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
7package main
8
9import (
10	"bytes"
11	"fmt"
12	"log"
13	"os"
14	"strings"
15)
16
17var goarches []string
18
19func main() {
20	data, err := os.ReadFile("../../go/build/syslist.go")
21	if err != nil {
22		log.Fatal(err)
23	}
24	const goarchPrefix = `var knownArch = map[string]bool{`
25	inGOARCH := false
26	for _, line := range strings.Split(string(data), "\n") {
27		if strings.HasPrefix(line, goarchPrefix) {
28			inGOARCH = true
29		} else if inGOARCH && strings.HasPrefix(line, "}") {
30			break
31		} else if inGOARCH {
32			goarch := strings.Fields(line)[0]
33			goarch = strings.TrimPrefix(goarch, `"`)
34			goarch = strings.TrimSuffix(goarch, `":`)
35			goarches = append(goarches, goarch)
36		}
37	}
38
39	for _, target := range goarches {
40		if target == "amd64p32" {
41			continue
42		}
43		var buf bytes.Buffer
44		fmt.Fprintf(&buf, "// Code generated by gengoarch.go using 'go generate'. DO NOT EDIT.\n\n")
45		fmt.Fprintf(&buf, "//go:build %s\n\n", target) // must explicitly include target for bootstrapping purposes
46		fmt.Fprintf(&buf, "package goarch\n\n")
47		fmt.Fprintf(&buf, "const GOARCH = `%s`\n\n", target)
48		for _, goarch := range goarches {
49			value := 0
50			if goarch == target {
51				value = 1
52			}
53			fmt.Fprintf(&buf, "const Is%s = %d\n", strings.Title(goarch), value)
54		}
55		err := os.WriteFile("zgoarch_"+target+".go", buf.Bytes(), 0666)
56		if err != nil {
57			log.Fatal(err)
58		}
59	}
60}
61