github.com/tidwall/go@v0.0.0-20170415222209-6694a6888b7d/src/syscall/mkpost.go (about)

     1  // Copyright 2016 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  // +build ignore
     6  
     7  // mkpost processes the output of cgo -godefs to
     8  // modify the generated types. It is used to clean up
     9  // the syscall API in an architecture specific manner.
    10  //
    11  // mkpost is run after cgo -godefs by mkall.sh.
    12  package main
    13  
    14  import (
    15  	"fmt"
    16  	"go/format"
    17  	"io/ioutil"
    18  	"log"
    19  	"os"
    20  	"regexp"
    21  	"strings"
    22  )
    23  
    24  func main() {
    25  	b, err := ioutil.ReadAll(os.Stdin)
    26  	if err != nil {
    27  		log.Fatal(err)
    28  	}
    29  	s := string(b)
    30  
    31  	goarch := os.Getenv("GOARCH")
    32  	goos := os.Getenv("GOOS")
    33  	if goarch == "s390x" && goos == "linux" {
    34  		// Export the types of PtraceRegs fields.
    35  		re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
    36  		s = re.ReplaceAllString(s, "Ptrace$1")
    37  
    38  		// Replace padding fields inserted by cgo with blank identifiers.
    39  		re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
    40  		s = re.ReplaceAllString(s, "_")
    41  
    42  		// We want to keep X__val in Fsid. Hide it and restore it later.
    43  		s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
    44  
    45  		// Replace other unwanted fields with blank identifiers.
    46  		re = regexp.MustCompile("X_[A-Za-z0-9_]*")
    47  		s = re.ReplaceAllString(s, "_")
    48  
    49  		// Restore X__val in Fsid.
    50  		s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
    51  
    52  		// Force the type of RawSockaddr.Data to [14]int8 to match
    53  		// the existing gccgo API.
    54  		re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
    55  		s = re.ReplaceAllString(s, "${1}int8")
    56  	}
    57  
    58  	// gofmt
    59  	b, err = format.Source([]byte(s))
    60  	if err != nil {
    61  		log.Fatal(err)
    62  	}
    63  
    64  	// Append this command to the header to show where the new file
    65  	// came from.
    66  	re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
    67  	s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
    68  
    69  	fmt.Print(s)
    70  }