Decode decodes a serializable index of symbol reachability produced by Encode.

Encode analyzes the Go syntax trees of a package, constructs a reference graph, and uses it to compute, for each exported declaration, the set of exported symbols of directly imported packages that it references, perhaps indirectly.

NewPackageIndex creates a new PackageIndex instance for use in building reference and package sets.

A Class is a reachability equivalence class.

PackageIndex stores common data to enable efficient representation of references and package sets.

A PackageSet is a set of metadata.PackageIDs, optimized for inuse memory footprint and efficient union operations.

A Symbol represents an external (imported) symbol referenced by the analyzed package.

An IndexID is a small integer that uniquely identifies a package within a given PackageIndex.