Adapt to changes in bytecodealliance/wasmtime#6338, which changes the type of raw funcrefs/externrefs from usize to void*. (#247)

Therefore we change `nuint` to `IntPtr` for these types, which although technically equivalent, better matches the native API.

Author: kpreisser

src/Function.cs

@@ -724,10 +724,10 @@ internal static class Native
             public static extern IntPtr wasmtime_func_type(IntPtr context, in ExternFunc func);
 
             [DllImport(Engine.LibraryName)]
-            public static unsafe extern void wasmtime_func_from_raw(IntPtr context, nuint raw, out ExternFunc func);
+            public static unsafe extern void wasmtime_func_from_raw(IntPtr context, IntPtr raw, out ExternFunc func);
 
             [DllImport(Engine.LibraryName)]
-            public static unsafe extern nuint wasmtime_func_to_raw(IntPtr context, in ExternFunc func);
+            public static unsafe extern IntPtr wasmtime_func_to_raw(IntPtr context, in ExternFunc func);
 
             [DllImport(Engine.LibraryName)]
             public static extern IntPtr wasm_functype_new(in ValueTypeArray parameters, in ValueTypeArray results);

src/Value.cs

@@ -391,10 +391,10 @@ public static class Native
             public static extern void wasmtime_externref_delete(IntPtr externref);
 
             [DllImport(Engine.LibraryName)]
-            public static extern IntPtr wasmtime_externref_from_raw(IntPtr context, nuint raw);
+            public static extern IntPtr wasmtime_externref_from_raw(IntPtr context, IntPtr raw);
 
             [DllImport(Engine.LibraryName)]
-            public static extern nuint wasmtime_externref_to_raw(IntPtr context, IntPtr externref);
+            public static extern IntPtr wasmtime_externref_to_raw(IntPtr context, IntPtr externref);
         }
 
         public static readonly Native.Finalizer Finalizer = (p) => GCHandle.FromIntPtr(p).Free();

src/ValueRaw.cs

@@ -22,10 +22,10 @@ internal unsafe struct ValueRaw
         public V128 v128;
 
         [FieldOffset(0)]
-        public nuint funcref;
+        public IntPtr funcref;
 
         [FieldOffset(0)]
-        public nuint externref;
+        public IntPtr externref;
 
         public static IValueRawConverter<T> Converter<T>()
         {
@@ -196,7 +196,7 @@ public Function Unbox(StoreContext storeContext, Store store, in ValueRaw valueR
         {
             var funcref = default(ExternFunc);
 
-            if (valueRaw.funcref != 0)
+            if (valueRaw.funcref != IntPtr.Zero)
             {
                 Function.Native.wasmtime_func_from_raw(storeContext.handle, valueRaw.funcref, out funcref);
             }
@@ -206,7 +206,7 @@ public Function Unbox(StoreContext storeContext, Store store, in ValueRaw valueR
 
         public void Box(StoreContext storeContext, Store store, ref ValueRaw valueRaw, Function? value)
         {
-            nuint funcrefInt = 0;
+            IntPtr funcrefPtr = IntPtr.Zero;
 
             if (value?.IsNull is false)
             {
@@ -219,10 +219,10 @@ public void Box(StoreContext storeContext, Store store, ref ValueRaw valueRaw, F
                     throw new InvalidOperationException("Returning a Function is only allowed when it belongs to the current store.");
                 }
 
-                funcrefInt = Function.Native.wasmtime_func_to_raw(storeContext.handle, value.func);
+                funcrefPtr = Function.Native.wasmtime_func_to_raw(storeContext.handle, value.func);
             }
 
-            valueRaw.funcref = funcrefInt;
+            valueRaw.funcref = funcrefPtr;
         }
     }
 
@@ -238,7 +238,7 @@ private GenericValueRawConverter()
         {
             object? o = null;
 
-            if (valueRaw.externref != 0)
+            if (valueRaw.externref != IntPtr.Zero)
             {
                 // The externref is an owned value, so we must delete it afterwards.
                 var externref = Value.Native.wasmtime_externref_from_raw(storeContext.handle, valueRaw.externref);
@@ -262,7 +262,7 @@ private GenericValueRawConverter()
 
         public void Box(StoreContext storeContext, Store store, ref ValueRaw valueRaw, T value)
         {
-            nuint externrefInt = 0;
+            IntPtr externrefPtr = IntPtr.Zero;
 
             if (value is not null)
             {
@@ -276,7 +276,7 @@ public void Box(StoreContext storeContext, Store store, ref ValueRaw valueRaw, T
                     // Note: The externref data isn't tracked by wasmtime's GC until
                     // it enters WebAssembly, so Store.GC() mustn't be called between
                     // converting the value and passing it to WebAssembly.
-                    externrefInt = Value.Native.wasmtime_externref_to_raw(storeContext.handle, externref);
+                    externrefPtr = Value.Native.wasmtime_externref_to_raw(storeContext.handle, externref);
                 }
                 finally
                 {
@@ -286,7 +286,7 @@ public void Box(StoreContext storeContext, Store store, ref ValueRaw valueRaw, T
                 }
             }
 
-            valueRaw.externref = externrefInt;
+            valueRaw.externref = externrefPtr;
         }
     }
 }