISTICS__
	685	N += 1;
	686	#endif // __STATISTICS__
[b6830d74]	687	} // for
	688
[d46ed6e]	689	#ifdef __STATISTICS__
[95eb7cf]	690	__cfaabi_bits_print_nolock( STDERR_FILENO, "%7zu, %-7u ", size, N );
	691	if ( (i + 1) % 8 == 0 ) __cfaabi_bits_print_nolock( STDERR_FILENO, "\n" );
[d46ed6e]	692	#endif // __STATISTICS__
	693	} // for
	694	#ifdef __STATISTICS__
[95eb7cf]	695	__cfaabi_bits_print_nolock( STDERR_FILENO, "\ntotal free blocks:%zu\n", total );
	696	__cfaabi_bits_release();
[d46ed6e]	697	#endif // __STATISTICS__
	698	return (char )heapEnd - (char )heapBegin - total;
[95eb7cf]	699	} // prtFree
	700
	701
[9c438546]	702	static void ?{}( HeapManager & manager ) with( manager ) {
[95eb7cf]	703	pageSize = sysconf( _SC_PAGESIZE );
	704
	705	for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists
	706	freeLists[i].blockSize = bucketSizes[i];
	707	} // for
	708
	709	#ifdef FASTLOOKUP
	710	unsigned int idx = 0;
	711	for ( unsigned int i = 0; i < LookupSizes; i += 1 ) {
	712	if ( i > bucketSizes[idx] ) idx += 1;
	713	lookup[i] = idx;
	714	} // for
	715	#endif // FASTLOOKUP
	716
[1076d05]	717	if ( ! setMmapStart( default_mmap_start() ) ) {
[95eb7cf]	718	abort( "HeapManager : internal error, mmap start initialization failure." );
	719	} // if
	720	heapExpand = default_heap_expansion();
	721
[1e034d9]	722	char * end = (char *)sbrk( 0 );
[1076d05]	723	heapBegin = heapEnd = sbrk( (char *)libCeiling( (long unsigned int)end, libAlign() ) - end ); // move start of heap to multiple of alignment
[95eb7cf]	724	} // HeapManager
	725
	726
	727	static void ^?{}( HeapManager & ) {
	728	#ifdef __STATISTICS__
[baf608a]	729	if ( traceHeapTerm() ) {
	730	printStats();
	731	// if ( prtfree() ) prtFree( heapManager, true );
	732	} // if
[95eb7cf]	733	#endif // __STATISTICS__
	734	} // ~HeapManager
	735
	736
	737	static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) ));
	738	void memory_startup( void ) {
	739	#ifdef __CFA_DEBUG__
	740	if ( unlikely( heapBoot ) ) { // check for recursion during system boot
	741	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
	742	abort( "boot() : internal error, recursively invoked during system boot." );
	743	} // if
	744	heapBoot = true;
	745	#endif // __CFA_DEBUG__
	746
[c1f38e6c]	747	//verify( heapManager.heapBegin != 0 );
[95eb7cf]	748	//heapManager{};
[1076d05]	749	if ( heapManager.heapBegin == 0p ) heapManager{}; // sanity check
[95eb7cf]	750	} // memory_startup
	751
	752	static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) ));
	753	void memory_shutdown( void ) {
	754	^heapManager{};
	755	} // memory_shutdown
[c4f68dc]	756
[bcb14b5]	757
	758	static inline void * mallocNoStats( size_t size ) { // necessary for malloc statistics
[d5d3a90]	759	verify( heapManager.heapBegin != 0 ); // called before memory_startup ?
[dd23e66]	760	if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER
[d5d3a90]	761
[76e2113]	762	#if __SIZEOF_POINTER__ == 8
	763	verify( size < ((typeof(size_t))1 << 48) );
	764	#endif // __SIZEOF_POINTER__ == 8
[d5d3a90]	765	return doMalloc( size );
[bcb14b5]	766	} // mallocNoStats
[c4f68dc]	767
	768
[76e2113]	769	static inline void * callocNoStats( size_t dim, size_t elemSize ) {
	770	size_t size = dim * elemSize;
[dd23e66]	771	if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER
[95eb7cf]	772	char * addr = (char *)mallocNoStats( size );
	773
	774	HeapManager.Storage.Header * header;
	775	HeapManager.FreeHeader * freeElem;
	776	size_t bsize, alignment;
[d5d3a90]	777	#ifndef __CFA_DEBUG__
	778	bool mapped =
	779	#endif // __CFA_DEBUG__
	780	headers( "calloc", addr, header, freeElem, bsize, alignment );
[95eb7cf]	781	#ifndef __CFA_DEBUG__
[dd23e66]	782
[95eb7cf]	783	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
	784	if ( ! mapped )
	785	#endif // __CFA_DEBUG__
[d5d3a90]	786	// <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined
[1e034d9]	787	// `-header`-addr `-size
[d5d3a90]	788	memset( addr, '\0', size ); // set to zeros
[95eb7cf]	789
	790	header->kind.real.blockSize \|= 2; // mark as zero filled
	791	return addr;
	792	} // callocNoStats
	793
	794
[bcb14b5]	795	static inline void * memalignNoStats( size_t alignment, size_t size ) { // necessary for malloc statistics
[dd23e66]	796	if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER
[d5d3a90]	797
[bcb14b5]	798	#ifdef __CFA_DEBUG__
[b6830d74]	799	checkAlign( alignment ); // check alignment
[bcb14b5]	800	#endif // __CFA_DEBUG__
[c4f68dc]	801
[b6830d74]	802	// if alignment <= default alignment, do normal malloc as two headers are unnecessary
[bcb14b5]	803	if ( unlikely( alignment <= libAlign() ) ) return mallocNoStats( size );
[b6830d74]	804
	805	// Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for
	806	// administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC.
	807	// .-------------v-----------------v----------------v----------,
	808	// \| Real Header \| ... padding ... \| Fake Header \| data ... \|
	809	// `-------------^-----------------^-+--------------^----------'
	810	// \|<--------------------------------' offset/align \|<-- alignment boundary
	811
	812	// subtract libAlign() because it is already the minimum alignment
	813	// add sizeof(Storage) for fake header
[95eb7cf]	814	char * addr = (char *)mallocNoStats( size + alignment - libAlign() + sizeof(HeapManager.Storage) );
[b6830d74]	815
	816	// address in the block of the "next" alignment address
[95eb7cf]	817	char * user = (char *)libCeiling( (uintptr_t)(addr + sizeof(HeapManager.Storage)), alignment );
[b6830d74]	818
	819	// address of header from malloc
[95eb7cf]	820	HeapManager.Storage.Header * realHeader = headerAddr( addr );
[4cf617e]	821	realHeader->kind.real.size = size; // correct size to eliminate above alignment offset
[b6830d74]	822	// address of fake header * before* the alignment location
	823	HeapManager.Storage.Header * fakeHeader = headerAddr( user );
	824	// SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment
	825	fakeHeader->kind.fake.offset = (char )fakeHeader - (char )realHeader;
	826	// SKULLDUGGERY: odd alignment imples fake header
	827	fakeHeader->kind.fake.alignment = alignment \| 1;
	828
	829	return user;
[bcb14b5]	830	} // memalignNoStats
[c4f68dc]	831
	832
[76e2113]	833	static inline void * cmemalignNoStats( size_t alignment, size_t dim, size_t elemSize ) {
	834	size_t size = dim * elemSize;
[dd23e66]	835	if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER
[95eb7cf]	836	char * addr = (char *)memalignNoStats( alignment, size );
[d5d3a90]	837
[95eb7cf]	838	HeapManager.Storage.Header * header;
	839	HeapManager.FreeHeader * freeElem;
	840	size_t bsize;
	841	#ifndef __CFA_DEBUG__
[dd23e66]	842	bool mapped =
	843	#endif // __CFA_DEBUG__
	844	headers( "cmemalign", addr, header, freeElem, bsize, alignment );
	845	#ifndef __CFA_DEBUG__
	846
[95eb7cf]	847	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
	848	if ( ! mapped )
	849	#endif // __CFA_DEBUG__
[dd23e66]	850	// <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined
	851	// `-header`-addr `-size
	852	memset( addr, '\0', size ); // set to zeros
[95eb7cf]	853
[cfbc703d]	854	header->kind.real.blockSize \|= 2; // mark as zero filled
[95eb7cf]	855	return addr;
	856	} // cmemalignNoStats
	857
	858
[e723100]	859	// supported mallopt options
	860	#ifndef M_MMAP_THRESHOLD
	861	#define M_MMAP_THRESHOLD (-1)
	862	#endif // M_TOP_PAD
	863	#ifndef M_TOP_PAD
	864	#define M_TOP_PAD (-2)
	865	#endif // M_TOP_PAD
	866
	867
[c4f68dc]	868	extern "C" {
[61248a4]	869	// Allocates size bytes and returns a pointer to the allocated memory. The contents are undefined. If size is 0,
	870	// then malloc() returns a unique pointer value that can later be successfully passed to free().
[b6830d74]	871	void * malloc( size_t size ) {
[c4f68dc]	872	#ifdef __STATISTICS__
[bcb14b5]	873	__atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST );
	874	__atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	875	#endif // __STATISTICS__
	876
[bcb14b5]	877	return mallocNoStats( size );
	878	} // malloc
[c4f68dc]	879
[76e2113]	880
[61248a4]	881	// Same as malloc() except size bytes is an array of dim elements each of elemSize bytes.
[76e2113]	882	void * aalloc( size_t dim, size_t elemSize ) {
	883	#ifdef __STATISTICS__
	884	__atomic_add_fetch( &aalloc_calls, 1, __ATOMIC_SEQ_CST );
	885	__atomic_add_fetch( &aalloc_storage, dim * elemSize, __ATOMIC_SEQ_CST );
	886	#endif // __STATISTICS__
	887
[1076d05]	888	return mallocNoStats( dim * elemSize );
[76e2113]	889	} // aalloc
	890
	891
[61248a4]	892	// Same as aalloc() with memory set to zero.
[76e2113]	893	void * calloc( size_t dim, size_t elemSize ) {
[c4f68dc]	894	#ifdef __STATISTICS__
[bcb14b5]	895	__atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST );
[76e2113]	896	__atomic_add_fetch( &calloc_storage, dim * elemSize, __ATOMIC_SEQ_CST );
[c4f68dc]	897	#endif // __STATISTICS__
	898
[76e2113]	899	return callocNoStats( dim, elemSize );
[bcb14b5]	900	} // calloc
[c4f68dc]	901
[61248a4]	902	// Change the size of the memory block pointed to by oaddr to size bytes. The contents are undefined. If oaddr is
	903	// 0p, then the call is equivalent to malloc(size), for all values of size; if size is equal to zero, and oaddr is
	904	// not 0p, then the call is equivalent to free(oaddr). Unless oaddr is 0p, it must have been returned by an earlier
	905	// call to malloc(), alloc(), calloc() or realloc(). If the area pointed to was moved, a free(oaddr) is done.
[cfbc703d]	906	void * resize( void * oaddr, size_t size ) {
	907	#ifdef __STATISTICS__
	908	__atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST );
	909	__atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST );
	910	#endif // __STATISTICS__
	911
	912	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
[d5d3a90]	913	if ( unlikely( size == 0 ) ) { free( oaddr ); return 0p; } // special cases
[cfbc703d]	914	if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size );
	915
	916	HeapManager.Storage.Header * header;
	917	HeapManager.FreeHeader * freeElem;
	918	size_t bsize, oalign = 0;
	919	headers( "resize", oaddr, header, freeElem, bsize, oalign );
	920
[76e2113]	921	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
[cfbc703d]	922	// same size, DO NOT preserve STICKY PROPERTIES.
[76e2113]	923	if ( oalign == 0 && size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size
[cfbc703d]	924	header->kind.real.blockSize &= -2; // no alignment and turn off 0 fill
[d5d3a90]	925	header->kind.real.size = size; // reset allocation size
[cfbc703d]	926	return oaddr;
	927	} // if
[0f89d4f]	928
[cfbc703d]	929	// change size, DO NOT preserve STICKY PROPERTIES.
	930	free( oaddr );
[d5d3a90]	931	return mallocNoStats( size ); // create new area
[cfbc703d]	932	} // resize
	933
	934
[61248a4]	935	// Same as resize() but the contents are unchanged in the range from the start of the region up to the minimum of
[cfbc703d]	936	// the old and new sizes.
[95eb7cf]	937	void * realloc( void * oaddr, size_t size ) {
[c4f68dc]	938	#ifdef __STATISTICS__
[bcb14b5]	939	__atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST );
[cfbc703d]	940	__atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	941	#endif // __STATISTICS__
	942
[1f6de372]	943	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
[d5d3a90]	944	if ( unlikely( size == 0 ) ) { free( oaddr ); return 0p; } // special cases
[95eb7cf]	945	if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size );
[c4f68dc]	946
	947	HeapManager.Storage.Header * header;
	948	HeapManager.FreeHeader * freeElem;
[95eb7cf]	949	size_t bsize, oalign = 0;
	950	headers( "realloc", oaddr, header, freeElem, bsize, oalign );
	951
	952	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
[d5d3a90]	953	size_t osize = header->kind.real.size; // old allocation size
	954	bool ozfill = (header->kind.real.blockSize & 2) != 0; // old allocation zero filled
	955	if ( unlikely( size <= odsize ) && size > odsize / 2 ) { // allow up to 50% wasted storage
	956	header->kind.real.size = size; // reset allocation size
	957	if ( unlikely( ozfill ) && size > osize ) { // previous request zero fill and larger ?
	958	memset( (char *)oaddr + osize, (int)'\0', size - osize ); // initialize added storage
	959	} // if
[95eb7cf]	960	return oaddr;
[c4f68dc]	961	} // if
	962
[95eb7cf]	963	// change size and copy old content to new storage
	964
	965	void * naddr;
[d5d3a90]	966	if ( likely( oalign == 0 ) ) { // previous request memalign?
	967	naddr = mallocNoStats( size ); // create new area
[c4f68dc]	968	} else {
[d5d3a90]	969	naddr = memalignNoStats( oalign, size ); // create new aligned area
[c4f68dc]	970	} // if
[1e034d9]	971
[95eb7cf]	972	headers( "realloc", naddr, header, freeElem, bsize, oalign );
[d5d3a90]	973	memcpy( naddr, oaddr, MIN( osize, size ) ); // copy bytes
[95eb7cf]	974	free( oaddr );
[d5d3a90]	975
	976	if ( unlikely( ozfill ) ) { // previous request zero fill ?
	977	header->kind.real.blockSize \|= 2; // mark new request as zero filled
	978	if ( size > osize ) { // previous request larger ?
	979	memset( (char *)naddr + osize, (int)'\0', size - osize ); // initialize added storage
	980	} // if
	981	} // if
[95eb7cf]	982	return naddr;
[b6830d74]	983	} // realloc
[c4f68dc]	984
[c1f38e6c]	985
[61248a4]	986	// Same as malloc() except the memory address is a multiple of alignment, which must be a power of two. (obsolete)
[bcb14b5]	987	void * memalign( size_t alignment, size_t size ) {
[c4f68dc]	988	#ifdef __STATISTICS__
	989	__atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST );
	990	__atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST );
	991	#endif // __STATISTICS__
	992
[95eb7cf]	993	return memalignNoStats( alignment, size );
[bcb14b5]	994	} // memalign
[c4f68dc]	995
[95eb7cf]	996
[76e2113]	997	// Same as aalloc() with memory alignment.
	998	void * amemalign( size_t alignment, size_t dim, size_t elemSize ) {
	999	#ifdef __STATISTICS__
	1000	__atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST );
	1001	__atomic_add_fetch( &cmemalign_storage, dim * elemSize, __ATOMIC_SEQ_CST );
	1002	#endif // __STATISTICS__
	1003
[1076d05]	1004	return memalignNoStats( alignment, dim * elemSize );
[76e2113]	1005	} // amemalign
	1006
	1007
[ca7949b]	1008	// Same as calloc() with memory alignment.
[76e2113]	1009	void * cmemalign( size_t alignment, size_t dim, size_t elemSize ) {
[95eb7cf]	1010	#ifdef __STATISTICS__
	1011	__atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST );
[76e2113]	1012	__atomic_add_fetch( &cmemalign_storage, dim * elemSize, __ATOMIC_SEQ_CST );
[95eb7cf]	1013	#endif // __STATISTICS__
	1014
[76e2113]	1015	return cmemalignNoStats( alignment, dim, elemSize );
[95eb7cf]	1016	} // cmemalign
	1017
[ca7949b]	1018	// Same as memalign(), but ISO/IEC 2011 C11 Section 7.22.2 states: the value of size shall be an integral multiple
	1019	// of alignment. This requirement is universally ignored.
[b6830d74]	1020	void * aligned_alloc( size_t alignment, size_t size ) {
[c4f68dc]	1021	return memalign( alignment, size );
[b6830d74]	1022	} // aligned_alloc
[c4f68dc]	1023
	1024
[ca7949b]	1025	// Allocates size bytes and places the address of the allocated memory in *memptr. The address of the allocated
	1026	// memory shall be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). If size
	1027	// is 0, then posix_memalign() returns either 0p, or a unique pointer value that can later be successfully passed to
	1028	// free(3).
[b6830d74]	1029	int posix_memalign( void ** memptr, size_t alignment, size_t size ) {
[c1f38e6c]	1030	if ( alignment < libAlign() \|\| ! libPow2( alignment ) ) return EINVAL; // check alignment
[c4f68dc]	1031	* memptr = memalign( alignment, size );
	1032	return 0;
[b6830d74]	1033	} // posix_memalign
[c4f68dc]	1034
[ca7949b]	1035	// Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of the
	1036	// page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).
[b6830d74]	1037	void * valloc( size_t size ) {
[c4f68dc]	1038	return memalign( pageSize, size );
[b6830d74]	1039	} // valloc
[c4f68dc]	1040
	1041
[ca7949b]	1042	// Same as valloc but rounds size to multiple of page size.
	1043	void * pvalloc( size_t size ) {
	1044	return memalign( pageSize, libCeiling( size, pageSize ) );
	1045	} // pvalloc
	1046
	1047
	1048	// Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc()
[1076d05]	1049	// or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behaviour occurs. If ptr is
[ca7949b]	1050	// 0p, no operation is performed.
[b6830d74]	1051	void free( void * addr ) {
[c4f68dc]	1052	#ifdef __STATISTICS__
[bcb14b5]	1053	__atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST );
[c4f68dc]	1054	#endif // __STATISTICS__
	1055
[95eb7cf]	1056	if ( unlikely( addr == 0p ) ) { // special case
	1057	// #ifdef __CFA_DEBUG__
	1058	// if ( traceHeap() ) {
	1059	// #define nullmsg "Free( 0x0 ) size:0\n"
[1e034d9]	1060	// // Do not debug print free( 0p ), as it can cause recursive entry from sprintf.
[95eb7cf]	1061	// __cfaabi_dbg_write( nullmsg, sizeof(nullmsg) - 1 );
	1062	// } // if
	1063	// #endif // __CFA_DEBUG__
[c4f68dc]	1064	return;
	1065	} // exit
	1066
	1067	doFree( addr );
[b6830d74]	1068	} // free
[93c2e0a]	1069
[c4f68dc]	1070
[76e2113]	1071	// Returns the alignment of an allocation.
[b6830d74]	1072	size_t malloc_alignment( void * addr ) {
[95eb7cf]	1073	if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment
[1aa6ecb]	1074	HeapManager.Storage.Header * header = headerAddr( addr );
[c4f68dc]	1075	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1076	return header->kind.fake.alignment & -2; // remove flag from value
	1077	} else {
[cfbc703d]	1078	return libAlign(); // minimum alignment
[c4f68dc]	1079	} // if
[bcb14b5]	1080	} // malloc_alignment
[c4f68dc]	1081
[76e2113]	1082	// Set the alignment for an the allocation and return previous alignment or 0 if no alignment.
	1083	size_t $malloc_alignment_set( void * addr, size_t alignment ) {
	1084	if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment
	1085	size_t ret;
	1086	HeapManager.Storage.Header * header = headerAddr( addr );
	1087	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1088	ret = header->kind.fake.alignment & -2; // remove flag from old value
	1089	header->kind.fake.alignment = alignment \| 1; // add flag to new value
	1090	} else {
	1091	ret = 0; // => no alignment to change
	1092	} // if
	1093	return ret;
	1094	} // $malloc_alignment_set
	1095
[c4f68dc]	1096
[76e2113]	1097	// Returns true if the allocation is zero filled, e.g., allocated by calloc().
[b6830d74]	1098	bool malloc_zero_fill( void * addr ) {
[95eb7cf]	1099	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
[1aa6ecb]	1100	HeapManager.Storage.Header * header = headerAddr( addr );
[c4f68dc]	1101	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
[cfbc703d]	1102	header = realHeader( header ); // backup from fake to real header
[c4f68dc]	1103	} // if
[76e2113]	1104	return (header->kind.real.blockSize & 2) != 0; // zero filled ?
[bcb14b5]	1105	} // malloc_zero_fill
[c4f68dc]	1106
[76e2113]	1107	// Set allocation is zero filled and return previous zero filled.
	1108	bool $malloc_zero_fill_set( void * addr ) {
	1109	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
	1110	HeapManager.Storage.Header * header = headerAddr( addr );
	1111	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1112	header = realHeader( header ); // backup from fake to real header
	1113	} // if
	1114	bool ret = (header->kind.real.blockSize & 2) != 0; // zero filled ?
	1115	header->kind.real.blockSize \|= 2; // mark as zero filled
	1116	return ret;
	1117	} // $malloc_zero_fill_set
	1118
[c4f68dc]	1119
[76e2113]	1120	// Returns original total allocation size (not bucket size) => array size is dimension * sizeif(T).
	1121	size_t malloc_size( void * addr ) {
[849fb370]	1122	if ( unlikely( addr == 0p ) ) return 0; // null allocation has zero size
[cfbc703d]	1123	HeapManager.Storage.Header * header = headerAddr( addr );
	1124	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1125	header = realHeader( header ); // backup from fake to real header
	1126	} // if
[9c438546]	1127	return header->kind.real.size;
[76e2113]	1128	} // malloc_size
	1129
	1130	// Set allocation size and return previous size.
	1131	size_t $malloc_size_set( void * addr, size_t size ) {
[849fb370]	1132	if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size
[76e2113]	1133	HeapManager.Storage.Header * header = headerAddr( addr );
	1134	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1135	header = realHeader( header ); // backup from fake to real header
	1136	} // if
[9c438546]	1137	size_t ret = header->kind.real.size;
	1138	header->kind.real.size = size;
[76e2113]	1139	return ret;
	1140	} // $malloc_size_set
[cfbc703d]	1141
	1142
[ca7949b]	1143	// Returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allocated by
	1144	// malloc or a related function.
[95eb7cf]	1145	size_t malloc_usable_size( void * addr ) {
	1146	if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size
	1147	HeapManager.Storage.Header * header;
	1148	HeapManager.FreeHeader * freeElem;
	1149	size_t bsize, alignment;
	1150
	1151	headers( "malloc_usable_size", addr, header, freeElem, bsize, alignment );
[dd23e66]	1152	return dataStorage( bsize, addr, header ); // data storage in bucket
[95eb7cf]	1153	} // malloc_usable_size
	1154
	1155
[ca7949b]	1156	// Prints (on default standard error) statistics about memory allocated by malloc and related functions.
[b6830d74]	1157	void malloc_stats( void ) {
[c4f68dc]	1158	#ifdef __STATISTICS__
[bcb14b5]	1159	printStats();
[95eb7cf]	1160	if ( prtFree() ) prtFree( heapManager );
[c4f68dc]	1161	#endif // __STATISTICS__
[bcb14b5]	1162	} // malloc_stats
[c4f68dc]	1163
[ca7949b]	1164	// Changes the file descripter where malloc_stats() writes statistics.
[95eb7cf]	1165	int malloc_stats_fd( int fd __attribute__(( unused )) ) {
[c4f68dc]	1166	#ifdef __STATISTICS__
[bcb14b5]	1167	int temp = statfd;
	1168	statfd = fd;
	1169	return temp;
[c4f68dc]	1170	#else
[bcb14b5]	1171	return -1;
[c4f68dc]	1172	#endif // __STATISTICS__
[bcb14b5]	1173	} // malloc_stats_fd
[c4f68dc]	1174
[95eb7cf]	1175
[1076d05]	1176	// Adjusts parameters that control the behaviour of the memory-allocation functions (see malloc). The param argument
[ca7949b]	1177	// specifies the parameter to be modified, and value specifies the new value for that parameter.
[95eb7cf]	1178	int mallopt( int option, int value ) {
	1179	choose( option ) {
	1180	case M_TOP_PAD:
[1076d05]	1181	heapExpand = ceiling( value, pageSize ); return 1;
[95eb7cf]	1182	case M_MMAP_THRESHOLD:
	1183	if ( setMmapStart( value ) ) return 1;
[1076d05]	1184	break;
[95eb7cf]	1185	} // switch
	1186	return 0; // error, unsupported
	1187	} // mallopt
	1188
[c1f38e6c]	1189
[ca7949b]	1190	// Attempt to release free memory at the top of the heap (by calling sbrk with a suitable argument).
[95eb7cf]	1191	int malloc_trim( size_t ) {
	1192	return 0; // => impossible to release memory
	1193	} // malloc_trim
	1194
	1195
[ca7949b]	1196	// Exports an XML string that describes the current state of the memory-allocation implementation in the caller.
	1197	// The string is printed on the file stream stream. The exported string includes information about all arenas (see
	1198	// malloc).
[c4f68dc]	1199	int malloc_info( int options, FILE * stream ) {
[95eb7cf]	1200	if ( options != 0 ) { errno = EINVAL; return -1; }
[d46ed6e]	1201	return printStatsXML( stream );
[c4f68dc]	1202	} // malloc_info
	1203
	1204
[ca7949b]	1205	// Records the current state of all malloc internal bookkeeping variables (but not the actual contents of the heap
	1206	// or the state of malloc_hook functions pointers). The state is recorded in a system-dependent opaque data
	1207	// structure dynamically allocated via malloc, and a pointer to that data structure is returned as the function
	1208	// result. (The caller must free this memory.)
[c4f68dc]	1209	void * malloc_get_state( void ) {
[95eb7cf]	1210	return 0p; // unsupported
[c4f68dc]	1211	} // malloc_get_state
	1212
[bcb14b5]	1213
[ca7949b]	1214	// Restores the state of all malloc internal bookkeeping variables to the values recorded in the opaque data
	1215	// structure pointed to by state.
[c4f68dc]	1216	int malloc_set_state( void * ptr ) {
[bcb14b5]	1217	return 0; // unsupported
[c4f68dc]	1218	} // malloc_set_state
	1219	} // extern "C"
	1220
	1221
[95eb7cf]	1222	// Must have CFA linkage to overload with C linkage realloc.
[cfbc703d]	1223	void * resize( void * oaddr, size_t nalign, size_t size ) {
[1e034d9]	1224	#ifdef __STATISTICS__
[cfbc703d]	1225	__atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST );
	1226	__atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST );
[1e034d9]	1227	#endif // __STATISTICS__
[95eb7cf]	1228
[1f6de372]	1229	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
[d5d3a90]	1230	if ( unlikely( size == 0 ) ) { free( oaddr ); return 0p; } // special cases
[cfbc703d]	1231	if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size );
	1232
[c1f38e6c]	1233	if ( unlikely( nalign < libAlign() ) ) nalign = libAlign(); // reset alignment to minimum
[95eb7cf]	1234	#ifdef __CFA_DEBUG__
[1e034d9]	1235	else
[95eb7cf]	1236	checkAlign( nalign ); // check alignment
	1237	#endif // __CFA_DEBUG__
	1238
[cfbc703d]	1239	HeapManager.Storage.Header * header;
	1240	HeapManager.FreeHeader * freeElem;
	1241	size_t bsize, oalign = 0;
	1242	headers( "resize", oaddr, header, freeElem, bsize, oalign );
	1243	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
	1244
	1245	if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match
[c1f38e6c]	1246	if ( oalign > libAlign() ) { // fake header ?
[cfbc703d]	1247	headerAddr( oaddr )->kind.fake.alignment = nalign \| 1; // update alignment (could be the same)
	1248	} // if
	1249	if ( size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size
	1250	header->kind.real.blockSize &= -2; // turn off 0 fill
[dd23e66]	1251	header->kind.real.size = size; // reset allocation size
[cfbc703d]	1252	return oaddr;
	1253	} // if
	1254	} // if
	1255
[dd23e66]	1256	// change size, DO NOT preserve STICKY PROPERTIES.
[cfbc703d]	1257	free( oaddr );
[dd23e66]	1258	return memalignNoStats( nalign, size ); // create new aligned area
[cfbc703d]	1259	} // resize
	1260
	1261
	1262	void * realloc( void * oaddr, size_t nalign, size_t size ) {
[c1f38e6c]	1263	if ( unlikely( nalign < libAlign() ) ) nalign = libAlign(); // reset alignment to minimum
[cfbc703d]	1264	#ifdef __CFA_DEBUG__
	1265	else
	1266	checkAlign( nalign ); // check alignment
	1267	#endif // __CFA_DEBUG__
	1268
[95eb7cf]	1269	HeapManager.Storage.Header * header;
	1270	HeapManager.FreeHeader * freeElem;
	1271	size_t bsize, oalign = 0;
	1272	headers( "realloc", oaddr, header, freeElem, bsize, oalign );
	1273
[cfbc703d]	1274	if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match
[c1f38e6c]	1275	if ( oalign > libAlign() ) { // fake header ?
[cfbc703d]	1276	headerAddr( oaddr )->kind.fake.alignment = nalign \| 1; // update alignment (could be the same)
	1277	} // if
[95eb7cf]	1278	return realloc( oaddr, size );
[1e034d9]	1279	} // if
[95eb7cf]	1280
[cfbc703d]	1281	// change size and copy old content to new storage
	1282
[1e034d9]	1283	#ifdef __STATISTICS__
[cfbc703d]	1284	__atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST );
[95eb7cf]	1285	__atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST );
[1e034d9]	1286	#endif // __STATISTICS__
	1287
[cfbc703d]	1288	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
[d5d3a90]	1289	if ( unlikely( size == 0 ) ) { free( oaddr ); return 0p; } // special cases
[cfbc703d]	1290	if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size );
[95eb7cf]	1291
[dd23e66]	1292	size_t osize = header->kind.real.size; // old allocation size
	1293	bool ozfill = (header->kind.real.blockSize & 2) != 0; // old allocation zero filled
	1294
	1295	void * naddr = memalignNoStats( nalign, size ); // create new aligned area
[95eb7cf]	1296
[1e034d9]	1297	headers( "realloc", naddr, header, freeElem, bsize, oalign );
[d5d3a90]	1298	memcpy( naddr, oaddr, MIN( osize, size ) ); // copy bytes
[1e034d9]	1299	free( oaddr );
[d5d3a90]	1300
	1301	if ( unlikely( ozfill ) ) { // previous request zero fill ?
	1302	header->kind.real.blockSize \|= 2; // mark new request as zero filled
	1303	if ( size > osize ) { // previous request larger ?
	1304	memset( (char *)naddr + osize, (int)'\0', size - osize ); // initialize added storage
	1305	} // if
	1306	} // if
[1e034d9]	1307	return naddr;
[95eb7cf]	1308	} // realloc
	1309
	1310
[c4f68dc]	1311	// Local Variables: //
	1312	// tab-width: 4 //
[f8cd310]	1313	// compile-command: "cfa -nodebug -O2 heap.cfa" //
[c4f68dc]	1314	// End: //

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