Function commit_graph_data_at

commit-graph.c:147–172

}

static struct commit_graph_data *commit_graph_data_at(const struct commit *c)
{
	unsigned int i, nth_slab;
	struct commit_graph_data *data =
		commit_graph_data_slab_peek(&commit_graph_data_slab, c);

	if (data)
		return data;

	nth_slab = c->index / commit_graph_data_slab.slab_size;
	data = commit_graph_data_slab_at(&commit_graph_data_slab, c);

	/*
	 * commit-slab initializes elements with zero, overwrite this with
	 * COMMIT_NOT_FROM_GRAPH for graph_pos.
	 *
	 * We avoid initializing generation with checking if graph position
	 * is not COMMIT_NOT_FROM_GRAPH.
	 */
	for (i = 0; i < commit_graph_data_slab.slab_size; i++) {
		commit_graph_data_slab.slab[nth_slab][i].graph_pos =
			COMMIT_NOT_FROM_GRAPH;
	}

	return data;
}

/*
 * Should be used only while writing commit-graph as it compares