fast forward over nothing statements (#61)

* fast forward over nothing statements

* use maybe_next_call! instead

* Update Debugger.jl

Author: KristofferC

src/commands.jl

@@ -51,6 +51,7 @@ function execute_command(state::DebuggerState, ::Union{Val{:c},Val{:nc},Val{:n},
                 state.broke_on_error = true
             end
         end
+        JuliaInterpreter.maybe_next_call!(state.frame)
         return true
     end
 end

src/printing.jl

@@ -39,14 +39,8 @@ end
 
 function print_next_expr(io::IO, frame::Frame)
     maybe_quote(x) = (isa(x, Expr) || isa(x, Symbol)) ? QuoteNode(x) : x
-
-    pc = frame.pc
-    expr = pc_expr(frame, pc)
-    while expr === nothing
-        pc += 1
-        pc <= nstatements(frame.framecode) || return nothing
-        expr = pc_expr(frame, pc)
-    end
+    expr = pc_expr(frame)
+    @assert expr !== nothing
     print(io, "About to run: ")
     isa(expr, Expr) && (expr = copy(expr))
     if isexpr(expr, :(=))

test/misc.jl

@@ -44,7 +44,7 @@ execute_command(state, Val{:so}(), "c")
 @test state.overall_result == 2
 
 @inline fnothing(x) = 1
-frame = JuliaInterpreter.enter_call(fnothing, 0)
+frame = @make_frame fnothing(0)
 io = IOBuffer()
 Debugger.print_next_expr(io, frame)
 @test chomp(String(take!(io))) == "About to run: return 1"