ea8c7ac7d0
This is a greatly pared down version of the full gdb-4.12, all the config stuff has been removed and the supporting libraries have been stripped to a minimum. This is a 1.1.5 only port, I'll do a more complete port for 2.0 which will have all the config stuff and will install the gnu support libraries as system libraries like we do for readline. There wasn't much point for 1.1.5 since only gdb would use them so I went for saving space instead. For 2.0 I'll config all the other gnu tools to use them as well.
248 lines
7.2 KiB
C
248 lines
7.2 KiB
C
/* Free a block of memory allocated by `mmalloc'.
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Copyright 1990, 1991, 1992 Free Software Foundation
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Written May 1989 by Mike Haertel.
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Heavily modified Mar 1992 by Fred Fish. (fnf@cygnus.com)
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA.
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The author may be reached (Email) at the address mike@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#include "mmalloc.h"
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/* Return memory to the heap.
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Like `mfree' but don't call a mfree_hook if there is one. */
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void
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__mmalloc_free (mdp, ptr)
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struct mdesc *mdp;
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PTR ptr;
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{
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int type;
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size_t block, blocks;
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register size_t i;
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struct list *prev, *next;
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block = BLOCK (ptr);
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type = mdp -> heapinfo[block].busy.type;
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switch (type)
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{
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case 0:
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/* Get as many statistics as early as we can. */
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mdp -> heapstats.chunks_used--;
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mdp -> heapstats.bytes_used -=
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mdp -> heapinfo[block].busy.info.size * BLOCKSIZE;
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mdp -> heapstats.bytes_free +=
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mdp -> heapinfo[block].busy.info.size * BLOCKSIZE;
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/* Find the free cluster previous to this one in the free list.
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Start searching at the last block referenced; this may benefit
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programs with locality of allocation. */
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i = mdp -> heapindex;
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if (i > block)
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{
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while (i > block)
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{
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i = mdp -> heapinfo[i].free.prev;
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}
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}
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else
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{
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do
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{
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i = mdp -> heapinfo[i].free.next;
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}
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while ((i != 0) && (i < block));
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i = mdp -> heapinfo[i].free.prev;
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}
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/* Determine how to link this block into the free list. */
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if (block == i + mdp -> heapinfo[i].free.size)
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{
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/* Coalesce this block with its predecessor. */
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mdp -> heapinfo[i].free.size +=
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mdp -> heapinfo[block].busy.info.size;
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block = i;
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}
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else
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{
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/* Really link this block back into the free list. */
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mdp -> heapinfo[block].free.size =
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mdp -> heapinfo[block].busy.info.size;
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mdp -> heapinfo[block].free.next = mdp -> heapinfo[i].free.next;
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mdp -> heapinfo[block].free.prev = i;
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mdp -> heapinfo[i].free.next = block;
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mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.prev = block;
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mdp -> heapstats.chunks_free++;
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}
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/* Now that the block is linked in, see if we can coalesce it
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with its successor (by deleting its successor from the list
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and adding in its size). */
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if (block + mdp -> heapinfo[block].free.size ==
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mdp -> heapinfo[block].free.next)
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{
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mdp -> heapinfo[block].free.size
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+= mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.size;
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mdp -> heapinfo[block].free.next
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= mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.next;
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mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.prev = block;
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mdp -> heapstats.chunks_free--;
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}
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/* Now see if we can return stuff to the system. */
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blocks = mdp -> heapinfo[block].free.size;
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if (blocks >= FINAL_FREE_BLOCKS && block + blocks == mdp -> heaplimit
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&& mdp -> morecore (mdp, 0) == ADDRESS (block + blocks))
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{
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register size_t bytes = blocks * BLOCKSIZE;
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mdp -> heaplimit -= blocks;
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mdp -> morecore (mdp, -bytes);
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mdp -> heapinfo[mdp -> heapinfo[block].free.prev].free.next
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= mdp -> heapinfo[block].free.next;
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mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.prev
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= mdp -> heapinfo[block].free.prev;
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block = mdp -> heapinfo[block].free.prev;
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mdp -> heapstats.chunks_free--;
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mdp -> heapstats.bytes_free -= bytes;
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}
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/* Set the next search to begin at this block. */
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mdp -> heapindex = block;
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break;
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default:
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/* Do some of the statistics. */
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mdp -> heapstats.chunks_used--;
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mdp -> heapstats.bytes_used -= 1 << type;
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mdp -> heapstats.chunks_free++;
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mdp -> heapstats.bytes_free += 1 << type;
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/* Get the address of the first free fragment in this block. */
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prev = (struct list *)
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((char *) ADDRESS(block) +
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(mdp -> heapinfo[block].busy.info.frag.first << type));
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if (mdp -> heapinfo[block].busy.info.frag.nfree ==
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(BLOCKSIZE >> type) - 1)
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{
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/* If all fragments of this block are free, remove them
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from the fragment list and free the whole block. */
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next = prev;
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for (i = 1; i < (size_t) (BLOCKSIZE >> type); ++i)
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{
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next = next -> next;
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}
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prev -> prev -> next = next;
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if (next != NULL)
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{
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next -> prev = prev -> prev;
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}
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mdp -> heapinfo[block].busy.type = 0;
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mdp -> heapinfo[block].busy.info.size = 1;
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/* Keep the statistics accurate. */
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mdp -> heapstats.chunks_used++;
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mdp -> heapstats.bytes_used += BLOCKSIZE;
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mdp -> heapstats.chunks_free -= BLOCKSIZE >> type;
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mdp -> heapstats.bytes_free -= BLOCKSIZE;
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mfree ((PTR) mdp, (PTR) ADDRESS(block));
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}
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else if (mdp -> heapinfo[block].busy.info.frag.nfree != 0)
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{
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/* If some fragments of this block are free, link this
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fragment into the fragment list after the first free
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fragment of this block. */
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next = (struct list *) ptr;
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next -> next = prev -> next;
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next -> prev = prev;
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prev -> next = next;
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if (next -> next != NULL)
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{
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next -> next -> prev = next;
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}
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++mdp -> heapinfo[block].busy.info.frag.nfree;
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}
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else
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{
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/* No fragments of this block are free, so link this
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fragment into the fragment list and announce that
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it is the first free fragment of this block. */
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prev = (struct list *) ptr;
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mdp -> heapinfo[block].busy.info.frag.nfree = 1;
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mdp -> heapinfo[block].busy.info.frag.first =
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RESIDUAL (ptr, BLOCKSIZE) >> type;
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prev -> next = mdp -> fraghead[type].next;
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prev -> prev = &mdp -> fraghead[type];
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prev -> prev -> next = prev;
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if (prev -> next != NULL)
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{
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prev -> next -> prev = prev;
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}
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}
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break;
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}
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}
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/* Return memory to the heap. */
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void
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mfree (md, ptr)
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PTR md;
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PTR ptr;
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{
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struct mdesc *mdp;
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register struct alignlist *l;
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if (ptr != NULL)
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{
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mdp = MD_TO_MDP (md);
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for (l = mdp -> aligned_blocks; l != NULL; l = l -> next)
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{
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if (l -> aligned == ptr)
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{
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l -> aligned = NULL; /* Mark the slot in the list as free. */
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ptr = l -> exact;
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break;
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}
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}
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if (mdp -> mfree_hook != NULL)
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{
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(*mdp -> mfree_hook) (md, ptr);
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}
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else
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{
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__mmalloc_free (mdp, ptr);
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}
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}
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}
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/* When using this package, provide a version of malloc/realloc/free built
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on top of it, so that if we use the default sbrk() region we will not
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collide with another malloc package trying to do the same thing, if
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the application contains any "hidden" calls to malloc/realloc/free (such
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as inside a system library). */
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void
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free (ptr)
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PTR ptr;
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{
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mfree ((PTR) NULL, ptr);
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}
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