-/* Block-relocating memory allocator.
+/* Block-relocating memory allocator.
Copyright (C) 1993, 1995, 2000 Free Software Foundation, Inc.
This file is part of GNU Emacs.
extern void safe_bcopy ();
#ifdef DOUG_LEA_MALLOC
-#define M_TOP_PAD -2
+#define M_TOP_PAD -2
extern int mallopt ();
#else /* not DOUG_LEA_MALLOC */
#ifndef SYSTEM_MALLOC
/* This is the size of a page. We round memory requests to this boundary. */
static int page_size;
-/* Whenever we get memory from the system, get this many extra bytes. This
+/* Whenever we get memory from the system, get this many extra bytes. This
must be a multiple of page_size. */
static int extra_bytes;
We try to make just one heap and make it larger as necessary.
But sometimes we can't do that, because we can't get contiguous
space to add onto the heap. When that happens, we start a new heap. */
-
+
typedef struct heap
{
struct heap *next;
/* These structures are allocated in the malloc arena.
The linked list is kept in order of increasing '.data' members.
The data blocks abut each other; if b->next is non-nil, then
- b->data + b->size == b->next->data.
+ b->data + b->size == b->next->data.
An element with variable==NIL denotes a freed block, which has not yet
been collected. They may only appear while r_alloc_freeze > 0, and will be
/* Calculate new locations of blocs in the list beginning with BLOC,
relocating it to start at ADDRESS, in heap HEAP. If enough space is
not presently available in our reserve, call obtain for
- more space.
-
+ more space.
+
Store the new location of each bloc in its new_data field.
Do not touch the contents of blocs or break_value. */
register bloc_ptr b = bloc;
/* No need to ever call this if arena is frozen, bug somewhere! */
- if (r_alloc_freeze_level)
+ if (r_alloc_freeze_level)
abort();
while (b)
/* Add up the size of all the following blocs. */
while (tb != NIL_BLOC)
{
- if (tb->variable)
+ if (tb->variable)
s += tb->size;
tb = tb->next;
/* Record the new address of this bloc
and update where the next bloc can start. */
b->new_data = address;
- if (b->variable)
+ if (b->variable)
address = (char *) address + b->size;
b = b->next;
}
SIZE old_size;
/* No need to ever call this if arena is frozen, bug somewhere! */
- if (r_alloc_freeze_level)
+ if (r_alloc_freeze_level)
abort();
if (bloc == NIL_BLOC || size == bloc->size)
{
b->size = 0;
b->data = b->new_data;
- }
- else
+ }
+ else
{
safe_bcopy (b->data, b->new_data, b->size);
*b->variable = b->data = b->new_data;
{
b->size = 0;
b->data = b->new_data;
- }
- else
+ }
+ else
{
safe_bcopy (b->data, b->new_data, b->size);
*b->variable = b->data = b->new_data;
bloc->variable = (POINTER *) NIL;
return;
}
-
+
resize_bloc (bloc, 0);
if (bloc == first_bloc && bloc == last_bloc)
__morecore hook values - in particular, __default_morecore in the
GNU malloc package. */
-POINTER
+POINTER
r_alloc_sbrk (size)
long size;
{
if (first_heap->bloc_start < new_bloc_start)
{
/* This is no clean solution - no idea how to do it better. */
- if (r_alloc_freeze_level)
+ if (r_alloc_freeze_level)
return NIL;
/* There is a bug here: if the above obtain call succeeded, but the
if (!*ptr)
return r_alloc (ptr, size);
- if (!size)
+ if (!size)
{
r_alloc_free (ptr);
return r_alloc (ptr, 0);
if (bloc == NIL_BLOC)
abort ();
- if (size < bloc->size)
+ if (size < bloc->size)
{
/* Wouldn't it be useful to actually resize the bloc here? */
/* I think so too, but not if it's too expensive... */
- if ((bloc->size - MEM_ROUNDUP (size) >= page_size)
- && r_alloc_freeze_level == 0)
+ if ((bloc->size - MEM_ROUNDUP (size) >= page_size)
+ && r_alloc_freeze_level == 0)
{
resize_bloc (bloc, MEM_ROUNDUP (size));
/* Never mind if this fails, just do nothing... */
else
return NIL;
}
- else
+ else
{
if (! resize_bloc (bloc, MEM_ROUNDUP (size)))
return NIL;
r_alloc_thaw ()
{
- if (! r_alloc_initialized)
+ if (! r_alloc_initialized)
r_alloc_init ();
if (--r_alloc_freeze_level < 0)
abort ();
- /* This frees all unused blocs. It is not too inefficient, as the resize
- and bcopy is done only once. Afterwards, all unreferenced blocs are
+ /* This frees all unused blocs. It is not too inefficient, as the resize
+ and bcopy is done only once. Afterwards, all unreferenced blocs are
already shrunk to zero size. */
- if (!r_alloc_freeze_level)
+ if (!r_alloc_freeze_level)
{
bloc_ptr *b = &first_bloc;
- while (*b)
- if (!(*b)->variable)
- free_bloc (*b);
- else
+ while (*b)
+ if (!(*b)->variable)
+ free_bloc (*b);
+ else
b = &(*b)->next;
}
}
if (r_alloc_initialized)
return;
r_alloc_initialized = 1;
-
+
page_size = PAGE;
#ifndef SYSTEM_MALLOC
real_morecore = __morecore;
(char *) first_heap->end - (char *) first_heap->start);
virtual_break_value = break_value = first_heap->bloc_start = first_heap->end;
#endif
-
+
use_relocatable_buffers = 1;
}