.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/sys@v0.0.0-20210124154548-22da62e12c0c/cpu/byteorder.go

   1 // Copyright 2019 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package cpu
   6
   7 import (
   8         "runtime"
   9 )
  10
  11 // byteOrder is a subset of encoding/binary.ByteOrder.
  12 type byteOrder interface {
  13         Uint32([]byte) uint32
  14         Uint64([]byte) uint64
  15 }
  16
  17 type littleEndian struct{}
  18 type bigEndian struct{}
  19
  20 func (littleEndian) Uint32(b []byte) uint32 {
  21         _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
  22         return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
  23 }
  24
  25 func (littleEndian) Uint64(b []byte) uint64 {
  26         _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
  27         return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
  28                 uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
  29 }
  30
  31 func (bigEndian) Uint32(b []byte) uint32 {
  32         _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
  33         return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
  34 }
  35
  36 func (bigEndian) Uint64(b []byte) uint64 {
  37         _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
  38         return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
  39                 uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
  40 }
  41
  42 // hostByteOrder returns littleEndian on little-endian machines and
  43 // bigEndian on big-endian machines.
  44 func hostByteOrder() byteOrder {
  45         switch runtime.GOARCH {
  46         case "386", "amd64", "amd64p32",
  47                 "alpha",
  48                 "arm", "arm64",
  49                 "mipsle", "mips64le", "mips64p32le",
  50                 "nios2",
  51                 "ppc64le",
  52                 "riscv", "riscv64",
  53                 "sh":
  54                 return littleEndian{}
  55         case "armbe", "arm64be",
  56                 "m68k",
  57                 "mips", "mips64", "mips64p32",
  58                 "ppc", "ppc64",
  59                 "s390", "s390x",
  60                 "shbe",
  61                 "sparc", "sparc64":
  62                 return bigEndian{}
  63         }
  64         panic("unknown architecture")
  65 }