gocyto

Gocyto

A Go SSA callgraph builder and visualizer, by @protolambda.

Features:

• output to generic Cytoscape JSON format. (list of nodes, list of edges)
• output to a single html file, with js dependencies in unpkg, and graph data embedded.
• outputs can be written to program output, or to a file.
• use different SSA analysis types
• support for Go-modules (powered by golang.org/x/tools/go/packages)
• graph data is nested: packages > types / globals > attached functions
• nodes are colored based on signature (50% parameters blend, 50% results blend%)
• all edges/nodes enhanced with classes to style/filter the graph with

go get github.com/protolambda/gocyto

Example output

This is the web output of the callgraph of Gocyto, including unexported functions:

Usage

Provide a Go package pattern to load the packages, and produce the call-graph.

gocyto github.com/user/project/some/package/...

options

gocyto [options...] <package path(s)>

Options:

  -build string
    	Build flags to pass to Go build tool. Separated with spaces
  -go-root
    	Include packages part of the Go root
  -mode string
    	Type of analysis to run. One of: pointer, cha, rta, static (default "pointer")
  -out string
    	Output file, if none is specified, output to std out
  -tests
    	Consider tests files as entry points for call-graph
  -unexported
    	Include unexported function calls
  -web
    	Output an index.html with graph data embedded instead of raw JSON

gocyto/analysis

To easily load packages into a SSA program, and construct callgraphs.

Loading packages:

program, err := analysis.RunAnalysis(withTests, buildFlags, packagePatterns)

Constructing a callgraph:

analysis.PointerAnalysis.ComputeCallgraph(program)

Supported callgraph analysis types:

• PointerAnalysis
• StaticAnalysis
• ClassHierarchyAnalysis
• RapidTypeAnalysis

gocyto/render

Loads call-graph into a Cyto-graph object. After loading your graph (or multiple), the data can be output to JSON to load with cytoscape.

Constructing a cyto graph:

// Base object, manages nodes, edges and keeps track of a [full-name -> ID] map for shorter IDs
cytoGraph := render.NewCytoGraph()

// more options to be decided on later, PRs welcome
opts := &render.RenderOptions{
    IncludeGoRoot: false,
    IncludeUnexported: false,
}

// add call graph from SSA analysis to cyto graph
err := cytoGraph.LoadCallGraph(callGraph, opts)

// add more call graphs if you like

Comparison

go-callvis

• Similar purpose
• bloated/hacky code
• uses deprecated SSA package loading
• no re-usable library code
• an ugly non-go Graphviz dependency
• no Go module support.
• limited styling
• hacky build-tags support (overwriting the default Go build flags during runtime...)

prospect

• minimal
• outdated, 4 years old
• limited callgraph information extracted
• looks like the origin of godoc callgraph tool (???)

callgraph

• digraph and graphviz output support
• doesn't add extra information (description/classes) to the calls
• supports same set of analysis algorithms

`godoc/analysis

• different visualization; go-doc complement, tree-view/code navigation
• Powers call-graph navigation

License

MIT License, see LICENSE file.