PyObject not automatically converted to Julia type in Debugger

[cuihantao]

Hi,

I'm looking to debug Julia code that uses NumPy through PyCall. It turns out that PyObjects are not automatically converted to Julia types when debugging with Debugger.

The same issue has been posted at JunoLab/Juno.jl#591.

To reproduce the issue, do the following in REPL

julia> using Debugger

julia> using PyCall

julia> function test()
       np = pyimport("numpy")
       a = np.zeros(3)
       b = Array(a)
       end
test (generic function with 1 method)

julia> @run test()
ERROR: MethodError: no method matching Array(::PyObject)
Closest candidates are:
  Array(::LinearAlgebra.SymTridiagonal) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.4/LinearAlgebra/src/tridiag.jl:111
  Array(::LinearAlgebra.Tridiagonal) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.4/LinearAlgebra/src/tridiag.jl:528
  Array(::LinearAlgebra.AbstractTriangular) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.4/LinearAlgebra/src/triangular.jl:162
  ...
Stacktrace:
 [1] test() at REPL[14]:4

julia> test()
3-element Array{Float64,1}:
 0.0
 0.0
 0.0

[timholy]

Reduced:

julia> using JuliaInterpreter, PyCall

julia> np = pyimport("numpy");

julia> @interpret pytype_query(np.zeros)
ERROR: TypeError: in cglobal, expected Symbol, got a value of type JuliaInterpreter.SSAValue
Stacktrace:
  [1] top-level scope
    @ none:1
  [2] eval
    @ ./boot.jl:360 [inlined]
  [3] maybe_evaluate_builtin(frame::Frame, call_expr::Expr, expand::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/builtins.jl:238
  [4] evaluate_call_recurse!(recurse::Any, frame::Frame, call_expr::Expr; enter_generated::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:204
  [5] evaluate_call_recurse!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:201 [inlined]
  [6] eval_rhs(recurse::Any, frame::Frame, node::Expr)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:394
  [7] step_expr!(recurse::Any, frame::Frame, node::Any, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:537
  [8] step_expr!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:587
  [9] finish!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:14
 [10] finish_and_return!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:29 [inlined]
 [11] evaluate_call_recurse!(recurse::Any, frame::Frame, call_expr::Expr; enter_generated::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:239
 [12] evaluate_call_recurse!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:201 [inlined]
 [13] eval_rhs(recurse::Any, frame::Frame, node::Expr)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:394
 [14] step_expr!(recurse::Any, frame::Frame, node::Any, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:450
 [15] step_expr!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:587
 [16] finish!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:14
 [17] finish_and_return!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:29 [inlined]
 [18] evaluate_call_recurse!(recurse::Any, frame::Frame, call_expr::Expr; enter_generated::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:239
 [19] evaluate_call_recurse!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:201 [inlined]
 [20] eval_rhs(recurse::Any, frame::Frame, node::Expr)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:394
 [21] step_expr!(recurse::Any, frame::Frame, node::Any, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:537
 [22] step_expr!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/interpret.jl:587
 [23] finish!(recurse::Any, frame::Frame, istoplevel::Bool)
    @ JuliaInterpreter ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:14
 [24] finish_and_return!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:29 [inlined]
 [25] finish_and_return!
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/commands.jl:33 [inlined]
 [26] top-level scope
    @ ~/.julia/packages/JuliaInterpreter/pJs87/src/construct.jl:774