mkpost.go

     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  
     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"
    18  	"log"
    19  	"os"
    20  	"regexp"
    21  	"strings"
    22  )
    23  
    24  func main() {
    25  	b, err := io.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  	switch {
    34  	case goarch == "s390x" && goos == "linux":
    35  		// Export the types of PtraceRegs fields.
    36  		re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
    37  		s = re.ReplaceAllString(s, "Ptrace$1")
    38  
    39  		// Replace padding fields inserted by cgo with blank identifiers.
    40  		re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
    41  		s = re.ReplaceAllString(s, "_")
    42  
    43  		// We want to keep the X_ fields that are already consistently exported
    44  		// for the other linux GOARCH settings.
    45  		// Hide them and restore later.
    46  		s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
    47  		s = strings.Replace(s, "X__ifi_pad", "MKPOSTIFIPAD", 1)
    48  		s = strings.Replace(s, "X_f", "MKPOSTSYSINFOTF", 1)
    49  
    50  		// Replace other unwanted fields with blank identifiers.
    51  		re = regexp.MustCompile("X_[A-Za-z0-9_]*")
    52  		s = re.ReplaceAllString(s, "_")
    53  
    54  		// Restore preserved fields.
    55  		s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
    56  		s = strings.Replace(s, "MKPOSTIFIPAD", "X__ifi_pad", 1)
    57  		s = strings.Replace(s, "MKPOSTSYSINFOTF", "X_f", 1)
    58  
    59  		// Force the type of RawSockaddr.Data to [14]int8 to match
    60  		// the existing gccgo API.
    61  		re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
    62  		s = re.ReplaceAllString(s, "${1}int8")
    63  
    64  	case goos == "freebsd":
    65  		// Keep pre-FreeBSD 10 / non-POSIX 2008 names for timespec fields
    66  		re := regexp.MustCompile("(A|M|C|Birth)tim\\s+Timespec")
    67  		s = re.ReplaceAllString(s, "${1}timespec Timespec")
    68  	}
    69  
    70  	// gofmt
    71  	b, err = format.Source([]byte(s))
    72  	if err != nil {
    73  		log.Fatal(err)
    74  	}
    75  
    76  	// Append this command to the header to show where the new file
    77  	// came from.
    78  	re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
    79  	s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
    80  
    81  	fmt.Print(s)
    82  }
    83
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