Nim-gdb

GDB pretty printing for Nim language. Currently, this script requires Nim 0.17.2 or devel version of compiler installed manually from: https://github.com/nim-lang/Nim

Usage

Compile your nim project with nim c -d:debug --debugger:native your_project.nim command. Copy nim.py next to your project's executable you have just built. Start gdb debugging session with gdb your_project. In gdb command line run the following command to load debug helpers: python execfile("nim.py")

Python 3

If your gdb is linked against python3, use the 2to3 version like so: python exec(open("nim3.py").read())

Supported features:

• Type pretty printing, using whatis gdb command
• New gdb command $ for invoking Nim's $ stringify operator
• New function $dollar, does the same $ command but available in expressions
• Value pretty printing, including: enums, sets, seqs, strings, tuples and objects with discriminating unions

Known Limitations:

• Printing of enum values is using reprEnum function of Nim, you need to make that this function is not removed by dead code elimination. Add echo enumValue line to your code anywhere to make sure reprEnum is used.
• Printing of set values is using Nim's proc $[T](x: set[T]): string. Given it is generic proc, you need to to add echo for every set type in use to make it available in gdb.

These limitations are planned to be resolved in the future.