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Merge pull request #89 from SciML/getter
Add expression retrieval command
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‎Project.toml‎

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name = "RuntimeGeneratedFunctions"
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uuid = "7e49a35a-f44a-4d26-94aa-eba1b4ca6b47"
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authors = ["Chris Rackauckas <accounts@chrisrackauckas.com> and contributors"]
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version = "0.5.12"
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version = "0.5.13"
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[deps]
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ExprTools = "e2ba6199-217a-4e67-a87a-7c52f15ade04"

‎README.md‎

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f = g()
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@show f(1)
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```
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## Retrieving Expressions
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From a constructed RuntimeGeneratedFunction, you can retrieve the expressions using the
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`RuntimeGeneratedFunctions.get_expression` command. For example:
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```julia
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ex = :((x) -> x^2)
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rgf = @RuntimeGeneratedFunction(ex)
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julia> RuntimeGeneratedFunctions.get_expression(rgf)
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#=
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quote
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#= c:\Users\accou\OneDrive\Computer\Desktop\test.jl:39 =#
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x ^ 2
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end
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=#
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```
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This can be used to get the expression even if `drop_expr` has been performed.
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### Example: Retrieving Expressions from ModelingToolkit.jl
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[ModelingToolkit.jl](https://github.com/SciML/ModelingToolkit.jl) uses
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RuntimeGeneratedFunctions.jl for the construction of its functions to avoid issues of
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world-age. Take for example its tutorial:
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```julia
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using ModelingToolkit, RuntimeGeneratedFunctions
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using ModelingToolkit: t_nounits as t, D_nounits as D
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@mtkmodel FOL begin
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@parameters begin
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τ # parameters
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end
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@variables begin
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x(t) # dependent variables
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end
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@equations begin
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D(x) ~ (1 - x) / τ
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end
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end
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using DifferentialEquations: solve
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@mtkbuild fol = FOL()
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prob = ODEProblem(fol, [fol.x => 0.0], (0.0, 10.0), [fol.τ => 3.0])
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```
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If we check the function:
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```julia
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julia> prob.f
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(::ODEFunction{true, SciMLBase.AutoSpecialize, ModelingToolkit.var"#f#697"{RuntimeGeneratedFunction{(:ˍ₋arg1, :ˍ₋arg2, :t), ModelingToolkit.var"#_RGF_ModTag", ModelingToolkit.var"#_RGF_ModTag", (0x2cce5cf2, 0xd20b0d73, 0xd14ed8a6, 0xa4d56c4f, 0x72958ea1), Nothing}, RuntimeGeneratedFunction{(:ˍ₋out, :ˍ₋arg1, :ˍ₋arg2, :t), ModelingToolkit.var"#_RGF_ModTag", ModelingToolkit.var"#_RGF_ModTag", (0x7f3c227e, 0x8f116bb1, 0xb3528ad5, 0x9c57c605, 0x60f580c3), Nothing}}, UniformScaling{Bool}, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, ModelingToolkit.var"#852#generated_observed#706"{Bool, ODESystem, Dict{Any, Any}, Vector{Any}}, Nothing, ODESystem, Nothing, Nothing}) (generic function with 1 method)
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```
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It's a RuntimeGeneratedFunction. We can find the code for this system using the retrieval
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command on the function we want. For example, for the in-place function:
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```julia
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julia> RuntimeGeneratedFunctions.get_expression(prob.f.f.f_iip)
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:((ˍ₋out, ˍ₋arg1, ˍ₋arg2, t)->begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:373 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:374 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:375 =#
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begin
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begin
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begin
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#= C:\Users\accou\.julia\packages\Symbolics\HIg7O\src\build_function.jl:546 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:422 =# @inbounds begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:418 =#
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ˍ₋out[1] = (/)((+)(1, (*)(-1, ˍ₋arg1[1])), ˍ₋arg2[1])
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:420 =#
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nothing
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end
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end
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end
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end
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end)
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```
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or the out-of-place function:
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```julia
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julia> RuntimeGeneratedFunctions.get_expression(prob.f.f.f_oop)
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:((ˍ₋arg1, ˍ₋arg2, t)->begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:373 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:374 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:375 =#
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begin
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begin
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begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:468 =#
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(SymbolicUtils.Code.create_array)(typeof(ˍ₋arg1), nothing, Val{1}(), Val{(1,)}(), (/)((+)(1, (*)(-1, ˍ₋arg1[1])), ˍ₋arg2[1]))
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end
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end
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end
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end)
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```

‎docs/src/index.md‎

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@show f(1)
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```
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## Retrieving Expressions
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From a constructed RuntimeGeneratedFunction, you can retrieve the expressions using the
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`RuntimeGeneratedFunctions.get_expression` command. For example:
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```julia
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ex = :((x) -> x^2)
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rgf = @RuntimeGeneratedFunction(ex)
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julia> RuntimeGeneratedFunctions.get_expression(rgf)
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:((x,)->begin
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#= REPL[14]:1 =#
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x ^ 2
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end)
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```
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This can be used to get the expression even if `drop_expr` has been performed.
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### Example: Retrieving Expressions from ModelingToolkit.jl
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[ModelingToolkit.jl](https://github.com/SciML/ModelingToolkit.jl) uses
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RuntimeGeneratedFunctions.jl for the construction of its functions to avoid issues of
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world-age. Take for example its tutorial:
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```julia
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using ModelingToolkit, RuntimeGeneratedFunctions
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using ModelingToolkit: t_nounits as t, D_nounits as D
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@mtkmodel FOL begin
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@parameters begin
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τ # parameters
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end
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@variables begin
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x(t) # dependent variables
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end
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@equations begin
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D(x) ~ (1 - x) / τ
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end
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end
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using DifferentialEquations: solve
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@mtkbuild fol = FOL()
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prob = ODEProblem(fol, [fol.x => 0.0], (0.0, 10.0), [fol.τ => 3.0])
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```
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If we check the function:
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```julia
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julia> prob.f
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(::ODEFunction{true, SciMLBase.AutoSpecialize, ModelingToolkit.var"#f#697"{RuntimeGeneratedFunction{(:ˍ₋arg1, :ˍ₋arg2, :t), ModelingToolkit.var"#_RGF_ModTag", ModelingToolkit.var"#_RGF_ModTag", (0x2cce5cf2, 0xd20b0d73, 0xd14ed8a6, 0xa4d56c4f, 0x72958ea1), Nothing}, RuntimeGeneratedFunction{(:ˍ₋out, :ˍ₋arg1, :ˍ₋arg2, :t), ModelingToolkit.var"#_RGF_ModTag", ModelingToolkit.var"#_RGF_ModTag", (0x7f3c227e, 0x8f116bb1, 0xb3528ad5, 0x9c57c605, 0x60f580c3), Nothing}}, UniformScaling{Bool}, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, ModelingToolkit.var"#852#generated_observed#706"{Bool, ODESystem, Dict{Any, Any}, Vector{Any}}, Nothing, ODESystem, Nothing, Nothing}) (generic function with 1 method)
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```
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It's a RuntimeGeneratedFunction. We can find the code for this system using the retrieval
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command on the function we want. For example, for the in-place function:
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```julia
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julia> RuntimeGeneratedFunctions.get_expression(prob.f.f.f_iip)
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:((ˍ₋out, ˍ₋arg1, ˍ₋arg2, t)->begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:373 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:374 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:375 =#
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begin
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begin
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begin
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#= C:\Users\accou\.julia\packages\Symbolics\HIg7O\src\build_function.jl:546 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:422 =# @inbounds begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:418 =#
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ˍ₋out[1] = (/)((+)(1, (*)(-1, ˍ₋arg1[1])), ˍ₋arg2[1])
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:420 =#
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nothing
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end
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end
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end
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end
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end)
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```
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or the out-of-place function:
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```julia
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julia> RuntimeGeneratedFunctions.get_expression(prob.f.f.f_oop)
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:((ˍ₋arg1, ˍ₋arg2, t)->begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:373 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:374 =#
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:375 =#
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begin
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begin
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begin
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#= C:\Users\accou\.julia\packages\SymbolicUtils\c0xQb\src\code.jl:468 =#
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(SymbolicUtils.Code.create_array)(typeof(ˍ₋arg1), nothing, Val{1}(), Val{(1,)}(), (/)((+)(1, (*)(-1, ˍ₋arg1[1])), ˍ₋arg2[1]))
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end
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end
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end
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end)
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```
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## Reproducibility
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```@raw html

‎src/RuntimeGeneratedFunctions.jl‎

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return Expr(head, Any[closures_to_opaque(x, return_type) for x in args]...)
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end
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function get_expression(rgf::RuntimeGeneratedFunction{argnames, cache_tag,
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context_tag, id, B}) where {
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argnames,
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cache_tag,
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context_tag,
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id,
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B
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}
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func_expr = Expr(:->, Expr(:tuple, argnames...), _lookup_body(cache_tag, id))
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end
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# We write an explicit serialize() and deserialize() here to manage caching of
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# the body on a remote node when using Serialization.jl (in Distributed.jl
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# and elsewhere)

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