sys

Documentation

Overview

package sys contains system- and configuration- and architecture-specific constants used by the runtime.

Index

• Constants
• Variables
• func Bswap32(x uint32) uint32
• func Bswap64(x uint64) uint64
• func Ctz32(x uint32) int
• func Ctz64(x uint64) int
• type ArchFamilyType
• type Uintreg

Constants

const (
	ArchFamily          = AMD64
	BigEndian           = false
	CacheLineSize       = 64
	DefaultPhysPageSize = 4096
	PCQuantum           = 1
	Int64Align          = 8
	HugePageSize        = 1 << 21
	MinFrameSize        = 0
)

const GOARCH = `amd64`

const GOOS = `linux`

const Goarch386 = 0

const GoarchAmd64 = 1

const GoarchAmd64p32 = 0

const GoarchArm = 0

const GoarchArm64 = 0

const GoarchArm64be = 0

const GoarchArmbe = 0

const GoarchMips = 0

const GoarchMips64 = 0

const GoarchMips64le = 0

const GoarchMips64p32 = 0

const GoarchMips64p32le = 0

const GoarchMipsle = 0

const GoarchPpc = 0

const GoarchPpc64 = 0

const GoarchPpc64le = 0

const GoarchS390 = 0

const GoarchS390x = 0

const GoarchSparc = 0

const GoarchSparc64 = 0

const GoosAndroid = 0

const GoosDarwin = 0

const GoosDragonfly = 0

const GoosFreebsd = 0

const GoosLinux = 1

const GoosNacl = 0

const GoosNetbsd = 0

const GoosOpenbsd = 0

const GoosPlan9 = 0

const GoosSolaris = 0

const GoosWindows = 0

const GoosZos = 0

const PtrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const

PtrSize表示指针的size，也代表了cpu架构是32位还是64位。

const RegSize = 4 << (^Uintreg(0) >> 63) // unsafe.Sizeof(uintreg(0)) but an ideal const

Uintreg的size，不通平台不通大小，32bit为4，64bit为8

const SpAlign = 1*(1-GoarchArm64) + 16*GoarchArm64 // SP alignment: 1 normally, 16 for ARM64

Variables

var DefaultGoroot string // set at link time

Functions

func Bswap32

func Bswap32(x uint32) uint32

Bswap32 returns its input with byte order reversed 0x01020304 -> 0x04030201

func Bswap64

func Bswap64(x uint64) uint64

Bswap64 returns its input with byte order reversed 0x0102030405060708 -> 0x0807060504030201

func Ctz32

func Ctz32(x uint32) int

Ctz32 counts trailing (low-order) zeroes, and if all are zero, then 32.

func Ctz64

func Ctz64(x uint64) int

Ctz64 counts trailing (low-order) zeroes, and if all are zero, then 64.

Types

type ArchFamilyType

type ArchFamilyType int

const (
	AMD64 ArchFamilyType = iota
	ARM
	ARM64
	I386
	MIPS
	MIPS64
	PPC64
	S390X
)

type Uintreg

type Uintreg uint64