Generate Julia wrappers with Clang.jl (#332)

* Generate Julia wrappers with Clang.jl

* Don't use the wrappers in this PR

* Apply suggestions from code review

Co-authored-by: Tangi Migot <tangi.migot@gmail.com>

---------

Co-authored-by: Tangi Migot <tangi.migot@gmail.com>

Author: amontoison

.gitignore

@@ -8,4 +8,7 @@ deps/*
 
 docs/build
 docs/site
-dos/Manifest.toml
+docs/Manifest.toml
+
+gen/Manifest.toml
+

gen/Project.toml

@@ -0,0 +1,8 @@
+[deps]
+Clang = "40e3b903-d033-50b4-a0cc-940c62c95e31"
+CUTEst_jll = "bb5f6f25-f23d-57fd-8f90-3ef7bad1d825"
+JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899"
+
+[compat]
+julia = "1.6"
+CUTEst_jll = "2.2.0"

gen/README.md

@@ -0,0 +1,9 @@
+# Wrapping headers
+
+This directory contains a script that can be used to automatically generate wrappers from C headers provided by CUTEst.
+This is done using Clang.jl.
+
+# Usage
+
+Either run `julia wrapper.jl` directly, or include it and call the `main()` function.
+Be sure to activate the project environment in this folder (`julia --project`), which will install `Clang.jl` and `JuliaFormatter.jl`.

gen/cutest.toml

@@ -0,0 +1,12 @@
+[general]
+use_julia_native_enum_type = true
+print_using_CEnum = false
+library_name = "cutest_lib_path"
+
+[codegen]
+use_julia_bool = true
+always_NUL_terminated_string = false
+use_ccall_macro = true
+
+[codegen.macro]
+macro_mode = "disable"

gen/wrapper.jl

@@ -0,0 +1,44 @@
+# Script to parse CUTEst headers and generate Julia wrappers.
+using CUTEst_jll
+using Clang
+using Clang.Generators
+using JuliaFormatter
+
+function main()
+
+  cd(@__DIR__)
+  include_dir = joinpath(CUTEst_jll.artifact_dir, "include")
+  headers = map(header -> joinpath(include_dir, header), ["cutest.h"])
+
+  options = load_options(joinpath(@__DIR__, "cutest.toml"))
+  options["general"]["output_file_path"] = joinpath("..", "src", "libcutest.jl")
+  options["general"]["output_ignorelist"] = ["integer", "real", "doublereal", "logical", "rp_", "rpc_", "ip_", "ipc_"]
+
+  args = get_default_args()
+  push!(args, "-I$include_dir")
+
+  ctx = create_context(headers, args, options)
+  build!(ctx)
+
+  path = options["general"]["output_file_path"]
+  code = read(path, String)
+  code = replace(code, "Ptr{integer}" => "Ptr{Cint}")
+  code = replace(code, "Ptr{doublereal}" => "Ptr{Float64}")
+  code = replace(code, "Ptr{real}" => "Ptr{Float32}")
+  code = replace(code, "Ptr{doubleCfloat}" => "Ptr{Float64}")
+  code = replace(code, "Ptr{logical}" => "Ptr{Bool}")
+  code = replace(code, "Ptr{rp_}" => "Ptr{Float64}")
+  code = replace(code, "Ptr{rpc_}" => "Ptr{Float64}")
+  code = replace(code, "Ptr{ip_}" => "Ptr{Cint}")
+  code = replace(code, "Ptr{ipc_}" => "Ptr{Cint}")
+  write(path, code)
+
+  format_file(path, YASStyle())
+
+  return nothing
+end
+
+# If we want to use the file as a script with `julia wrapper.jl`
+if abspath(PROGRAM_FILE) == @__FILE__
+  main()
+end

src/CUTEst.jl

@@ -13,6 +13,10 @@ using Libdl
 using NLPModels
 import Libdl.dlsym
 
+global cutest_lib_path = ""
+global cutest_lib = C_NULL
+include("libcutest.jl")
+
 # Only one problem can be interfaced at any given time.
 global cutest_instances = 0
 
@@ -64,7 +68,6 @@ end
 
 const cutest_problems_path = joinpath(dirname(@__FILE__), "..", "deps", "files")
 isdir(cutest_problems_path) || mkpath(cutest_problems_path)
-global cutest_lib = C_NULL
 
 function __init__()
   if success(`bash -c "type gfortran"`)
@@ -215,8 +218,8 @@ function sifdecoder(
       end
       run(`mv OUTSDIF.d $outsdif`)
       delete_temp_files(suffix)
-      global cutest_lib =
-        Libdl.dlopen(libname, Libdl.RTLD_NOW | Libdl.RTLD_DEEPBIND | Libdl.RTLD_GLOBAL)
+      global cutest_lib = Libdl.dlopen(libname, Libdl.RTLD_NOW | Libdl.RTLD_DEEPBIND | Libdl.RTLD_GLOBAL)
+      global cutest_lib_path = joinpath(cutest_problems_path, "$libname.$(Libdl.dlext)")
     end
   end
   rm(outlog)
@@ -298,7 +301,7 @@ function CUTEstModel(
       dlsym(cutest_lib, :fortran_open_),
       Nothing,
       (Ref{Int32}, Ptr{UInt8}, Ptr{Int32}),
-      funit,
+      [funit],
       outsdif,
       io_err,
     )