github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/runtime/internal/sys/gengoos.go (about)

     1  // Copyright 2014 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  //go:build ignore
     6  // +build ignore
     7  
     8  package main
     9  
    10  import (
    11  	"bytes"
    12  	"fmt"
    13  	"log"
    14  	"os"
    15  	"strconv"
    16  	"strings"
    17  )
    18  
    19  var gooses, goarches []string
    20  
    21  func main() {
    22  	data, err := os.ReadFile("../../../go/build/syslist.go")
    23  	if err != nil {
    24  		log.Fatal(err)
    25  	}
    26  	const (
    27  		goosPrefix   = `const goosList = `
    28  		goarchPrefix = `const goarchList = `
    29  	)
    30  	for _, line := range strings.Split(string(data), "\n") {
    31  		if strings.HasPrefix(line, goosPrefix) {
    32  			text, err := strconv.Unquote(strings.TrimPrefix(line, goosPrefix))
    33  			if err != nil {
    34  				log.Fatalf("parsing goosList: %v", err)
    35  			}
    36  			gooses = strings.Fields(text)
    37  		}
    38  		if strings.HasPrefix(line, goarchPrefix) {
    39  			text, err := strconv.Unquote(strings.TrimPrefix(line, goarchPrefix))
    40  			if err != nil {
    41  				log.Fatalf("parsing goarchList: %v", err)
    42  			}
    43  			goarches = strings.Fields(text)
    44  		}
    45  	}
    46  
    47  	for _, target := range gooses {
    48  		if target == "nacl" {
    49  			continue
    50  		}
    51  		var tags []string
    52  		if target == "linux" {
    53  			tags = append(tags, "!android") // must explicitly exclude android for linux
    54  		}
    55  		if target == "solaris" {
    56  			tags = append(tags, "!illumos") // must explicitly exclude illumos for solaris
    57  		}
    58  		if target == "darwin" {
    59  			tags = append(tags, "!ios") // must explicitly exclude ios for darwin
    60  		}
    61  		tags = append(tags, target) // must explicitly include target for bootstrapping purposes
    62  		var buf bytes.Buffer
    63  		fmt.Fprintf(&buf, "// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.\n\n")
    64  		fmt.Fprintf(&buf, "//go:build %s\n", strings.Join(tags, " && "))
    65  		fmt.Fprintf(&buf, "// +build %s\n\n", strings.Join(tags, ","))
    66  		fmt.Fprintf(&buf, "package sys\n\n")
    67  		fmt.Fprintf(&buf, "const GOOS = `%s`\n\n", target)
    68  		for _, goos := range gooses {
    69  			value := 0
    70  			if goos == target {
    71  				value = 1
    72  			}
    73  			fmt.Fprintf(&buf, "const Goos%s = %d\n", strings.Title(goos), value)
    74  		}
    75  		err := os.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666)
    76  		if err != nil {
    77  			log.Fatal(err)
    78  		}
    79  	}
    80  
    81  	for _, target := range goarches {
    82  		if target == "amd64p32" {
    83  			continue
    84  		}
    85  		var buf bytes.Buffer
    86  		fmt.Fprintf(&buf, "// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.\n\n")
    87  		fmt.Fprintf(&buf, "//go:build %s\n", target)
    88  		fmt.Fprintf(&buf, "// +build %s\n\n", target) // must explicitly include target for bootstrapping purposes
    89  		fmt.Fprintf(&buf, "package sys\n\n")
    90  		fmt.Fprintf(&buf, "const GOARCH = `%s`\n\n", target)
    91  		for _, goarch := range goarches {
    92  			value := 0
    93  			if goarch == target {
    94  				value = 1
    95  			}
    96  			fmt.Fprintf(&buf, "const Goarch%s = %d\n", strings.Title(goarch), value)
    97  		}
    98  		err := os.WriteFile("zgoarch_"+target+".go", buf.Bytes(), 0666)
    99  		if err != nil {
   100  			log.Fatal(err)
   101  		}
   102  	}
   103  }