codegen: fix generic input parameters

internal/codegen/codegen.go

@@ -978,10 +978,12 @@ func (g *generator) elementType(ctx *types.Context, e types.Element) (*genParamT
 			defaultValue:       g.elementDefaultValue(ctx, e),
 		}, nil
 	case types.ELEMENT_TYPE_VAR:
-		// A class variable type modifier
+		// Generic types are not fully supported yet,
+		// so we will just pass the raw unsafe.Pointer up to the user.
 		return &genParamType{
 			namespace:    "unsafe",
 			name:         "Pointer",
+			IsGeneric:    true,
 			IsPointer:    false,
 			IsPrimitive:  false,
 			IsArray:      false,

internal/codegen/templates.go

@@ -147,6 +147,7 @@ type genParamType struct {
 	name      string
 
 	IsPointer          bool
+	IsGeneric          bool
 	IsArray            bool
 	IsPrimitive        bool
 	IsEnum             bool

internal/codegen/templates/funcimpl.tmpl

@@ -63,6 +63,8 @@ hr, _, _ := syscall.SyscallN(
             {{else -}}
                 uintptr({{.GoVarName}}),   // in {{.GoTypeName}}
             {{end -}}
+        {{else if .Type.IsGeneric -}}
+            uintptr({{.GoVarName}}),   // in {{.GoTypeName}}
         {{else -}}
             uintptr(unsafe.Pointer(&{{.GoVarName}})),   // in {{.GoTypeName}}
         {{end -}}