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Implement our own LookupError #2772

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88b4c54
Implement our own LookupError
vchuravy Nov 11, 2025
0cee171
fixup! Implement our own LookupError
vchuravy Nov 11, 2025
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8 changes: 5 additions & 3 deletions src/compiler.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,9 @@ import Enzyme:
allocatedinline,
ismutabletype,
create_fresh_codeinfo,
add_edge!
add_edge!,
LookupError

using Enzyme

import EnzymeCore
Expand Down Expand Up @@ -6270,7 +6272,7 @@ function thunk_generator(world::UInt, source::Union{Method, LineNumberNode}, @no

mi = my_methodinstance(Mode == API.DEM_ForwardMode ? Forward : Reverse, ft, primal_tt, world, min_world, max_world)

mi === nothing && return stub(world, source, :(throw(MethodError($ft, $primal_tt, $world))))
mi === nothing && return stub(world, source, :(throw(LookupError($ft, $primal_tt, $world))))

check_activity_cache_invalidations(world)

Expand Down Expand Up @@ -6389,7 +6391,7 @@ function deferred_id_generator(world::UInt, source::Union{Method, LineNumberNode

mi = my_methodinstance(Mode == API.DEM_ForwardMode ? Forward : Reverse, ft, primal_tt, world, min_world, max_world)

mi === nothing && return stub(world, source, :(throw(MethodError($ft, $primal_tt, $world))))
mi === nothing && return stub(world, source, :(throw(LookupError($ft, $primal_tt, $world))))

target = EnzymeTarget()
rt2 = if A isa UnionAll
Expand Down
2 changes: 1 addition & 1 deletion src/typeutils/inference.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,7 @@ function primal_return_type_generator(world::UInt, source, self, @nospecialize(m
slotnames,
Core.svec(),
)
mi === nothing && return stub(world, source, :(throw(MethodError(ft, tt, $world))))
mi === nothing && return stub(world, source, :(throw(LookupError(ft, tt, $world))))

result = primal_return_type_world(mode, world, mi)
code = Any[Core.Compiler.ReturnNode(result)]
Expand Down
22 changes: 19 additions & 3 deletions src/utils.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -264,6 +264,22 @@ end
end


struct LookupError <: Exception
ft::Type
tt::Type
world::UInt
end

function Base.showerror(io::IO, e::LookupError)
print(io, "no method matching ")
Base.show_signature_function(io, e.ft)
Base.show_tuple_as_call(io, :function, e.tt; hasfirst=false, kwargs=nothing)
if Core._hasmethod(GPUCompiler.signature_type_by_tt(e.ft, e.tt))
print(io, "\n(method exists but is not available in world age $(e.world))")
end
end


"""
create_fresh_codeinfo(fn, source, world)

Expand Down Expand Up @@ -378,9 +394,9 @@ function methodinstance_generator(world::UInt, source, self, @nospecialize(mode:
min_world = Ref{UInt}(typemin(UInt))
max_world = Ref{UInt}(typemax(UInt))
mi = my_methodinstance(mode.instance, ft, tt, world, min_world, max_world)
mi === nothing && return stub(world, source, :(throw(MethodError(ft, tt, $world))))

mi === nothing && return stub(world, source, :(throw(LookupError($ft, $tt, $world))))

code = Any[Core.Compiler.ReturnNode(mi)]

ci = create_fresh_codeinfo(prevmethodinstance, source, world, slotnames, code)
Expand Down
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