golang mkpost 代码
文件路径：/src/syscall/mkpost.go
/ Copyright 2016 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
/ mkpost processes the output of cgo -godefs to
/ modify the generated types. It is used to clean up
/ the syscall API in an architecture specific manner.
/
/ mkpost is run after cgo -godefs by mkall.sh.
package main
import (
"fmt"
"go/format"
"io"
"log"
"os"
"regexp"
"strings"
)
func main() {
b, err := io.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
s := string(b)
goarch := os.Getenv("GOARCH")
goos := os.Getenv("GOOS")
switch {
case goarch == "s390x" && goos == "linux":
/ Export the types of PtraceRegs fields.
re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
s = re.ReplaceAllString(s, "Ptrace$1")
/ Replace padding fields inserted by cgo with blank identifiers.
re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
s = re.ReplaceAllString(s, "_")
/ We want to keep X__val in Fsid. Hide it and restore it later.
s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
/ Replace other unwanted fields with blank identifiers.
re = regexp.MustCompile("X_[A-Za-z0-9_]*")
s = re.ReplaceAllString(s, "_")
/ Restore X__val in Fsid.
s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
/ Force the type of RawSockaddr.Data to [14]int8 to match
/ the existing gccgo API.
re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
s = re.ReplaceAllString(s, "${1}int8")
case goos == "freebsd":
/ Keep pre-FreeBSD 10 / non-POSIX 2008 names for timespec fields
re := regexp.MustCompile("(A|M|C|Birth)tim\\s+Timespec")
s = re.ReplaceAllString(s, "${1}timespec Timespec")
}
/ gofmt
b, err = format.Source([]byte(s))
if err != nil {
log.Fatal(err)
}
/ Append this command to the header to show where the new file
/ came from.
re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
fmt.Print(s)
}