Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
This module provides a stable interface to access GHC's info provenance information. This is helpful for seeing metadata about heap objects.
Documentation
whereFrom :: a -> IO (Maybe InfoProv) #
Get information about where a value originated from. This information is stored statically in a binary when `-finfo-table-map` is enabled. The source positions will be greatly improved by also enabled debug information with `-g3`. Finally you can enable `-fdistinct-constructor-tables` to get more precise information about data constructor allocations.
The information is collect by looking at the info table address of a specific closure and then consulting a specially generated map (by `-finfo-table-map`) to find out where we think the best source position to describe that info table arose from.