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Add lbt_forwarded_funcs() to debug LBT forwarding issues #55302

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Jul 30, 2024
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Add lbt_forwarded_funcs() to debug LBT forwarding issues #55302

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19 changes: 19 additions & 0 deletions stdlib/LinearAlgebra/src/lbt.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,25 @@ function lbt_find_backing_library(symbol_name, interface::Symbol;
end


"""
lbt_forwarded_funcs(config::LBTConfig, lib::LBTLibraryInfo)

Given a backing library `lib`, return the list of all functions that are
forwarded to that library, as a vector of `String`s.
"""
function lbt_forwarded_funcs(config::LBTConfig, lib::LBTLibraryInfo)
forwarded_funcs = String[]
for (symbol_idx, symbol) in enumerate(config.exported_symbols)
forward_byte_offset = div(symbol_idx - 1, 8)
forward_byte_mask = 1 << mod(symbol_idx - 1, 8)
if lib.active_forwards[forward_byte_offset+1] & forward_byte_mask != 0x00
push!(forwarded_funcs, symbol)
end
end
return forwarded_funcs
end


## NOTE: Manually setting forwards is referred to as the 'footgun API'. It allows truly
## bizarre and complex setups to be created. If you run into strange errors while using
## it, the first thing you should ask yourself is whether you've set things up properly.
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