/* Block-relocating memory allocator.
- Copyright (C) 1993, 1995, 2000-2012 Free Software Foundation, Inc.
+ Copyright (C) 1993, 1995, 2000-2014 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#else /* not emacs */
#include <stddef.h>
-
-#include <unistd.h>
#include <malloc.h>
#endif /* not emacs */
#include "getpagesize.h"
-typedef size_t SIZE;
-typedef void *POINTER;
-#define NIL ((POINTER) 0)
-
/* A flag to indicate whether we have initialized ralloc yet. For
Emacs's sake, please do not make this local to malloc_init; on some
machines, the dumping procedure makes all static variables
/* Declarations for working with the malloc, ralloc, and system breaks. */
/* Function to set the real break value. */
-POINTER (*real_morecore) (long int);
+void *(*real_morecore) (ptrdiff_t);
/* The break value, as seen by malloc. */
-static POINTER virtual_break_value;
+static void *virtual_break_value;
/* The address of the end of the last data in use by ralloc,
including relocatable blocs as well as malloc data. */
-static POINTER break_value;
+static void *break_value;
/* This is the size of a page. We round memory requests to this boundary. */
static int page_size;
/* Macros for rounding. Note that rounding to any value is possible
by changing the definition of PAGE. */
#define PAGE (getpagesize ())
-#define ROUNDUP(size) (((unsigned long int) (size) + page_size - 1) \
- & ~(page_size - 1))
+#define PAGE_ROUNDUP(size) (((size_t) (size) + page_size - 1) \
+ & ~((size_t) (page_size - 1)))
#define MEM_ALIGN sizeof (double)
-#define MEM_ROUNDUP(addr) (((unsigned long int)(addr) + MEM_ALIGN - 1) \
- & ~(MEM_ALIGN - 1))
+#define MEM_ROUNDUP(addr) (((size_t) (addr) + MEM_ALIGN - 1) \
+ & ~(MEM_ALIGN - 1))
/* The hook `malloc' uses for the function which gets more space
from the system. */
#ifndef SYSTEM_MALLOC
-extern POINTER (*__morecore) (long int);
+extern void *(*__morecore) (ptrdiff_t);
#endif
struct heap *next;
struct heap *prev;
/* Start of memory range of this heap. */
- POINTER start;
+ void *start;
/* End of memory range of this heap. */
- POINTER end;
+ void *end;
/* Start of relocatable data in this heap. */
- POINTER bloc_start;
+ void *bloc_start;
/* Start of unused space in this heap. */
- POINTER free;
+ void *free;
/* First bloc in this heap. */
struct bp *first_bloc;
/* Last bloc in this heap. */
The data blocks abut each other; if b->next is non-nil, then
b->data + b->size == b->next->data.
- An element with variable==NIL denotes a freed block, which has not yet
+ An element with variable==NULL denotes a freed block, which has not yet
been collected. They may only appear while r_alloc_freeze_level > 0,
and will be freed when the arena is thawed. Currently, these blocs are
not reusable, while the arena is frozen. Very inefficient. */
{
struct bp *next;
struct bp *prev;
- POINTER *variable;
- POINTER data;
- SIZE size;
- POINTER new_data; /* temporarily used for relocation */
+ void **variable;
+ void *data;
+ size_t size;
+ void *new_data; /* temporarily used for relocation */
struct heap *heap; /* Heap this bloc is in. */
} *bloc_ptr;
/* Find the heap that ADDRESS falls within. */
static heap_ptr
-find_heap (POINTER address)
+find_heap (void *address)
{
heap_ptr heap;
Return the address of the space if all went well, or zero if we couldn't
allocate the memory. */
-static POINTER
-obtain (POINTER address, SIZE size)
+static void *
+obtain (void *address, size_t size)
{
heap_ptr heap;
- SIZE already_available;
+ size_t already_available;
/* Find the heap that ADDRESS falls within. */
for (heap = last_heap; heap; heap = heap->prev)
get more space. */
if (heap == NIL_HEAP)
{
- POINTER new = (*real_morecore)(0);
- SIZE get;
+ void *new = real_morecore (0);
+ size_t get;
- already_available = (char *)last_heap->end - (char *)address;
+ already_available = (char *) last_heap->end - (char *) address;
if (new != last_heap->end)
{
/* Someone else called sbrk. Make a new heap. */
heap_ptr new_heap = (heap_ptr) MEM_ROUNDUP (new);
- POINTER bloc_start = (POINTER) MEM_ROUNDUP ((POINTER)(new_heap + 1));
+ void *bloc_start = (void *) MEM_ROUNDUP ((void *) (new_heap + 1));
- if ((*real_morecore) ((char *) bloc_start - (char *) new) != new)
+ if (real_morecore ((char *) bloc_start - (char *) new) != new)
return 0;
new_heap->start = new;
Get some extra, so we can come here less often. */
get = size + extra_bytes - already_available;
- get = (char *) ROUNDUP ((char *)last_heap->end + get)
+ get = (char *) PAGE_ROUNDUP ((char *) last_heap->end + get)
- (char *) last_heap->end;
- if ((*real_morecore) (get) != last_heap->end)
+ if (real_morecore (get) != last_heap->end)
return 0;
last_heap->end = (char *) last_heap->end + get;
relinquish (void)
{
register heap_ptr h;
- long excess = 0;
+ ptrdiff_t excess = 0;
/* Add the amount of space beyond break_value
in all heaps which have extend beyond break_value at all. */
? h->bloc_start : break_value);
}
- if (excess > extra_bytes * 2 && (*real_morecore) (0) == last_heap->end)
+ if (excess > extra_bytes * 2 && real_morecore (0) == last_heap->end)
{
/* Keep extra_bytes worth of empty space.
And don't free anything unless we can free at least extra_bytes. */
excess -= extra_bytes;
- if ((char *)last_heap->end - (char *)last_heap->bloc_start <= excess)
+ if ((char *) last_heap->end - (char *) last_heap->bloc_start <= excess)
{
- /* This heap should have no blocs in it. */
+ heap_ptr lh_prev;
+
+ /* This heap should have no blocs in it. If it does, we
+ cannot return it to the system. */
if (last_heap->first_bloc != NIL_BLOC
|| last_heap->last_bloc != NIL_BLOC)
- emacs_abort ();
+ return;
/* Return the last heap, with its header, to the system. */
- excess = (char *)last_heap->end - (char *)last_heap->start;
- last_heap = last_heap->prev;
- last_heap->next = NIL_HEAP;
+ excess = (char *) last_heap->end - (char *) last_heap->start;
+ lh_prev = last_heap->prev;
+ /* If the system doesn't want that much memory back, leave
+ last_heap unaltered to reflect that. This can occur if
+ break_value is still within the original data segment. */
+ if (real_morecore (- excess) != 0)
+ {
+ last_heap = lh_prev;
+ last_heap->next = NIL_HEAP;
+ }
}
else
{
- excess = (char *) last_heap->end
- - (char *) ROUNDUP ((char *)last_heap->end - excess);
- last_heap->end = (char *) last_heap->end - excess;
- }
-
- if ((*real_morecore) (- excess) == 0)
- {
- /* If the system didn't want that much memory back, adjust
- the end of the last heap to reflect that. This can occur
- if break_value is still within the original data segment. */
- last_heap->end = (char *) last_heap->end + excess;
- /* Make sure that the result of the adjustment is accurate.
- It should be, for the else clause above; the other case,
- which returns the entire last heap to the system, seems
- unlikely to trigger this mode of failure. */
- if (last_heap->end != (*real_morecore) (0))
- emacs_abort ();
+ excess = ((char *) last_heap->end
+ - (char *) PAGE_ROUNDUP ((char *) last_heap->end - excess));
+ /* If the system doesn't want that much memory back, leave
+ the end of the last heap unchanged to reflect that. This
+ can occur if break_value is still within the original
+ data segment. */
+ if (real_morecore (- excess) != 0)
+ last_heap->end = (char *) last_heap->end - excess;
}
}
}
to that block. */
static bloc_ptr
-find_bloc (POINTER *ptr)
+find_bloc (void **ptr)
{
- register bloc_ptr p = first_bloc;
+ bloc_ptr p = first_bloc;
while (p != NIL_BLOC)
{
memory for the new block. */
static bloc_ptr
-get_bloc (SIZE size)
+get_bloc (size_t size)
{
- register bloc_ptr new_bloc;
- register heap_ptr heap;
+ bloc_ptr new_bloc;
+ heap_ptr heap;
if (! (new_bloc = malloc (BLOC_PTR_SIZE))
|| ! (new_bloc->data = obtain (break_value, size)))
new_bloc->size = size;
new_bloc->next = NIL_BLOC;
- new_bloc->variable = (POINTER *) NIL;
+ new_bloc->variable = NULL;
new_bloc->new_data = 0;
/* Record in the heap that this space is in use. */
Do not touch the contents of blocs or break_value. */
static int
-relocate_blocs (bloc_ptr bloc, heap_ptr heap, POINTER address)
+relocate_blocs (bloc_ptr bloc, heap_ptr heap, void *address)
{
- register bloc_ptr b = bloc;
+ bloc_ptr b = bloc;
/* No need to ever call this if arena is frozen, bug somewhere! */
if (r_alloc_freeze_level)
get enough new space to hold BLOC and all following blocs. */
if (heap == NIL_HEAP)
{
- register bloc_ptr tb = b;
- register SIZE s = 0;
+ bloc_ptr tb = b;
+ size_t s = 0;
/* Add up the size of all the following blocs. */
while (tb != NIL_BLOC)
that come after BLOC in memory. */
static int
-resize_bloc (bloc_ptr bloc, SIZE size)
+resize_bloc (bloc_ptr bloc, size_t size)
{
- register bloc_ptr b;
+ bloc_ptr b;
heap_ptr heap;
- POINTER address;
- SIZE old_size;
+ void *address;
+ size_t old_size;
/* No need to ever call this if arena is frozen, bug somewhere! */
if (r_alloc_freeze_level)
if (r_alloc_freeze_level)
{
- bloc->variable = (POINTER *) NIL;
+ bloc->variable = NULL;
return;
}
__morecore hook values - in particular, __default_morecore in the
GNU malloc package. */
-static POINTER
-r_alloc_sbrk (long int size)
+static void *
+r_alloc_sbrk (ptrdiff_t size)
{
- register bloc_ptr b;
- POINTER address;
+ bloc_ptr b;
+ void *address;
if (! r_alloc_initialized)
r_alloc_init ();
if (use_relocatable_buffers <= 0)
- return (*real_morecore) (size);
+ return real_morecore (size);
if (size == 0)
return virtual_break_value;
/* Allocate a page-aligned space. GNU malloc would reclaim an
extra space if we passed an unaligned one. But we could
not always find a space which is contiguous to the previous. */
- POINTER new_bloc_start;
+ void *new_bloc_start;
heap_ptr h = first_heap;
- SIZE get = ROUNDUP (size);
+ size_t get = PAGE_ROUNDUP (size);
- address = (POINTER) ROUNDUP (virtual_break_value);
+ address = (void *) PAGE_ROUNDUP (virtual_break_value);
/* Search the list upward for a heap which is large enough. */
- while ((char *) h->end < (char *) MEM_ROUNDUP ((char *)address + get))
+ while ((char *) h->end < (char *) MEM_ROUNDUP ((char *) address + get))
{
h = h->next;
if (h == NIL_HEAP)
break;
- address = (POINTER) ROUNDUP (h->start);
+ address = (void *) PAGE_ROUNDUP (h->start);
}
/* If not found, obtain more space. */
return 0;
if (first_heap == last_heap)
- address = (POINTER) ROUNDUP (virtual_break_value);
+ address = (void *) PAGE_ROUNDUP (virtual_break_value);
else
- address = (POINTER) ROUNDUP (last_heap->start);
+ address = (void *) PAGE_ROUNDUP (last_heap->start);
h = last_heap;
}
- new_bloc_start = (POINTER) MEM_ROUNDUP ((char *)address + get);
+ new_bloc_start = (void *) MEM_ROUNDUP ((char *) address + get);
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)
- return NIL;
+ return NULL;
/* There is a bug here: if the above obtain call succeeded, but the
relocate_blocs call below does not succeed, we need to free
if (! relocate_blocs (first_bloc, h, new_bloc_start))
return 0;
- /* Note that (POINTER)(h+1) <= new_bloc_start since
+ /* Note that (char *) (h + 1) <= (char *) new_bloc_start since
get >= page_size, so the following does not destroy the heap
header. */
for (b = last_bloc; b != NIL_BLOC; b = b->prev)
}
else /* size < 0 */
{
- SIZE excess = (char *)first_heap->bloc_start
- - ((char *)virtual_break_value + size);
+ size_t excess = ((char *) first_heap->bloc_start
+ - ((char *) virtual_break_value + size));
address = virtual_break_value;
{
excess -= extra_bytes;
first_heap->bloc_start
- = (POINTER) MEM_ROUNDUP ((char *)first_heap->bloc_start - excess);
+ = (void *) MEM_ROUNDUP ((char *) first_heap->bloc_start - excess);
relocate_blocs (first_bloc, first_heap, first_heap->bloc_start);
}
}
- if ((char *)virtual_break_value + size < (char *)first_heap->start)
+ if ((char *) virtual_break_value + size < (char *) first_heap->start)
{
/* We found an additional space below the first heap */
- first_heap->start = (POINTER) ((char *)virtual_break_value + size);
+ first_heap->start = (void *) ((char *) virtual_break_value + size);
}
}
- virtual_break_value = (POINTER) ((char *)address + size);
+ virtual_break_value = (void *) ((char *) address + size);
break_value = (last_bloc
? (char *) last_bloc->data + last_bloc->size
: (char *) first_heap->bloc_start);
If we can't allocate the necessary memory, set *PTR to zero, and
return zero. */
-POINTER
-r_alloc (POINTER *ptr, SIZE size)
+void *
+r_alloc (void **ptr, size_t size)
{
- register bloc_ptr new_bloc;
+ bloc_ptr new_bloc;
if (! r_alloc_initialized)
r_alloc_init ();
Store 0 in *PTR to show there's no block allocated. */
void
-r_alloc_free (register POINTER *ptr)
+r_alloc_free (void **ptr)
{
- register bloc_ptr dead_bloc;
+ bloc_ptr dead_bloc;
if (! r_alloc_initialized)
r_alloc_init ();
If more memory cannot be allocated, then leave *PTR unchanged, and
return zero. */
-POINTER
-r_re_alloc (POINTER *ptr, SIZE size)
+void *
+r_re_alloc (void **ptr, size_t size)
{
- register bloc_ptr bloc;
+ bloc_ptr bloc;
if (! r_alloc_initialized)
r_alloc_init ();
{
new_bloc->variable = ptr;
*ptr = new_bloc->data;
- bloc->variable = (POINTER *) NIL;
+ bloc->variable = NULL;
}
else
- return NIL;
+ return NULL;
}
else
{
if (! resize_bloc (bloc, MEM_ROUNDUP (size)))
- return NIL;
+ return NULL;
}
}
return *ptr;
return;
assert (first_heap);
- assert (last_heap->end <= (POINTER) sbrk (0));
- assert ((POINTER) first_heap < first_heap->start);
+ assert (last_heap->end <= (void *) sbrk (0));
+ assert ((void *) first_heap < first_heap->start);
assert (first_heap->start <= virtual_break_value);
assert (virtual_break_value <= first_heap->end);
for (h = first_heap; h; h = h->next)
{
assert (h->prev == ph);
- assert ((POINTER) ROUNDUP (h->end) == h->end);
+ assert ((void *) PAGE_ROUNDUP (h->end) == h->end);
#if 0 /* ??? The code in ralloc.c does not really try to ensure
the heap start has any sort of alignment.
Perhaps it should. */
- assert ((POINTER) MEM_ROUNDUP (h->start) == h->start);
+ assert ((void *) MEM_ROUNDUP (h->start) == h->start);
#endif
- assert ((POINTER) MEM_ROUNDUP (h->bloc_start) == h->bloc_start);
+ assert ((void *) MEM_ROUNDUP (h->bloc_start) == h->bloc_start);
assert (h->start <= h->bloc_start && h->bloc_start <= h->end);
if (ph)
{
assert (ph->end < h->start);
- assert (h->start <= (POINTER)h && (POINTER)(h+1) <= h->bloc_start);
+ assert (h->start <= (void *) h && (void *) (h + 1) <= h->bloc_start);
}
if (h->bloc_start <= break_value && break_value <= h->end)
for (b = first_bloc; b; b = b->next)
{
assert (b->prev == pb);
- assert ((POINTER) MEM_ROUNDUP (b->data) == b->data);
- assert ((SIZE) MEM_ROUNDUP (b->size) == b->size);
+ assert ((void *) MEM_ROUNDUP (b->data) == b->data);
+ assert ((size_t) MEM_ROUNDUP (b->size) == b->size);
ph = 0;
for (h = first_heap; h; h = h->next)
is checked to ensure that memory corruption does not occur due to
misuse. */
void
-r_alloc_reset_variable (POINTER *old, POINTER *new)
+r_alloc_reset_variable (void **old, void **new)
{
bloc_ptr bloc = first_bloc;
first_heap = last_heap = &heap_base;
first_heap->next = first_heap->prev = NIL_HEAP;
first_heap->start = first_heap->bloc_start
- = virtual_break_value = break_value = (*real_morecore) (0);
- if (break_value == NIL)
+ = virtual_break_value = break_value = real_morecore (0);
+ if (break_value == NULL)
emacs_abort ();
- extra_bytes = ROUNDUP (50000);
+ extra_bytes = PAGE_ROUNDUP (50000);
#endif
#ifdef DOUG_LEA_MALLOC
- BLOCK_INPUT;
+ block_input ();
mallopt (M_TOP_PAD, 64 * 4096);
- UNBLOCK_INPUT;
+ unblock_input ();
#else
#ifndef SYSTEM_MALLOC
/* Give GNU malloc's morecore some hysteresis so that we move all
the relocatable blocks much less often. The number used to be
64, but alloc.c would override that with 32 in code that was
removed when SYNC_INPUT became the only input handling mode.
- That code was condition on !DOUG_LEA_MALLOC, so the call to
+ That code was conditioned on !DOUG_LEA_MALLOC, so the call to
mallopt above is left unchanged. (Actually, I think there's no
system nowadays that uses DOUG_LEA_MALLOC and also uses
REL_ALLOC.) */
#endif
#ifndef SYSTEM_MALLOC
- first_heap->end = (POINTER) ROUNDUP (first_heap->start);
+ first_heap->end = (void *) PAGE_ROUNDUP (first_heap->start);
/* The extra call to real_morecore guarantees that the end of the
address space is a multiple of page_size, even if page_size is
which page_size is stored. This allows a binary to be built on a
system with one page size and run on a system with a smaller page
size. */
- (*real_morecore) ((char *) first_heap->end - (char *) first_heap->start);
+ real_morecore ((char *) first_heap->end - (char *) first_heap->start);
/* Clear the rest of the last page; this memory is in our address space
even though it is after the sbrk value. */
HCoop / bpt / emacs.git / blobdiff