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py: Small cosmetic changes to gc_realloc.

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This commit is contained in:
Damien George 2014-03-06 00:02:16 +00:00
parent 7bf724da21
commit 73d579354b
1 changed files with 7 additions and 9 deletions
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16
py/gc.c
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@ -328,7 +328,7 @@ machine_uint_t gc_nbytes(void *ptr_in) {
void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
void *ptr_out = NULL;
machine_uint_t block =0;
machine_uint_t block = 0;
machine_uint_t ptr = (machine_uint_t)ptr_in;
if (ptr_in == NULL) {
@ -345,7 +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 */
do {
do {
block_type = ATB_GET_KIND(block + n_blocks + n_free);
switch (block_type) {
case AT_FREE: n_free++; break;
@ -361,11 +361,9 @@ void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
/* check if realloc'ing to a smaller size */
if (n_bytes <= n_existing) {
ptr_out = ptr_in;
/* TODO should free remaining tail blocks ? */
machine_uint_t last_block = block + n_blocks;
while (ATB_GET_KIND(last_block) == AT_TAIL) {
ATB_ANY_TO_FREE(last_block);
last_block++;
/* free unneeded tail blocks */
for (machine_uint_t bl = block + n_blocks; ATB_GET_KIND(bl) == AT_TAIL; bl++) {
ATB_ANY_TO_FREE(bl);
}
/* check if we can expand in place */
@ -378,14 +376,14 @@ void *gc_realloc(void *ptr_in, machine_uint_t n_bytes) {
n_existing/BYTES_PER_BLOCK, n_existing, n_existing/BYTES_PER_BLOCK+n_diff, n_existing + n_diff*BYTES_PER_BLOCK);
/* mark rest of blocks as used tail */
for (machine_uint_t bl = block+n_blocks; bl < (block+n_blocks+n_diff); bl++) {
for (machine_uint_t bl = block + n_blocks; bl < (block + n_blocks + n_diff); bl++) {
ATB_FREE_TO_TAIL(bl);
}
ptr_out = ptr_in;
/* try to find a new contiguous chain */
} else if ((ptr_out = gc_alloc(n_bytes)) != NULL) {
printf("gc_realloc: allocated new block \n");
DEBUG_printf("gc_realloc: allocated new block \n");
memcpy(ptr_out, ptr_in, n_existing);
gc_free(ptr_in);
}