fix invalid code generation when type alias is fixed-array

README.md

@@ -26,7 +26,7 @@ Install on `Cargo.toml` as `build-dependencies` and set up `bindgen::Builder` on
 
 ```toml
 [build-dependencies]
-csbindgen = "1.5.0"
+csbindgen = "1.6.0"
 ```
 
 ### Rust to C#.

csbindgen-tests/src/lib.rs

@@ -73,6 +73,37 @@ mod lz4_ffi;
 //     println!("{}", str);
 // }
 
+#[allow(non_camel_case_types)]
+pub type png_byte = ::std::os::raw::c_uchar;
+
+#[allow(non_camel_case_types)]
+pub type JPH_ContactPoints = [u128; 65usize];
+#[allow(non_camel_case_types)]
+pub type JPH_ContactPoints2 = [u128; 65];
+
+#[repr(C)]
+#[allow(unused)]
+#[allow(non_snake_case)]
+pub struct JPH_ContactManifold {
+    pub mPenetrationDepth: f32,
+    pub mWorldSpaceContactPointsOn1: JPH_ContactPoints,
+    pub mWorldSpaceContactPointsOn2: JPH_ContactPoints,
+    pub mWorldSpaceContactPointsOn3: JPH_ContactPoints2,
+    pub mWorldSpaceContactPointsOn4: [u128; 65],
+    pub mWorldSpaceContactPointsOn5: [u32; 65],
+    pub png_name: [png_byte; 5usize],
+}
+
+#[no_mangle]
+#[allow(unused)]
+#[allow(non_snake_case)]
+pub extern "C" fn JPH_PruneContactPoints(
+    ioContactPointsOn1: *mut JPH_ContactPoints,
+    ioContactPointsOn2: *mut JPH_ContactManifold,
+)
+{
+    todo!();
+}
 
 
 /// my comment!

csbindgen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "csbindgen"
-version = "1.5.0"
+version = "1.6.0"
 edition = "2021"
 authors = [
   "Yoshifumi Kawai <ils@neue.cc>",

csbindgen/src/alias_map.rs

@@ -54,10 +54,6 @@ impl AliasMap {
             None => name.clone(),
         }
     }
-
-    pub fn iter(&self) -> std::collections::hash_map::Iter<String, RustType> {
-        self.type_aliases.iter()
-    }
 }
 
 #[cfg(test)]

csbindgen/src/emitter.rs

@@ -224,8 +224,16 @@ pub fn emit_csharp(
                 "".to_string()
             };
 
-            structs_string
-                .push_str(format!("        {}public {} {}", attr, type_name, escape_name(field.name.as_str())).as_str());
+            structs_string.push_str(
+                format!(
+                    "        {}public {} {}",
+                    attr,
+                    type_name,
+                    escape_name(field.name.as_str())
+                )
+                .as_str(),
+            );
+
             if let TypeKind::FixedArray(digits, _) = &field.rust_type.type_kind {
                 let mut digits = digits.clone();
                 if digits == "0" {
@@ -233,7 +241,23 @@ pub fn emit_csharp(
                 };
 
                 structs_string.push_str(format!("[{}]", digits).as_str());
+            } else {
+                let alias_resolved_field =
+                    match aliases.get_mapped_value(&field.rust_type.type_name) {
+                        Some(x) => x,
+                        None => field.rust_type.clone(),
+                    };
+
+                if let TypeKind::FixedArray(digits, _) = &alias_resolved_field.type_kind {
+                    let mut digits = digits.clone();
+                    if digits == "0" {
+                        digits = "1".to_string(); // 0 fixed array is not allowed in C#
+                    };
+
+                    structs_string.push_str(format!("[{}]", digits).as_str());
+                }
             }
+
             structs_string.push_str_ln(";");
         }
         structs_string.push_str_ln("    }");

csbindgen/src/type_meta.rs

@@ -257,17 +257,28 @@ impl RustType {
 
         match &self.type_kind {
             TypeKind::FixedArray(_, _) => {
-                sb.push_str("fixed ");
+                if emit_from_struct {
+                    sb.push_str("fixed ");
 
-                let type_name = type_csharp_string.as_str();
-                let type_name = match type_name {
+                    let type_name = type_csharp_string.as_str();
+                    let type_name = match type_name {
                     // C# fixed allow types
                     "bool" | "byte" | "short" | "int" | "long" | "char" | "sbyte" | "ushort"
                     | "uint" | "ulong" | "float" | "double" => type_name.to_owned(),
                     _ => format!("byte/* {}, this length is invalid so must keep pointer and can't edit from C# */", type_name)
                 };
 
-                sb.push_str(type_name.as_str());
+                    sb.push_str(type_name.as_str());
+                } else {
+                    let type_name = type_csharp_string.as_str();
+                    sb.push_str(
+                        format!(
+                            "void/* {}[] */",
+                            type_name
+                        )
+                        .as_str(),
+                    );
+                }
             }
             TypeKind::Function(parameters, return_type) => {
                 if emit_from_struct && !options.csharp_use_function_pointer {

dotnet-sandbox/NativeMethods.cs

@@ -12,6 +12,9 @@ namespace CsBindgen
     {
         const string __DllName = "csbindgen_tests";
 
+        [DllImport(__DllName, EntryPoint = "JPH_PruneContactPoints", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern void JPH_PruneContactPoints(void/* UInt128[] */* ioContactPointsOn1, JPH_ContactManifold* ioContactPointsOn2);
+
         /// <summary>my comment!</summary>
         [DllImport(__DllName, EntryPoint = "comment_one", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
         public static extern void comment_one();
@@ -141,6 +144,18 @@ namespace CsBindgen
 
     }
 
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe partial struct JPH_ContactManifold
+    {
+        public float mPenetrationDepth;
+        public fixed byte/* UInt128, this length is invalid so must keep pointer and can't edit from C# */ mWorldSpaceContactPointsOn1[65];
+        public fixed byte/* UInt128, this length is invalid so must keep pointer and can't edit from C# */ mWorldSpaceContactPointsOn2[65];
+        public fixed byte/* UInt128, this length is invalid so must keep pointer and can't edit from C# */ mWorldSpaceContactPointsOn3[65];
+        public fixed byte/* UInt128, this length is invalid so must keep pointer and can't edit from C# */ mWorldSpaceContactPointsOn4[65];
+        public fixed uint mWorldSpaceContactPointsOn5[65];
+        public fixed byte png_name[5];
+    }
+
     [StructLayout(LayoutKind.Sequential)]
     internal unsafe partial struct NfcCard
     {