OpenXM_contrib/gmp/stack-alloc.c - diff

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Diff for /OpenXM_contrib/gmp/Attic/stack-alloc.c between version 1.1.1.1 and 1.1.1.2

version 1.1.1.1, 2000/01/10 15:35:22

version 1.1.1.2, 2000/09/09 14:12:16

Line 1

/* Stack allocation routines. This is intended for machines without support

for the `alloca' function.

This file is part of the GNU MP Library.

The GNU MP 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

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation; either version 2 of the License, or (at your

the Free Software Foundation; either version 2.1 of the License, or (at your

option) any later version.

The GNU MP 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

or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public

License for more details.

You should have received a copy of the GNU Library General Public License

You should have received a copy of the GNU Lesser General Public License

along with the GNU MP Library; see the file COPYING.LIB. If not, write to

the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,

MA 02111-1307, USA. */

#include "stack-alloc.h"

#define __need_size_t

#include <stddef.h>

#undef __need_size_t

/* gmp-impl.h and stack-alloc.h conflict when not USE_STACK_ALLOC, so these

declarations are copied here */

#if __STDC__

extern void * (*__gmp_allocate_func) (size_t);

extern void (*__gmp_free_func) (void *, size_t);

#else

extern void * (*__gmp_allocate_func) ();

extern void (*__gmp_free_func) ();

#endif

typedef struct tmp_stack tmp_stack;

void *malloc ();

static unsigned long max_total_allocation = 0;

static unsigned long current_total_allocation = 0;

static tmp_stack xxx = {&xxx, &xxx, 0};

static tmp_stack *current = &xxx;

/* The rounded size of the header of each allocation block. */

#define HSIZ ((sizeof (tmp_stack) + __TMP_ALIGN - 1) & -__TMP_ALIGN)

/* Allocate a block of exactly <size> bytes. This should only be called

through the TMP_ALLOC macro, which takes care of rounding/alignment. */

void *

__tmp_alloc (size)

#if __STDC__

__gmp_tmp_alloc (unsigned long size)

#else

__gmp_tmp_alloc (size)

unsigned long size;

#endif

{

void *this;

void *that;

if (size > (char *) current->end - (char *) current->alloc_point)

{

Line 56 __tmp_alloc (size)

Line 76 __tmp_alloc (size)

/* We need more temporary memory than ever before. Increase

for future needs. */

now = now * 3 / 2;

chunk_size = now - current_total_allocation + sizeof (tmp_stack);

chunk_size = now - current_total_allocation + HSIZ;

current_total_allocation = now;

max_total_allocation = current_total_allocation;

}

else

{

chunk_size = max_total_allocation - current_total_allocation + sizeof (tmp_stack);

chunk_size = max_total_allocation - current_total_allocation + HSIZ;

current_total_allocation = max_total_allocation;

}

chunk = malloc (chunk_size);

chunk = (*__gmp_allocate_func) (chunk_size);

header = chunk;

header = (tmp_stack *) chunk;

header->end = (char *) chunk + chunk_size;

header->alloc_point = (char *) chunk + sizeof (tmp_stack);

header->alloc_point = (char *) chunk + HSIZ;

header->prev = current;

current = header;

}

this = current->alloc_point;

that = current->alloc_point;

current->alloc_point = (char *) this + size;

current->alloc_point = (char *) that + size;

return this;

return that;

}

/* Typically called at function entry. <mark> is assigned so that __tmp_free

/* Typically called at function entry. <mark> is assigned so that

can later be used to reclaim all subsecuently allocated storage. */

__gmp_tmp_free can later be used to reclaim all subsequently allocated

storage. */

void

__tmp_mark (mark)

#if __STDC__

__gmp_tmp_mark (tmp_marker *mark)

#else

__gmp_tmp_mark (mark)

tmp_marker *mark;

#endif

{

mark->which_chunk = current;

mark->alloc_point = current->alloc_point;

}

/* Free everything allocated since <mark> was assigned by __tmp_mark */

/* Free everything allocated since <mark> was assigned by __gmp_tmp_mark */

void

__tmp_free (mark)

#if __STDC__

__gmp_tmp_free (tmp_marker *mark)

#else

__gmp_tmp_free (mark)

tmp_marker *mark;

#endif

{

while (mark->which_chunk != current)

{

Line 100 __tmp_free (mark)

Line 129 __tmp_free (mark)

tmp = current;

current = tmp->prev;

current_total_allocation -= (((char *) (tmp->end) - (char *) tmp)

current_total_allocation -= (((char *) (tmp->end) - (char *) tmp) - HSIZ);

- sizeof (tmp_stack));

(*__gmp_free_func) (tmp, (char *) tmp->end - (char *) tmp);

free (tmp);

}

current->alloc_point = mark->alloc_point;

}

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