blob: 79499b2955f633b50d6da71c1cc658168a71d5fd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// Copyright 2009 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 unsafe contains operations that step around the type safety of Go programs.
Packages that import unsafe may be non-portable and are not protected by the
Go 1 compatibility guidelines.
*/
package unsafe
// ArbitraryType is here for the purposes of documentation only and is not actually
// part of the unsafe package. It represents the type of an arbitrary Go expression.
type ArbitraryType int
// Pointer represents a pointer to an arbitrary type. There are four special operations
// available for type Pointer that are not available for other types.
// 1) A pointer value of any type can be converted to a Pointer.
// 2) A Pointer can be converted to a pointer value of any type.
// 3) A uintptr can be converted to a Pointer.
// 4) A Pointer can be converted to a uintptr.
// Pointer therefore allows a program to defeat the type system and read and write
// arbitrary memory. It should be used with extreme care.
type Pointer *ArbitraryType
// Sizeof returns the size in bytes occupied by the value v. The size is that of the
// "top level" of the value only. For instance, if v is a slice, it returns the size of
// the slice descriptor, not the size of the memory referenced by the slice.
func Sizeof(v ArbitraryType) uintptr
// Offsetof returns the offset within the struct of the field represented by v,
// which must be of the form structValue.field. In other words, it returns the
// number of bytes between the start of the struct and the start of the field.
func Offsetof(v ArbitraryType) uintptr
// Alignof returns the alignment of the value v. It is the maximum value m such
// that the address of a variable with the type of v will always be zero mod m.
// If v is of the form structValue.field, it returns the alignment of field f within struct object obj.
func Alignof(v ArbitraryType) uintptr
|
