unsafe

package
Version: v0.0.0-...-ae31599 Latest Latest
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Published: Oct 8, 2015 License: BSD-3-Clause Imports: 0 Imported by: 0

Documentation

Overview

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.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Alignof

func Alignof(x ArbitraryType) uintptr

Alignof takes an expression x of any type and returns the alignment of a hypothetical variable v as if v was declared via var v = x. It is the largest value m such that the address of v is zero mod m.

func Offsetof

func Offsetof(x ArbitraryType) uintptr

Offsetof returns the offset within the struct of the field represented by x, 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 Sizeof

func Sizeof(x ArbitraryType) uintptr

Sizeof takes an expression x of any type and returns the size in bytes of a hypothetical variable v as if v was declared via var v = x. The size does not include any memory possibly referenced by x. For instance, if x is a slice, Sizeof returns the size of the slice descriptor, not the size of the memory referenced by the slice.

Types

type ArbitraryType

type ArbitraryType int

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 Pointer

type Pointer *ArbitraryType

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.

Source Files

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