Merge pull request #45 from yamachu/non-repr-attribute-struct-treat-as-empty-struct

Non repr attribute struct treat as unit struct

csbindgen-tests/src/lib.rs

@@ -606,6 +606,20 @@ pub struct CallbackTable {
     pub foobar: extern "C" fn(i: i32) -> i32,
 }
 
+pub struct InternalHiddenContext {
+    pub a: i32
+}
+
+pub struct TreatAsEmptyStruct {
+    internal: std::sync::Arc<InternalHiddenContext>
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn init_treat_as_empty_struct_context(_out: NonNull<Box<TreatAsEmptyStruct>>) {}
+
+#[no_mangle]
+pub unsafe extern "C" fn free_treat_as_empty_struct_context(_src: *mut TreatAsEmptyStruct) {}
+
 // fn run_physix(){
 //     unsafe {
 //         let foundation = physx_create_foundation();

csbindgen/src/parser.rs

@@ -170,6 +170,15 @@ pub fn collect_struct(ast: &syn::File, result: &mut Vec<RustStruct>) {
                 is_union: true,
             });
         } else if let Item::Struct(t) = item {
+            let mut repr = None;
+            for attr in &t.attrs {
+                let last_segment = attr.path.segments.last().unwrap();
+                if last_segment.ident == "repr" {
+                    repr = Some(attr.tokens.to_string());
+                }
+            }
+
+            if let Some(_) = repr {
                 if let syn::Fields::Named(f) = &t.fields {
                     let struct_name = t.ident.to_string();
                     let fields = collect_fields(f);
@@ -195,6 +204,16 @@ pub fn collect_struct(ast: &syn::File, result: &mut Vec<RustStruct>) {
                         is_union: false,
                     });
                 }
+            } else {
+                // non #[repr(?)] struct, treat as Unit struct
+                let struct_name = t.ident.to_string();
+                let fields: Vec<FieldMember> = Vec::new();
+                result.push(RustStruct {
+                    struct_name,
+                    fields,
+                    is_union: false,
+                });
+            }
         }
     }
 }

dotnet-sandbox/NativeMethods.cs

@@ -176,6 +176,12 @@ namespace CsBindgen
         [DllImport(__DllName, EntryPoint = "call_bindgen_lz4", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
         public static extern void call_bindgen_lz4();
 
+        [DllImport(__DllName, EntryPoint = "init_treat_as_empty_struct_context", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern void init_treat_as_empty_struct_context(TreatAsEmptyStruct** _out);
+
+        [DllImport(__DllName, EntryPoint = "free_treat_as_empty_struct_context", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern void free_treat_as_empty_struct_context(TreatAsEmptyStruct* _src);
+
 
     }
 
@@ -260,6 +266,11 @@ namespace CsBindgen
         public delegate* unmanaged[Cdecl]<int, int> foobar;
     }
 
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe partial struct TreatAsEmptyStruct
+    {
+    }
+
 
     [Flags]
     internal enum EnumFlags : uint