-/* Free a block of memory allocated by `mmalloc'.
- Copyright 1990, 1991, 1992 Free Software Foundation
+/* Free a block of memory allocated by `mmalloc'. */
- Written May 1989 by Mike Haertel.
- Heavily modified Mar 1992 by Fred Fish. (fnf@cygnus.com) */
-
-/* Copyright (c) 2010-2014. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2010-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+/* Copyright 1990, 1991, 1992 Free Software Foundation
+
+ Written May 1989 by Mike Haertel.
+ Heavily modified Mar 1992 by Fred Fish. (fnf@cygnus.com) */
+
#include "mmprivate.h"
#include "xbt/ex.h"
#include "mc/mc.h"
/* Return memory to the heap. */
void mfree(struct mdesc *mdp, void *ptr)
{
- int type;
- size_t block, frag_nb;
- register size_t i;
+ size_t frag_nb;
+ size_t i;
int it;
- mmalloc_paranoia(mdp);
-// fprintf(stderr,"free(%p)\n",ptr);
-
if (ptr == NULL)
return;
- block = BLOCK(ptr);
+ size_t block = BLOCK(ptr);
if ((char *) ptr < (char *) mdp->heapbase || block > mdp->heapsize) {
fprintf(stderr,"Ouch, this pointer is not mine, I refuse to free it. Give me valid pointers, or give me death!!\n");
abort();
}
- type = mdp->heapinfo[block].type;
+ int type = mdp->heapinfo[block].type;
switch (type) {
- case -1: /* Already free */
+ case MMALLOC_TYPE_HEAPINFO:
+ UNLOCK(mdp);
+ THROWF(system_error, 0, "Asked to free a fragment in a heapinfo block. I'm confused.\n");
+ break;
+
+ case MMALLOC_TYPE_FREE: /* Already free */
UNLOCK(mdp);
- THROWF(system_error, 0, "Asked to free a fragment in a block that is already free. I'm puzzled\n");
+ THROWF(system_error, 0, "Asked to free a fragment in a block that is already free. I'm puzzled.\n");
break;
-
- case 0:
+
+ case MMALLOC_TYPE_UNFRAGMENTED:
/* Get as many statistics as early as we can. */
mdp -> heapstats.chunks_used--;
mdp -> heapstats.bytes_used -=
mdp -> heapstats.bytes_free +=
mdp -> heapinfo[block].busy_block.size * BLOCKSIZE;
- if(MC_is_active()){
- if(mdp->heapinfo[block].busy_block.ignore > 0)
- MC_remove_ignore_heap(ptr, mdp -> heapinfo[block].busy_block.busy_size);
- }
+ if (MC_is_active() && mdp->heapinfo[block].busy_block.ignore > 0)
+ MC_unignore_heap(ptr, mdp->heapinfo[block].busy_block.busy_size);
/* Find the free cluster previous to this one in the free list.
Start searching at the last block referenced; this may benefit
mdp->heapinfo[i].free_block.size += mdp->heapinfo[block].busy_block.size;
/* Mark all my ex-blocks as free */
for (it=0; it<mdp->heapinfo[block].busy_block.size; it++) {
- if (mdp->heapinfo[block+it].type <0) {
+ if (mdp->heapinfo[block+it].type < 0) {
fprintf(stderr,"Internal Error: Asked to free a block already marked as free (block=%lu it=%d type=%lu). Please report this bug.\n",
(unsigned long)block,it,(unsigned long)mdp->heapinfo[block].type);
abort();
}
- mdp->heapinfo[block+it].type = -1;
+ mdp->heapinfo[block+it].type = MMALLOC_TYPE_FREE;
}
block = i;
} else {
- //fprintf(stderr,"Free block %d to %d (as a new chunck)\n",block,block+mdp->heapinfo[block].busy_block.size);
/* Really link this block back into the free list. */
mdp->heapinfo[block].free_block.size = mdp->heapinfo[block].busy_block.size;
mdp->heapinfo[block].free_block.next = mdp->heapinfo[i].free_block.next;
(unsigned long)block,it,(unsigned long)mdp->heapinfo[block].free_block.size,(unsigned long)mdp->heapinfo[block].type);
abort();
}
- mdp->heapinfo[block+it].type = -1;
+ mdp->heapinfo[block+it].type = MMALLOC_TYPE_FREE;
}
}
}
/* Now see if we can return stuff to the system. */
- /* blocks = mdp -> heapinfo[block].free.size;
+#if 0
+ blocks = mdp -> heapinfo[block].free.size;
if (blocks >= FINAL_FREE_BLOCKS && block + blocks == mdp -> heaplimit
&& mdp -> morecore (mdp, 0) == ADDRESS (block + blocks))
{
block = mdp -> heapinfo[block].free.prev;
mdp -> heapstats.chunks_free--;
mdp -> heapstats.bytes_free -= bytes;
- } */
+ }
+#endif
- /* Set the next search to begin at this block.
- This is probably important to the trick where realloc returns the block to
+ /* Set the next search to begin at this block.
+ This is probably important to the trick where realloc returns the block to
the system before reasking for the same block with a bigger size. */
mdp->heapindex = block;
break;
default:
+ if (type < 0) {
+ fprintf(stderr, "Unkown mmalloc block type.\n");
+ abort();
+ }
+
/* Do some of the statistics. */
mdp -> heapstats.chunks_used--;
mdp -> heapstats.bytes_used -= 1 << type;
THROWF(system_error, 0, "Asked to free a fragment that is already free. I'm puzzled\n");
}
- if(MC_is_active()){
- if(mdp->heapinfo[block].busy_frag.ignore[frag_nb] > 0)
- MC_remove_ignore_heap(ptr, mdp->heapinfo[block].busy_frag.frag_size[frag_nb]);
- }
+ if (MC_is_active() && mdp->heapinfo[block].busy_frag.ignore[frag_nb] > 0)
+ MC_unignore_heap(ptr, mdp->heapinfo[block].busy_frag.frag_size[frag_nb]);
/* Set size used in the fragment to -1 */
mdp->heapinfo[block].busy_frag.frag_size[frag_nb] = -1;
mdp->heapinfo[block].busy_frag.ignore[frag_nb] = 0;
-// fprintf(stderr,"nfree:%zu capa:%d\n", mdp->heapinfo[block].busy_frag.nfree,(BLOCKSIZE >> type));
if (mdp->heapinfo[block].busy_frag.nfree ==
(BLOCKSIZE >> type) - 1) {
/* If all fragments of this block are free, remove this block from its swag and free the whole block. */
xbt_swag_remove(&mdp->heapinfo[block],&mdp->fraghead[type]);
/* pretend that this block is used and free it so that it gets properly coalesced with adjacent free blocks */
- mdp->heapinfo[block].type = 0;
+ mdp->heapinfo[block].type = MMALLOC_TYPE_UNFRAGMENTED;
mdp->heapinfo[block].busy_block.size = 1;
mdp->heapinfo[block].busy_block.busy_size = 0;
-
+
/* Keep the statistics accurate. */
mdp -> heapstats.chunks_used++;
mdp -> heapstats.bytes_used += BLOCKSIZE;
mdp -> heapstats.chunks_free -= BLOCKSIZE >> type;
mdp -> heapstats.bytes_free -= BLOCKSIZE;
-
+
mfree((void *) mdp, (void *) ADDRESS(block));
} else if (mdp->heapinfo[block].busy_frag.nfree != 0) {
/* If some fragments of this block are free, you know what? I'm already happy. */
break;
}
}
-
