Source file src/syscall/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	// +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		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$1")
    38	
    39			// Replace padding fields inserted by cgo with blank identifiers.
    40			re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
    41			s = re.ReplaceAllString(s, "_")
    42	
    43			// We want to keep X__val in Fsid. Hide it and restore it later.
    44			s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
    45	
    46			// Replace other unwanted fields with blank identifiers.
    47			re = regexp.MustCompile("X_[A-Za-z0-9_]*")
    48			s = re.ReplaceAllString(s, "_")
    49	
    50			// Restore X__val in Fsid.
    51			s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)
    52	
    53			// Force the type of RawSockaddr.Data to [14]int8 to match
    54			// the existing gccgo API.
    55			re = regexp.MustCompile("(Data\\s+\\[14\\])uint8")
    56			s = re.ReplaceAllString(s, "${1}int8")
    57	
    58		case goos == "freebsd":
    59			// Keep pre-FreeBSD 10 / non-POSIX 2008 names for timespec fields
    60			re := regexp.MustCompile("(A|M|C|Birth)tim\\s+Timespec")
    61			s = re.ReplaceAllString(s, "${1}timespec Timespec")
    62		}
    63	
    64		// gofmt
    65		b, err = format.Source([]byte(s))
    66		if err != nil {
    67			log.Fatal(err)
    68		}
    69	
    70		// Append this command to the header to show where the new file
    71		// came from.
    72		re := regexp.MustCompile("(cgo -godefs [a-zA-Z0-9_]+\\.go.*)")
    73		s = re.ReplaceAllString(string(b), "$1 | go run mkpost.go")
    74	
    75		fmt.Print(s)
    76	}
    77	

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