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Last change on this file since 6c12fd28 was 1076d05, checked in by Peter A. Buhr <pabuhr@…>, 5 years ago
small code clean ups after complete code walk through
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File size: 49.1 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
[1076d05]	12	// Last Modified On : Wed May 6 17:29:26 2020
	13	// Update Count : 727
[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
[c4f68dc]	22	extern "C" {
	23	#include <sys/mman.h> // mmap, munmap
	24	} // extern "C"
	25
[bcb14b5]	26	#include "bits/align.hfa" // libPow2
	27	#include "bits/defs.hfa" // likely, unlikely
	28	#include "bits/locks.hfa" // __spinlock_t
[73abe95]	29	#include "startup.hfa" // STARTUP_PRIORITY_MEMORY
[1e034d9]	30	//#include "stdlib.hfa" // bsearchl
[c4f68dc]	31	#include "malloc.h"
[1076d05]	32	#include "bitmanip.hfa" // ceiling
[c4f68dc]	33
[95eb7cf]	34	#define MIN(x, y) (y > x ? x : y)
[c4f68dc]	35
[93c2e0a]	36	static bool traceHeap = false;
[d46ed6e]	37
[baf608a]	38	inline bool traceHeap() { return traceHeap; }
[d46ed6e]	39
[93c2e0a]	40	bool traceHeapOn() {
	41	bool temp = traceHeap;
[d46ed6e]	42	traceHeap = true;
	43	return temp;
	44	} // traceHeapOn
	45
[93c2e0a]	46	bool traceHeapOff() {
	47	bool temp = traceHeap;
[d46ed6e]	48	traceHeap = false;
	49	return temp;
	50	} // traceHeapOff
	51
[baf608a]	52	bool traceHeapTerm() { return false; }
	53
[d46ed6e]	54
[95eb7cf]	55	static bool prtFree = false;
[d46ed6e]	56
[95eb7cf]	57	inline bool prtFree() {
	58	return prtFree;
	59	} // prtFree
[5d4fa18]	60
[95eb7cf]	61	bool prtFreeOn() {
	62	bool temp = prtFree;
	63	prtFree = true;
[5d4fa18]	64	return temp;
[95eb7cf]	65	} // prtFreeOn
[5d4fa18]	66
[95eb7cf]	67	bool prtFreeOff() {
	68	bool temp = prtFree;
	69	prtFree = false;
[5d4fa18]	70	return temp;
[95eb7cf]	71	} // prtFreeOff
[5d4fa18]	72
	73
[e723100]	74	enum {
[1e034d9]	75	// Define the default extension heap amount in units of bytes. When the uC++ supplied heap reaches the brk address,
	76	// the brk address is extended by the extension amount.
[e723100]	77	__CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024),
[1e034d9]	78
	79	// Define the mmap crossover point during allocation. Allocations less than this amount are allocated from buckets;
	80	// values greater than or equal to this value are mmap from the operating system.
	81	__CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1),
[e723100]	82	};
	83
	84	size_t default_heap_expansion() __attribute__(( weak )) {
	85	return __CFA_DEFAULT_HEAP_EXPANSION__;
	86	} // default_heap_expansion
	87
[1076d05]	88	size_t default_mmap_start() __attribute__(( weak )) {
	89	return __CFA_DEFAULT_MMAP_START__;
	90	} // default_mmap_start
	91
[e723100]	92
[f0b3f51]	93	#ifdef __CFA_DEBUG__
[93c2e0a]	94	static unsigned int allocFree; // running total of allocations minus frees
[d46ed6e]	95
[95eb7cf]	96	static void prtUnfreed() {
[b6830d74]	97	if ( allocFree != 0 ) {
[d46ed6e]	98	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
[4ea1c6d]	99	char helpText[512];
	100	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"
	101	"Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n",
	102	(long int)getpid(), allocFree, allocFree ); // always print the UNIX pid
	103	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[b6830d74]	104	} // if
[95eb7cf]	105	} // prtUnfreed
[d46ed6e]	106
	107	extern "C" {
[bcb14b5]	108	void heapAppStart() { // called by __cfaabi_appready_startup
	109	allocFree = 0;
	110	} // heapAppStart
	111
	112	void heapAppStop() { // called by __cfaabi_appready_startdown
	113	fclose( stdin ); fclose( stdout );
[95eb7cf]	114	prtUnfreed();
[bcb14b5]	115	} // heapAppStop
[d46ed6e]	116	} // extern "C"
	117	#endif // __CFA_DEBUG__
	118
[1e034d9]	119
[e723100]	120	// statically allocated variables => zero filled.
	121	static size_t pageSize; // architecture pagesize
	122	static size_t heapExpand; // sbrk advance
	123	static size_t mmapStart; // cross over point for mmap
	124	static unsigned int maxBucketsUsed; // maximum number of buckets in use
	125
	126
	127	#define SPINLOCK 0
	128	#define LOCKFREE 1
	129	#define BUCKETLOCK SPINLOCK
	130	#if BUCKETLOCK == LOCKFREE
	131	#include <uStackLF.h>
	132	#endif // LOCKFREE
	133
	134	// Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage.
	135	// Break recusion by hardcoding number of buckets and statically checking number is correct after bucket array defined.
[95eb7cf]	136	enum { NoBucketSizes = 91 }; // number of buckets sizes
[d46ed6e]	137
[c4f68dc]	138	struct HeapManager {
	139	// struct FreeHeader; // forward declaration
	140
	141	struct Storage {
[bcb14b5]	142	struct Header { // header
[c4f68dc]	143	union Kind {
	144	struct RealHeader {
	145	union {
[bcb14b5]	146	struct { // 4-byte word => 8-byte header, 8-byte word => 16-byte header
[f0b3f51]	147	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	148	uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	149	#endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	150
	151	union {
	152	// FreeHeader * home; // allocated block points back to home locations (must overlay alignment)
[cfbc703d]	153	// 2nd low-order bit => zero filled
[c4f68dc]	154	void * home; // allocated block points back to home locations (must overlay alignment)
	155	size_t blockSize; // size for munmap (must overlay alignment)
	156	#if BUCKLOCK == SPINLOCK
	157	Storage * next; // freed block points next freed block of same size
	158	#endif // SPINLOCK
	159	};
	160
[f0b3f51]	161	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	162	uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	163	#endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	164	};
[bcb14b5]	165	// future code
[c4f68dc]	166	#if BUCKLOCK == LOCKFREE
	167	Stack<Storage>::Link next; // freed block points next freed block of same size (double-wide)
	168	#endif // LOCKFREE
	169	};
[93c2e0a]	170	} real; // RealHeader
[c4f68dc]	171	struct FakeHeader {
	172	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
[cfbc703d]	173	// 1st low-order bit => fake header & alignment
	174	uint32_t alignment;
[f0b3f51]	175	#endif // __ORDER_LITTLE_ENDIAN__
[c4f68dc]	176
	177	uint32_t offset;
	178
	179	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	180	uint32_t alignment; // low-order bits of home/blockSize used for tricks
[f0b3f51]	181	#endif // __ORDER_BIG_ENDIAN__
[93c2e0a]	182	} fake; // FakeHeader
	183	} kind; // Kind
[76e2113]	184	size_t size; // allocation size in bytes
[bcb14b5]	185	} header; // Header
[95eb7cf]	186	char pad[libAlign() - sizeof( Header )];
[bcb14b5]	187	char data[0]; // storage
[c4f68dc]	188	}; // Storage
	189
[95eb7cf]	190	static_assert( libAlign() >= sizeof( Storage ), "libAlign() < sizeof( Storage )" );
[c4f68dc]	191
	192	struct FreeHeader {
	193	#if BUCKLOCK == SPINLOCK
[bcb14b5]	194	__spinlock_t lock; // must be first field for alignment
	195	Storage * freeList;
[c4f68dc]	196	#elif BUCKLOCK == LOCKFREE
[bcb14b5]	197	// future code
	198	StackLF<Storage> freeList;
[c4f68dc]	199	#else
[7b149bc]	200	#error undefined lock type for bucket lock
[c4f68dc]	201	#endif // SPINLOCK
[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
[7b149bc]	214	static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; }
[5d4fa18]	215
[e723100]	216
	217	#define FASTLOOKUP
	218	#define __STATISTICS__
[5d4fa18]	219
[1e034d9]	220	// Bucket size must be multiple of 16.
[5d4fa18]	221	// Powers of 2 are common allocation sizes, so make powers of 2 generate the minimum required size.
[e723100]	222	static const unsigned int bucketSizes[] @= { // different bucket sizes
[95eb7cf]	223	16, 32, 48, 64 + sizeof(HeapManager.Storage), // 4
	224	96, 112, 128 + sizeof(HeapManager.Storage), // 3
	225	160, 192, 224, 256 + sizeof(HeapManager.Storage), // 4
	226	320, 384, 448, 512 + sizeof(HeapManager.Storage), // 4
	227	640, 768, 896, 1_024 + sizeof(HeapManager.Storage), // 4
	228	1_536, 2_048 + sizeof(HeapManager.Storage), // 2
	229	2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), // 4
	230	6_144, 8_192 + sizeof(HeapManager.Storage), // 2
	231	9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 16_384 + sizeof(HeapManager.Storage), // 8
	232	18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 32_768 + sizeof(HeapManager.Storage), // 8
	233	36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 65_536 + sizeof(HeapManager.Storage), // 8
	234	73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 131_072 + sizeof(HeapManager.Storage), // 8
	235	147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 262_144 + sizeof(HeapManager.Storage), // 8
	236	294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 524_288 + sizeof(HeapManager.Storage), // 8
	237	655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), // 4
	238	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
	239	2_621_440, 3_145_728, 3_670_016, 4_194_304 + sizeof(HeapManager.Storage), // 4
[5d4fa18]	240	};
[e723100]	241
	242	static_assert( NoBucketSizes == sizeof(bucketSizes) / sizeof(bucketSizes[0]), "size of bucket array wrong" );
	243
[5d4fa18]	244	#ifdef FASTLOOKUP
[a92a4fe]	245	enum { LookupSizes = 65_536 + sizeof(HeapManager.Storage) }; // number of fast lookup sizes
[5d4fa18]	246	static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes
	247	#endif // FASTLOOKUP
	248
[95eb7cf]	249	static int mmapFd = -1; // fake or actual fd for anonymous file
[5d4fa18]	250	#ifdef __CFA_DEBUG__
[93c2e0a]	251	static bool heapBoot = 0; // detect recursion during boot
[5d4fa18]	252	#endif // __CFA_DEBUG__
	253	static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing
	254
[c4f68dc]	255
	256	#ifdef __STATISTICS__
[95eb7cf]	257	// Heap statistics counters.
	258	static unsigned long long int mmap_storage;
[c4f68dc]	259	static unsigned int mmap_calls;
	260	static unsigned long long int munmap_storage;
	261	static unsigned int munmap_calls;
	262	static unsigned long long int sbrk_storage;
	263	static unsigned int sbrk_calls;
	264	static unsigned long long int malloc_storage;
	265	static unsigned int malloc_calls;
	266	static unsigned long long int free_storage;
	267	static unsigned int free_calls;
[76e2113]	268	static unsigned long long int aalloc_storage;
	269	static unsigned int aalloc_calls;
[c4f68dc]	270	static unsigned long long int calloc_storage;
	271	static unsigned int calloc_calls;
	272	static unsigned long long int memalign_storage;
	273	static unsigned int memalign_calls;
[76e2113]	274	static unsigned long long int amemalign_storage;
	275	static unsigned int amemalign_calls;
[c4f68dc]	276	static unsigned long long int cmemalign_storage;
	277	static unsigned int cmemalign_calls;
[cfbc703d]	278	static unsigned long long int resize_storage;
	279	static unsigned int resize_calls;
[c4f68dc]	280	static unsigned long long int realloc_storage;
	281	static unsigned int realloc_calls;
[95eb7cf]	282	// Statistics file descriptor (changed by malloc_stats_fd).
	283	static int statfd = STDERR_FILENO; // default stderr
[c4f68dc]	284
	285	// Use "write" because streams may be shutdown when calls are made.
[d46ed6e]	286	static void printStats() {
[76e2113]	287	char helpText[1024];
[95eb7cf]	288	__cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText),
[bcb14b5]	289	"\nHeap statistics:\n"
	290	" malloc: calls %u / storage %llu\n"
[76e2113]	291	" aalloc: calls %u / storage %llu\n"
[bcb14b5]	292	" calloc: calls %u / storage %llu\n"
	293	" memalign: calls %u / storage %llu\n"
[76e2113]	294	" amemalign: calls %u / storage %llu\n"
[bcb14b5]	295	" cmemalign: calls %u / storage %llu\n"
[cfbc703d]	296	" resize: calls %u / storage %llu\n"
[bcb14b5]	297	" realloc: calls %u / storage %llu\n"
	298	" free: calls %u / storage %llu\n"
	299	" mmap: calls %u / storage %llu\n"
	300	" munmap: calls %u / storage %llu\n"
	301	" sbrk: calls %u / storage %llu\n",
	302	malloc_calls, malloc_storage,
[76e2113]	303	aalloc_calls, calloc_storage,
[bcb14b5]	304	calloc_calls, calloc_storage,
	305	memalign_calls, memalign_storage,
[76e2113]	306	amemalign_calls, amemalign_storage,
[bcb14b5]	307	cmemalign_calls, cmemalign_storage,
[cfbc703d]	308	resize_calls, resize_storage,
[bcb14b5]	309	realloc_calls, realloc_storage,
	310	free_calls, free_storage,
	311	mmap_calls, mmap_storage,
	312	munmap_calls, munmap_storage,
	313	sbrk_calls, sbrk_storage
[c4f68dc]	314	);
[d46ed6e]	315	} // printStats
[c4f68dc]	316
[bcb14b5]	317	static int printStatsXML( FILE * stream ) { // see malloc_info
[76e2113]	318	char helpText[1024];
[b6830d74]	319	int len = snprintf( helpText, sizeof(helpText),
[c4f68dc]	320	"<malloc version=\"1\">\n"
	321	"<heap nr=\"0\">\n"
	322	"<sizes>\n"
	323	"</sizes>\n"
	324	"<total type=\"malloc\" count=\"%u\" size=\"%llu\"/>\n"
[76e2113]	325	"<total type=\"aalloc\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	326	"<total type=\"calloc\" count=\"%u\" size=\"%llu\"/>\n"
	327	"<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n"
[76e2113]	328	"<total type=\"amemalign\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	329	"<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n"
[cfbc703d]	330	"<total type=\"resize\" count=\"%u\" size=\"%llu\"/>\n"
[c4f68dc]	331	"<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n"
	332	"<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n"
	333	"<total type=\"mmap\" count=\"%u\" size=\"%llu\"/>\n"
	334	"<total type=\"munmap\" count=\"%u\" size=\"%llu\"/>\n"
	335	"<total type=\"sbrk\" count=\"%u\" size=\"%llu\"/>\n"
	336	"</malloc>",
	337	malloc_calls, malloc_storage,
[76e2113]	338	aalloc_calls, aalloc_storage,
[c4f68dc]	339	calloc_calls, calloc_storage,
	340	memalign_calls, memalign_storage,
[76e2113]	341	amemalign_calls, amemalign_storage,
[c4f68dc]	342	cmemalign_calls, cmemalign_storage,
[cfbc703d]	343	resize_calls, resize_storage,
[c4f68dc]	344	realloc_calls, realloc_storage,
	345	free_calls, free_storage,
	346	mmap_calls, mmap_storage,
	347	munmap_calls, munmap_storage,
	348	sbrk_calls, sbrk_storage
	349	);
[95eb7cf]	350	__cfaabi_bits_write( fileno( stream ), helpText, len ); // ensures all bytes written or exit
	351	return len;
[d46ed6e]	352	} // printStatsXML
[c4f68dc]	353	#endif // __STATISTICS__
	354
[95eb7cf]	355
[98d6965d]	356	// static inline void noMemory() {
	357	// abort( "Heap memory exhausted at %zu bytes.\n"
	358	// "Possible cause is very large memory allocation and/or large amount of unfreed storage allocated by the program or system/library routines.",
	359	// ((char )(sbrk( 0 )) - (char )(heapManager.heapBegin)) );
	360	// } // noMemory
[c4f68dc]	361
	362
[1e034d9]	363	// thunk problem
	364	size_t Bsearchl( unsigned int key, const unsigned int * vals, size_t dim ) {
	365	size_t l = 0, m, h = dim;
	366	while ( l < h ) {
	367	m = (l + h) / 2;
	368	if ( (unsigned int &)(vals[m]) < key ) { // cast away const
	369	l = m + 1;
	370	} else {
	371	h = m;
	372	} // if
	373	} // while
	374	return l;
	375	} // Bsearchl
	376
	377
[95eb7cf]	378	static inline bool setMmapStart( size_t value ) { // true => mmapped, false => sbrk
[1076d05]	379	if ( value < pageSize \|\| bucketSizes[NoBucketSizes - 1] < value ) return false;
[95eb7cf]	380	mmapStart = value; // set global
	381
	382	// find the closest bucket size less than or equal to the mmapStart size
[1e034d9]	383	maxBucketsUsed = Bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search
[95eb7cf]	384	assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ?
	385	assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?
[1076d05]	386	return true;
[95eb7cf]	387	} // setMmapStart
	388
	389
[cfbc703d]	390	// <-------+----------------------------------------------------> bsize (bucket size)
	391	// \|header \|addr
	392	//==================================================================================
	393	// align/offset \|
	394	// <-----------------<------------+-----------------------------> bsize (bucket size)
	395	// \|fake-header \| addr
	396	#define headerAddr( addr ) ((HeapManager.Storage.Header )( (char )addr - sizeof(HeapManager.Storage) ))
	397	#define realHeader( header ) ((HeapManager.Storage.Header )((char )header - header->kind.fake.offset))
	398
	399	// <-------<<--------------------- dsize ---------------------->> bsize (bucket size)
	400	// \|header \|addr
	401	//==================================================================================
	402	// align/offset \|
	403	// <------------------------------<<---------- dsize --------->>> bsize (bucket size)
	404	// \|fake-header \|addr
	405	#define dataStorage( bsize, addr, header ) (bsize - ( (char )addr - (char )header ))
	406
	407
	408	static inline void checkAlign( size_t alignment ) {
	409	if ( alignment < libAlign() \|\| ! libPow2( alignment ) ) {
	410	abort( "Alignment %zu for memory allocation is less than %d and/or not a power of 2.", alignment, libAlign() );
	411	} // if
	412	} // checkAlign
	413
	414
[e3fea42]	415	static inline void checkHeader( bool check, const char name[], void * addr ) {
[b6830d74]	416	if ( unlikely( check ) ) { // bad address ?
[c4f68dc]	417	abort( "Attempt to %s storage %p with address outside the heap.\n"
[bcb14b5]	418	"Possible cause is duplicate free on same block or overwriting of memory.",
	419	name, addr );
[b6830d74]	420	} // if
[c4f68dc]	421	} // checkHeader
	422
[95eb7cf]	423
	424	static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & alignment ) {
[b6830d74]	425	if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ?
[c4f68dc]	426	alignment = header->kind.fake.alignment & -2; // remove flag from value
	427	#ifdef __CFA_DEBUG__
	428	checkAlign( alignment ); // check alignment
	429	#endif // __CFA_DEBUG__
[cfbc703d]	430	header = realHeader( header ); // backup from fake to real header
[b6830d74]	431	} // if
[c4f68dc]	432	} // fakeHeader
	433
[95eb7cf]	434
[e3fea42]	435	static inline bool headers( const char name[] __attribute__(( unused )), void * addr, HeapManager.Storage.Header & header, HeapManager.FreeHeader & freeElem, size_t & size, size_t & alignment ) with ( heapManager ) {
[b6830d74]	436	header = headerAddr( addr );
[c4f68dc]	437
[b6830d74]	438	if ( unlikely( heapEnd < addr ) ) { // mmapped ?
[95eb7cf]	439	fakeHeader( header, alignment );
[c4f68dc]	440	size = header->kind.real.blockSize & -3; // mmap size
	441	return true;
[b6830d74]	442	} // if
[c4f68dc]	443
	444	#ifdef __CFA_DEBUG__
[1076d05]	445	checkHeader( addr < heapBegin, name, addr ); // bad low address ?
[c4f68dc]	446	#endif // __CFA_DEBUG__
[b6830d74]	447
[bcb14b5]	448	// header may be safe to dereference
[95eb7cf]	449	fakeHeader( header, alignment );
[c4f68dc]	450	#ifdef __CFA_DEBUG__
[bcb14b5]	451	checkHeader( header < (HeapManager.Storage.Header )heapBegin \|\| (HeapManager.Storage.Header )heapEnd < header, name, addr ); // bad address ? (offset could be + or -)
[c4f68dc]	452	#endif // __CFA_DEBUG__
	453
[bcb14b5]	454	freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3);
[c4f68dc]	455	#ifdef __CFA_DEBUG__
[bcb14b5]	456	if ( freeElem < &freeLists[0] \|\| &freeLists[NoBucketSizes] <= freeElem ) {
	457	abort( "Attempt to %s storage %p with corrupted header.\n"
	458	"Possible cause is duplicate free on same block or overwriting of header information.",
	459	name, addr );
	460	} // if
[c4f68dc]	461	#endif // __CFA_DEBUG__
[bcb14b5]	462	size = freeElem->blockSize;
	463	return false;
[c4f68dc]	464	} // headers
	465
	466
	467	static inline void * extend( size_t size ) with ( heapManager ) {
[b6830d74]	468	lock( extlock __cfaabi_dbg_ctx2 );
	469	ptrdiff_t rem = heapRemaining - size;
	470	if ( rem < 0 ) {
[c4f68dc]	471	// If the size requested is bigger than the current remaining storage, increase the size of the heap.
	472
	473	size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() );
	474	if ( sbrk( increase ) == (void *)-1 ) {
	475	unlock( extlock );
	476	errno = ENOMEM;
[95eb7cf]	477	return 0p;
[c4f68dc]	478	} // if
[bcb14b5]	479	#ifdef __STATISTICS__
[c4f68dc]	480	sbrk_calls += 1;
	481	sbrk_storage += increase;
[bcb14b5]	482	#endif // __STATISTICS__
	483	#ifdef __CFA_DEBUG__
[c4f68dc]	484	// Set new memory to garbage so subsequent uninitialized usages might fail.
	485	memset( (char *)heapEnd + heapRemaining, '\377', increase );
[bcb14b5]	486	#endif // __CFA_DEBUG__
[c4f68dc]	487	rem = heapRemaining + increase - size;
[b6830d74]	488	} // if
[c4f68dc]	489
[b6830d74]	490	HeapManager.Storage * block = (HeapManager.Storage *)heapEnd;
	491	heapRemaining = rem;
	492	heapEnd = (char *)heapEnd + size;
	493	unlock( extlock );
	494	return block;
[c4f68dc]	495	} // extend
	496
	497
	498	static inline void * doMalloc( size_t size ) with ( heapManager ) {
[7b149bc]	499	HeapManager.Storage * block; // pointer to new block of storage
[c4f68dc]	500
[b6830d74]	501	// Look up size in the size list. Make sure the user request includes space for the header that must be allocated
	502	// along with the block and is a multiple of the alignment size.
[c4f68dc]	503
[1076d05]	504	if ( unlikely( size > ULONG_MAX - sizeof(HeapManager.Storage) ) ) return 0p;
[b6830d74]	505	size_t tsize = size + sizeof(HeapManager.Storage);
	506	if ( likely( tsize < mmapStart ) ) { // small size => sbrk
[e723100]	507	size_t posn;
	508	#ifdef FASTLOOKUP
	509	if ( tsize < LookupSizes ) posn = lookup[tsize];
	510	else
	511	#endif // FASTLOOKUP
	512	posn = Bsearchl( (unsigned int)tsize, bucketSizes, (size_t)maxBucketsUsed );
	513	HeapManager.FreeHeader * freeElem = &freeLists[posn];
	514	// #ifdef FASTLOOKUP
	515	// if ( tsize < LookupSizes )
	516	// freeElem = &freeLists[lookup[tsize]];
	517	// else
	518	// #endif // FASTLOOKUP
	519	// freeElem = bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
	520	// HeapManager.FreeHeader * freeElem =
	521	// #ifdef FASTLOOKUP
	522	// tsize < LookupSizes ? &freeLists[lookup[tsize]] :
	523	// #endif // FASTLOOKUP
	524	// bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
[c4f68dc]	525	assert( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ?
	526	assert( tsize <= freeElem->blockSize ); // search failure ?
	527	tsize = freeElem->blockSize; // total space needed for request
	528
	529	// Spin until the lock is acquired for this particular size of block.
	530
	531	#if defined( SPINLOCK )
[bcb14b5]	532	lock( freeElem->lock __cfaabi_dbg_ctx2 );
	533	block = freeElem->freeList; // remove node from stack
[c4f68dc]	534	#else
[bcb14b5]	535	block = freeElem->freeList.pop();
[c4f68dc]	536	#endif // SPINLOCK
[95eb7cf]	537	if ( unlikely( block == 0p ) ) { // no free block ?
[c4f68dc]	538	#if defined( SPINLOCK )
	539	unlock( freeElem->lock );
	540	#endif // SPINLOCK
[bcb14b5]	541
[c4f68dc]	542	// Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more
	543	// and then carve it off.
	544
	545	block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call
[95eb7cf]	546	if ( unlikely( block == 0p ) ) return 0p;
[1e034d9]	547	#if defined( SPINLOCK )
[c4f68dc]	548	} else {
	549	freeElem->freeList = block->header.kind.real.next;
	550	unlock( freeElem->lock );
[1e034d9]	551	#endif // SPINLOCK
[c4f68dc]	552	} // if
	553
	554	block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size
[bcb14b5]	555	} else { // large size => mmap
[1076d05]	556	if ( unlikely( size > ULONG_MAX - pageSize ) ) return 0p;
[c4f68dc]	557	tsize = libCeiling( tsize, pageSize ); // must be multiple of page size
	558	#ifdef __STATISTICS__
[bcb14b5]	559	__atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST );
	560	__atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST );
[c4f68dc]	561	#endif // __STATISTICS__
	562	block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| MAP_ANONYMOUS, mmapFd, 0 );
	563	if ( block == (HeapManager.Storage *)MAP_FAILED ) {
	564	// Do not call strerror( errno ) as it may call malloc.
	565	abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu error:%d.", &heapManager, tsize, errno );
	566	} // if
[bcb14b5]	567	#ifdef __CFA_DEBUG__
[c4f68dc]	568	// Set new memory to garbage so subsequent uninitialized usages might fail.
	569	memset( block, '\377', tsize );
[bcb14b5]	570	#endif // __CFA_DEBUG__
[c4f68dc]	571	block->header.kind.real.blockSize = tsize; // storage size for munmap
[bcb14b5]	572	} // if
[c4f68dc]	573
[76e2113]	574	block->header.size = size; // store allocation size
[95eb7cf]	575	void * addr = &(block->data); // adjust off header to user bytes
[c4f68dc]	576
	577	#ifdef __CFA_DEBUG__
[95eb7cf]	578	assert( ((uintptr_t)addr & (libAlign() - 1)) == 0 ); // minimum alignment ?
[bcb14b5]	579	__atomic_add_fetch( &allocFree, tsize, __ATOMIC_SEQ_CST );
	580	if ( traceHeap() ) {
	581	enum { BufferSize = 64 };
	582	char helpText[BufferSize];
[95eb7cf]	583	int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", addr, size, tsize );
	584	// int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", addr, size );
	585	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[bcb14b5]	586	} // if
[c4f68dc]	587	#endif // __CFA_DEBUG__
	588
[95eb7cf]	589	return addr;
[c4f68dc]	590	} // doMalloc
	591
	592
	593	static inline void doFree( void * addr ) with ( heapManager ) {
	594	#ifdef __CFA_DEBUG__
[95eb7cf]	595	if ( unlikely( heapManager.heapBegin == 0p ) ) {
[bcb14b5]	596	abort( "doFree( %p ) : internal error, called before heap is initialized.", addr );
	597	} // if
[c4f68dc]	598	#endif // __CFA_DEBUG__
	599
[b6830d74]	600	HeapManager.Storage.Header * header;
	601	HeapManager.FreeHeader * freeElem;
	602	size_t size, alignment; // not used (see realloc)
[c4f68dc]	603
[b6830d74]	604	if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ?
[c4f68dc]	605	#ifdef __STATISTICS__
[bcb14b5]	606	__atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST );
	607	__atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	608	#endif // __STATISTICS__
	609	if ( munmap( header, size ) == -1 ) {
	610	#ifdef __CFA_DEBUG__
	611	abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n"
[bcb14b5]	612	"Possible cause is invalid pointer.",
	613	addr );
[c4f68dc]	614	#endif // __CFA_DEBUG__
	615	} // if
[bcb14b5]	616	} else {
[c4f68dc]	617	#ifdef __CFA_DEBUG__
[bcb14b5]	618	// Set free memory to garbage so subsequent usages might fail.
	619	memset( ((HeapManager.Storage *)header)->data, '\377', freeElem->blockSize - sizeof( HeapManager.Storage ) );
[c4f68dc]	620	#endif // __CFA_DEBUG__
	621
	622	#ifdef __STATISTICS__
[bcb14b5]	623	free_storage += size;
[c4f68dc]	624	#endif // __STATISTICS__
	625	#if defined( SPINLOCK )
[bcb14b5]	626	lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock
	627	header->kind.real.next = freeElem->freeList; // push on stack
	628	freeElem->freeList = (HeapManager.Storage *)header;
	629	unlock( freeElem->lock ); // release spin lock
[c4f68dc]	630	#else
[bcb14b5]	631	freeElem->freeList.push( (HeapManager.Storage )header );
[c4f68dc]	632	#endif // SPINLOCK
[bcb14b5]	633	} // if
[c4f68dc]	634
	635	#ifdef __CFA_DEBUG__
[bcb14b5]	636	__atomic_add_fetch( &allocFree, -size, __ATOMIC_SEQ_CST );
	637	if ( traceHeap() ) {
[7b149bc]	638	enum { BufferSize = 64 };
	639	char helpText[BufferSize];
[bcb14b5]	640	int len = snprintf( helpText, sizeof(helpText), "Free( %p ) size:%zu\n", addr, size );
[95eb7cf]	641	__cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug
[bcb14b5]	642	} // if
[c4f68dc]	643	#endif // __CFA_DEBUG__
	644	} // doFree
	645
	646
[95eb7cf]	647	size_t prtFree( HeapManager & manager ) with ( manager ) {
[b6830d74]	648	size_t total = 0;
[c4f68dc]	649	#ifdef __STATISTICS__
[95eb7cf]	650	__cfaabi_bits_acquire();
	651	__cfaabi_bits_print_nolock( STDERR_FILENO, "\nBin lists (bin size : free blocks on list)\n" );
[c4f68dc]	652	#endif // __STATISTICS__
[b6830d74]	653	for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) {
[d46ed6e]	654	size_t size = freeLists[i].blockSize;
	655	#ifdef __STATISTICS__
	656	unsigned int N = 0;
	657	#endif // __STATISTICS__
[b6830d74]	658
[d46ed6e]	659	#if defined( SPINLOCK )
[95eb7cf]	660	for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0p; p = p->header.kind.real.next ) {
[d46ed6e]	661	#else
[95eb7cf]	662	for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0p; p = p->header.kind.real.next.top ) {
[d46ed6e]	663	#endif // SPINLOCK
	664	total += size;
	665	#ifdef __STATISTICS__
	666	N += 1;
	667	#endif // __STATISTICS__
[b6830d74]	668	} // for
	669
[d46ed6e]	670	#ifdef __STATISTICS__
[95eb7cf]	671	__cfaabi_bits_print_nolock( STDERR_FILENO, "%7zu, %-7u ", size, N );
	672	if ( (i + 1) % 8 == 0 ) __cfaabi_bits_print_nolock( STDERR_FILENO, "\n" );
[d46ed6e]	673	#endif // __STATISTICS__
	674	} // for
	675	#ifdef __STATISTICS__
[95eb7cf]	676	__cfaabi_bits_print_nolock( STDERR_FILENO, "\ntotal free blocks:%zu\n", total );
	677	__cfaabi_bits_release();
[d46ed6e]	678	#endif // __STATISTICS__
	679	return (char )heapEnd - (char )heapBegin - total;
[95eb7cf]	680	} // prtFree
	681
	682
	683	static void ?{}( HeapManager & manager ) with ( manager ) {
	684	pageSize = sysconf( _SC_PAGESIZE );
	685
	686	for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists
	687	freeLists[i].blockSize = bucketSizes[i];
	688	} // for
	689
	690	#ifdef FASTLOOKUP
	691	unsigned int idx = 0;
	692	for ( unsigned int i = 0; i < LookupSizes; i += 1 ) {
	693	if ( i > bucketSizes[idx] ) idx += 1;
	694	lookup[i] = idx;
	695	} // for
	696	#endif // FASTLOOKUP
	697
[1076d05]	698	if ( ! setMmapStart( default_mmap_start() ) ) {
[95eb7cf]	699	abort( "HeapManager : internal error, mmap start initialization failure." );
	700	} // if
	701	heapExpand = default_heap_expansion();
	702
[1e034d9]	703	char * end = (char *)sbrk( 0 );
[1076d05]	704	heapBegin = heapEnd = sbrk( (char *)libCeiling( (long unsigned int)end, libAlign() ) - end ); // move start of heap to multiple of alignment
[95eb7cf]	705	} // HeapManager
	706
	707
	708	static void ^?{}( HeapManager & ) {
	709	#ifdef __STATISTICS__
[baf608a]	710	if ( traceHeapTerm() ) {
	711	printStats();
	712	// if ( prtfree() ) prtFree( heapManager, true );
	713	} // if
[95eb7cf]	714	#endif // __STATISTICS__
	715	} // ~HeapManager
	716
	717
	718	static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) ));
	719	void memory_startup( void ) {
	720	#ifdef __CFA_DEBUG__
	721	if ( unlikely( heapBoot ) ) { // check for recursion during system boot
	722	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
	723	abort( "boot() : internal error, recursively invoked during system boot." );
	724	} // if
	725	heapBoot = true;
	726	#endif // __CFA_DEBUG__
	727
	728	//assert( heapManager.heapBegin != 0 );
	729	//heapManager{};
[1076d05]	730	if ( heapManager.heapBegin == 0p ) heapManager{}; // sanity check
[95eb7cf]	731	} // memory_startup
	732
	733	static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) ));
	734	void memory_shutdown( void ) {
	735	^heapManager{};
	736	} // memory_shutdown
[c4f68dc]	737
[bcb14b5]	738
	739	static inline void * mallocNoStats( size_t size ) { // necessary for malloc statistics
[7117ac3]	740	//assert( heapManager.heapBegin != 0 );
[95eb7cf]	741	if ( unlikely( heapManager.heapBegin == 0p ) ) heapManager{}; // called before memory_startup ?
[76e2113]	742	#if __SIZEOF_POINTER__ == 8
	743	verify( size < ((typeof(size_t))1 << 48) );
	744	#endif // __SIZEOF_POINTER__ == 8
[95eb7cf]	745	void * addr = doMalloc( size );
	746	if ( unlikely( addr == 0p ) ) errno = ENOMEM; // POSIX
	747	return addr;
[bcb14b5]	748	} // mallocNoStats
[c4f68dc]	749
	750
[76e2113]	751	static inline void * callocNoStats( size_t dim, size_t elemSize ) {
	752	size_t size = dim * elemSize;
[95eb7cf]	753	char * addr = (char *)mallocNoStats( size );
	754	if ( unlikely( addr == 0p ) ) return 0p;
	755
	756	HeapManager.Storage.Header * header;
	757	HeapManager.FreeHeader * freeElem;
	758	size_t bsize, alignment;
	759	bool mapped __attribute__(( unused )) = headers( "calloc", addr, header, freeElem, bsize, alignment );
	760	#ifndef __CFA_DEBUG__
	761	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
	762	if ( ! mapped )
	763	#endif // __CFA_DEBUG__
[1e034d9]	764	// Zero entire data space even when > than size => realloc without a new allocation and zero fill works.
	765	// <-------00000000000000000000000000000000000000000000000000000> bsize (bucket size)
	766	// `-header`-addr `-size
[95eb7cf]	767	memset( addr, '\0', bsize - sizeof(HeapManager.Storage) ); // set to zeros
	768
	769	header->kind.real.blockSize \|= 2; // mark as zero filled
	770	return addr;
	771	} // callocNoStats
	772
	773
[bcb14b5]	774	static inline void * memalignNoStats( size_t alignment, size_t size ) { // necessary for malloc statistics
	775	#ifdef __CFA_DEBUG__
[b6830d74]	776	checkAlign( alignment ); // check alignment
[bcb14b5]	777	#endif // __CFA_DEBUG__
[c4f68dc]	778
[b6830d74]	779	// if alignment <= default alignment, do normal malloc as two headers are unnecessary
[bcb14b5]	780	if ( unlikely( alignment <= libAlign() ) ) return mallocNoStats( size );
[b6830d74]	781
	782	// Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for
	783	// administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC.
	784	// .-------------v-----------------v----------------v----------,
	785	// \| Real Header \| ... padding ... \| Fake Header \| data ... \|
	786	// `-------------^-----------------^-+--------------^----------'
	787	// \|<--------------------------------' offset/align \|<-- alignment boundary
	788
	789	// subtract libAlign() because it is already the minimum alignment
	790	// add sizeof(Storage) for fake header
[95eb7cf]	791	char * addr = (char *)mallocNoStats( size + alignment - libAlign() + sizeof(HeapManager.Storage) );
	792	if ( unlikely( addr == 0p ) ) return addr;
[b6830d74]	793
	794	// address in the block of the "next" alignment address
[95eb7cf]	795	char * user = (char *)libCeiling( (uintptr_t)(addr + sizeof(HeapManager.Storage)), alignment );
[b6830d74]	796
	797	// address of header from malloc
[95eb7cf]	798	HeapManager.Storage.Header * realHeader = headerAddr( addr );
[b6830d74]	799	// address of fake header * before* the alignment location
	800	HeapManager.Storage.Header * fakeHeader = headerAddr( user );
	801	// SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment
	802	fakeHeader->kind.fake.offset = (char )fakeHeader - (char )realHeader;
	803	// SKULLDUGGERY: odd alignment imples fake header
	804	fakeHeader->kind.fake.alignment = alignment \| 1;
	805
	806	return user;
[bcb14b5]	807	} // memalignNoStats
[c4f68dc]	808
	809
[76e2113]	810	static inline void * cmemalignNoStats( size_t alignment, size_t dim, size_t elemSize ) {
	811	size_t size = dim * elemSize;
[95eb7cf]	812	char * addr = (char *)memalignNoStats( alignment, size );
	813	if ( unlikely( addr == 0p ) ) return 0p;
	814	HeapManager.Storage.Header * header;
	815	HeapManager.FreeHeader * freeElem;
	816	size_t bsize;
	817	bool mapped __attribute__(( unused )) = headers( "cmemalign", addr, header, freeElem, bsize, alignment );
	818	#ifndef __CFA_DEBUG__
	819	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
	820	if ( ! mapped )
	821	#endif // __CFA_DEBUG__
	822	memset( addr, '\0', dataStorage( bsize, addr, header ) ); // set to zeros
	823
[cfbc703d]	824	header->kind.real.blockSize \|= 2; // mark as zero filled
[95eb7cf]	825	return addr;
	826	} // cmemalignNoStats
	827
	828
[e723100]	829	// supported mallopt options
	830	#ifndef M_MMAP_THRESHOLD
	831	#define M_MMAP_THRESHOLD (-1)
	832	#endif // M_TOP_PAD
	833	#ifndef M_TOP_PAD
	834	#define M_TOP_PAD (-2)
	835	#endif // M_TOP_PAD
	836
	837
[c4f68dc]	838	extern "C" {
[61248a4]	839	// Allocates size bytes and returns a pointer to the allocated memory. The contents are undefined. If size is 0,
	840	// then malloc() returns a unique pointer value that can later be successfully passed to free().
[b6830d74]	841	void * malloc( size_t size ) {
[c4f68dc]	842	#ifdef __STATISTICS__
[bcb14b5]	843	__atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST );
	844	__atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	845	#endif // __STATISTICS__
	846
[bcb14b5]	847	return mallocNoStats( size );
	848	} // malloc
[c4f68dc]	849
[76e2113]	850
[61248a4]	851	// Same as malloc() except size bytes is an array of dim elements each of elemSize bytes.
[76e2113]	852	void * aalloc( size_t dim, size_t elemSize ) {
	853	#ifdef __STATISTICS__
	854	__atomic_add_fetch( &aalloc_calls, 1, __ATOMIC_SEQ_CST );
	855	__atomic_add_fetch( &aalloc_storage, dim * elemSize, __ATOMIC_SEQ_CST );
	856	#endif // __STATISTICS__
	857
[1076d05]	858	return mallocNoStats( dim * elemSize );
[76e2113]	859	} // aalloc
	860
	861
[61248a4]	862	// Same as aalloc() with memory set to zero.
[76e2113]	863	void * calloc( size_t dim, size_t elemSize ) {
[c4f68dc]	864	#ifdef __STATISTICS__
[bcb14b5]	865	__atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST );
[76e2113]	866	__atomic_add_fetch( &calloc_storage, dim * elemSize, __ATOMIC_SEQ_CST );
[c4f68dc]	867	#endif // __STATISTICS__
	868
[76e2113]	869	return callocNoStats( dim, elemSize );
[bcb14b5]	870	} // calloc
[c4f68dc]	871
[61248a4]	872	// Change the size of the memory block pointed to by oaddr to size bytes. The contents are undefined. If oaddr is
	873	// 0p, then the call is equivalent to malloc(size), for all values of size; if size is equal to zero, and oaddr is
	874	// not 0p, then the call is equivalent to free(oaddr). Unless oaddr is 0p, it must have been returned by an earlier
	875	// call to malloc(), alloc(), calloc() or realloc(). If the area pointed to was moved, a free(oaddr) is done.
[cfbc703d]	876	void * resize( void * oaddr, size_t size ) {
	877	#ifdef __STATISTICS__
	878	__atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST );
	879	__atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST );
	880	#endif // __STATISTICS__
	881
	882	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
	883	if ( unlikely( size == 0 ) ) { free( oaddr ); return mallocNoStats( size ); } // special cases
	884	if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size );
	885
	886	HeapManager.Storage.Header * header;
	887	HeapManager.FreeHeader * freeElem;
	888	size_t bsize, oalign = 0;
	889	headers( "resize", oaddr, header, freeElem, bsize, oalign );
	890
[76e2113]	891	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
[cfbc703d]	892	// same size, DO NOT preserve STICKY PROPERTIES.
[76e2113]	893	if ( oalign == 0 && size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size
[cfbc703d]	894	header->kind.real.blockSize &= -2; // no alignment and turn off 0 fill
	895	return oaddr;
	896	} // if
	897
	898	// change size, DO NOT preserve STICKY PROPERTIES.
	899	free( oaddr );
[1076d05]	900	void * naddr = mallocNoStats( size ); // create new area
[cfbc703d]	901	return naddr;
	902	} // resize
	903
	904
[61248a4]	905	// Same as resize() but the contents are unchanged in the range from the start of the region up to the minimum of
[cfbc703d]	906	// the old and new sizes.
[95eb7cf]	907	void * realloc( void * oaddr, size_t size ) {
[c4f68dc]	908	#ifdef __STATISTICS__
[bcb14b5]	909	__atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST );
[cfbc703d]	910	__atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	911	#endif // __STATISTICS__
	912
[1f6de372]	913	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
	914	if ( unlikely( size == 0 ) ) { free( oaddr ); return mallocNoStats( size ); } // special cases
[95eb7cf]	915	if ( unlikely( oaddr == 0p ) ) return mallocNoStats( size );
[c4f68dc]	916
	917	HeapManager.Storage.Header * header;
	918	HeapManager.FreeHeader * freeElem;
[95eb7cf]	919	size_t bsize, oalign = 0;
	920	headers( "realloc", oaddr, header, freeElem, bsize, oalign );
	921
	922	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
	923	if ( size <= odsize && odsize <= size * 2 ) { // allow up to 50% wasted storage in smaller size
	924	// Do not know size of original allocation => cannot do 0 fill for any additional space because do not know
	925	// where to start filling, i.e., do not overwrite existing values in space.
	926	return oaddr;
[c4f68dc]	927	} // if
	928
[95eb7cf]	929	// change size and copy old content to new storage
	930
	931	void * naddr;
	932	if ( unlikely( oalign != 0 ) ) { // previous request memalign?
	933	if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill
	934	naddr = cmemalignNoStats( oalign, 1, size ); // create new aligned area
	935	} else {
	936	naddr = memalignNoStats( oalign, size ); // create new aligned area
	937	} // if
[c4f68dc]	938	} else {
[95eb7cf]	939	if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill
	940	naddr = callocNoStats( 1, size ); // create new area
	941	} else {
	942	naddr = mallocNoStats( size ); // create new area
	943	} // if
[c4f68dc]	944	} // if
[95eb7cf]	945	if ( unlikely( naddr == 0p ) ) return 0p;
[1e034d9]	946
[95eb7cf]	947	headers( "realloc", naddr, header, freeElem, bsize, oalign );
	948	size_t ndsize = dataStorage( bsize, naddr, header ); // data storage avilable in bucket
	949	// To preserve prior fill, the entire bucket must be copied versus the size.
	950	memcpy( naddr, oaddr, MIN( odsize, ndsize ) ); // copy bytes
	951	free( oaddr );
	952	return naddr;
[b6830d74]	953	} // realloc
[c4f68dc]	954
[61248a4]	955	// Same as malloc() except the memory address is a multiple of alignment, which must be a power of two. (obsolete)
[bcb14b5]	956	void * memalign( size_t alignment, size_t size ) {
[c4f68dc]	957	#ifdef __STATISTICS__
	958	__atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST );
	959	__atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST );
	960	#endif // __STATISTICS__
	961
[95eb7cf]	962	return memalignNoStats( alignment, size );
[bcb14b5]	963	} // memalign
[c4f68dc]	964
[95eb7cf]	965
[76e2113]	966	// Same as aalloc() with memory alignment.
	967	void * amemalign( size_t alignment, size_t dim, size_t elemSize ) {
	968	#ifdef __STATISTICS__
	969	__atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST );
	970	__atomic_add_fetch( &cmemalign_storage, dim * elemSize, __ATOMIC_SEQ_CST );
	971	#endif // __STATISTICS__
	972
[1076d05]	973	return memalignNoStats( alignment, dim * elemSize );
[76e2113]	974	} // amemalign
	975
	976
[ca7949b]	977	// Same as calloc() with memory alignment.
[76e2113]	978	void * cmemalign( size_t alignment, size_t dim, size_t elemSize ) {
[95eb7cf]	979	#ifdef __STATISTICS__
	980	__atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST );
[76e2113]	981	__atomic_add_fetch( &cmemalign_storage, dim * elemSize, __ATOMIC_SEQ_CST );
[95eb7cf]	982	#endif // __STATISTICS__
	983
[76e2113]	984	return cmemalignNoStats( alignment, dim, elemSize );
[95eb7cf]	985	} // cmemalign
	986
[ca7949b]	987	// Same as memalign(), but ISO/IEC 2011 C11 Section 7.22.2 states: the value of size shall be an integral multiple
	988	// of alignment. This requirement is universally ignored.
[b6830d74]	989	void * aligned_alloc( size_t alignment, size_t size ) {
[c4f68dc]	990	return memalign( alignment, size );
[b6830d74]	991	} // aligned_alloc
[c4f68dc]	992
	993
[ca7949b]	994	// Allocates size bytes and places the address of the allocated memory in *memptr. The address of the allocated
	995	// memory shall be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). If size
	996	// is 0, then posix_memalign() returns either 0p, or a unique pointer value that can later be successfully passed to
	997	// free(3).
[b6830d74]	998	int posix_memalign( void ** memptr, size_t alignment, size_t size ) {
[bcb14b5]	999	if ( alignment < sizeof(void *) \|\| ! libPow2( alignment ) ) return EINVAL; // check alignment
[c4f68dc]	1000	* memptr = memalign( alignment, size );
[95eb7cf]	1001	if ( unlikely( * memptr == 0p ) ) return ENOMEM;
[c4f68dc]	1002	return 0;
[b6830d74]	1003	} // posix_memalign
[c4f68dc]	1004
[ca7949b]	1005	// Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of the
	1006	// page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).
[b6830d74]	1007	void * valloc( size_t size ) {
[c4f68dc]	1008	return memalign( pageSize, size );
[b6830d74]	1009	} // valloc
[c4f68dc]	1010
	1011
[ca7949b]	1012	// Same as valloc but rounds size to multiple of page size.
	1013	void * pvalloc( size_t size ) {
	1014	return memalign( pageSize, libCeiling( size, pageSize ) );
	1015	} // pvalloc
	1016
	1017
	1018	// Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc()
[1076d05]	1019	// or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behaviour occurs. If ptr is
[ca7949b]	1020	// 0p, no operation is performed.
[b6830d74]	1021	void free( void * addr ) {
[c4f68dc]	1022	#ifdef __STATISTICS__
[bcb14b5]	1023	__atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST );
[c4f68dc]	1024	#endif // __STATISTICS__
	1025
[95eb7cf]	1026	if ( unlikely( addr == 0p ) ) { // special case
	1027	// #ifdef __CFA_DEBUG__
	1028	// if ( traceHeap() ) {
	1029	// #define nullmsg "Free( 0x0 ) size:0\n"
[1e034d9]	1030	// // Do not debug print free( 0p ), as it can cause recursive entry from sprintf.
[95eb7cf]	1031	// __cfaabi_dbg_write( nullmsg, sizeof(nullmsg) - 1 );
	1032	// } // if
	1033	// #endif // __CFA_DEBUG__
[c4f68dc]	1034	return;
	1035	} // exit
	1036
	1037	doFree( addr );
[b6830d74]	1038	} // free
[93c2e0a]	1039
[c4f68dc]	1040
[76e2113]	1041	// Returns the alignment of an allocation.
[b6830d74]	1042	size_t malloc_alignment( void * addr ) {
[95eb7cf]	1043	if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment
[1aa6ecb]	1044	HeapManager.Storage.Header * header = headerAddr( addr );
[c4f68dc]	1045	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1046	return header->kind.fake.alignment & -2; // remove flag from value
	1047	} else {
[cfbc703d]	1048	return libAlign(); // minimum alignment
[c4f68dc]	1049	} // if
[bcb14b5]	1050	} // malloc_alignment
[c4f68dc]	1051
[76e2113]	1052	// Set the alignment for an the allocation and return previous alignment or 0 if no alignment.
	1053	size_t $malloc_alignment_set( void * addr, size_t alignment ) {
	1054	if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment
	1055	size_t ret;
	1056	HeapManager.Storage.Header * header = headerAddr( addr );
	1057	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1058	ret = header->kind.fake.alignment & -2; // remove flag from old value
	1059	header->kind.fake.alignment = alignment \| 1; // add flag to new value
	1060	} else {
	1061	ret = 0; // => no alignment to change
	1062	} // if
	1063	return ret;
	1064	} // $malloc_alignment_set
	1065
[c4f68dc]	1066
[76e2113]	1067	// Returns true if the allocation is zero filled, e.g., allocated by calloc().
[b6830d74]	1068	bool malloc_zero_fill( void * addr ) {
[95eb7cf]	1069	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
[1aa6ecb]	1070	HeapManager.Storage.Header * header = headerAddr( addr );
[c4f68dc]	1071	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
[cfbc703d]	1072	header = realHeader( header ); // backup from fake to real header
[c4f68dc]	1073	} // if
[76e2113]	1074	return (header->kind.real.blockSize & 2) != 0; // zero filled ?
[bcb14b5]	1075	} // malloc_zero_fill
[c4f68dc]	1076
[76e2113]	1077	// Set allocation is zero filled and return previous zero filled.
	1078	bool $malloc_zero_fill_set( void * addr ) {
	1079	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
	1080	HeapManager.Storage.Header * header = headerAddr( addr );
	1081	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1082	header = realHeader( header ); // backup from fake to real header
	1083	} // if
	1084	bool ret = (header->kind.real.blockSize & 2) != 0; // zero filled ?
	1085	header->kind.real.blockSize \|= 2; // mark as zero filled
	1086	return ret;
	1087	} // $malloc_zero_fill_set
	1088
[c4f68dc]	1089
[76e2113]	1090	// Returns original total allocation size (not bucket size) => array size is dimension * sizeif(T).
	1091	size_t malloc_size( void * addr ) {
[cfbc703d]	1092	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
	1093	HeapManager.Storage.Header * header = headerAddr( addr );
	1094	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1095	header = realHeader( header ); // backup from fake to real header
	1096	} // if
[76e2113]	1097	return header->size;
	1098	} // malloc_size
	1099
	1100	// Set allocation size and return previous size.
	1101	size_t $malloc_size_set( void * addr, size_t size ) {
	1102	if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill
	1103	HeapManager.Storage.Header * header = headerAddr( addr );
	1104	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1105	header = realHeader( header ); // backup from fake to real header
	1106	} // if
	1107	size_t ret = header->size;
	1108	header->size = size;
	1109	return ret;
	1110	} // $malloc_size_set
[cfbc703d]	1111
	1112
[ca7949b]	1113	// Returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allocated by
	1114	// malloc or a related function.
[95eb7cf]	1115	size_t malloc_usable_size( void * addr ) {
	1116	if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size
	1117	HeapManager.Storage.Header * header;
	1118	HeapManager.FreeHeader * freeElem;
	1119	size_t bsize, alignment;
	1120
	1121	headers( "malloc_usable_size", addr, header, freeElem, bsize, alignment );
	1122	return dataStorage( bsize, addr, header ); // data storage in bucket
	1123	} // malloc_usable_size
	1124
	1125
[ca7949b]	1126	// Prints (on default standard error) statistics about memory allocated by malloc and related functions.
[b6830d74]	1127	void malloc_stats( void ) {
[c4f68dc]	1128	#ifdef __STATISTICS__
[bcb14b5]	1129	printStats();
[95eb7cf]	1130	if ( prtFree() ) prtFree( heapManager );
[c4f68dc]	1131	#endif // __STATISTICS__
[bcb14b5]	1132	} // malloc_stats
[c4f68dc]	1133
[ca7949b]	1134	// Changes the file descripter where malloc_stats() writes statistics.
[95eb7cf]	1135	int malloc_stats_fd( int fd __attribute__(( unused )) ) {
[c4f68dc]	1136	#ifdef __STATISTICS__
[bcb14b5]	1137	int temp = statfd;
	1138	statfd = fd;
	1139	return temp;
[c4f68dc]	1140	#else
[bcb14b5]	1141	return -1;
[c4f68dc]	1142	#endif // __STATISTICS__
[bcb14b5]	1143	} // malloc_stats_fd
[c4f68dc]	1144
[95eb7cf]	1145
[1076d05]	1146	// Adjusts parameters that control the behaviour of the memory-allocation functions (see malloc). The param argument
[ca7949b]	1147	// specifies the parameter to be modified, and value specifies the new value for that parameter.
[95eb7cf]	1148	int mallopt( int option, int value ) {
	1149	choose( option ) {
	1150	case M_TOP_PAD:
[1076d05]	1151	heapExpand = ceiling( value, pageSize ); return 1;
[95eb7cf]	1152	case M_MMAP_THRESHOLD:
	1153	if ( setMmapStart( value ) ) return 1;
[1076d05]	1154	break;
[95eb7cf]	1155	} // switch
	1156	return 0; // error, unsupported
	1157	} // mallopt
	1158
[ca7949b]	1159	// Attempt to release free memory at the top of the heap (by calling sbrk with a suitable argument).
[95eb7cf]	1160	int malloc_trim( size_t ) {
	1161	return 0; // => impossible to release memory
	1162	} // malloc_trim
	1163
	1164
[ca7949b]	1165	// Exports an XML string that describes the current state of the memory-allocation implementation in the caller.
	1166	// The string is printed on the file stream stream. The exported string includes information about all arenas (see
	1167	// malloc).
[c4f68dc]	1168	int malloc_info( int options, FILE * stream ) {
[95eb7cf]	1169	if ( options != 0 ) { errno = EINVAL; return -1; }
[d46ed6e]	1170	return printStatsXML( stream );
[c4f68dc]	1171	} // malloc_info
	1172
	1173
[ca7949b]	1174	// Records the current state of all malloc internal bookkeeping variables (but not the actual contents of the heap
	1175	// or the state of malloc_hook functions pointers). The state is recorded in a system-dependent opaque data
	1176	// structure dynamically allocated via malloc, and a pointer to that data structure is returned as the function
	1177	// result. (The caller must free this memory.)
[c4f68dc]	1178	void * malloc_get_state( void ) {
[95eb7cf]	1179	return 0p; // unsupported
[c4f68dc]	1180	} // malloc_get_state
	1181
[bcb14b5]	1182
[ca7949b]	1183	// Restores the state of all malloc internal bookkeeping variables to the values recorded in the opaque data
	1184	// structure pointed to by state.
[c4f68dc]	1185	int malloc_set_state( void * ptr ) {
[bcb14b5]	1186	return 0; // unsupported
[c4f68dc]	1187	} // malloc_set_state
	1188	} // extern "C"
	1189
	1190
[95eb7cf]	1191	// Must have CFA linkage to overload with C linkage realloc.
[cfbc703d]	1192	void * resize( void * oaddr, size_t nalign, size_t size ) {
[1e034d9]	1193	#ifdef __STATISTICS__
[cfbc703d]	1194	__atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST );
	1195	__atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST );
[1e034d9]	1196	#endif // __STATISTICS__
[95eb7cf]	1197
[1f6de372]	1198	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
[cfbc703d]	1199	if ( unlikely( size == 0 ) ) { free( oaddr ); return memalignNoStats( nalign, size ); } // special cases
	1200	if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size );
	1201
[95eb7cf]	1202
[1e034d9]	1203	if ( unlikely( nalign == 0 ) ) nalign = libAlign(); // reset alignment to minimum
[95eb7cf]	1204	#ifdef __CFA_DEBUG__
[1e034d9]	1205	else
[95eb7cf]	1206	checkAlign( nalign ); // check alignment
	1207	#endif // __CFA_DEBUG__
	1208
[cfbc703d]	1209	HeapManager.Storage.Header * header;
	1210	HeapManager.FreeHeader * freeElem;
	1211	size_t bsize, oalign = 0;
	1212	headers( "resize", oaddr, header, freeElem, bsize, oalign );
	1213	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
	1214
	1215	if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match
	1216	if ( oalign >= libAlign() ) { // fake header ?
	1217	headerAddr( oaddr )->kind.fake.alignment = nalign \| 1; // update alignment (could be the same)
	1218	} // if
	1219	if ( size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size
	1220	header->kind.real.blockSize &= -2; // turn off 0 fill
	1221	return oaddr;
	1222	} // if
	1223	} // if
	1224
	1225	// change size
	1226
	1227	void * naddr;
	1228	if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill
	1229	naddr = cmemalignNoStats( nalign, 1, size ); // create new aligned area
	1230	} else {
	1231	naddr = memalignNoStats( nalign, size ); // create new aligned area
	1232	} // if
	1233
	1234	free( oaddr );
	1235	return naddr;
	1236	} // resize
	1237
	1238
	1239	void * realloc( void * oaddr, size_t nalign, size_t size ) {
	1240	if ( unlikely( nalign == 0 ) ) nalign = libAlign(); // reset alignment to minimum
	1241	#ifdef __CFA_DEBUG__
	1242	else
	1243	checkAlign( nalign ); // check alignment
	1244	#endif // __CFA_DEBUG__
	1245
[95eb7cf]	1246	HeapManager.Storage.Header * header;
	1247	HeapManager.FreeHeader * freeElem;
	1248	size_t bsize, oalign = 0;
	1249	headers( "realloc", oaddr, header, freeElem, bsize, oalign );
[1e034d9]	1250	size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket
[95eb7cf]	1251
[cfbc703d]	1252	if ( oalign <= nalign && (uintptr_t)oaddr % nalign == 0 ) { // <= alignment and new alignment happens to match
	1253	if ( oalign >= libAlign() ) { // fake header ?
	1254	headerAddr( oaddr )->kind.fake.alignment = nalign \| 1; // update alignment (could be the same)
	1255	} // if
[95eb7cf]	1256	return realloc( oaddr, size );
[1e034d9]	1257	} // if
[95eb7cf]	1258
[cfbc703d]	1259	// change size and copy old content to new storage
	1260
[1e034d9]	1261	#ifdef __STATISTICS__
[cfbc703d]	1262	__atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST );
[95eb7cf]	1263	__atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST );
[1e034d9]	1264	#endif // __STATISTICS__
	1265
[cfbc703d]	1266	// If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned.
	1267	if ( unlikely( size == 0 ) ) { free( oaddr ); return memalignNoStats( nalign, size ); } // special cases
	1268	if ( unlikely( oaddr == 0p ) ) return memalignNoStats( nalign, size );
[95eb7cf]	1269
[1e034d9]	1270	void * naddr;
	1271	if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill
	1272	naddr = cmemalignNoStats( nalign, 1, size ); // create new aligned area
	1273	} else {
	1274	naddr = memalignNoStats( nalign, size ); // create new aligned area
	1275	} // if
[95eb7cf]	1276
[1e034d9]	1277	headers( "realloc", naddr, header, freeElem, bsize, oalign );
[cfbc703d]	1278	size_t ndsize = dataStorage( bsize, naddr, header ); // data storage available in bucket
[95eb7cf]	1279	// To preserve prior fill, the entire bucket must be copied versus the size.
[1e034d9]	1280	memcpy( naddr, oaddr, MIN( odsize, ndsize ) ); // copy bytes
	1281	free( oaddr );
	1282	return naddr;
[95eb7cf]	1283	} // realloc
	1284
	1285
[c4f68dc]	1286	// Local Variables: //
	1287	// tab-width: 4 //
[f8cd310]	1288	// compile-command: "cfa -nodebug -O2 heap.cfa" //
[c4f68dc]	1289	// End: //

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