File size: 2,967 Bytes
d7a5f2f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | // Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// This is based on the implementation of src/cmd/internal/obj/stringer.go.
// This is a mini version of the stringer tool customized for the Cnames
// table in the architecture support for obj.
package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"regexp"
"strings"
)
var (
input = flag.String("i", "", "input file name")
output = flag.String("o", "", "output file name")
pkg = flag.String("p", "", "package name")
)
var cnameExp = regexp.MustCompile(`^\tC_([A-Za-z0-9_]+)`)
func main() {
flag.Parse()
if *input == "" || *output == "" || *pkg == "" {
flag.Usage()
os.Exit(2)
}
start := ""
switch *pkg {
case "arm64":
start = "var cnames7 = []string{\n\t\"\", // C_NONE starts from 1\n"
case "loong64", "mips":
start = "var cnames0 = []string{\n"
case "ppc64":
start = "var cnames9 = []string{\n"
case "s390x":
start = "var cnamesz = []string{\n"
default:
fmt.Printf("Only supports generating Cnames for arm64,loong64,mips,ppc64,s390x.")
os.Exit(0)
}
in, err := os.Open(*input)
if err != nil {
log.Fatal(err)
}
fd, err := os.Create(*output)
if err != nil {
log.Fatal(err)
}
out := bufio.NewWriter(fd)
closeOut := func() {
if err = out.Flush(); err != nil {
log.Fatal(err)
}
if err = fd.Close(); err != nil {
log.Fatal(err)
}
}
defer closeOut()
on := false
s := bufio.NewScanner(in)
for s.Scan() {
line := s.Text()
if !on {
// First relevant line contains "C_NONE = iota".
// If we find it, delete the "=" so we don't stop immediately.
const first = "C_NONE"
if !strings.Contains(line, first) {
continue
}
const suffix = "= iota"
index := strings.Index(line, suffix)
if index < 0 {
continue
}
line = line[:index]
// It's on. Start with the header.
fmt.Fprintf(out, header, *input, *output, *pkg, *pkg)
fmt.Fprintf(out, start)
on = true
}
// Strip comments so their text won't defeat our heuristic.
index := strings.Index(line, "//")
if index > 0 {
line = line[:index]
}
index = strings.Index(line, "/*")
if index > 0 {
comments := line[index:]
if !strings.Contains(comments, "*/") {
log.Fatalf("invalid comment: %s\n", comments)
}
line = line[:index]
}
// Termination condition: Any line with an = changes the sequence,
// so stop there, and stop at a closing brace.
if strings.HasPrefix(line, "}") || strings.ContainsRune(line, '=') {
break
}
sub := cnameExp.FindStringSubmatch(line)
if len(sub) < 2 {
continue
} else {
fmt.Fprintf(out, "\t%q,\n", sub[1])
}
}
fmt.Fprintln(out, "}")
if s.Err() != nil {
log.Fatal(err)
}
}
const header = `// Code generated by mkcnames -i %s -o %s -p %s; DO NOT EDIT.
package %s
// This order should be strictly consistent to that in a.out.go.
`
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