array.c File Reference

Implementation of dynamic 2D arrays and memory management functions. More...

#include "mdb.h"

Go to the source code of this file.

Functions
void	keep_alloc_record (char *filename)
	Keeps a record of memory allocations by opening tracking files.
void *	tmalloc (uint64_t size_of_block)
	Allocates a memory block of the specified size with zero initialization.
void **	zarray_2d (uint64_t size, uint64_t n1, uint64_t n2)
	Allocates a 2D array with specified dimensions.
void **	resize_zarray_2d (uint64_t size, uint64_t old_n1, uint64_t old_n2, void **array, uint64_t n1, uint64_t n2)
	Resizes an existing 2D array to new dimensions.
int	free_zarray_2d (void **array, uint64_t n1, uint64_t n2)
	Frees a 2D array and its associated memory.
void *	trealloc (void *old_ptr, uint64_t size_of_block)
	Reallocates a memory block to a new size.
void	zero_memory (void *mem, uint64_t n_bytes)
	Sets a block of memory to zero.
int	tfree (void *ptr)
	Frees a memory block and records the deallocation if tracking is enabled.
void *	array_1d (uint64_t size, uint64_t lower_index, uint64_t upper_index)
	Allocates a 1D array with specified lower and upper indices.
void **	array_2d (uint64_t size, uint64_t lower1, uint64_t upper1, uint64_t lower2, uint64_t upper2)
	Allocates a 2D array with specified lower and upper indices for both dimensions.
int	free_array_1d (void *array, uint64_t size, uint64_t lower_index, uint64_t upper_index)
	Frees a 1D array that was previously allocated.
int	free_array_2d (void **array, uint64_t size, uint64_t lower1, uint64_t upper1, uint64_t lower2, uint64_t upper2)
	Frees a 2D array and its associated memory.
void **	czarray_2d (const uint64_t size, const uint64_t n1, const uint64_t n2)
	Allocates a contiguous 2D array with zero-based indexing.
void **	resize_czarray_2d (void **data, uint64_t size, uint64_t n1, uint64_t n2)
	Resizes a contiguous 2D array to new dimensions.
int	free_czarray_2d (void **array, uint64_t n1, uint64_t n2)
	Frees a contiguous 2D array and its associated memory.

Variables
static FILE *	fp_tmalloc = NULL
static FILE *	fp_trealloc = NULL
static FILE *	fp_tfree = NULL

Detailed Description

Implementation of dynamic 2D arrays and memory management functions.

This file contains functions for allocating, resizing, and freeing 2D arrays, as well as custom memory allocation functions with tracking capabilities.

Copyright

• (c) 2002 The University of Chicago, as Operator of Argonne National Laboratory.
• (c) 2002 The Regents of the University of California, as Operator of Los Alamos National Laboratory.

License

This file is distributed under the terms of the Software License Agreement found in the file LICENSE included with this distribution.

Author

M. Borland, C. Saunders, R. Soliday, H. Shang

Definition in file array.c.

Function Documentation

array_1d()

void * array_1d	(	uint64_t	size,
		uint64_t	lower_index,
		uint64_t	upper_index )

Allocates a 1D array with specified lower and upper indices.

Allocates memory for a 1D array and adjusts the pointer based on the lower index to allow negative indexing if necessary.

Parameters

size	The size of each element in the array.
lower_index	The lower index of the array.
upper_index	The upper index of the array.

Returns

Pointer to the allocated 1D array.

Definition at line 253 of file array.c.

                                                                          {
  char *ptr;
 
  if (!(ptr = tmalloc((uint64_t)size * (upper_index - lower_index + 1))))
    bomb("unable to allocate array (array_1d)", NULL);
  ptr -= lower_index * size;
  return ((void *)ptr);
}

array_2d()

void ** array_2d	(	uint64_t	size,
		uint64_t	lower1,
		uint64_t	upper1,
		uint64_t	lower2,
		uint64_t	upper2 )

Allocates a 2D array with specified lower and upper indices for both dimensions.

Allocates memory for a 2D array of pointers, where each row is a 1D array. Adjusts pointers based on lower indices to allow for flexible indexing ranges.

Parameters

size	The size of each element in the array.
lower1	The lower index for the first dimension (rows).
upper1	The upper index for the first dimension (rows).
lower2	The lower index for the second dimension (columns).
upper2	The upper index for the second dimension (columns).

Returns

Pointer to the allocated 2D array.

Definition at line 275 of file array.c.

{
  register uint64_t i, n1, n2;
  char **ptr;
 
  if (!(ptr = tmalloc((uint64_t)sizeof(*ptr) *(n1 = upper1 - lower1 + 1))))
    bomb("unable to allocate array (array_2d)", NULL);
 
  n2 = upper2 - lower2 + 1;
  for (i = 0; i < n1; i++) {
    if (!(ptr[i] = tmalloc((uint64_t)size * n2)))
      bomb("unable to allocate array (array_2d)", NULL);
    ptr[i] -= lower2 * size;
  }
 
  return ((void **)(ptr - lower1));
}

czarray_2d()

void ** czarray_2d	(	const uint64_t	size,
		const uint64_t	n1,
		const uint64_t	n2 )

Allocates a contiguous 2D array with zero-based indexing.

Allocates a single contiguous block of memory for a 2D array and sets up row pointers accordingly.

Parameters

size	The size of each element in the array.
n1	The number of rows.
n2	The number of columns.

Returns

Pointer to the allocated contiguous 2D array.

Definition at line 358 of file array.c.

                                                                             {
  char **ptr0;
  char *buffer;
  uint64_t i;
 
  ptr0 = (char **)tmalloc((uint64_t)(sizeof(*ptr0) * n1));
  buffer = (char *)tmalloc((uint64_t)(sizeof(*buffer) * size * n1 * n2));
  for (i = 0; i < n1; i++)
    ptr0[i] = buffer + i * size * n2;
  return ((void **)ptr0);
}

free_array_1d()

int free_array_1d	(	void *	array,
		uint64_t	size,
		uint64_t	lower_index,
		uint64_t	upper_index )

Frees a 1D array that was previously allocated.

Adjusts the pointer based on the lower index and frees the allocated memory.

Parameters

array	Pointer to the 1D array to free.
size	The size of each element in the array.
lower_index	The lower index of the array.
upper_index	The upper index of the array.

Returns

Status of the free operation (1 if successful, 0 otherwise).

Definition at line 306 of file array.c.

                                        {
  if (!array)
    return (0);
  free((char *)array + size * lower_index);
  return (1);
}

free_array_2d()

int free_array_2d	(	void **	array,
		uint64_t	size,
		uint64_t	lower1,
		uint64_t	upper1,
		uint64_t	lower2,
		uint64_t	upper2 )

Frees a 2D array and its associated memory.

Adjusts the pointer based on the lower indices and frees each row followed by the array of pointers.

Parameters

array	Pointer to the 2D array to free.
size	The size of each element in the array.
lower1	The lower index for the first dimension (rows).
upper1	The upper index for the first dimension (rows).
lower2	The lower index for the second dimension (columns).
upper2	The upper index for the second dimension (columns).

Returns

Status of the free operation (1 if successful, 0 otherwise).

Definition at line 327 of file array.c.

{
  uint64_t i, n1;
  char *ptr;
 
  if (!array)
    return (0);
 
  n1 = upper1 - lower1 + 1;
  array += lower1;
  for (i = 0; i < n1; i++) {
    if ((ptr = (char *)array[i] + size * lower2))
      free(ptr);
  }
 
  free(array);
  return (1);
}

free_czarray_2d()

int free_czarray_2d	(	void **	array,
		uint64_t	n1,
		uint64_t	n2 )

Frees a contiguous 2D array and its associated memory.

Frees the contiguous memory block holding the array elements and the array of row pointers.

Parameters

array	Pointer to the contiguous 2D array to free.
n1	The number of rows in the array.
n2	The number of columns in the array.

Returns

Status of the free operation (always returns 0).

Definition at line 405 of file array.c.

                                                            {
  free(*array);
  free(array);
  return 0;
}

free_zarray_2d()

int free_zarray_2d	(	void **	array,
		uint64_t	n1,
		uint64_t	n2 )

Frees a 2D array and its associated memory.

Frees each row of the 2D array and then frees the array of pointers itself.

Parameters

array	Pointer to the 2D array to free.
n1	The number of rows in the array.
n2	The number of columns in the array.

Returns

Status of the free operation (1 if successful, 0 otherwise).

Definition at line 155 of file array.c.

                                                           {
  void *ptr0;
 
  if (!(ptr0 = array))
    return (0);
  while (n1--) {
    if (*array) {
      tfree(*array);
      *array = NULL;
    } else
      return (0);
    array++;
  }
  return (tfree(ptr0));
}

keep_alloc_record()

void keep_alloc_record

(

char *

filename

)

Keeps a record of memory allocations by opening tracking files.

Opens tracking files for memory allocation, reallocation, and freeing based on the provided filename. If tracking files are already open, they are closed before reopening.

Parameters

filename

The base name for the tracking files.

Definition at line 33 of file array.c.

                                       {
  char s[100];
 
  if (fp_tmalloc)
    free(fp_tmalloc);
  if (fp_trealloc)
    free(fp_trealloc);
  if (fp_tfree)
    free(fp_tfree);
  sprintf(s, "%s.tmalloc", filename);
  fp_tmalloc = fopen_e(s, "w", 0);
  sprintf(s, "%s.trealloc", filename);
  fp_trealloc = fopen_e(s, "w", 0);
  sprintf(s, "%s.tfree", filename);
  fp_tfree = fopen_e(s, "w", 0);
}

resize_czarray_2d()

void ** resize_czarray_2d	(	void **	data,
		uint64_t	size,
		uint64_t	n1,
		uint64_t	n2 )

Resizes a contiguous 2D array to new dimensions.

Resizes both the array of row pointers and the contiguous memory block holding the array elements.

Parameters

data	Pointer to the original contiguous 2D array.
size	The size of each element in the array.
n1	The new number of rows.
n2	The new number of columns.

Returns

Pointer to the resized contiguous 2D array.

Definition at line 381 of file array.c.

                                                                               {
  char **ptr0;
  char *buffer;
  uint64_t i;
 
  if (!data)
    return czarray_2d(size, n1, n2);
  buffer = (char *)trealloc(*data, (uint64_t)(sizeof(char) * size * n1 * n2));
  ptr0 = (char **)trealloc(data, (uint64_t)(sizeof(char *) * n1));
  for (i = 0; i < n1; i++)
    ptr0[i] = buffer + i * size * n2;
  return ((void **)ptr0);
}

resize_zarray_2d()

void ** resize_zarray_2d	(	uint64_t	size,
		uint64_t	old_n1,
		uint64_t	old_n2,
		void **	array,
		uint64_t	n1,
		uint64_t	n2 )

Resizes an existing 2D array to new dimensions.

Resizes the array of pointers if the number of rows (n1) increases. Additionally, resizes each row to accommodate more columns (n2) if needed. If resizing fails, the function aborts the program.

Parameters

size	The size of each element in the array.
old_n1	The original number of rows.
old_n2	The original number of columns.
array	Pointer to the original 2D array.
n1	The new number of rows.
n2	The new number of columns.

Returns

Pointer to the resized 2D array.

Definition at line 117 of file array.c.

                                                                {
  void **ptr;
 
  if (n1 > old_n1) {
    /* increase length of array of pointers */
    if (!(array = (void **)trealloc((void *)array,
                                    (uint64_t)(sizeof(*array) * n1))))
      bomb("memory allocation failuire in resize_zarray_2d()", NULL);
    /* allocate memory for new pointed-to objects */
    ptr = array + n1;
    while (n1-- != old_n1)
      *--ptr = (void *)tmalloc(size * n2);
  }
 
  if (n2 > old_n2) {
    /* increase size of old pointed-to objects */
    ptr = array;
    while (old_n1--) {
      if (!(*ptr = (void *)trealloc((void *)*ptr, (uint64_t)(size * n2))))
        bomb("memory allocation failure in resize_zarray_2d()", NULL);
      ptr++;
    }
  }
 
  return (array);
}

tfree()

int tfree

(

void *

ptr

)

Frees a memory block and records the deallocation if tracking is enabled.

Frees the specified memory block and logs the deallocation if tracking is active.

Parameters

ptr	Pointer to the memory block to free.

Returns

Status of the free operation (1 if successful, 0 otherwise).

Definition at line 230 of file array.c.

                     {
  if (fp_tfree) {
    fprintf(fp_tfree, "%lx\n", (uint64_t)ptr);
    fflush(fp_tfree);
  }
  if (ptr) {
    free(ptr);
    return (1);
  }
  return (0);
}

tmalloc()

void * tmalloc

(

uint64_t

size_of_block

)

Allocates a memory block of the specified size with zero initialization.

Uses calloc to allocate memory and initializes it to zero. Tracks the allocation if tracking is enabled. If the allocation fails, the function prints an error message and aborts the program.

Parameters

size_of_block

The size of the memory block to allocate in bytes.

Returns

Pointer to the allocated memory block.

Definition at line 59 of file array.c.

                                      {
  void *ptr;
  static uint64_t total_bytes = 0;
 
  if (size_of_block <= 0)
    size_of_block = 4;
 
  /* even though the function is tMalloc, I use calloc to get memory filled
   * with zeros
   */
  if (!(ptr = calloc(size_of_block, 1))) {
    printf("error: memory allocation failure--%lu bytes requested.\n",
           size_of_block);
    printf("tmalloc() has allocated %lu bytes previously\n", total_bytes);
    abort();
  }
  if (fp_tmalloc) {
    fprintf(fp_tmalloc, "%lx  %lu\n", (uint64_t)ptr, size_of_block);
    fflush(fp_tmalloc);
  }
  total_bytes += size_of_block;
  return (ptr);
}

trealloc()

void * trealloc	(	void *	old_ptr,
		uint64_t	size_of_block )

Reallocates a memory block to a new size.

Uses realloc to resize the memory block. Tracks the reallocation if tracking is enabled. If the reallocation fails, the function prints an error message and aborts the program.

Parameters

old_ptr	Pointer to the original memory block.
size_of_block	The new size for the memory block in bytes.

Returns

Pointer to the reallocated memory block.

Definition at line 181 of file array.c.

                                                      {
  void *ptr;
  static uint64_t total_bytes = 0;
 
  if (size_of_block <= 0)
    size_of_block = 4;
 
  if (!old_ptr)
    return (tmalloc(size_of_block));
  if (!(ptr = realloc((void *)old_ptr, (uint64_t)(size_of_block)))) {
    printf("error: memory reallocation failure--%lu bytes requested.\n",
           size_of_block);
    printf("trealloc() has reallocated %lu bytes previously\n", total_bytes);
    abort();
  }
  if (fp_trealloc) {
    fprintf(fp_trealloc, "d:%lx\na:%lx  %lu\n", (uint64_t)old_ptr,
            (uint64_t)ptr, size_of_block);
    fflush(fp_trealloc);
  }
  total_bytes += size_of_block;
  return (ptr);
}

zarray_2d()

void ** zarray_2d	(	uint64_t	size,
		uint64_t	n1,
		uint64_t	n2 )

Allocates a 2D array with specified dimensions.

Allocates memory for a 2D array where each row is a contiguous block of memory. Initializes each row to zero.

Parameters

size	The size of each element in the array.
n1	The number of rows.
n2	The number of columns.

Returns

Pointer to the allocated 2D array.

Definition at line 93 of file array.c.

                                                          {
  void **ptr1, **ptr0;
 
  ptr0 = ptr1 = (void **)tmalloc((uint64_t)(sizeof(*ptr0) * n1));
  while (n1--)
    *ptr1++ = (void *)tmalloc((uint64_t)(size * n2));
  return (ptr0);
}

zero_memory()

void zero_memory	(	void *	mem,
		uint64_t	n_bytes )

Sets a block of memory to zero.

Iterates through the specified memory block and sets each byte to zero.

Parameters

mem	Pointer to the memory block.
n_bytes	The number of bytes to set to zero.

Definition at line 213 of file array.c.

                                              {
  char *cmem;
 
  if (!(cmem = mem))
    return;
  while (n_bytes--)
    *cmem++ = 0;
}

Variable Documentation

fp_tfree

FILE* fp_tfree = NULL

static

Definition at line 23 of file array.c.

fp_tmalloc

FILE* fp_tmalloc = NULL

static

Definition at line 21 of file array.c.

fp_trealloc

FILE* fp_trealloc = NULL

static

Definition at line 22 of file array.c.