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Users are supposed to import GHC.Exts rather than GHC.Prim.
Part of #18749.
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Emit an Info Table Provenance Entry (IPE) for every stack represeted info table
if -finfo-table-map is turned on.
To decode a cloned stack, lookupIPE() is used. It provides a mapping between
info tables and their source location.
Please see these notes for details:
- [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)]
- [Mapping Info Tables to Source Positions]
Metric Increase:
T12545
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Add `StackSnapshot#` primitive type that represents a cloned stack (StgStack).
The cloning interface consists of two functions, that clone either the treads
own stack (cloneMyStack) or another threads stack (cloneThreadStack).
The stack snapshot is offline/cold, i.e. it isn't evaluated any further. This is
useful for analyses as it prevents concurrent modifications.
For technical details, please see Note [Stack Cloning].
Co-authored-by: Ben Gamari <bgamari.foss@gmail.com>
Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
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