🍓 Support 32-bit systems

[terasakisatoshi]

• This PR allows Pluto to run 32bit system e.g. RaspberryPi devices. On such devices, the default type of numeric is regarded as Int32. Therefore if one defines function which accepts only Int64 (not Int), we will get MethodError: no method matching f(::Int32). Here is my log that shows what happens.

julia
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   _       _ _(_)_     |  Documentation: https://docs.julialang.org
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   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.5.3 (2020-11-09)
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|__/                   |

julia> versioninfo()
Julia Version 1.5.3
Commit 788b2c7* (2020-11-09 13:37 UTC)
Platform Info:
  OS: Linux (arm-linux-gnueabihf)
  CPU: ARMv7 Processor rev 3 (v7l)
  WORD_SIZE: 32
  LIBM: libopenlibm
  LLVM: libLLVM-9.0.1 (ORCJIT, cortex-a72)

julia> Sys.WORD_SIZE
32

julia> 1 |> typeof
Int32

julia> f(x::Int64) = 2x
f (generic function with 1 method)

julia> f(1)
ERROR: MethodError: no method matching f(::Int32)
Closest candidates are:
  f(::Int64) at REPL[4]:1
Stacktrace:
 [1] top-level scope at REPL[5]:1

julia> f(x::Int) = 2x
f (generic function with 2 methods)

julia> f(1)
2

If this PR is merged, Pluto.jl can support many devices 👍 . Below image is our future.

[pankgeorg]

Probably (but not even 50% sure, source) that's also needed for the webassembly build

[fonsp]

Can you share the error you get when you use Pluto without this fix?

[fonsp]

I'm sure that this PR will break the array view: try running zeros(100) and then click on "..." inside the array output

[terasakisatoshi]

EDIT: I've updated script

I'm sorry, when I try notebook regarding Plots.jl, it works. The real problem is when we using PyPlot.jl. Sorry for the confusion. Anyway

@fonsp Here is my error message: (Pluto v0.12.15)

Failed to show value:

MethodError: no method matching get_my_display_limit(::Array{Float64,1}, ::Int32, ::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}}, ::Int32, ::Int32)

Closest candidates are:

get_my_display_limit(::Any, !Matched::Int64, ::IOContext, !Matched::Int64, !Matched::Int64) at /home/pi/.julia/packages/Pluto/aJBx9/src/runner/PlutoRunner.jl:654

tree_data(::AbstractArray{var"#s10",1} where var"#s10", ::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}})@PlutoRunner.jl:667
show_richest(::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}}, ::Any)@PlutoRunner.jl:585
#sprint_withreturned#27(::IOContext{Base.DevNull}, ::Int32, ::typeof(Main.PlutoRunner.sprint_withreturned), ::Function, ::Array{Float64,1})@PlutoRunner.jl:544
#format_output_default#15(::Pair{Symbol,Dict{Tuple{UInt32,Int64},Int64}}, ::typeof(Main.PlutoRunner.format_output_default), ::Any)@PlutoRunner.jl:469
#format_output#16(::Pair{Symbol,Dict{Tuple{UInt32,Int64},Int64}}, ::typeof(Main.PlutoRunner.format_output), ::Array{Float64,1})@PlutoRunner.jl:486
formatted_result_of(::Base.UUID, ::Bool, ::Nothing)@PlutoRunner.jl:411
top-level scope@none:1

EDIT:

When we put ['H','E','l','l','o'] into cell, similar error occured

Failed to show value:

MethodError: no method matching get_my_display_limit(::Array{Char,1}, ::Int32, ::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}}, ::Int32, ::Int32)

Closest candidates are:

get_my_display_limit(::Any, !Matched::Int64, ::IOContext, !Matched::Int64, !Matched::Int64) at /home/pi/.julia/packages/Pluto/aJBx9/src/runner/PlutoRunner.jl:654

tree_data(::AbstractArray{var"#s10",1} where var"#s10", ::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}})@PlutoRunner.jl:667
show_richest(::IOContext{Base.GenericIOBuffer{Array{UInt8,1}}}, ::Any)@PlutoRunner.jl:585
#sprint_withreturned#27(::IOContext{Base.DevNull}, ::Int32, ::typeof(Main.PlutoRunner.sprint_withreturned), ::Function, ::Array{Char,1})@PlutoRunner.jl:544
#format_output_default#15(::Pair{Symbol,Dict{Tuple{UInt32,Int64},Int64}}, ::typeof(Main.PlutoRunner.format_output_default), ::Any)@PlutoRunner.jl:469
#format_output#16(::Pair{Symbol,Dict{Tuple{UInt32,Int64},Int64}}, ::typeof(Main.PlutoRunner.format_output), ::Array{Char,1})@PlutoRunner.jl:486
formatted_result_of(::Base.UUID, ::Bool, ::Nothing)@PlutoRunner.jl:411
top-level scope@none:1

[terasakisatoshi]

If this PR adopts, we will get this screenshot:

I'm sure that this PR will break the array view: try running zeros(100) and then click on "..." inside the array output

I've tried zero(100) and expand elements of the array by clicking "...".
Is this wrong ?

also

[fonsp]

Thanks! I managed to get a 32 bit version of Julia working so I can have a look at it myself :) It looks like there are still some small things to fix before all the tests pass, working on it now

[fonsp]

(FYI this is what I mean with Pluto's tests: image)

[terasakisatoshi]

thank you so much!