If you are trying to pass a struct by-value then it is unlikely to work. Julia does not support this at the abi level as yet. I think there is an open issue about this, and an old PR.
For more readable code_llvm output, try setting 'f(args) = ccall(...)' and look at code_llvm for f. Another way to see the details is to use a debugger and set a breakpoint in the function you are calling. On Jan 8, 2015 4:29 AM, "Andreas Lobinger" <[email protected]> wrote: > Hello colleagues, > > i thought i understood the ccall interface but now i ran into a problem > (segmentation fault) and i cannot really track down, where actually the > problem occures. > I want/need to pass a pointer to structure (c style) to a library and the > function in the library writes entries in the structure. > > (the following i write from memory, i do not have the code on this > computer...) > > type mytype > a::Int32 > b::Int32 > end > > t = mytype(0,0) > > ccall(:flip, Void, (mytype,), t) > > > 1) is there somewhere code you would recommend to read? > 2) how can i use code_lowered or code_llvm to actually see the details. > The above example is included in a module and it looks like the code is > compiled at 'using' so code_llvm e.g. only shows the call to the compiled > function, but not the inside. > 3) other documentation (blog, FR) etc? > > Wishing a happy day, > Andreas >
