llvmio.jl is using incorrect declarations

[vtjnash]

It looks like many of the llvmcalls have incorrect definitions, atributes, types, ABIs, or other errors. These seem like they really should be using @ccall instead to let Julia handle those issues. I noticed this because it crashed in PkgEval with an LLVM verifier error.

[brenhinkeller]

Ah yeah, I think there's at least one more I still have wrong in there. As far as I understand @ccall is still not really StaticCompiler-able though, which is a must-have here.

If you have any pointers for which calls still have errors and what, that would be much appreciated -- but no worries if not; I know you have important things to do!

[brenhinkeller]

Oh, maybe @ccall does compile now, that would be nice!

julia> using StaticCompiler, StaticTools

julia> function hello()
           s = c"Hello, world!\n"
           p = pointer(s)
           GC.@preserve s @ccall printf(p::Ptr{UInt8})::Cint
       end
hello (generic function with 1 method)

julia> compile_executable(hello, (), "./")
"/Users/cbkeller/hello"

shell> ./hello
Hello, world!

[vtjnash]

A few I noticed specifically: incorrect attributes (e.g. nocapture on putc), incorrect ABI (printf is varargs, ftell may return either i64 or i64* depending on the platform ABI, fputc takes an int, it is usually illegal to pass i16 directly to vararg functions like fprintf, malloc takes an Int not Int64, similar issues for memset)

[brenhinkeller]

Thanks!

[brenhinkeller]

#34 may (?) be enough to fix the pkgeval failures for now, but I'll leave this open until I get a chance to try switching to @ccall