JuliaDebug/Cthulhu.jl

Display of CFGs and DomTrees

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#26 opened on Feb 28, 2019

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enhancementgood first issuehelp wanted

Description

Would be fabolous to add some pretty printing for the CFG and dominator trees.

Keno apparently uses this snippet for DomTrees. We could use dot for the CFG like opt does it.

using AbstractTrees
using Core.Compiler: DomTree

AbstractTrees.treekind(d::DomTree) = AbstractTrees.IndexedTree()
AbstractTrees.childindices(d::DomTree, i::Int) = d[i].children
AbstractTrees.childindices(::DomTree, ::DomTree) = (1,)
AbstractTrees.parentlinks(::DomTree) = AbstractTrees.StoredParents()
AbstractTrees.printnode(io::IO, i::Int, d::DomTree) = print(io, i)
Base.getindex(d::DomTree, i) = d.nodes[i]
Base.show(io::IO, d::DomTree) = print_tree(io, 1; roottree = d)

Contributor guide

Tech stack
None
Domain
developer experiencetooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Julia language basicsCompiler CFG and DomTree conceptsAbstractTrees package usage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the Cthulhu.jl codebase to locate relevant files for displaying compiler information. Implement the provided snippet for DomTree pretty printing. For CFG, study how the Julia `opt` command uses `dot` and adapt it. Test with a simple function and ensure output is readable. No linked PRs or maintainer comments to reference.