Re: [PATCH v7 4/5] perf metric: Add utilities to work on ids map.

[Jiri Olsa]

On Tue, Jan 12, 2021 at 03:04:33PM -0800, Ian Rogers wrote:

SNIP

>  
> +struct hashmap *ids__union(struct hashmap *ids1, struct hashmap *ids2)
> +{
> +	size_t bkt;
> +	struct hashmap_entry *cur;
> +	int ret;
> +	struct expr_id_data *old_data = NULL;
> +	char *old_key = NULL;
> +
> +	if (!ids1)
> +		return ids2;
> +
> +	if (!ids2)
> +		return ids1;
> +
> +	if (hashmap__size(ids1) <  hashmap__size(ids2)) {
> +		struct hashmap *tmp = ids1;
> +
> +		ids1 = ids2;
> +		ids2 = tmp;
> +	}
> +	hashmap__for_each_entry(ids2, cur, bkt) {
> +		ret = hashmap__set(ids1, cur->key, cur->value,
> +				(const void **)&old_key, (void **)&old_data);
> +		free(old_key);
> +		free(old_data);
> +
> +		if (ret)
> +			break;

should this return NULL instead?

> +	}
> +	hashmap__free(ids2);
> +	return ids1;
> +}
> +

SNIP