On Thu, Apr 7, 2016 at 12:59 PM, Laurent Bartholdi <[email protected]> wrote: > Thanks a lot! > There remains a weird issue about globals being mangled by the module name: > say that all my code is written in a module called "GAP". Assuming I put > this in the module: > > macro do_ccall(f,args...) :(ccall($f, Int, $(Expr(:tuple, [Int for i in > 1:length(args)]...)), $(args...))) end > > > julia> using GAP > > julia> x = GAP.Obj(0); > > julia> GAP.@do_ccall(x,1,2,3) > ERROR: UndefVarError: x not defined > > julia> macroexpand(:(GAP.@do_ccall(x,1,2,3))) > :(ccall(GAP.x,GAP.Int,(Int64,Int64,Int64),1,2,3)) > > Ahah... so x got treated as GAP.x. I tried then > > :(ccall($(esc(f)), Int, $(Expr(:tuple, [Int for i in 1:length(args)]...)), > $(args...))) > > and this works now; though if one of the arguments were also x the same > problems would occur. How should I make sure the code emitted contains > exactly the binding of its argument (x), and not something else (GAP.x)?
Correct, you need to escape all input... :(ccall($(esc(f)), Int, $(Expr(:tuple, [Int for i in 1:length(args)]...)), $([esc(arg) for arg in args]...)))
