GHC Debugger

Status: Work In Progress

We are working on a first class debugger for Haskell. It is still not ready for general consumption!

We will properly announce through the common channels the debugger when the first release is ready.

Usage

PATH="/path/to/head/ghc:$PATH" cabal install haskell-debugger-server

Then, install the VSCode extension haskell-debugger-extension that you can build with nix-build in the extension directory, dragging the result into the VSCode extensions tab, and you're set.

Features

Many not listed! Here are a few things:

Stepping

• Continue (resume execution forward)
• Next (step within local function)
• Step into (single step to next immediate tick)
• Step out (execute until end of function and break after the call)

In Reverse

• Local step backwards (ie reverse of Next)
• Single step backwards (ie reverse of Step into)
• Continue backwards (resume execution backwards until a breakpoint is hit)

Breakpoints

•  Module breakpoints
•  Function breakpoints
•  Exception breakpoints
• Data breakpoints
• Instruction breakpoints

Conditionals

• Conditional breakpoints (breakpoint is hit only if condition is satisfied)
• Hit conditional breakpoints (stop after N number of hits)