diff options
Diffstat (limited to 'libc/stdlib/malloc-930716')
| -rw-r--r-- | libc/stdlib/malloc-930716/Makefile | 4 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/calloc.c | 5 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/free.c | 156 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/malloc.c | 361 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/malloc.h | 63 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/memalign.c | 61 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/morecore.c | 28 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/realloc.c | 131 | ||||
| -rw-r--r-- | libc/stdlib/malloc-930716/valloc.c | 62 |
9 files changed, 342 insertions, 529 deletions
diff --git a/libc/stdlib/malloc-930716/Makefile b/libc/stdlib/malloc-930716/Makefile index 444581b9b..b9dfea9f2 100644 --- a/libc/stdlib/malloc-930716/Makefile +++ b/libc/stdlib/malloc-930716/Makefile @@ -24,11 +24,11 @@ TOPDIR=../../../ include $(TOPDIR)Rules.mak -CSRC=calloc.c free.c malloc.c memalign.c morecore.c realloc.c valloc.c +CSRC=calloc.c malloc.c COBJS=$(patsubst %.c,%.o, $(CSRC)) MSRC=../malloc/alloc.c -MOBJ=malloc_dbg.o free_dbg.o calloc_dbg.o +MOBJ=#malloc_dbg.o free_dbg.o calloc_dbg.o OBJS=$(COBJS) $(MOBJ) all: $(OBJS) $(LIBC) diff --git a/libc/stdlib/malloc-930716/calloc.c b/libc/stdlib/malloc-930716/calloc.c index 152fe09c6..55d22ac11 100644 --- a/libc/stdlib/malloc-930716/calloc.c +++ b/libc/stdlib/malloc-930716/calloc.c @@ -8,13 +8,12 @@ WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ +#include <stdlib.h> #include <string.h> -#include "malloc.h" /* Allocate space for the given number of elements of the given size, initializing the whole region to binary zeroes. */ -void * -calloc(size_t nelem, size_t size) +void * calloc(size_t nelem, size_t size) { void *result; diff --git a/libc/stdlib/malloc-930716/free.c b/libc/stdlib/malloc-930716/free.c deleted file mode 100644 index fbc98b714..000000000 --- a/libc/stdlib/malloc-930716/free.c +++ /dev/null @@ -1,156 +0,0 @@ -/* free.c - C standard library routine. - Copyright (c) 1989, 1993 Michael J. Haertel - You may redistribute this library under the terms of the - GNU Library General Public License (version 2 or any later - version) as published by the Free Software Foundation. - THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED - WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR - WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS - SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ - -#include <limits.h> -#include <stddef.h> -#include <stdlib.h> -#include "malloc.h" - -/* Return memory to the heap. */ -void -_free_internal (void *ptr) -{ - int block, blocks, i, type; - struct list *prev, *next; - - if (!ptr) - return; - - block = BLOCK(ptr); - - switch (type = _heapinfo[block].busy.type) { - case 0: - /* Find the free cluster previous to this one in the free list. - Start searching at the last block referenced; this may benefit - programs with locality of allocation. */ - i = _heapindex; - if (i > block) - while (i > block) - i = _heapinfo[i].free.prev; - else { - do - i = _heapinfo[i].free.next; - while (i > 0 && i < block); - i = _heapinfo[i].free.prev; - } - - /* Determine how to link this block into the free list. */ - if (block == i + _heapinfo[i].free.size) { - /* Coalesce this block with its predecessor. */ - _heapinfo[i].free.size += _heapinfo[block].busy.info.size; - block = i; - } else { - /* Really link this block back into the free list. */ - _heapinfo[block].free.size = _heapinfo[block].busy.info.size; - _heapinfo[block].free.next = _heapinfo[i].free.next; - _heapinfo[block].free.prev = i; - _heapinfo[i].free.next = block; - _heapinfo[_heapinfo[block].free.next].free.prev = block; - } - - /* Now that the block is linked in, see if we can coalesce it - with its successor (by deleting its successor from the list - and adding in its size). */ - if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) { - _heapinfo[block].free.size - += _heapinfo[_heapinfo[block].free.next].free.size; - _heapinfo[block].free.next - = _heapinfo[_heapinfo[block].free.next].free.next; - _heapinfo[_heapinfo[block].free.next].free.prev = block; - } - - /* Now see if we can return stuff to the system. */ - blocks = _heapinfo[block].free.size; - if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit - && (*__morecore)(0) == ADDRESS(block + blocks)) { - _heaplimit -= blocks; - (*__morecore)(-blocks * BLOCKSIZE); - _heapinfo[_heapinfo[block].free.prev].free.next - = _heapinfo[block].free.next; - _heapinfo[_heapinfo[block].free.next].free.prev - = _heapinfo[block].free.prev; - block = _heapinfo[block].free.prev; - } - - /* Set the next search to begin at this block. */ - _heapindex = block; - break; - - default: - /* Get the address of the first free fragment in this block. */ - prev = (struct list *) ((char *) ADDRESS(block) - + (_heapinfo[block].busy.info.frag.first - << type)); - - if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1 - && _fragblocks[type] > 1) { - /* If all fragments of this block are free, remove them - from the fragment list and free the whole block. */ - --_fragblocks[type]; - for (next = prev, i = 1; i < BLOCKSIZE >> type; ++i) - next = next->next; - prev->prev->next = next; - if (next) - next->prev = prev->prev; - _heapinfo[block].busy.type = 0; - _heapinfo[block].busy.info.size = 1; - free(ADDRESS(block)); - } else if (_heapinfo[block].busy.info.frag.nfree) { - /* If some fragments of this block are free, link this fragment - into the fragment list after the first free fragment of - this block. */ - next = ptr; - next->next = prev->next; - next->prev = prev; - prev->next = next; - if (next->next) - next->next->prev = next; - ++_heapinfo[block].busy.info.frag.nfree; - } else { - /* No fragments of this block are free, so link this fragment - into the fragment list and announce that it is the first - free fragment of this block. */ - prev = (struct list *) ptr; - _heapinfo[block].busy.info.frag.nfree = 1; - _heapinfo[block].busy.info.frag.first - = (unsigned int) ((char *) ptr - (char *) NULL) % BLOCKSIZE - >> type; - prev->next = _fraghead[type].next; - prev->prev = &_fraghead[type]; - prev->prev->next = prev; - if (prev->next) - prev->next->prev = prev; - } - break; - } -} - -struct alignlist *_aligned_blocks = NULL; - -void -free (void *ptr) -{ - register struct alignlist *l; - - if (ptr == NULL) - return; - - for (l = _aligned_blocks; l != NULL; l = l->next) - { - if (l->aligned == ptr) - { - l->aligned = NULL; /* Mark the slot in the list as free. */ - ptr = l->exact; - break; - } - } - - _free_internal (ptr); -} diff --git a/libc/stdlib/malloc-930716/malloc.c b/libc/stdlib/malloc-930716/malloc.c index 88c9251ad..f4c147f0c 100644 --- a/libc/stdlib/malloc-930716/malloc.c +++ b/libc/stdlib/malloc-930716/malloc.c @@ -8,42 +8,69 @@ WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ +#define _GNU_SOURCE +#include <features.h> #include <limits.h> #include <stddef.h> #include <stdlib.h> #include <string.h> +#include <unistd.h> #include "malloc.h" +#define MIN(x,y) ({ \ + const typeof(x) _x = (x); \ + const typeof(y) _y = (y); \ + (void) (&_x == &_y); \ + _x < _y ? _x : _y; }) + + +#ifdef __UCLIBC_HAS_THREADS__ +#include <pthread.h> +static pthread_mutex_t malloclock = PTHREAD_MUTEX_INITIALIZER; +# define LOCK pthread_mutex_lock(&malloclock) +# define UNLOCK pthread_mutex_unlock(&malloclock); +#else +# define LOCK +# define UNLOCK +#endif + +static void * malloc_unlocked (size_t size); +static void free_unlocked(void *ptr); +static void * __default_morecore_init(long size); + /* How to really get more memory. */ -void *(*__morecore)(long) = __default_morecore_init; +static void *(*__morecore)(long) = __default_morecore_init; /* Pointer to the base of the first block. */ -char *_heapbase; +static char *_heapbase; /* Block information table. */ -union info *_heapinfo; +static union info *_heapinfo; /* Number of info entries. */ -static int heapsize; +static size_t heapsize; /* Search index in the info table. */ -int _heapindex; +static size_t _heapindex; /* Limit of valid info table indices. */ -int _heaplimit; +static size_t _heaplimit; /* Count of large blocks allocated for each fragment size. */ -int _fragblocks[BLOCKLOG]; +static size_t _fragblocks[BLOCKLOG]; /* Free lists for each fragment size. */ -struct list _fraghead[BLOCKLOG]; +static struct list _fraghead[BLOCKLOG]; /* Are we experienced? */ static int initialized; -/* Aligned allocation. */ -static void * -align(size_t size) + + +/* Aligned allocation. + * Called within the lock in initialize() and morecore(), + * so no explicit locking needed... */ +static void * align(size_t size) { void *result; unsigned int adj; @@ -57,14 +84,16 @@ align(size_t size) return result; } -/* Set everything up and remember that we have. */ -static int -initialize(void) +/* Set everything up and remember that we have. + * Called within the lock in malloc(), so no + * explicit locking needed... */ +static int initialize(void) { heapsize = HEAP / BLOCKSIZE; _heapinfo = align(heapsize * sizeof (union info)); - if (!_heapinfo) + if (!_heapinfo) { return 0; + } memset(_heapinfo, 0, heapsize * sizeof (union info)); _heapinfo[0].free.size = 0; _heapinfo[0].free.next = _heapinfo[0].free.prev = 0; @@ -74,14 +103,15 @@ initialize(void) return 1; } -/* Get neatly aligned memory, initializing or growing the - heap info table as necessary. */ -static void * -morecore(size_t size) +/* Get neatly aligned memory, initializing or growing the + * heap info table as necessary. + * Called within a lock in malloc() and free(), + * so no explicit locking needed... */ +static void * morecore(size_t size) { void *result; union info *newinfo, *oldinfo; - int newsize; + size_t newsize; result = align(size); if (!result) @@ -104,11 +134,7 @@ morecore(size_t size) newinfo[BLOCK(oldinfo)].busy.info.size = BLOCKIFY(heapsize * sizeof (union info)); _heapinfo = newinfo; -#if 0 - free(oldinfo); -#else - _free_internal (oldinfo); -#endif + free_unlocked(oldinfo); heapsize = newsize; } @@ -116,16 +142,42 @@ morecore(size_t size) return result; } +/* Note that morecore has to take a signed argument so + that negative values can return memory to the system. */ +static void * __default_morecore_init(long size) +{ + void *result; + + result = sbrk(size); + if (result == (void *) -1) + return NULL; + return result; +} + /* Allocate memory from the heap. */ -void * -malloc (size_t size) +void * malloc (size_t size) +{ + void * ptr; + LOCK; + ptr = malloc_unlocked(size); + UNLOCK; + return(ptr); +} + +static void * malloc_unlocked (size_t size) { void *result; - int log, block, blocks, i, lastblocks, start; + size_t log, block, blocks, i, lastblocks, start; struct list *next; - if (!initialized && !initialize()) +#if 1 + /* Some programs will call malloc (0). Lets be strict and return NULL */ + if (size == 0) return NULL; +#endif + + if (size < sizeof (struct list)) + size = sizeof (struct list); #if 1 /* Some programs will call malloc (0). Lets be strict and return NULL */ @@ -136,6 +188,10 @@ malloc (size_t size) if (size < sizeof (struct list)) size = sizeof (struct list); + if (!initialized && !initialize()) { + return NULL; + } + /* Determine the allocation policy based on the request size. */ if (size <= BLOCKSIZE / 2) { /* Small allocation to receive a fragment of a block. Determine @@ -162,9 +218,10 @@ malloc (size_t size) } else { /* No free fragments of the desired size, so get a new block and break it into fragments, returning the first. */ - result = malloc(BLOCKSIZE); - if (!result) + result = malloc_unlocked(BLOCKSIZE); + if (!result) { return NULL; + } ++_fragblocks[log]; /* Link all fragments but the first into the free list. */ @@ -213,8 +270,9 @@ malloc (size_t size) continue; } result = morecore(blocks * BLOCKSIZE); - if (!result) + if (!result) { return NULL; + } block = BLOCK(result); _heapinfo[block].busy.type = 0; _heapinfo[block].busy.info.size = blocks; @@ -252,3 +310,242 @@ malloc (size_t size) return result; } + + + +/* Return memory to the heap. */ +void free(void *ptr) +{ + LOCK; + free_unlocked(ptr); + UNLOCK; +} + +static void free_unlocked(void *ptr) +{ + int block, blocks, i, type; + struct list *prev, *next; + + if (ptr == NULL) + return; + + block = BLOCK(ptr); + + switch (type = _heapinfo[block].busy.type) { + case 0: + /* Find the free cluster previous to this one in the free list. + Start searching at the last block referenced; this may benefit + programs with locality of allocation. */ + i = _heapindex; + if (i > block) + while (i > block) + i = _heapinfo[i].free.prev; + else { + do + i = _heapinfo[i].free.next; + while (i > 0 && i < block); + i = _heapinfo[i].free.prev; + } + + /* Determine how to link this block into the free list. */ + if (block == i + _heapinfo[i].free.size) { + /* Coalesce this block with its predecessor. */ + _heapinfo[i].free.size += _heapinfo[block].busy.info.size; + block = i; + } else { + /* Really link this block back into the free list. */ + _heapinfo[block].free.size = _heapinfo[block].busy.info.size; + _heapinfo[block].free.next = _heapinfo[i].free.next; + _heapinfo[block].free.prev = i; + _heapinfo[i].free.next = block; + _heapinfo[_heapinfo[block].free.next].free.prev = block; + } + + /* Now that the block is linked in, see if we can coalesce it + with its successor (by deleting its successor from the list + and adding in its size). */ + if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) { + _heapinfo[block].free.size + += _heapinfo[_heapinfo[block].free.next].free.size; + _heapinfo[block].free.next + = _heapinfo[_heapinfo[block].free.next].free.next; + _heapinfo[_heapinfo[block].free.next].free.prev = block; + } + + /* Now see if we can return stuff to the system. */ + blocks = _heapinfo[block].free.size; + if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit + && (*__morecore)(0) == ADDRESS(block + blocks)) { + _heaplimit -= blocks; + (*__morecore)(-blocks * BLOCKSIZE); + _heapinfo[_heapinfo[block].free.prev].free.next + = _heapinfo[block].free.next; + _heapinfo[_heapinfo[block].free.next].free.prev + = _heapinfo[block].free.prev; + block = _heapinfo[block].free.prev; + } + + /* Set the next search to begin at this block. */ + _heapindex = block; + break; + + default: + /* Get the address of the first free fragment in this block. */ + prev = (struct list *) ((char *) ADDRESS(block) + + (_heapinfo[block].busy.info.frag.first + << type)); + + if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1 + && _fragblocks[type] > 1) { + /* If all fragments of this block are free, remove them + from the fragment list and free the whole block. */ + --_fragblocks[type]; + for (next = prev, i = 1; i < BLOCKSIZE >> type; ++i) + next = next->next; + prev->prev->next = next; + if (next) + next->prev = prev->prev; + _heapinfo[block].busy.type = 0; + _heapinfo[block].busy.info.size = 1; + free_unlocked(ADDRESS(block)); + } else if (_heapinfo[block].busy.info.frag.nfree) { + /* If some fragments of this block are free, link this fragment + into the fragment list after the first free fragment of + this block. */ + next = ptr; + next->next = prev->next; + next->prev = prev; + prev->next = next; + if (next->next) + next->next->prev = next; + ++_heapinfo[block].busy.info.frag.nfree; + } else { + /* No fragments of this block are free, so link this fragment + into the fragment list and announce that it is the first + free fragment of this block. */ + prev = (struct list *) ptr; + _heapinfo[block].busy.info.frag.nfree = 1; + _heapinfo[block].busy.info.frag.first + = (unsigned int) ((char *) ptr - (char *) NULL) % BLOCKSIZE + >> type; + prev->next = _fraghead[type].next; + prev->prev = &_fraghead[type]; + prev->prev->next = prev; + if (prev->next) + prev->next->prev = prev; + } + break; + } +} + +/* Resize the given region to the new size, returning a pointer + to the (possibly moved) region. This is optimized for speed; + some benchmarks seem to indicate that greater compactness is + achieved by unconditionally allocating and copying to a + new region. */ +void * realloc (void *ptr, size_t size) +{ + void *result, *previous; + size_t block, blocks, type; + size_t oldlimit; + + if (!ptr) + return malloc(size); + if (!size) { + LOCK; + free_unlocked(ptr); + result = malloc_unlocked(0); + UNLOCK; + return(result); + } + + LOCK; + block = BLOCK(ptr); + + switch (type = _heapinfo[block].busy.type) { + case 0: + /* Maybe reallocate a large block to a small fragment. */ + if (size <= BLOCKSIZE / 2) { + if ((result = malloc_unlocked(size)) != NULL) { + memcpy(result, ptr, size); + free(ptr); + } + UNLOCK; + return result; + } + + /* The new size is a large allocation as well; see if + we can hold it in place. */ + blocks = BLOCKIFY(size); + if (blocks < _heapinfo[block].busy.info.size) { + /* The new size is smaller; return excess memory + to the free list. */ + _heapinfo[block + blocks].busy.type = 0; + _heapinfo[block + blocks].busy.info.size + = _heapinfo[block].busy.info.size - blocks; + _heapinfo[block].busy.info.size = blocks; + free(ADDRESS(block + blocks)); + UNLOCK; + return ptr; + } else if (blocks == _heapinfo[block].busy.info.size) { + /* No size change necessary. */ + UNLOCK; + return ptr; + } else { + /* Won't fit, so allocate a new region that will. Free + the old region first in case there is sufficient adjacent + free space to grow without moving. */ + blocks = _heapinfo[block].busy.info.size; + /* Prevent free from actually returning memory to the system. */ + oldlimit = _heaplimit; + _heaplimit = 0; + free(ptr); + _heaplimit = oldlimit; + result = malloc_unlocked(size); + if (!result) { + /* Now we're really in trouble. We have to unfree + the thing we just freed. Unfortunately it might + have been coalesced with its neighbors. */ + if (_heapindex == block) + malloc_unlocked(blocks * BLOCKSIZE); + else { + previous = malloc_unlocked((block - _heapindex) * BLOCKSIZE); + malloc_unlocked(blocks * BLOCKSIZE); + free(previous); + } + UNLOCK; + return NULL; + } + if (ptr != result) + memmove(result, ptr, blocks * BLOCKSIZE); + UNLOCK; + return result; + } + break; + + default: + /* Old size is a fragment; type is logarithm to base two of + the fragment size. */ + if ((size > 1 << (type - 1)) && (size <= 1 << type)) { + /* New size is the same kind of fragment. */ + UNLOCK; + return ptr; + } + else { + /* New size is different; allocate a new space, and copy + the lesser of the new size and the old. */ + result = malloc_unlocked(size); + if (!result) { + UNLOCK; + return NULL; + } + memcpy(result, ptr, MIN(size, (size_t)(1 << type))); + free(ptr); + UNLOCK; + return result; + } + break; + } + UNLOCK; +} + diff --git a/libc/stdlib/malloc-930716/malloc.h b/libc/stdlib/malloc-930716/malloc.h index 34458c062..fc21a13cc 100644 --- a/libc/stdlib/malloc-930716/malloc.h +++ b/libc/stdlib/malloc-930716/malloc.h @@ -10,23 +10,13 @@ #include <sys/cdefs.h> -/* Underlying allocation function; successive calls should return - contiguous pieces of memory. */ -extern void *(*__morecore)(long); - -/* Default value of previous. */ -extern void *__default_morecore_init(long); -extern void *__default_morecore(long); - /* The allocator divides the heap into blocks of fixed size; large requests receive one or more whole blocks, and small requests receive a fragment of a block. Fragment sizes are powers of two, and all fragments of a block are the same size. When all the fragments in a block have been freed, the block itself is freed. - WARNING: BLOCKSIZE must be set greater than or equal to the - machine's page size for valloc() to work correctly. The default - definition here is 4096 bytes. */ -#define INT_BIT (CHAR_BIT * sizeof (int)) + */ +#define INT_BIT (CHAR_BIT * sizeof (size_t)) #define BLOCKLOG (INT_BIT > 16 ? 12 : 9) #define BLOCKSIZE (1 << BLOCKLOG) #define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE) @@ -42,66 +32,31 @@ extern void *__default_morecore(long); /* Data structure giving per-block information. */ union info { struct { - int type; /* Zero for a large block, or positive + size_t type; /* Zero for a large block, or positive giving the logarithm to the base two of the fragment size. */ union { struct { - int nfree; /* Free fragments in a fragmented block. */ - int first; /* First free fragment of the block. */ + size_t nfree; /* Free fragments in a fragmented block. */ + size_t first; /* First free fragment of the block. */ } frag; - int size; /* Size (in blocks) of a large cluster. */ + size_t size; /* Size (in blocks) of a large cluster. */ } info; } busy; struct { - int size; /* Size (in blocks) of a free cluster. */ - int next; /* Index of next free cluster. */ - int prev; /* Index of previous free cluster. */ + size_t size; /* Size (in blocks) of a free cluster. */ + size_t next; /* Index of next free cluster. */ + size_t prev; /* Index of previous free cluster. */ } free; }; -/* Pointer to first block of the heap. */ -extern char *_heapbase; - -/* Table indexed by block number giving per-block information. */ -extern union info *_heapinfo; - /* Address to block number and vice versa. */ #define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1) #define ADDRESS(B) ((void *) (((B) - 1) * BLOCKSIZE + _heapbase)) -/* Current search index for the heap table. */ -extern int _heapindex; - -/* Limit of valid info table indices. */ -extern int _heaplimit; - /* Doubly linked lists of free fragments. */ struct list { struct list *next; struct list *prev; }; -/* Count of blocks for each fragment size. */ -extern int _fragblocks[]; - -/* Free list headers for each fragment size. */ -extern struct list _fraghead[]; - -/* List of blocks allocated with `memalign' (or `valloc'). */ -struct alignlist -{ - struct alignlist *next; - __ptr_t aligned; /* The address that memaligned returned. */ - __ptr_t exact; /* The address that malloc returned. */ -}; -extern struct alignlist *_aligned_blocks; - -extern void _free_internal __P ((__ptr_t __ptr)); - -extern void free (void *); -extern void * malloc (size_t); -extern void * calloc (size_t, size_t); -extern void * valloc (size_t); -extern void * memalign (size_t, size_t); -extern void * realloc (void *, size_t); diff --git a/libc/stdlib/malloc-930716/memalign.c b/libc/stdlib/malloc-930716/memalign.c deleted file mode 100644 index 1098f5890..000000000 --- a/libc/stdlib/malloc-930716/memalign.c +++ /dev/null @@ -1,61 +0,0 @@ -/* Copyright (C) 1991, 1992 Free Software Foundation, Inc. - -This library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. - -This library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with this library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ - -#include <stdlib.h> -#include "malloc.h" - -__ptr_t -memalign (alignment, size) - size_t alignment; - size_t size; -{ - __ptr_t result; - unsigned long int adj; - - result = malloc (size + alignment - 1); - if (result == NULL) - return NULL; - adj = (unsigned long int) ((unsigned long int) ((char *) result - - (char *) NULL)) % alignment; - if (adj != 0) - { - struct alignlist *l; - for (l = _aligned_blocks; l != NULL; l = l->next) - if (l->aligned == NULL) - /* This slot is free. Use it. */ - break; - if (l == NULL) - { - l = (struct alignlist *) malloc (sizeof (struct alignlist)); - if (l == NULL) - { -#if 1 - free (result); -#else - _free_internal (result); -#endif - return NULL; - } - l->next = _aligned_blocks; - _aligned_blocks = l; - } - l->exact = result; - result = l->aligned = (char *) result + alignment - adj; - } - - return result; -} diff --git a/libc/stdlib/malloc-930716/morecore.c b/libc/stdlib/malloc-930716/morecore.c deleted file mode 100644 index e2ad4464b..000000000 --- a/libc/stdlib/malloc-930716/morecore.c +++ /dev/null @@ -1,28 +0,0 @@ -/* morecore.c - C library support routine for UNIX. - Copyright (c) 1989, 1993 Michael J. Haertel - You may redistribute this library under the terms of the - GNU Library General Public License (version 2 or any later - version) as published by the Free Software Foundation. - THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED - WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR - WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS - SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ - -#include <limits.h> -#include <stddef.h> -#include "malloc.h" - -extern void *sbrk(int); - -/* Note that morecore has to take a signed argument so - that negative values can return memory to the system. */ -void * -__default_morecore_init(long size) -{ - void *result; - - result = sbrk(size); - if (result == (void *) -1) - return NULL; - return result; -} diff --git a/libc/stdlib/malloc-930716/realloc.c b/libc/stdlib/malloc-930716/realloc.c deleted file mode 100644 index 1453e813c..000000000 --- a/libc/stdlib/malloc-930716/realloc.c +++ /dev/null @@ -1,131 +0,0 @@ -/* realloc.c - C standard library routine. - Copyright (c) 1989, 1993 Michael J. Haertel - You may redistribute this library under the terms of the - GNU Library General Public License (version 2 or any later - version) as published by the Free Software Foundation. - THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED - WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR - WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS - SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ - -#include <limits.h> -#include <stddef.h> -#include <stdlib.h> -#include <string.h> -#include "malloc.h" - -#define MIN(A, B) ((A) < (B) ? (A) : (B)) - -/* Resize the given region to the new size, returning a pointer - to the (possibly moved) region. This is optimized for speed; - some benchmarks seem to indicate that greater compactness is - achieved by unconditionally allocating and copying to a - new region. */ -void * -realloc (void *ptr, size_t size) -{ - void *result, *previous; - int block, blocks, type; - int oldlimit; - - if (!ptr) - return malloc(size); - if (!size) { - free(ptr); - return malloc(0); - } - - block = BLOCK(ptr); - - switch (type = _heapinfo[block].busy.type) { - case 0: - /* Maybe reallocate a large block to a small fragment. */ - if (size <= BLOCKSIZE / 2) { - if ((result = malloc(size)) != NULL) { - memcpy(result, ptr, size); -#if 1 - free(ptr); -#else - _free_internal(ptr); -#endif - - } - return result; - } - - /* The new size is a large allocation as well; see if - we can hold it in place. */ - blocks = BLOCKIFY(size); - if (blocks < _heapinfo[block].busy.info.size) { - /* The new size is smaller; return excess memory - to the free list. */ - _heapinfo[block + blocks].busy.type = 0; - _heapinfo[block + blocks].busy.info.size - = _heapinfo[block].busy.info.size - blocks; - _heapinfo[block].busy.info.size = blocks; -#if 1 - free(ADDRESS(block + blocks)); -#else - _free_internal(ADDRESS(block + blocks)); -#endif - return ptr; - } else if (blocks == _heapinfo[block].busy.info.size) - /* No size change necessary. */ - return ptr; - else { - /* Won't fit, so allocate a new region that will. Free - the old region first in case there is sufficient adjacent - free space to grow without moving. */ - blocks = _heapinfo[block].busy.info.size; - /* Prevent free from actually returning memory to the system. */ - oldlimit = _heaplimit; - _heaplimit = 0; -#if 1 - free(ptr); -#else - _free_internal(ptr); -#endif - _heaplimit = oldlimit; - result = malloc(size); - if (!result) { - /* Now we're really in trouble. We have to unfree - the thing we just freed. Unfortunately it might - have been coalesced with its neighbors. */ - if (_heapindex == block) - malloc(blocks * BLOCKSIZE); - else { - previous = malloc((block - _heapindex) * BLOCKSIZE); - malloc(blocks * BLOCKSIZE); -#if 1 - free(previous); -#else - _free_internal(previous); -#endif - } - return NULL; - } - if (ptr != result) - memmove(result, ptr, blocks * BLOCKSIZE); - return result; - } - break; - - default: - /* Old size is a fragment; type is logarithm to base two of - the fragment size. */ - if ((size > 1 << (type - 1)) && (size <= 1 << type)) - /* New size is the same kind of fragment. */ - return ptr; - else { - /* New size is different; allocate a new space, and copy - the lesser of the new size and the old. */ - result = malloc(size); - if (!result) - return NULL; - memcpy(result, ptr, MIN(size, 1 << type)); - free(ptr); - return result; - } - break; - } -} diff --git a/libc/stdlib/malloc-930716/valloc.c b/libc/stdlib/malloc-930716/valloc.c deleted file mode 100644 index dad12a1d2..000000000 --- a/libc/stdlib/malloc-930716/valloc.c +++ /dev/null @@ -1,62 +0,0 @@ -/* Allocate memory on a page boundary. - Copyright (C) 1991, 1992 Free Software Foundation, Inc. - -This library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. - -This library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with this library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. - - The author may be reached (Email) at the address mike@ai.mit.edu, - or (US mail) as Mike Haertel c/o Free Software Foundation. */ - -#include <stdlib.h> -#include "malloc.h" - -#ifdef emacs -#include "config.h" -#endif - -#ifdef __GNU_LIBRARY__ -extern size_t __getpagesize __P ((void)); -#else -#ifndef USG -extern size_t getpagesize __P ((void)); -#define __getpagesize() getpagesize() -#else -#include <sys/param.h> -#ifdef EXEC_PAGESIZE -#define __getpagesize() EXEC_PAGESIZE -#else /* No EXEC_PAGESIZE. */ -#ifdef NBPG -#ifndef CLSIZE -#define CLSIZE 1 -#endif /* No CLSIZE. */ -#define __getpagesize() (NBPG * CLSIZE) -#else /* No NBPG. */ -#define __getpagesize() NBPC -#endif /* NBPG. */ -#endif /* EXEC_PAGESIZE. */ -#endif /* USG. */ -#endif - -static size_t pagesize; - -__ptr_t -valloc (size) - size_t size; -{ - if (pagesize == 0) - pagesize = __getpagesize (); - - return memalign (pagesize, size); -} |