On 11/07/14 01:09, Jeff King wrote:
> On Fri, Jul 11, 2014 at 12:58:31AM +0100, Ramsay Jones wrote:
>
>> #define DEFINE_ALLOCATOR(name, type) \
>> -static unsigned int name##_allocs; \
>> +static struct alloc_state name##_state; \
>> void *alloc_##name##_node(void) \
>> { \
>> - static int nr; \
>> - static type *block; \
>> - void *ret; \
>> - \
>> - if (!nr) { \
>> - nr = BLOCKING; \
>> - block = xmalloc(BLOCKING * sizeof(type)); \
>> - } \
>> - nr--; \
>> - name##_allocs++; \
>> - ret = block++; \
>> - memset(ret, 0, sizeof(type)); \
>> - return ret; \
>> + return alloc_node(&name##_state, sizeof(type)); \
>> }
>
> Yay. Not only does this solve the problem, but it gets rid of nasty
> multi-line macro. In fact, I kind of wonder if we should just do away
> with the macro entirely, and write out:
>
> static struct alloc_state blob_state;
> void alloc_blob_node(void)
> {
> return alloc_node(&blob_state, sizeof(struct blob));
> }
>
> It's more lines, but it is probably less obfuscated to a reader.
Yeah, I'm not a fan of _large_ multi-line macros myself.
Now that DEFINE_ALLOCATOR has slimmed down, I don't mind it so much.
However, I agree that doing away with the macro leads to easier to
read code. (I also don't mind the extra lines).
ATB,
Ramsay Jones
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