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py: Add comments to new gc_realloc, it has some bugs.

This commit is contained in:
Damien George 2014-03-06 23:59:01 +00:00
parent 73d579354b
commit f08ddef676
1 changed files with 5 additions and 1 deletions
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6
py/gc.c
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@ -345,6 +345,7 @@ void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
/* get the number of consecutive tail blocks and
the number of free blocks after last tail block */
// XXX make sure we stop if we get to end of heap
do {
block_type = ATB_GET_KIND(block + n_blocks + n_free);
switch (block_type) {
@ -353,6 +354,7 @@ void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
default: break;
}
/* stop as soon as we find enough blocks for n_bytes */
// XXX check for n_bytes is wrong since we don't include n_free
} while (block_type != AT_HEAD && (n_bytes > (n_blocks * BYTES_PER_BLOCK)));
/* number of allocated bytes */
@ -367,8 +369,10 @@ void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
}
/* check if we can expand in place */
} else if (n_bytes <= (n_existing + (n_free * BYTES_PER_BLOCK))) {
// XXX disabled for now
} else if (0 && n_bytes <= (n_existing + (n_free * BYTES_PER_BLOCK))) {
/* number of blocks needed to expand +1 if there's a remainder */
// XXX this has a bug, but don't know why; try: l=[i for i in range(1000)]; for i in l: print(i/3)
machine_uint_t n_diff = ( n_bytes - n_existing)/BYTES_PER_BLOCK+
((n_bytes - n_existing)%BYTES_PER_BLOCK!=0);