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Last change on this file since 3e93c00 was a92a4fe, checked in by Peter A. Buhr <pabuhr@…>, 6 years ago
fix patch when using sizeof in enum
Property mode set to `100644`
File size: 40.4 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
[a92a4fe]	12	// Last Modified On : Wed Jul 24 13:12:45 2019
	13	// Update Count : 550
[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
	20	extern "C" {
	21	#include <sys/mman.h> // mmap, munmap
	22	} // extern "C"
	23
[b6830d74]	24	// #comment TD : Many of these should be merged into math I believe
[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
[bcb14b5]	29	#include "stdlib.hfa" // bsearchl
[c4f68dc]	30	#include "malloc.h"
	31
	32
[93c2e0a]	33	static bool traceHeap = false;
[d46ed6e]	34
[93c2e0a]	35	inline bool traceHeap() {
[d46ed6e]	36	return traceHeap;
	37	} // traceHeap
	38
[93c2e0a]	39	bool traceHeapOn() {
	40	bool temp = traceHeap;
[d46ed6e]	41	traceHeap = true;
	42	return temp;
	43	} // traceHeapOn
	44
[93c2e0a]	45	bool traceHeapOff() {
	46	bool temp = traceHeap;
[d46ed6e]	47	traceHeap = false;
	48	return temp;
	49	} // traceHeapOff
	50
	51
[93c2e0a]	52	static bool checkFree = false;
[d46ed6e]	53
[93c2e0a]	54	inline bool checkFree() {
[5d4fa18]	55	return checkFree;
	56	} // checkFree
	57
[93c2e0a]	58	bool checkFreeOn() {
	59	bool temp = checkFree;
[5d4fa18]	60	checkFree = true;
	61	return temp;
	62	} // checkFreeOn
	63
[93c2e0a]	64	bool checkFreeOff() {
	65	bool temp = checkFree;
[5d4fa18]	66	checkFree = false;
	67	return temp;
	68	} // checkFreeOff
	69
	70
[93c2e0a]	71	// static bool traceHeapTerm = false;
[5d4fa18]	72
[93c2e0a]	73	// inline bool traceHeapTerm() {
[5d4fa18]	74	// return traceHeapTerm;
	75	// } // traceHeapTerm
[d46ed6e]	76
[93c2e0a]	77	// bool traceHeapTermOn() {
	78	// bool temp = traceHeapTerm;
[5d4fa18]	79	// traceHeapTerm = true;
[d46ed6e]	80	// return temp;
[5d4fa18]	81	// } // traceHeapTermOn
[d46ed6e]	82
[93c2e0a]	83	// bool traceHeapTermOff() {
	84	// bool temp = traceHeapTerm;
[5d4fa18]	85	// traceHeapTerm = false;
[d46ed6e]	86	// return temp;
[5d4fa18]	87	// } // traceHeapTermOff
[d46ed6e]	88
	89
[e723100]	90	enum {
	91	__CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1),
	92	__CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024),
	93	};
	94
	95	size_t default_mmap_start() __attribute__(( weak )) {
	96	return __CFA_DEFAULT_MMAP_START__;
	97	} // default_mmap_start
	98
	99	size_t default_heap_expansion() __attribute__(( weak )) {
	100	return __CFA_DEFAULT_HEAP_EXPANSION__;
	101	} // default_heap_expansion
	102
	103
[f0b3f51]	104	#ifdef __CFA_DEBUG__
[93c2e0a]	105	static unsigned int allocFree; // running total of allocations minus frees
[d46ed6e]	106
	107	static void checkUnfreed() {
[b6830d74]	108	if ( allocFree != 0 ) {
[d46ed6e]	109	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
	110	// char helpText[512];
[93c2e0a]	111	// int len = snprintf( helpText, sizeof(helpText), "CFA warning (UNIX pid:%ld) : program terminating with %u(0x%x) bytes of storage allocated but not freed.\n"
[d46ed6e]	112	// "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n",
[93c2e0a]	113	// (long int)getpid(), allocFree, allocFree ); // always print the UNIX pid
[d46ed6e]	114	// __cfaabi_dbg_bits_write( helpText, len );
[b6830d74]	115	} // if
[d46ed6e]	116	} // checkUnfreed
	117
	118	extern "C" {
[bcb14b5]	119	void heapAppStart() { // called by __cfaabi_appready_startup
	120	allocFree = 0;
	121	} // heapAppStart
	122
	123	void heapAppStop() { // called by __cfaabi_appready_startdown
	124	fclose( stdin ); fclose( stdout );
	125	checkUnfreed();
	126	} // heapAppStop
[d46ed6e]	127	} // extern "C"
	128	#endif // __CFA_DEBUG__
	129
[e723100]	130	// statically allocated variables => zero filled.
	131	static size_t pageSize; // architecture pagesize
	132	static size_t heapExpand; // sbrk advance
	133	static size_t mmapStart; // cross over point for mmap
	134	static unsigned int maxBucketsUsed; // maximum number of buckets in use
	135
	136
	137	// #comment TD : This defined is significantly different from the __ALIGN__ define from locks.hfa
	138	#define ALIGN 16
	139
	140	#define SPINLOCK 0
	141	#define LOCKFREE 1
	142	#define BUCKETLOCK SPINLOCK
	143	#if BUCKETLOCK == LOCKFREE
	144	#include <uStackLF.h>
	145	#endif // LOCKFREE
	146
	147	// Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage.
	148	// Break recusion by hardcoding number of buckets and statically checking number is correct after bucket array defined.
	149	enum { NoBucketSizes = 93 }; // number of buckets sizes
[d46ed6e]	150
[c4f68dc]	151	struct HeapManager {
	152	// struct FreeHeader; // forward declaration
	153
	154	struct Storage {
[bcb14b5]	155	struct Header { // header
[c4f68dc]	156	union Kind {
	157	struct RealHeader {
	158	union {
[bcb14b5]	159	struct { // 4-byte word => 8-byte header, 8-byte word => 16-byte header
[f0b3f51]	160	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	161	uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	162	#endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	163
	164	union {
	165	// FreeHeader * home; // allocated block points back to home locations (must overlay alignment)
	166	void * home; // allocated block points back to home locations (must overlay alignment)
	167	size_t blockSize; // size for munmap (must overlay alignment)
	168	#if BUCKLOCK == SPINLOCK
	169	Storage * next; // freed block points next freed block of same size
	170	#endif // SPINLOCK
	171	};
	172
[f0b3f51]	173	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	174	uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header
[bcb14b5]	175	#endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4
[c4f68dc]	176	};
[bcb14b5]	177	// future code
[c4f68dc]	178	#if BUCKLOCK == LOCKFREE
	179	Stack<Storage>::Link next; // freed block points next freed block of same size (double-wide)
	180	#endif // LOCKFREE
	181	};
[93c2e0a]	182	} real; // RealHeader
[c4f68dc]	183	struct FakeHeader {
	184	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	185	uint32_t alignment; // low-order bits of home/blockSize used for tricks
[f0b3f51]	186	#endif // __ORDER_LITTLE_ENDIAN__
[c4f68dc]	187
	188	uint32_t offset;
	189
	190	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	191	uint32_t alignment; // low-order bits of home/blockSize used for tricks
[f0b3f51]	192	#endif // __ORDER_BIG_ENDIAN__
[93c2e0a]	193	} fake; // FakeHeader
	194	} kind; // Kind
[bcb14b5]	195	} header; // Header
	196	char pad[ALIGN - sizeof( Header )];
	197	char data[0]; // storage
[c4f68dc]	198	}; // Storage
	199
	200	static_assert( ALIGN >= sizeof( Storage ), "ALIGN < sizeof( Storage )" );
	201
	202	struct FreeHeader {
	203	#if BUCKLOCK == SPINLOCK
[bcb14b5]	204	__spinlock_t lock; // must be first field for alignment
	205	Storage * freeList;
[c4f68dc]	206	#elif BUCKLOCK == LOCKFREE
[bcb14b5]	207	// future code
	208	StackLF<Storage> freeList;
[c4f68dc]	209	#else
[7b149bc]	210	#error undefined lock type for bucket lock
[c4f68dc]	211	#endif // SPINLOCK
[bcb14b5]	212	size_t blockSize; // size of allocations on this list
[c4f68dc]	213	}; // FreeHeader
	214
	215	// must be first fields for alignment
	216	__spinlock_t extlock; // protects allocation-buffer extension
	217	FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes
	218
	219	void * heapBegin; // start of heap
	220	void * heapEnd; // logical end of heap
	221	size_t heapRemaining; // amount of storage not allocated in the current chunk
	222	}; // HeapManager
	223
[7b149bc]	224	static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; }
[5d4fa18]	225
[e723100]	226
	227	#define FASTLOOKUP
	228	#define __STATISTICS__
[5d4fa18]	229
	230	// Powers of 2 are common allocation sizes, so make powers of 2 generate the minimum required size.
[e723100]	231	static const unsigned int bucketSizes[] @= { // different bucket sizes
[b6830d74]	232	16, 32, 48, 64,
	233	64 + sizeof(HeapManager.Storage), 96, 112, 128, 128 + sizeof(HeapManager.Storage), 160, 192, 224,
	234	256 + sizeof(HeapManager.Storage), 320, 384, 448, 512 + sizeof(HeapManager.Storage), 640, 768, 896,
	235	1_024 + sizeof(HeapManager.Storage), 1_536, 2_048 + sizeof(HeapManager.Storage), 2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), 6_144,
	236	8_192 + sizeof(HeapManager.Storage), 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360,
	237	16_384 + sizeof(HeapManager.Storage), 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720,
	238	32_768 + sizeof(HeapManager.Storage), 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440,
	239	65_536 + sizeof(HeapManager.Storage), 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880,
	240	131_072 + sizeof(HeapManager.Storage), 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760,
	241	262_144 + sizeof(HeapManager.Storage), 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520,
	242	524_288 + sizeof(HeapManager.Storage), 655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), 1_179_648, 1_310_720, 1_441_792,
	243	1_572_864, 1_703_936, 1_835_008, 1_966_080, 2_097_152 + sizeof(HeapManager.Storage), 2_621_440, 3_145_728, 3_670_016,
	244	4_194_304 + sizeof(HeapManager.Storage)
[5d4fa18]	245	};
[e723100]	246
	247	static_assert( NoBucketSizes == sizeof(bucketSizes) / sizeof(bucketSizes[0]), "size of bucket array wrong" );
	248
[5d4fa18]	249	#ifdef FASTLOOKUP
[a92a4fe]	250	enum { LookupSizes = 65_536 + sizeof(HeapManager.Storage) }; // number of fast lookup sizes
[5d4fa18]	251	static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes
	252	#endif // FASTLOOKUP
	253	static int mmapFd = -1; // fake or actual fd for anonymous file
	254
	255
	256	#ifdef __CFA_DEBUG__
[93c2e0a]	257	static bool heapBoot = 0; // detect recursion during boot
[5d4fa18]	258	#endif // __CFA_DEBUG__
	259	static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing
	260
[b6830d74]	261	// #comment TD : The return type of this function should be commented
[93c2e0a]	262	static inline bool setMmapStart( size_t value ) {
[bcb14b5]	263	if ( value < pageSize \|\| bucketSizes[NoBucketSizes - 1] < value ) return true;
[b6830d74]	264	mmapStart = value; // set global
	265
	266	// find the closest bucket size less than or equal to the mmapStart size
	267	maxBucketsUsed = bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search
	268	assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ?
	269	assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ?
	270	return false;
[d46ed6e]	271	} // setMmapStart
	272
	273
	274	static void ?{}( HeapManager & manager ) with ( manager ) {
[b6830d74]	275	pageSize = sysconf( _SC_PAGESIZE );
[73abe95]	276
[b6830d74]	277	for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists
[d46ed6e]	278	freeLists[i].blockSize = bucketSizes[i];
[b6830d74]	279	} // for
[d46ed6e]	280
	281	#ifdef FASTLOOKUP
[b6830d74]	282	unsigned int idx = 0;
	283	for ( unsigned int i = 0; i < LookupSizes; i += 1 ) {
[d46ed6e]	284	if ( i > bucketSizes[idx] ) idx += 1;
	285	lookup[i] = idx;
[b6830d74]	286	} // for
[d46ed6e]	287	#endif // FASTLOOKUP
	288
[b6830d74]	289	if ( setMmapStart( default_mmap_start() ) ) {
[d46ed6e]	290	abort( "HeapManager : internal error, mmap start initialization failure." );
[b6830d74]	291	} // if
	292	heapExpand = default_heap_expansion();
[d46ed6e]	293
[b6830d74]	294	char * End = (char *)sbrk( 0 );
	295	sbrk( (char *)libCeiling( (long unsigned int)End, libAlign() ) - End ); // move start of heap to multiple of alignment
	296	heapBegin = heapEnd = sbrk( 0 ); // get new start point
[7b149bc]	297	} // HeapManager
[d46ed6e]	298
	299
	300	static void ^?{}( HeapManager & ) {
	301	#ifdef __STATISTICS__
[5d4fa18]	302	// if ( traceHeapTerm() ) {
[d46ed6e]	303	// printStats();
[5d4fa18]	304	// if ( checkfree() ) checkFree( heapManager, true );
[d46ed6e]	305	// } // if
	306	#endif // __STATISTICS__
[7b149bc]	307	} // ~HeapManager
[d46ed6e]	308
	309
	310	static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) ));
	311	void memory_startup( void ) {
	312	#ifdef __CFA_DEBUG__
[bcb14b5]	313	if ( unlikely( heapBoot ) ) { // check for recursion during system boot
[d46ed6e]	314	// DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT.
	315	abort( "boot() : internal error, recursively invoked during system boot." );
	316	} // if
	317	heapBoot = true;
	318	#endif // __CFA_DEBUG__
[c4f68dc]	319
[7117ac3]	320	//assert( heapManager.heapBegin != 0 );
	321	//heapManager{};
	322	if ( heapManager.heapBegin == 0 ) heapManager{};
[d46ed6e]	323	} // memory_startup
[c4f68dc]	324
[d46ed6e]	325	static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) ));
	326	void memory_shutdown( void ) {
	327	^heapManager{};
	328	} // memory_shutdown
	329
[c4f68dc]	330
	331	#ifdef __STATISTICS__
[d46ed6e]	332	static unsigned long long int mmap_storage; // heap statistics counters
[c4f68dc]	333	static unsigned int mmap_calls;
	334	static unsigned long long int munmap_storage;
	335	static unsigned int munmap_calls;
	336	static unsigned long long int sbrk_storage;
	337	static unsigned int sbrk_calls;
	338	static unsigned long long int malloc_storage;
	339	static unsigned int malloc_calls;
	340	static unsigned long long int free_storage;
	341	static unsigned int free_calls;
	342	static unsigned long long int calloc_storage;
	343	static unsigned int calloc_calls;
	344	static unsigned long long int memalign_storage;
	345	static unsigned int memalign_calls;
	346	static unsigned long long int cmemalign_storage;
	347	static unsigned int cmemalign_calls;
	348	static unsigned long long int realloc_storage;
	349	static unsigned int realloc_calls;
[d46ed6e]	350
	351	static int statfd; // statistics file descriptor (changed by malloc_stats_fd)
[c4f68dc]	352
	353
	354	// Use "write" because streams may be shutdown when calls are made.
[d46ed6e]	355	static void printStats() {
[b6830d74]	356	char helpText[512];
[93c2e0a]	357	__cfaabi_dbg_bits_print_buffer( helpText, sizeof(helpText),
[bcb14b5]	358	"\nHeap statistics:\n"
	359	" malloc: calls %u / storage %llu\n"
	360	" calloc: calls %u / storage %llu\n"
	361	" memalign: calls %u / storage %llu\n"
	362	" cmemalign: calls %u / storage %llu\n"
	363	" realloc: calls %u / storage %llu\n"
	364	" free: calls %u / storage %llu\n"
	365	" mmap: calls %u / storage %llu\n"
	366	" munmap: calls %u / storage %llu\n"
	367	" sbrk: calls %u / storage %llu\n",
	368	malloc_calls, malloc_storage,
	369	calloc_calls, calloc_storage,
	370	memalign_calls, memalign_storage,
	371	cmemalign_calls, cmemalign_storage,
	372	realloc_calls, realloc_storage,
	373	free_calls, free_storage,
	374	mmap_calls, mmap_storage,
	375	munmap_calls, munmap_storage,
	376	sbrk_calls, sbrk_storage
[c4f68dc]	377	);
[d46ed6e]	378	} // printStats
[c4f68dc]	379
[bcb14b5]	380	static int printStatsXML( FILE * stream ) { // see malloc_info
[b6830d74]	381	char helpText[512];
	382	int len = snprintf( helpText, sizeof(helpText),
[c4f68dc]	383	"<malloc version=\"1\">\n"
	384	"<heap nr=\"0\">\n"
	385	"<sizes>\n"
	386	"</sizes>\n"
	387	"<total type=\"malloc\" count=\"%u\" size=\"%llu\"/>\n"
	388	"<total type=\"calloc\" count=\"%u\" size=\"%llu\"/>\n"
	389	"<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n"
	390	"<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n"
	391	"<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n"
	392	"<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n"
	393	"<total type=\"mmap\" count=\"%u\" size=\"%llu\"/>\n"
	394	"<total type=\"munmap\" count=\"%u\" size=\"%llu\"/>\n"
	395	"<total type=\"sbrk\" count=\"%u\" size=\"%llu\"/>\n"
	396	"</malloc>",
	397	malloc_calls, malloc_storage,
	398	calloc_calls, calloc_storage,
	399	memalign_calls, memalign_storage,
	400	cmemalign_calls, cmemalign_storage,
	401	realloc_calls, realloc_storage,
	402	free_calls, free_storage,
	403	mmap_calls, mmap_storage,
	404	munmap_calls, munmap_storage,
	405	sbrk_calls, sbrk_storage
	406	);
[b6830d74]	407	return write( fileno( stream ), helpText, len ); // -1 => error
[d46ed6e]	408	} // printStatsXML
[c4f68dc]	409	#endif // __STATISTICS__
	410
[b6830d74]	411	// #comment TD : Is this the samething as Out-of-Memory?
[c4f68dc]	412	static inline void noMemory() {
[b6830d74]	413	abort( "Heap memory exhausted at %zu bytes.\n"
[bcb14b5]	414	"Possible cause is very large memory allocation and/or large amount of unfreed storage allocated by the program or system/library routines.",
	415	((char )(sbrk( 0 )) - (char )(heapManager.heapBegin)) );
[c4f68dc]	416	} // noMemory
	417
	418
	419	static inline void checkAlign( size_t alignment ) {
[b6830d74]	420	if ( alignment < sizeof(void *) \|\| ! libPow2( alignment ) ) {
[c4f68dc]	421	abort( "Alignment %zu for memory allocation is less than sizeof(void *) and/or not a power of 2.", alignment );
[b6830d74]	422	} // if
[c4f68dc]	423	} // checkAlign
	424
	425
[93c2e0a]	426	static inline bool setHeapExpand( size_t value ) {
[bcb14b5]	427	if ( heapExpand < pageSize ) return true;
[b6830d74]	428	heapExpand = value;
	429	return false;
[c4f68dc]	430	} // setHeapExpand
	431
	432
[93c2e0a]	433	static inline void checkHeader( bool check, const char * name, void * addr ) {
[b6830d74]	434	if ( unlikely( check ) ) { // bad address ?
[c4f68dc]	435	abort( "Attempt to %s storage %p with address outside the heap.\n"
[bcb14b5]	436	"Possible cause is duplicate free on same block or overwriting of memory.",
	437	name, addr );
[b6830d74]	438	} // if
[c4f68dc]	439	} // checkHeader
	440
[b6830d74]	441	// #comment TD : function should be commented and/or have a more evocative name
	442	// this isn't either a check or a constructor which is what I would expect this function to be
[c4f68dc]	443	static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & size, size_t & alignment ) {
[b6830d74]	444	if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ?
[c4f68dc]	445	size_t offset = header->kind.fake.offset;
	446	alignment = header->kind.fake.alignment & -2; // remove flag from value
	447	#ifdef __CFA_DEBUG__
	448	checkAlign( alignment ); // check alignment
	449	#endif // __CFA_DEBUG__
	450	header = (HeapManager.Storage.Header )((char )header - offset);
[b6830d74]	451	} // if
[c4f68dc]	452	} // fakeHeader
	453
[b6830d74]	454	// #comment TD : Why is this a define
[c4f68dc]	455	#define headerAddr( addr ) ((HeapManager.Storage.Header )( (char )addr - sizeof(HeapManager.Storage) ))
	456
[93c2e0a]	457	static inline bool headers( const char * name, void * addr, HeapManager.Storage.Header & header, HeapManager.FreeHeader & freeElem, size_t & size, size_t & alignment ) with ( heapManager ) {
[b6830d74]	458	header = headerAddr( addr );
[c4f68dc]	459
[b6830d74]	460	if ( unlikely( heapEnd < addr ) ) { // mmapped ?
[c4f68dc]	461	fakeHeader( header, size, alignment );
	462	size = header->kind.real.blockSize & -3; // mmap size
	463	return true;
[b6830d74]	464	} // if
[c4f68dc]	465
	466	#ifdef __CFA_DEBUG__
[bcb14b5]	467	checkHeader( addr < heapBegin \|\| header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ?
[c4f68dc]	468	#endif // __CFA_DEBUG__
[b6830d74]	469
	470	// #comment TD : This code looks weird...
	471	// It's called as the first statement of both branches of the last if, with the same parameters in all cases
	472
[bcb14b5]	473	// header may be safe to dereference
	474	fakeHeader( header, size, alignment );
[c4f68dc]	475	#ifdef __CFA_DEBUG__
[bcb14b5]	476	checkHeader( header < (HeapManager.Storage.Header )heapBegin \|\| (HeapManager.Storage.Header )heapEnd < header, name, addr ); // bad address ? (offset could be + or -)
[c4f68dc]	477	#endif // __CFA_DEBUG__
	478
[bcb14b5]	479	freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3);
[c4f68dc]	480	#ifdef __CFA_DEBUG__
[bcb14b5]	481	if ( freeElem < &freeLists[0] \|\| &freeLists[NoBucketSizes] <= freeElem ) {
	482	abort( "Attempt to %s storage %p with corrupted header.\n"
	483	"Possible cause is duplicate free on same block or overwriting of header information.",
	484	name, addr );
	485	} // if
[c4f68dc]	486	#endif // __CFA_DEBUG__
[bcb14b5]	487	size = freeElem->blockSize;
	488	return false;
[c4f68dc]	489	} // headers
	490
	491
	492	static inline void * extend( size_t size ) with ( heapManager ) {
[b6830d74]	493	lock( extlock __cfaabi_dbg_ctx2 );
	494	ptrdiff_t rem = heapRemaining - size;
	495	if ( rem < 0 ) {
[c4f68dc]	496	// If the size requested is bigger than the current remaining storage, increase the size of the heap.
	497
	498	size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() );
	499	if ( sbrk( increase ) == (void *)-1 ) {
	500	unlock( extlock );
	501	errno = ENOMEM;
	502	return 0;
	503	} // if
[bcb14b5]	504	#ifdef __STATISTICS__
[c4f68dc]	505	sbrk_calls += 1;
	506	sbrk_storage += increase;
[bcb14b5]	507	#endif // __STATISTICS__
	508	#ifdef __CFA_DEBUG__
[c4f68dc]	509	// Set new memory to garbage so subsequent uninitialized usages might fail.
	510	memset( (char *)heapEnd + heapRemaining, '\377', increase );
[bcb14b5]	511	#endif // __CFA_DEBUG__
[c4f68dc]	512	rem = heapRemaining + increase - size;
[b6830d74]	513	} // if
[c4f68dc]	514
[b6830d74]	515	HeapManager.Storage * block = (HeapManager.Storage *)heapEnd;
	516	heapRemaining = rem;
	517	heapEnd = (char *)heapEnd + size;
	518	unlock( extlock );
	519	return block;
[c4f68dc]	520	} // extend
	521
	522
[e723100]	523	size_t Bsearchl( unsigned int key, const unsigned int * vals, size_t dim ) {
	524	size_t l = 0, m, h = dim;
	525	while ( l < h ) {
	526	m = (l + h) / 2;
	527	if ( (unsigned int &)(vals[m]) < key ) { // cast away const
	528	l = m + 1;
	529	} else {
	530	h = m;
	531	} // if
	532	} // while
	533	return l;
	534	} // Bsearchl
	535
	536
[c4f68dc]	537	static inline void * doMalloc( size_t size ) with ( heapManager ) {
[7b149bc]	538	HeapManager.Storage * block; // pointer to new block of storage
[c4f68dc]	539
[b6830d74]	540	// Look up size in the size list. Make sure the user request includes space for the header that must be allocated
	541	// along with the block and is a multiple of the alignment size.
[c4f68dc]	542
[b6830d74]	543	size_t tsize = size + sizeof(HeapManager.Storage);
	544	if ( likely( tsize < mmapStart ) ) { // small size => sbrk
[e723100]	545	size_t posn;
	546	#ifdef FASTLOOKUP
	547	if ( tsize < LookupSizes ) posn = lookup[tsize];
	548	else
	549	#endif // FASTLOOKUP
	550	posn = Bsearchl( (unsigned int)tsize, bucketSizes, (size_t)maxBucketsUsed );
	551	HeapManager.FreeHeader * freeElem = &freeLists[posn];
	552	// #ifdef FASTLOOKUP
	553	// if ( tsize < LookupSizes )
	554	// freeElem = &freeLists[lookup[tsize]];
	555	// else
	556	// #endif // FASTLOOKUP
	557	// freeElem = bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
	558	// HeapManager.FreeHeader * freeElem =
	559	// #ifdef FASTLOOKUP
	560	// tsize < LookupSizes ? &freeLists[lookup[tsize]] :
	561	// #endif // FASTLOOKUP
	562	// bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search
[c4f68dc]	563	assert( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ?
	564	assert( tsize <= freeElem->blockSize ); // search failure ?
	565	tsize = freeElem->blockSize; // total space needed for request
	566
	567	// Spin until the lock is acquired for this particular size of block.
	568
	569	#if defined( SPINLOCK )
[bcb14b5]	570	lock( freeElem->lock __cfaabi_dbg_ctx2 );
	571	block = freeElem->freeList; // remove node from stack
[c4f68dc]	572	#else
[bcb14b5]	573	block = freeElem->freeList.pop();
[c4f68dc]	574	#endif // SPINLOCK
	575	if ( unlikely( block == 0 ) ) { // no free block ?
	576	#if defined( SPINLOCK )
	577	unlock( freeElem->lock );
	578	#endif // SPINLOCK
[bcb14b5]	579
[c4f68dc]	580	// Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more
	581	// and then carve it off.
	582
	583	block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call
[bcb14b5]	584	if ( unlikely( block == 0 ) ) return 0;
[c4f68dc]	585	#if defined( SPINLOCK )
	586	} else {
	587	freeElem->freeList = block->header.kind.real.next;
	588	unlock( freeElem->lock );
	589	#endif // SPINLOCK
	590	} // if
	591
	592	block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size
[bcb14b5]	593	} else { // large size => mmap
[c4f68dc]	594	tsize = libCeiling( tsize, pageSize ); // must be multiple of page size
	595	#ifdef __STATISTICS__
[bcb14b5]	596	__atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST );
	597	__atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST );
[c4f68dc]	598	#endif // __STATISTICS__
	599	block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| MAP_ANONYMOUS, mmapFd, 0 );
	600	if ( block == (HeapManager.Storage *)MAP_FAILED ) {
	601	// Do not call strerror( errno ) as it may call malloc.
	602	abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu error:%d.", &heapManager, tsize, errno );
	603	} // if
[bcb14b5]	604	#ifdef __CFA_DEBUG__
[c4f68dc]	605	// Set new memory to garbage so subsequent uninitialized usages might fail.
	606	memset( block, '\377', tsize );
[bcb14b5]	607	#endif // __CFA_DEBUG__
[c4f68dc]	608	block->header.kind.real.blockSize = tsize; // storage size for munmap
[bcb14b5]	609	} // if
[c4f68dc]	610
[bcb14b5]	611	void * area = &(block->data); // adjust off header to user bytes
[c4f68dc]	612
	613	#ifdef __CFA_DEBUG__
[bcb14b5]	614	assert( ((uintptr_t)area & (libAlign() - 1)) == 0 ); // minimum alignment ?
	615	__atomic_add_fetch( &allocFree, tsize, __ATOMIC_SEQ_CST );
	616	if ( traceHeap() ) {
	617	enum { BufferSize = 64 };
	618	char helpText[BufferSize];
	619	int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", area, size, tsize );
	620	// int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", area, size );
	621	__cfaabi_dbg_bits_write( helpText, len );
	622	} // if
[c4f68dc]	623	#endif // __CFA_DEBUG__
	624
[b6830d74]	625	return area;
[c4f68dc]	626	} // doMalloc
	627
	628
	629	static inline void doFree( void * addr ) with ( heapManager ) {
	630	#ifdef __CFA_DEBUG__
[bcb14b5]	631	if ( unlikely( heapManager.heapBegin == 0 ) ) {
	632	abort( "doFree( %p ) : internal error, called before heap is initialized.", addr );
	633	} // if
[c4f68dc]	634	#endif // __CFA_DEBUG__
	635
[b6830d74]	636	HeapManager.Storage.Header * header;
	637	HeapManager.FreeHeader * freeElem;
	638	size_t size, alignment; // not used (see realloc)
[c4f68dc]	639
[b6830d74]	640	if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ?
[c4f68dc]	641	#ifdef __STATISTICS__
[bcb14b5]	642	__atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST );
	643	__atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	644	#endif // __STATISTICS__
	645	if ( munmap( header, size ) == -1 ) {
	646	#ifdef __CFA_DEBUG__
	647	abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n"
[bcb14b5]	648	"Possible cause is invalid pointer.",
	649	addr );
[c4f68dc]	650	#endif // __CFA_DEBUG__
	651	} // if
[bcb14b5]	652	} else {
[c4f68dc]	653	#ifdef __CFA_DEBUG__
[bcb14b5]	654	// Set free memory to garbage so subsequent usages might fail.
	655	memset( ((HeapManager.Storage *)header)->data, '\377', freeElem->blockSize - sizeof( HeapManager.Storage ) );
[c4f68dc]	656	#endif // __CFA_DEBUG__
	657
	658	#ifdef __STATISTICS__
[bcb14b5]	659	free_storage += size;
[c4f68dc]	660	#endif // __STATISTICS__
	661	#if defined( SPINLOCK )
[bcb14b5]	662	lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock
	663	header->kind.real.next = freeElem->freeList; // push on stack
	664	freeElem->freeList = (HeapManager.Storage *)header;
	665	unlock( freeElem->lock ); // release spin lock
[c4f68dc]	666	#else
[bcb14b5]	667	freeElem->freeList.push( (HeapManager.Storage )header );
[c4f68dc]	668	#endif // SPINLOCK
[bcb14b5]	669	} // if
[c4f68dc]	670
	671	#ifdef __CFA_DEBUG__
[bcb14b5]	672	__atomic_add_fetch( &allocFree, -size, __ATOMIC_SEQ_CST );
	673	if ( traceHeap() ) {
[7b149bc]	674	enum { BufferSize = 64 };
	675	char helpText[BufferSize];
[bcb14b5]	676	int len = snprintf( helpText, sizeof(helpText), "Free( %p ) size:%zu\n", addr, size );
	677	__cfaabi_dbg_bits_write( helpText, len );
	678	} // if
[c4f68dc]	679	#endif // __CFA_DEBUG__
	680	} // doFree
	681
	682
[5d4fa18]	683	size_t checkFree( HeapManager & manager ) with ( manager ) {
[b6830d74]	684	size_t total = 0;
[c4f68dc]	685	#ifdef __STATISTICS__
[bcb14b5]	686	__cfaabi_dbg_bits_acquire();
	687	__cfaabi_dbg_bits_print_nolock( "\nBin lists (bin size : free blocks on list)\n" );
[c4f68dc]	688	#endif // __STATISTICS__
[b6830d74]	689	for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) {
[d46ed6e]	690	size_t size = freeLists[i].blockSize;
	691	#ifdef __STATISTICS__
	692	unsigned int N = 0;
	693	#endif // __STATISTICS__
[b6830d74]	694
[d46ed6e]	695	#if defined( SPINLOCK )
	696	for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0; p = p->header.kind.real.next ) {
	697	#else
	698	for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0; p = p->header.kind.real.next.top ) {
	699	#endif // SPINLOCK
	700	total += size;
	701	#ifdef __STATISTICS__
	702	N += 1;
	703	#endif // __STATISTICS__
[b6830d74]	704	} // for
	705
[d46ed6e]	706	#ifdef __STATISTICS__
[bcb14b5]	707	__cfaabi_dbg_bits_print_nolock( "%7zu, %-7u ", size, N );
	708	if ( (i + 1) % 8 == 0 ) __cfaabi_dbg_bits_print_nolock( "\n" );
[d46ed6e]	709	#endif // __STATISTICS__
	710	} // for
	711	#ifdef __STATISTICS__
[bcb14b5]	712	__cfaabi_dbg_bits_print_nolock( "\ntotal free blocks:%zu\n", total );
	713	__cfaabi_dbg_bits_release();
[d46ed6e]	714	#endif // __STATISTICS__
	715	return (char )heapEnd - (char )heapBegin - total;
	716	} // checkFree
[c4f68dc]	717
[bcb14b5]	718
	719	static inline void * mallocNoStats( size_t size ) { // necessary for malloc statistics
[7117ac3]	720	//assert( heapManager.heapBegin != 0 );
	721	if ( unlikely( heapManager.heapBegin == 0 ) ) heapManager{}; // called before memory_startup ?
[b6830d74]	722	void * area = doMalloc( size );
	723	if ( unlikely( area == 0 ) ) errno = ENOMEM; // POSIX
	724	return area;
[bcb14b5]	725	} // mallocNoStats
[c4f68dc]	726
	727
[bcb14b5]	728	static inline void * memalignNoStats( size_t alignment, size_t size ) { // necessary for malloc statistics
	729	#ifdef __CFA_DEBUG__
[b6830d74]	730	checkAlign( alignment ); // check alignment
[bcb14b5]	731	#endif // __CFA_DEBUG__
[c4f68dc]	732
[b6830d74]	733	// if alignment <= default alignment, do normal malloc as two headers are unnecessary
[bcb14b5]	734	if ( unlikely( alignment <= libAlign() ) ) return mallocNoStats( size );
[b6830d74]	735
	736	// Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for
	737	// administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC.
	738	// .-------------v-----------------v----------------v----------,
	739	// \| Real Header \| ... padding ... \| Fake Header \| data ... \|
	740	// `-------------^-----------------^-+--------------^----------'
	741	// \|<--------------------------------' offset/align \|<-- alignment boundary
	742
	743	// subtract libAlign() because it is already the minimum alignment
	744	// add sizeof(Storage) for fake header
[bcb14b5]	745	// #comment TD : this is the only place that calls doMalloc without calling mallocNoStats, why ?
[b6830d74]	746	char * area = (char *)doMalloc( size + alignment - libAlign() + sizeof(HeapManager.Storage) );
[bcb14b5]	747	if ( unlikely( area == 0 ) ) return area;
[b6830d74]	748
	749	// address in the block of the "next" alignment address
	750	char * user = (char *)libCeiling( (uintptr_t)(area + sizeof(HeapManager.Storage)), alignment );
	751
	752	// address of header from malloc
	753	HeapManager.Storage.Header * realHeader = headerAddr( area );
	754	// address of fake header * before* the alignment location
	755	HeapManager.Storage.Header * fakeHeader = headerAddr( user );
	756	// SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment
	757	fakeHeader->kind.fake.offset = (char )fakeHeader - (char )realHeader;
	758	// SKULLDUGGERY: odd alignment imples fake header
	759	fakeHeader->kind.fake.alignment = alignment \| 1;
	760
	761	return user;
[bcb14b5]	762	} // memalignNoStats
[c4f68dc]	763
	764
[e723100]	765	// supported mallopt options
	766	#ifndef M_MMAP_THRESHOLD
	767	#define M_MMAP_THRESHOLD (-1)
	768	#endif // M_TOP_PAD
	769	#ifndef M_TOP_PAD
	770	#define M_TOP_PAD (-2)
	771	#endif // M_TOP_PAD
	772
	773
[c4f68dc]	774	extern "C" {
[bcb14b5]	775	// The malloc() function allocates size bytes and returns a pointer to the allocated memory. The memory is not
	776	// initialized. If size is 0, then malloc() returns either NULL, or a unique pointer value that can later be
	777	// successfully passed to free().
[b6830d74]	778	void * malloc( size_t size ) {
[c4f68dc]	779	#ifdef __STATISTICS__
[bcb14b5]	780	__atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST );
	781	__atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	782	#endif // __STATISTICS__
	783
[bcb14b5]	784	return mallocNoStats( size );
	785	} // malloc
[c4f68dc]	786
[bcb14b5]	787	// The calloc() function allocates memory for an array of nmemb elements of size bytes each and returns a pointer to
	788	// the allocated memory. The memory is set to zero. If nmemb or size is 0, then calloc() returns either NULL, or a
	789	// unique pointer value that can later be successfully passed to free().
	790	void * calloc( size_t noOfElems, size_t elemSize ) {
[c4f68dc]	791	size_t size = noOfElems * elemSize;
	792	#ifdef __STATISTICS__
[bcb14b5]	793	__atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST );
	794	__atomic_add_fetch( &calloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	795	#endif // __STATISTICS__
	796
[bcb14b5]	797	char * area = (char *)mallocNoStats( size );
	798	if ( unlikely( area == 0 ) ) return 0;
[b6830d74]	799
[c4f68dc]	800	HeapManager.Storage.Header * header;
	801	HeapManager.FreeHeader * freeElem;
	802	size_t asize, alignment;
[93c2e0a]	803	bool mapped __attribute__(( unused )) = headers( "calloc", area, header, freeElem, asize, alignment );
[c4f68dc]	804	#ifndef __CFA_DEBUG__
[73abe95]	805	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
[c4f68dc]	806	if ( ! mapped )
	807	#endif // __CFA_DEBUG__
	808	memset( area, '\0', asize - sizeof(HeapManager.Storage) ); // set to zeros
[b6830d74]	809
[bcb14b5]	810	header->kind.real.blockSize \|= 2; // mark as zero filled
[c4f68dc]	811	return area;
[bcb14b5]	812	} // calloc
[c4f68dc]	813
[b6830d74]	814	// #comment TD : Document this function
	815	void * cmemalign( size_t alignment, size_t noOfElems, size_t elemSize ) {
[c4f68dc]	816	size_t size = noOfElems * elemSize;
	817	#ifdef __STATISTICS__
[bcb14b5]	818	__atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST );
	819	__atomic_add_fetch( &cmemalign_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	820	#endif // __STATISTICS__
	821
[bcb14b5]	822	char * area = (char *)memalignNoStats( alignment, size );
	823	if ( unlikely( area == 0 ) ) return 0;
[c4f68dc]	824	HeapManager.Storage.Header * header;
	825	HeapManager.FreeHeader * freeElem;
	826	size_t asize;
[93c2e0a]	827	bool mapped __attribute__(( unused )) = headers( "cmemalign", area, header, freeElem, asize, alignment );
[c4f68dc]	828	#ifndef __CFA_DEBUG__
[73abe95]	829	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
[c4f68dc]	830	if ( ! mapped )
[bcb14b5]	831	#endif // __CFA_DEBUG__
[c4f68dc]	832	memset( area, '\0', asize - ( (char )area - (char )header ) ); // set to zeros
	833	header->kind.real.blockSize \|= 2; // mark as zero filled
	834
	835	return area;
[bcb14b5]	836	} // cmemalign
	837
	838	// The realloc() function changes the size of the memory block pointed to by ptr to size bytes. The contents will be
	839	// unchanged in the range from the start of the region up to the minimum of the old and new sizes. If the new size
	840	// is larger than the old size, the added memory will not be initialized. If ptr is NULL, then the call is
	841	// equivalent to malloc(size), for all values of size; if size is equal to zero, and ptr is not NULL, then the call
	842	// is equivalent to free(ptr). Unless ptr is NULL, it must have been returned by an earlier call to malloc(),
	843	// calloc() or realloc(). If the area pointed to was moved, a free(ptr) is done.
	844	void * realloc( void * addr, size_t size ) {
[c4f68dc]	845	#ifdef __STATISTICS__
[bcb14b5]	846	__atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST );
[c4f68dc]	847	#endif // __STATISTICS__
	848
[bcb14b5]	849	if ( unlikely( addr == 0 ) ) return mallocNoStats( size ); // special cases
	850	if ( unlikely( size == 0 ) ) { free( addr ); return 0; }
[c4f68dc]	851
	852	HeapManager.Storage.Header * header;
	853	HeapManager.FreeHeader * freeElem;
	854	size_t asize, alignment = 0;
	855	headers( "realloc", addr, header, freeElem, asize, alignment );
	856
	857	size_t usize = asize - ( (char )addr - (char )header ); // compute the amount of user storage in the block
	858	if ( usize >= size ) { // already sufficient storage
	859	// This case does not result in a new profiler entry because the previous one still exists and it must match with
	860	// the free for this memory. Hence, this realloc does not appear in the profiler output.
	861	return addr;
	862	} // if
	863
	864	#ifdef __STATISTICS__
[bcb14b5]	865	__atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST );
[c4f68dc]	866	#endif // __STATISTICS__
	867
	868	void * area;
	869	if ( unlikely( alignment != 0 ) ) { // previous request memalign?
[b5ce31e]	870	area = memalign( alignment, size ); // create new aligned area
[c4f68dc]	871	} else {
[bcb14b5]	872	area = mallocNoStats( size ); // create new area
[c4f68dc]	873	} // if
[bcb14b5]	874	if ( unlikely( area == 0 ) ) return 0;
[c4f68dc]	875	if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill (calloc/cmemalign) ?
	876	assert( (header->kind.real.blockSize & 1) == 0 );
[93c2e0a]	877	bool mapped __attribute__(( unused )) = headers( "realloc", area, header, freeElem, asize, alignment );
[c4f68dc]	878	#ifndef __CFA_DEBUG__
[73abe95]	879	// Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero.
[c4f68dc]	880	if ( ! mapped )
[7b149bc]	881	#endif // __CFA_DEBUG__
[c4f68dc]	882	memset( (char )area + usize, '\0', asize - ( (char )area - (char *)header ) - usize ); // zero-fill back part
	883	header->kind.real.blockSize \|= 2; // mark new request as zero fill
	884	} // if
	885	memcpy( area, addr, usize ); // copy bytes
	886	free( addr );
	887	return area;
[b6830d74]	888	} // realloc
[c4f68dc]	889
	890
[bcb14b5]	891	// The obsolete function memalign() allocates size bytes and returns a pointer to the allocated memory. The memory
	892	// address will be a multiple of alignment, which must be a power of two.
	893	void * memalign( size_t alignment, size_t size ) {
[c4f68dc]	894	#ifdef __STATISTICS__
	895	__atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST );
	896	__atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST );
	897	#endif // __STATISTICS__
	898
[bcb14b5]	899	void * area = memalignNoStats( alignment, size );
[c4f68dc]	900
	901	return area;
[bcb14b5]	902	} // memalign
[c4f68dc]	903
[bcb14b5]	904	// The function aligned_alloc() is the same as memalign(), except for the added restriction that size should be a
	905	// multiple of alignment.
[b6830d74]	906	void * aligned_alloc( size_t alignment, size_t size ) {
[c4f68dc]	907	return memalign( alignment, size );
[b6830d74]	908	} // aligned_alloc
[c4f68dc]	909
	910
[bcb14b5]	911	// The function posix_memalign() allocates size bytes and places the address of the allocated memory in *memptr. The
	912	// address of the allocated memory will be a multiple of alignment, which must be a power of two and a multiple of
	913	// sizeof(void *). If size is 0, then posix_memalign() returns either NULL, or a unique pointer value that can later
	914	// be successfully passed to free(3).
[b6830d74]	915	int posix_memalign( void ** memptr, size_t alignment, size_t size ) {
[bcb14b5]	916	if ( alignment < sizeof(void *) \|\| ! libPow2( alignment ) ) return EINVAL; // check alignment
[c4f68dc]	917	* memptr = memalign( alignment, size );
[bcb14b5]	918	if ( unlikely( * memptr == 0 ) ) return ENOMEM;
[c4f68dc]	919	return 0;
[b6830d74]	920	} // posix_memalign
[c4f68dc]	921
[bcb14b5]	922	// The obsolete function valloc() allocates size bytes and returns a pointer to the allocated memory. The memory
	923	// address will be a multiple of the page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).
[b6830d74]	924	void * valloc( size_t size ) {
[c4f68dc]	925	return memalign( pageSize, size );
[b6830d74]	926	} // valloc
[c4f68dc]	927
	928
[bcb14b5]	929	// The free() function frees the memory space pointed to by ptr, which must have been returned by a previous call to
	930	// malloc(), calloc() or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behavior
	931	// occurs. If ptr is NULL, no operation is performed.
[b6830d74]	932	void free( void * addr ) {
[c4f68dc]	933	#ifdef __STATISTICS__
[bcb14b5]	934	__atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST );
[c4f68dc]	935	#endif // __STATISTICS__
	936
[b6830d74]	937	// #comment TD : To decrease nesting I would but the special case in the
	938	// else instead, plus it reads more naturally to have the
	939	// short / normal case instead
[c4f68dc]	940	if ( unlikely( addr == 0 ) ) { // special case
[d46ed6e]	941	#ifdef __CFA_DEBUG__
[bcb14b5]	942	if ( traceHeap() ) {
	943	#define nullmsg "Free( 0x0 ) size:0\n"
	944	// Do not debug print free( 0 ), as it can cause recursive entry from sprintf.
	945	__cfaabi_dbg_bits_write( nullmsg, sizeof(nullmsg) - 1 );
	946	} // if
[d46ed6e]	947	#endif // __CFA_DEBUG__
[c4f68dc]	948	return;
	949	} // exit
	950
	951	doFree( addr );
[b6830d74]	952	} // free
[93c2e0a]	953
[bcb14b5]	954	// The mallopt() function adjusts parameters that control the behavior of the memory-allocation functions (see
	955	// malloc(3)). The param argument specifies the parameter to be modified, and value specifies the new value for that
[b6830d74]	956	// parameter.
[bcb14b5]	957	int mallopt( int option, int value ) {
[c4f68dc]	958	choose( option ) {
[bcb14b5]	959	case M_TOP_PAD:
	960	if ( setHeapExpand( value ) ) fallthru default;
	961	case M_MMAP_THRESHOLD:
	962	if ( setMmapStart( value ) ) fallthru default;
	963	default:
	964	// #comment TD : 1 for unsopported feels wrong
	965	return 1; // success, or unsupported
[c4f68dc]	966	} // switch
	967	return 0; // error
[b6830d74]	968	} // mallopt
[c4f68dc]	969
[bcb14b5]	970	// The malloc_trim() function attempts to release free memory at the top of the heap (by calling sbrk(2) with a
	971	// suitable argument).
[c4f68dc]	972	int malloc_trim( size_t ) {
	973	return 0; // => impossible to release memory
	974	} // malloc_trim
	975
[bcb14b5]	976	// The malloc_usable_size() function returns the number of usable bytes in the block pointed to by ptr, a pointer to
	977	// a block of memory allocated by malloc(3) or a related function.
	978	size_t malloc_usable_size( void * addr ) {
	979	if ( unlikely( addr == 0 ) ) return 0; // null allocation has 0 size
[b6830d74]	980
[c4f68dc]	981	HeapManager.Storage.Header * header;
	982	HeapManager.FreeHeader * freeElem;
	983	size_t size, alignment;
	984
	985	headers( "malloc_usable_size", addr, header, freeElem, size, alignment );
	986	size_t usize = size - ( (char )addr - (char )header ); // compute the amount of user storage in the block
	987	return usize;
[b6830d74]	988	} // malloc_usable_size
[c4f68dc]	989
	990
[bcb14b5]	991	// The malloc_alignment() function returns the alignment of the allocation.
[b6830d74]	992	size_t malloc_alignment( void * addr ) {
[bcb14b5]	993	if ( unlikely( addr == 0 ) ) return libAlign(); // minimum alignment
[c4f68dc]	994	HeapManager.Storage.Header * header = (HeapManager.Storage.Header )( (char )addr - sizeof(HeapManager.Storage) );
	995	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	996	return header->kind.fake.alignment & -2; // remove flag from value
	997	} else {
	998	return libAlign (); // minimum alignment
	999	} // if
[bcb14b5]	1000	} // malloc_alignment
[c4f68dc]	1001
	1002
[bcb14b5]	1003	// The malloc_zero_fill() function returns true if the allocation is zero filled, i.e., initially allocated by calloc().
[b6830d74]	1004	bool malloc_zero_fill( void * addr ) {
[bcb14b5]	1005	if ( unlikely( addr == 0 ) ) return false; // null allocation is not zero fill
[b6830d74]	1006
[c4f68dc]	1007	HeapManager.Storage.Header * header = (HeapManager.Storage.Header )( (char )addr - sizeof(HeapManager.Storage) );
	1008	if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ?
	1009	header = (HeapManager.Storage.Header )((char )header - header->kind.fake.offset);
	1010	} // if
	1011	return (header->kind.real.blockSize & 2) != 0; // zero filled (calloc/cmemalign) ?
[bcb14b5]	1012	} // malloc_zero_fill
[c4f68dc]	1013
	1014
[bcb14b5]	1015	// The malloc_stats() function prints (on default standard error) statistics about memory allocated by malloc(3) and
	1016	// related functions.
[b6830d74]	1017	void malloc_stats( void ) {
[c4f68dc]	1018	#ifdef __STATISTICS__
[bcb14b5]	1019	printStats();
	1020	if ( checkFree() ) checkFree( heapManager );
[c4f68dc]	1021	#endif // __STATISTICS__
[bcb14b5]	1022	} // malloc_stats
[c4f68dc]	1023
[bcb14b5]	1024	// The malloc_stats_fd() function changes the file descripter where malloc_stats() writes the statistics.
	1025	int malloc_stats_fd( int fd ) {
[c4f68dc]	1026	#ifdef __STATISTICS__
[bcb14b5]	1027	int temp = statfd;
	1028	statfd = fd;
	1029	return temp;
[c4f68dc]	1030	#else
[bcb14b5]	1031	return -1;
[c4f68dc]	1032	#endif // __STATISTICS__
[bcb14b5]	1033	} // malloc_stats_fd
[c4f68dc]	1034
[bcb14b5]	1035	// The malloc_info() function exports an XML string that describes the current state of the memory-allocation
	1036	// implementation in the caller. The string is printed on the file stream stream. The exported string includes
	1037	// information about all arenas (see malloc(3)).
[c4f68dc]	1038	int malloc_info( int options, FILE * stream ) {
[d46ed6e]	1039	return printStatsXML( stream );
[c4f68dc]	1040	} // malloc_info
	1041
	1042
[bcb14b5]	1043	// The malloc_get_state() function records the current state of all malloc(3) internal bookkeeping variables (but
	1044	// not the actual contents of the heap or the state of malloc_hook(3) functions pointers). The state is recorded in
	1045	// a system-dependent opaque data structure dynamically allocated via malloc(3), and a pointer to that data
	1046	// structure is returned as the function result. (It is the caller's responsibility to free(3) this memory.)
[c4f68dc]	1047	void * malloc_get_state( void ) {
[bcb14b5]	1048	return 0; // unsupported
[c4f68dc]	1049	} // malloc_get_state
	1050
[bcb14b5]	1051
	1052	// The malloc_set_state() function restores the state of all malloc(3) internal bookkeeping variables to the values
	1053	// recorded in the opaque data structure pointed to by state.
[c4f68dc]	1054	int malloc_set_state( void * ptr ) {
[bcb14b5]	1055	return 0; // unsupported
[c4f68dc]	1056	} // malloc_set_state
	1057	} // extern "C"
	1058
	1059
	1060	// Local Variables: //
	1061	// tab-width: 4 //
[f8cd310]	1062	// compile-command: "cfa -nodebug -O2 heap.cfa" //
[c4f68dc]	1063	// End: //

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