freebsd-dev/contrib/gcc/f/malloc.c

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1999-08-26 09:30:50 +00:00
/* malloc.c -- Implementation File (module.c template V1.0)
Copyright (C) 1995 Free Software Foundation, Inc.
Contributed by James Craig Burley.
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This file is part of GNU Fortran.
GNU Fortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Fortran 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Fortran; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
Related Modules:
None
Description:
Fast pool-based memory allocation.
Modifications:
*/
/* Include files. */
#include "proj.h"
#include "malloc.h"
/* Externals defined here. */
struct _malloc_root_ malloc_root_
=
{
{
&malloc_root_.malloc_pool_image_,
&malloc_root_.malloc_pool_image_,
(mallocPool) &malloc_root_.malloc_pool_image_.eldest,
(mallocPool) &malloc_root_.malloc_pool_image_.eldest,
(mallocArea_) &malloc_root_.malloc_pool_image_.first,
(mallocArea_) &malloc_root_.malloc_pool_image_.first,
0,
#if MALLOC_DEBUG
0, 0, 0, 0, 0, 0, 0, { '/' }
#else
{ 0 }
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#endif
},
};
/* Simple definitions and enumerations. */
/* Internal typedefs. */
/* Private include files. */
/* Internal structure definitions. */
/* Static objects accessed by functions in this module. */
static void *malloc_reserve_ = NULL; /* For crashes. */
#if MALLOC_DEBUG
static const char *const malloc_types_[] =
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{"KS", "KSR", "NF", "NFR", "US", "USR"};
#endif
/* Static functions (internal). */
static void malloc_kill_area_ (mallocPool pool, mallocArea_ a);
#if MALLOC_DEBUG
static void malloc_verify_area_ (mallocPool pool, mallocArea_ a);
#endif
/* Internal macros. */
#if MALLOC_DEBUG
#define malloc_kill_(ptr,s) do {memset((ptr),127,(s));free((ptr));} while(0)
#else
#define malloc_kill_(ptr,s) free((ptr))
#endif
/* malloc_kill_area_ -- Kill storage area and its object
malloc_kill_area_(mallocPool pool,mallocArea_ area);
Does the actual killing of a storage area. */
static void
malloc_kill_area_ (mallocPool pool UNUSED, mallocArea_ a)
{
#if MALLOC_DEBUG
assert (strcmp (a->name, ((char *) (a->where)) + a->size) == 0);
#endif
malloc_kill_ (a->where, a->size);
a->next->previous = a->previous;
a->previous->next = a->next;
#if MALLOC_DEBUG
pool->freed += a->size;
pool->frees++;
#endif
malloc_kill_ (a,
offsetof (struct _malloc_area_, name)
+ strlen (a->name) + 1);
}
/* malloc_verify_area_ -- Verify storage area and its object
malloc_verify_area_(mallocPool pool,mallocArea_ area);
Does the actual verifying of a storage area. */
#if MALLOC_DEBUG
static void
malloc_verify_area_ (mallocPool pool UNUSED, mallocArea_ a UNUSED)
{
mallocSize s = a->size;
assert (strcmp (a->name, ((char *) (a->where)) + s) == 0);
}
#endif
/* malloc_init -- Initialize malloc cluster
malloc_init();
Call malloc_init before you do anything else. */
void
malloc_init ()
{
if (malloc_reserve_ != NULL)
return;
malloc_reserve_ = xmalloc (20 * 1024); /* In case of crash, free this first. */
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}
/* malloc_pool_display -- Display a pool
mallocPool p;
malloc_pool_display(p);
Displays information associated with the pool and its subpools. */
void
malloc_pool_display (mallocPool p UNUSED)
{
#if MALLOC_DEBUG
mallocPool q;
mallocArea_ a;
fprintf (dmpout, "Pool \"%s\": bytes allocated=%lu, freed=%lu, old sizes=%lu, new sizes\
=%lu,\n allocations=%lu, frees=%lu, resizes=%lu, uses=%lu\n Subpools:\n",
p->name, p->allocated, p->freed, p->old_sizes, p->new_sizes, p->allocations,
p->frees, p->resizes, p->uses);
for (q = p->eldest; q != (mallocPool) & p->eldest; q = q->next)
fprintf (dmpout, " \"%s\"\n", q->name);
fprintf (dmpout, " Storage areas:\n");
for (a = p->first; a != (mallocArea_) & p->first; a = a->next)
{
fprintf (dmpout, " ");
malloc_display_ (a);
}
#endif
}
/* malloc_pool_kill -- Destroy a pool
mallocPool p;
malloc_pool_kill(p);
Releases all storage associated with the pool and its subpools. */
void
malloc_pool_kill (mallocPool p)
{
mallocPool q;
mallocArea_ a;
if (--p->uses != 0)
return;
#if 0
malloc_pool_display (p);
#endif
assert (p->next->previous == p);
assert (p->previous->next == p);
/* Kill off all the subpools. */
while ((q = p->eldest) != (mallocPool) &p->eldest)
{
q->uses = 1; /* Force the kill. */
malloc_pool_kill (q);
}
/* Now free all the storage areas. */
while ((a = p->first) != (mallocArea_) & p->first)
{
malloc_kill_area_ (p, a);
}
/* Now remove from list of sibling pools. */
p->next->previous = p->previous;
p->previous->next = p->next;
/* Finally, free the pool itself. */
malloc_kill_ (p,
offsetof (struct _malloc_pool_, name)
+ strlen (p->name) + 1);
}
/* malloc_pool_new -- Make a new pool
mallocPool p;
p = malloc_pool_new("My new pool",malloc_pool_image(),1024);
Makes a new pool with the given name and default new-chunk allocation. */
mallocPool
malloc_pool_new (const char *name, mallocPool parent,
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unsigned long chunks UNUSED)
{
mallocPool p;
if (parent == NULL)
parent = malloc_pool_image ();
p = malloc_new_ (offsetof (struct _malloc_pool_, name)
+ (MALLOC_DEBUG ? strlen (name) + 1 : 0));
p->next = (mallocPool) &(parent->eldest);
p->previous = parent->youngest;
parent->youngest->next = p;
parent->youngest = p;
p->eldest = (mallocPool) &(p->eldest);
p->youngest = (mallocPool) &(p->eldest);
p->first = (mallocArea_) &(p->first);
p->last = (mallocArea_) &(p->first);
p->uses = 1;
#if MALLOC_DEBUG
p->allocated = p->freed = p->old_sizes = p->new_sizes = p->allocations
= p->frees = p->resizes = 0;
strcpy (p->name, name);
#endif
return p;
}
/* malloc_pool_use -- Use an existing pool
mallocPool p;
p = malloc_pool_new(pool);
Increments use count for pool; means a matching malloc_pool_kill must
be performed before a subsequent one will actually kill the pool. */
mallocPool
malloc_pool_use (mallocPool pool)
{
++pool->uses;
return pool;
}
/* malloc_display_ -- Display info on a mallocArea_
mallocArea_ a;
malloc_display_(a);
Simple. */
void
malloc_display_ (mallocArea_ a UNUSED)
{
#if MALLOC_DEBUG
fprintf (dmpout, "At %08lX, size=%" mallocSize_f "u, type=%s, \"%s\"\n",
(unsigned long) a->where, a->size, malloc_types_[a->type], a->name);
#endif
}
/* malloc_find_inpool_ -- Find mallocArea_ for object in pool
mallocPool pool;
void *ptr;
mallocArea_ a;
a = malloc_find_inpool_(pool,ptr);
Search for object in list of mallocArea_s, die if not found. */
mallocArea_
malloc_find_inpool_ (mallocPool pool, void *ptr)
{
mallocArea_ a;
mallocArea_ b = (mallocArea_) &pool->first;
int n = 0;
for (a = pool->first; a != (mallocArea_) &pool->first; a = a->next)
{
assert (("Infinite loop detected" != NULL) && (a != b));
if (a->where == ptr)
return a;
++n;
if (n & 1)
b = b->next;
}
assert ("Couldn't find object in pool!" == NULL);
return NULL;
}
/* malloc_kill_inpool_ -- Kill object
malloc_kill_inpool_(NULL,MALLOC_typeUS_,ptr,size_in_bytes);
Find the mallocArea_ for the pointer, make sure the type is proper, and
kill both of them. */
void
malloc_kill_inpool_ (mallocPool pool, mallocType_ type UNUSED,
void *ptr, mallocSize s UNUSED)
{
mallocArea_ a;
if (pool == NULL)
pool = malloc_pool_image ();
#if MALLOC_DEBUG
assert ((pool == malloc_pool_image ())
|| malloc_pool_find_ (pool, malloc_pool_image ()));
#endif
a = malloc_find_inpool_ (pool, ptr);
#if MALLOC_DEBUG
assert (a->type == type);
if ((type != MALLOC_typeUS_) && (type != MALLOC_typeUSR_))
assert (a->size == s);
#endif
malloc_kill_area_ (pool, a);
}
/* malloc_new_ -- Allocate new object, die if unable
ptr = malloc_new_(size_in_bytes);
Call malloc, bomb if it returns NULL. */
void *
malloc_new_ (mallocSize s)
{
void *ptr;
unsigned ss = s;
#if MALLOC_DEBUG && 0
assert (s == (mallocSize) ss);/* Else alloc is too big for this
library/sys. */
#endif
ptr = xmalloc (ss);
#if MALLOC_DEBUG
memset (ptr, 126, ss); /* Catch some kinds of errors more
quickly/reliably. */
#endif
return ptr;
}
/* malloc_new_inpool_ -- Allocate new object, die if unable
ptr = malloc_new_inpool_(NULL,MALLOC_typeUS_,"object",size_in_bytes);
Allocate the structure and allocate a mallocArea_ to describe it, then
add it to the list of mallocArea_s for the pool. */
void *
malloc_new_inpool_ (mallocPool pool, mallocType_ type, const char *name, mallocSize s)
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{
void *ptr;
mallocArea_ a;
unsigned short i;
if (pool == NULL)
pool = malloc_pool_image ();
#if MALLOC_DEBUG
assert ((pool == malloc_pool_image ())
|| malloc_pool_find_ (pool, malloc_pool_image ()));
#endif
ptr = malloc_new_ (s + (i = (MALLOC_DEBUG ? strlen (name) + 1 : 0)));
#if MALLOC_DEBUG
strcpy (((char *) (ptr)) + s, name);
#endif
a = malloc_new_ (offsetof (struct _malloc_area_, name) + i);
switch (type)
{ /* A little optimization to speed up killing
of non-permanent stuff. */
case MALLOC_typeKP_:
case MALLOC_typeKPR_:
a->next = (mallocArea_) &pool->first;
break;
default:
a->next = pool->first;
break;
}
a->previous = a->next->previous;
a->next->previous = a;
a->previous->next = a;
a->where = ptr;
#if MALLOC_DEBUG
a->size = s;
a->type = type;
strcpy (a->name, name);
pool->allocated += s;
pool->allocations++;
#endif
return ptr;
}
/* malloc_new_zinpool_ -- Allocate new zeroed object, die if unable
ptr = malloc_new_zinpool_(NULL,MALLOC_typeUS_,"object",size_in_bytes,0);
Like malloc_new_inpool_, but zeros out all the bytes in the area (assuming
you pass it a 0). */
void *
malloc_new_zinpool_ (mallocPool pool, mallocType_ type, const char *name, mallocSize s,
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int z)
{
void *ptr;
ptr = malloc_new_inpool_ (pool, type, name, s);
memset (ptr, z, s);
return ptr;
}
/* malloc_pool_find_ -- See if pool is a descendant of another pool
if (malloc_pool_find_(target_pool,parent_pool)) ...;
Recursive descent on each of the children of the parent pool, after
first checking the children themselves. */
char
malloc_pool_find_ (mallocPool pool, mallocPool parent)
{
mallocPool p;
for (p = parent->eldest; p != (mallocPool) & parent->eldest; p = p->next)
{
if ((p == pool) || malloc_pool_find_ (pool, p))
return 1;
}
return 0;
}
/* malloc_resize_inpool_ -- Resize existing object in pool
ptr = malloc_resize_inpool_(NULL,MALLOC_typeUSR_,ptr,new_size,old_size);
Find the object's mallocArea_, check it out, then do the resizing. */
void *
malloc_resize_inpool_ (mallocPool pool, mallocType_ type UNUSED,
void *ptr, mallocSize ns, mallocSize os UNUSED)
{
mallocArea_ a;
if (pool == NULL)
pool = malloc_pool_image ();
#if MALLOC_DEBUG
assert ((pool == malloc_pool_image ())
|| malloc_pool_find_ (pool, malloc_pool_image ()));
#endif
a = malloc_find_inpool_ (pool, ptr);
#if MALLOC_DEBUG
assert (a->type == type);
if ((type == MALLOC_typeKSR_) || (type == MALLOC_typeKPR_))
assert (a->size == os);
assert (strcmp (a->name, ((char *) (ptr)) + os) == 0);
#endif
ptr = malloc_resize_ (ptr, ns + (MALLOC_DEBUG ? strlen (a->name) + 1: 0));
a->where = ptr;
#if MALLOC_DEBUG
a->size = ns;
strcpy (((char *) (ptr)) + ns, a->name);
pool->old_sizes += os;
pool->new_sizes += ns;
pool->resizes++;
#endif
return ptr;
}
/* malloc_resize_ -- Reallocate object, die if unable
ptr = malloc_resize_(ptr,size_in_bytes);
Call realloc, bomb if it returns NULL. */
void *
malloc_resize_ (void *ptr, mallocSize s)
{
int ss = s;
#if MALLOC_DEBUG && 0
assert (s == (mallocSize) ss);/* Too big if failure here. */
#endif
ptr = xrealloc (ptr, ss);
return ptr;
}
/* malloc_verify_inpool_ -- Verify object
Find the mallocArea_ for the pointer, make sure the type is proper, and
verify both of them. */
void
malloc_verify_inpool_ (mallocPool pool UNUSED, mallocType_ type UNUSED,
void *ptr UNUSED, mallocSize s UNUSED)
{
#if MALLOC_DEBUG
mallocArea_ a;
if (pool == NULL)
pool = malloc_pool_image ();
assert ((pool == malloc_pool_image ())
|| malloc_pool_find_ (pool, malloc_pool_image ()));
a = malloc_find_inpool_ (pool, ptr);
assert (a->type == type);
if ((type != MALLOC_typeUS_) && (type != MALLOC_typeUSR_))
assert (a->size == s);
malloc_verify_area_ (pool, a);
#endif
}