malloc.c File Reference

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>

Include dependency graph for malloc.c:

Go to the source code of this file.

Defines
#define	NDEBUG
#define	ptrint   int
#define	BRKSIZE   4096
#define	PTRSIZE   ((int) sizeof(void *))
#define	Align(x, a)   (((x) + (a - 1)) & ~(a - 1))
#define	NextSlot(p)   (* (void **) ((p) - PTRSIZE))
#define	NextFree(p)   (* (void **) (p))
Functions
void *	_sbrk (int)
int	_brk (void *)
static int	grow (size_t len)
void *	malloc (size_t size)
void *	realloc (void *oldp, size_t size)
void	free (void *ptr)
Variables
static void *	_bottom
static void *	_top
static void *	_empty

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Define Documentation

#define Align (  x, a   )     (((x) + (a - 1)) & ~(a - 1))

Definition at line 28 of file malloc.c. Referenced by grow(), malloc(), and realloc().

#define BRKSIZE   4096

Definition at line 25 of file malloc.c. Referenced by grow().

#define NDEBUG

Definition at line 8 of file malloc.c.

#define NextFree (  p   )     (* (void **) (p))

Definition at line 30 of file malloc.c. Referenced by free(), and realloc().

#define NextSlot (  p   )     (* (void **) ((p) - PTRSIZE))

Definition at line 29 of file malloc.c. Referenced by free(), grow(), and realloc().

#define ptrint   int

Definition at line 17 of file malloc.c. Referenced by grow().

#define PTRSIZE   ((int) sizeof(void *))

Definition at line 27 of file malloc.c. Referenced by insert_arg(), malloc(), and realloc().

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Function Documentation

int _brk (  void *   )

Referenced by grow().

void* _sbrk (  int   )

void free (  void *  ptr  )

Definition at line 174 of file malloc.c. References _empty, assert, next, NextFree, and NextSlot.

static int grow (  size_t  len  )  [static]

Definition at line 50 of file malloc.c. References _brk(), _top, Align, assert, BRKSIZE, ENOMEM, errno, free, NextSlot, p, and ptrint.

void* malloc (  size_t  size  )

Definition at line 70 of file malloc.c. References Align, ENOMEM, errno, next, NULL, p, and PTRSIZE.

void* realloc (  void *  oldp, size_t  size )

Definition at line 122 of file malloc.c. References _empty, Align, free, int(), malloc(), n, next, NextFree, NextSlot, NULL, and PTRSIZE.

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Variable Documentation

void* _bottom [static]

Definition at line 48 of file malloc.c.

void * _empty [static]

Definition at line 48 of file malloc.c. Referenced by free(), and realloc().

void * _top [static]

Definition at line 48 of file malloc.c. Referenced by grow().

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