...

src/compiler/Generation/QBE/QBEGenerator.cs

@@ -264,6 +264,56 @@ public static class QBEGenerator
                 throw new ArgumentOutOfRangeException(nameof(type));
         }
     }
+    
+    private static string EmitCopy(NubType type, string source)
+    {
+        var destination = VarName();
+        switch (type)
+        {
+            case NubArrayType nubArrayType:
+            {
+                var size = EmitArraySizeInBytes(nubArrayType, source);
+                _builder.AppendLine($"    {destination} =l alloc8 {size}");
+                EmitMemcpy(source, destination, size);
+                break;
+            }
+            case NubCStringType:
+            {
+                var size = EmitCStringSizeInBytes(source);
+                _builder.AppendLine($"    {destination} =l alloc8 {size}");
+                EmitMemcpy(source, destination, size);
+                break;
+            }
+            case NubStringType:
+            {
+                var size = EmitStringSizeInBytes(source);
+                _builder.AppendLine($"    {destination} =l alloc8 {size}");
+                EmitMemcpy(source, destination, size);
+                break;
+            }
+            case NubStructType nubStructType:
+            {
+                var size = SizeOf(nubStructType);
+                _builder.AppendLine($"    {destination} =l alloc8 {size}");
+                EmitMemcpy(source, destination, size.ToString());
+                break;
+            }
+            case NubPointerType:
+            case NubPrimitiveType:
+            {
+                _builder.AppendLine($"    {destination} {QBEAssign(type)} {source}");
+                break;
+            }
+            case NubVoidType:
+            case NubFuncType:
+            case NubAnyType:
+                throw new NotSupportedException($"Cannot copy type '{type}'");
+            default:
+                throw new ArgumentOutOfRangeException(nameof(type));
+        }
+        
+        return destination;
+    }
 
     private static string QBEAssign(NubType type)
     {
@@ -1248,6 +1298,7 @@ public static class QBEGenerator
         foreach (var parameter in funcCall.Parameters)
         {
             var result = EmitUnwrap(EmitExpression(parameter));
+            var copy = EmitCopy(parameter.Type, result);
 
             var qbeType = parameter.Type switch
             {
@@ -1274,7 +1325,8 @@ public static class QBEGenerator
                 NubStringType => "l",
                 _ => throw new NotSupportedException($"'{parameter.Type}' type cannot be used in function calls")
             };
-            parameterStrings.Add($"{qbeType} {result}");
+
+            parameterStrings.Add($"{qbeType} {copy}");
         }
 
         var funcPointer = EmitUnwrap(EmitExpression(funcCall.Expression));