compiler_stresstest.jl

module TortureTest

	# Scalability parameters - set here to roughly match the real world usecase
	# though that use case does more work.
	const NFIELDS = 888
	const NSET = 387
	const NREPS = 40

	using Random
	using Base.Meta

	struct Maybe{T}
		x::T
		is_missing::Bool
	end
	Base.convert(::Type{Maybe{T}}, x::Maybe{T}) where {T} = x
	Base.convert(::Type{Maybe{T}}, x::T) where {T} = Maybe{T}(x, true)
	Base.convert(::Type{Maybe{T}}, x) where {T} = Maybe{T}(convert(T, x), true)
	Base.eltype(::Type{Maybe{T}}) where {T} = T
	Maybe(x::T) where {T} = Maybe(x, false)

	@eval struct TestCase
		$([:($(Symbol("x$i"))::Maybe{$(rand(Bool) ? Float64 : Int64)}) for i = 1:NFIELDS]...)
	end

	@eval TestCase($(Expr(:parameters, [Expr(:kw, Symbol("x$i"), :(Maybe(convert(eltype(fieldtype(TestCase, $(quot(Symbol("x$i"))))), $(rand(Bool) ? Float64(i) : i))))) for i = 1:NFIELDS]...))) =
		TestCase($([Symbol("x$i") for i = 1:NFIELDS]...))

	@eval function run_test1(x)
		$([:(TestCase(;$([:($(Symbol("x$i")) = $(rand() < 0.05 ? (:x) : rand(Bool) ? Float64(i) : i)) for i = randperm(NFIELDS)[1:NSET]]...))) for _ = 1:NREPS]...)
	end

	@eval function run_test2(x)
		$([:(TestCase(;$([:($(Symbol("x$i")) = $(rand(Bool) ? Float64(i) : i)) for i = randperm(NFIELDS)[1:NSET]]...))) for _ = 1:NREPS]...)
	end

end
using Cthulhu

TortureTest.run_test1(1)