Function link_by_path_match 

pub fn link_by_path_match(
    src_id: &FragmentId,
    ref_str: &str,
    idx: &FragmentIndex,
    edges: &mut EdgeDict,
    weight: f64,
    reverse_factor: f64,
)

Links src_id to fragments of files the reference plausibly names.

A match must be component-aligned: the reference equals the path, a full suffix of it, or a full prefix (a bazel package label names a directory). The previous contains accepted a match anywhere in the path, so a short generic reference — bazel deps and ansible roles are full of config, test, common — matched thousands of paths and linked every fragment of each, which is one of the two mechanisms behind envoy-class instances hanging the graph build (50% of dcbench).