mkpost.go

Documentation: syscall

     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  //go:build ignore
     6  // +build ignore
     7  
     8  // mkpost processes the output of cgo -godefs to
     9  // modify the generated types. It is used to clean up
    10  // the syscall API in an architecture specific manner.
    11  //
    12  // mkpost is run after cgo -godefs by mkall.sh.
    13  package main
    14  
    15  import (
    16  	"fmt"
    17  	"go/format"
    18  	"io"
    19  	"log"
    20  	"os"
    21  	"regexp"
    22  	"strings"
    23  )
    24  
    25  func main() {
    26  	b, err := io.ReadAll(os.Stdin)
    27  	if err != nil {
    28  		log.Fatal(err)
    29  	}
    30  	s := string(b)
    31  
    32  	goarch := os.Getenv("GOARCH")
    33  	goos := os.Getenv("GOOS")
    34  	switch {
    35  	case goarch == "s390x" && goos == "linux":
    36  		// Export the types of PtraceRegs fields.
    37  		re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
    38  		s = re.ReplaceAllString(s, "Ptrace$1")
    39  
    40  		// Replace padding fields inserted by cgo with blank identifiers.
    41  		re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
    42  		s = re.ReplaceAllString(s, "_")
    43  
    44  		// We want to keep X__val in Fsid. Hide it and restore it later.
    45  		s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
    46  
    47  		// Replace other unwanted fields with blank identifiers.
    48  		re = regexp.MustCompile("X_[A-Za-z0-9_]*")
    49  		s = re.ReplaceAllString(s, "_")
    50  
    51  		// Restore X__val in Fsid.
    52  		s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
    53  
    54  		// Force the type of RawSockaddr.Data to [14]int8 to match
    55  		// the existing gccgo API.
    56  		re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
    57  		s = re.ReplaceAllString(s, "${1}int8")
    58  
    59  	case goos == "freebsd":
    60  		// Keep pre-FreeBSD 10 / non-POSIX 2008 names for timespec fields
    61  		re := regexp.MustCompile("(A|M|C|Birth)tim\\s+Timespec")
    62  		s = re.ReplaceAllString(s, "${1}timespec Timespec")
    63  	}
    64  
    65  	// gofmt
    66  	b, err = format.Source([]byte(s))
    67  	if err != nil {
    68  		log.Fatal(err)
    69  	}
    70  
    71  	// Append this command to the header to show where the new file
    72  	// came from.
    73  	re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
    74  	s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
    75  
    76  	fmt.Print(s)
    77  }
    78
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