| // Copyright 2023 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package abi |
| |
| import "unsafe" |
| |
| // The first word of every non-empty interface type contains an *ITab. |
| // It records the underlying concrete type (Type), the interface type it |
| // is implementing (Inter), and some ancillary information. |
| // |
| // allocated in non-garbage-collected memory |
| type ITab struct { |
| Inter *InterfaceType |
| Type *Type |
| Hash uint32 // copy of Type.Hash. Used for type switches. |
| Fun [1]uintptr // variable sized. fun[0]==0 means Type does not implement Inter. |
| } |
| |
| // EmptyInterface describes the layout of a "interface{}" or a "any." |
| // These are represented differently than non-empty interface, as the first |
| // word always points to an abi.Type. |
| type EmptyInterface struct { |
| Type *Type |
| Data unsafe.Pointer |
| } |
