File size: 3,913 Bytes
61bba11 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | // Copyright 2012 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.
package main
import (
"fmt"
"io"
"path/filepath"
"sort"
"strings"
)
/*
* Helpers for building cmd/go and cmd/cgo.
*/
// generatedHeader is the string that all source files generated by dist start with.
//
// DO NOT CHANGE THIS STRING. If this string is changed then during
//
// ./make.bash
// git checkout other-rev
// ./make.bash
//
// the second make.bash will not find the files generated by the first make.bash
// and will not clean up properly.
const generatedHeader = "// Code generated by go tool dist; DO NOT EDIT.\n\n"
// writeHeader emits the standard "generated by" header for all files generated
// by dist.
func writeHeader(w io.Writer) {
fmt.Fprint(w, generatedHeader)
}
// mkzdefaultcc writes zdefaultcc.go:
//
// package main
// const defaultCC = <defaultcc>
// const defaultCXX = <defaultcxx>
// const defaultPkgConfig = <defaultpkgconfig>
//
// It is invoked to write cmd/go/internal/cfg/zdefaultcc.go
// but we also write cmd/cgo/zdefaultcc.go
func mkzdefaultcc(dir, file string) {
if strings.Contains(file, filepath.FromSlash("go/internal/cfg")) {
var buf strings.Builder
writeHeader(&buf)
fmt.Fprintf(&buf, "package cfg\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "const DefaultPkgConfig = `%s`\n", defaultpkgconfig)
buf.WriteString(defaultCCFunc("DefaultCC", defaultcc))
buf.WriteString(defaultCCFunc("DefaultCXX", defaultcxx))
writefile(buf.String(), file, writeSkipSame)
return
}
var buf strings.Builder
writeHeader(&buf)
fmt.Fprintf(&buf, "package main\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "const defaultPkgConfig = `%s`\n", defaultpkgconfig)
buf.WriteString(defaultCCFunc("defaultCC", defaultcc))
buf.WriteString(defaultCCFunc("defaultCXX", defaultcxx))
writefile(buf.String(), file, writeSkipSame)
}
func defaultCCFunc(name string, defaultcc map[string]string) string {
var buf strings.Builder
fmt.Fprintf(&buf, "func %s(goos, goarch string) string {\n", name)
fmt.Fprintf(&buf, "\tswitch goos+`/`+goarch {\n")
var keys []string
for k := range defaultcc {
if k != "" {
keys = append(keys, k)
}
}
sort.Strings(keys)
for _, k := range keys {
fmt.Fprintf(&buf, "\tcase %s:\n\t\treturn %s\n", quote(k), quote(defaultcc[k]))
}
fmt.Fprintf(&buf, "\t}\n")
if cc := defaultcc[""]; cc != "" {
fmt.Fprintf(&buf, "\treturn %s\n", quote(cc))
} else {
clang, gcc := "clang", "gcc"
if strings.HasSuffix(name, "CXX") {
clang, gcc = "clang++", "g++"
}
fmt.Fprintf(&buf, "\tswitch goos {\n")
fmt.Fprintf(&buf, "\tcase ")
for i, os := range clangos {
if i > 0 {
fmt.Fprintf(&buf, ", ")
}
fmt.Fprintf(&buf, "%s", quote(os))
}
fmt.Fprintf(&buf, ":\n")
fmt.Fprintf(&buf, "\t\treturn %s\n", quote(clang))
fmt.Fprintf(&buf, "\t}\n")
fmt.Fprintf(&buf, "\treturn %s\n", quote(gcc))
}
fmt.Fprintf(&buf, "}\n")
return buf.String()
}
// mktzdata src/time/tzdata/zzipdata.go:
//
// package tzdata
// const zipdata = "PK..."
func mktzdata(dir, file string) {
zip := readfile(filepath.Join(dir, "../../../lib/time/zoneinfo.zip"))
var buf strings.Builder
writeHeader(&buf)
fmt.Fprintf(&buf, "package tzdata\n")
fmt.Fprintln(&buf)
fmt.Fprintf(&buf, "const zipdata = %s\n", quote(zip))
writefile(buf.String(), file, writeSkipSame)
}
// quote is like strconv.Quote but simpler and has output
// that does not depend on the exact Go bootstrap version.
func quote(s string) string {
const hex = "0123456789abcdef"
var out strings.Builder
out.WriteByte('"')
for i := 0; i < len(s); i++ {
c := s[i]
if 0x20 <= c && c <= 0x7E && c != '"' && c != '\\' {
out.WriteByte(c)
} else {
out.WriteByte('\\')
out.WriteByte('x')
out.WriteByte(hex[c>>4])
out.WriteByte(hex[c&0xf])
}
}
out.WriteByte('"')
return out.String()
}
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