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Commit a5c9d58d authored by Visweswara R's avatar Visweswara R Committed by Tobias Klauser
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unix/linux: replace "mksysnum.pl" script with a Go program 

Port mksysnum.pl Perl script to mksysnum.go.
mkall scripts are modified to run mksysnum.go.
Running ./mkall.sh does not generate any git diff besides
the command name in comments of generated files.

Updates golang/go#27779

Change-Id: Id62df9d819f00729ab19b6bc4d32dddcf8d9832b
Reviewed-on: https://go-review.googlesource.com/c/151377
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: 's avatarTobias Klauser <tobias.klauser@gmail.com>
parent 4ed8d59d
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Showing with 160 additions and 98 deletions
unix/linux/mkall.go
View file @ a5c9d58d
......@@ -222,6 +222,10 @@ func (t *target) commandFormatOutput(formatter string, outputFile string,
args = append([]string{"run", "mksyscall.go"}, args...)
mainCmd = makeCommand("go", args...)
t.setTargetBuildArch(mainCmd)
} else if name == "mksysnum" {
args = append([]string{"run", "linux/mksysnum.go"}, args...)
mainCmd = makeCommand("go", args...)
t.setTargetBuildArch(mainCmd)
}
fmtCmd := makeCommand(formatter)
......@@ -467,7 +471,7 @@ func (t *target) makeZSysnumFile() error {
unistdFile := filepath.Join(IncludeDir, "asm/unistd.h")
args := append(t.cFlags(), unistdFile)
return t.commandFormatOutput("gofmt", zsysnumFile, "linux/mksysnum.pl", args...)
return t.commandFormatOutput("gofmt", zsysnumFile, "mksysnum", args...)
}
// makes the zsyscall_linux_$GOARCH.go file
......
unix/linux/mksysnum.go 0 → 100755
View file @ a5c9d58d
// Copyright 2018 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.
// +build ignore
package main
import (
"bufio"
"fmt"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
)
var (
goos, goarch string
)
// cmdLine returns this programs's commandline arguments
func cmdLine() string {
return "go run linux/mksysnum.go " + strings.Join(os.Args[1:], " ")
}
// buildTags returns build tags
func buildTags() string {
return fmt.Sprintf("%s,%s", goarch, goos)
}
func format(name string, num int, offset int) string {
if num > 999 {
// ignore deprecated syscalls that are no longer implemented
// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
return ""
}
name = strings.ToUpper(name)
num = num + offset
return fmt.Sprintf(" SYS_%s = %d;\n", name, num)
}
func checkErr(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
}
// source string and substring slice for regexp
type re struct {
str string // source string
sub []string // matched sub-string
}
// Match performs regular expression match
func (r *re) Match(exp string) bool {
r.sub = regexp.MustCompile(exp).FindStringSubmatch(r.str)
if r.sub != nil {
return true
}
return false
}
func main() {
// Get the OS and architecture (using GOARCH_TARGET if it exists)
goos = os.Getenv("GOOS")
goarch = os.Getenv("GOARCH_TARGET")
if goarch == "" {
goarch = os.Getenv("GOARCH")
}
// Check if GOOS and GOARCH environment variables are defined
if goarch == "" || goos == "" {
fmt.Fprintf(os.Stderr, "GOARCH or GOOS not defined in environment\n")
os.Exit(1)
}
// Check that we are using the new build system if we should
if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
fmt.Fprintf(os.Stderr, "In the new build system, mksysnum should not be called directly.\n")
fmt.Fprintf(os.Stderr, "See README.md\n")
os.Exit(1)
}
cc := os.Getenv("CC")
if cc == "" {
fmt.Fprintf(os.Stderr, "CC is not defined in environment\n")
os.Exit(1)
}
args := os.Args[1:]
args = append([]string{"-E", "-dD"}, args...)
cmd, err := exec.Command(cc, args...).Output() // execute command and capture output
if err != nil {
fmt.Fprintf(os.Stderr, "can't run %s", cc)
os.Exit(1)
}
text := ""
s := bufio.NewScanner(strings.NewReader(string(cmd)))
var offset, prev int
for s.Scan() {
t := re{str: s.Text()}
if t.Match(`^#define __NR_Linux\s+([0-9]+)`) {
// mips/mips64: extract offset
offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
} else if t.Match(`^#define __NR(\w*)_SYSCALL_BASE\s+([0-9]+)`) {
// arm: extract offset
offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
} else if t.Match(`^#define __NR_syscalls\s+`) {
// ignore redefinitions of __NR_syscalls
} else if t.Match(`^#define __NR_(\w*)Linux_syscalls\s+`) {
// mips/mips64: ignore definitions about the number of syscalls
} else if t.Match(`^#define __NR_(\w+)\s+([0-9]+)`) {
prev, err = strconv.Atoi(t.sub[2])
checkErr(err)
text += format(t.sub[1], prev, offset)
} else if t.Match(`^#define __NR3264_(\w+)\s+([0-9]+)`) {
prev, err = strconv.Atoi(t.sub[2])
checkErr(err)
text += format(t.sub[1], prev, offset)
} else if t.Match(`^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)`) {
r2, err := strconv.Atoi(t.sub[2])
checkErr(err)
text += format(t.sub[1], prev+r2, offset)
} else if t.Match(`^#define __NR_(\w+)\s+\(__NR_(?:SYSCALL_BASE|Linux) \+ ([0-9]+)`) {
r2, err := strconv.Atoi(t.sub[2])
checkErr(err)
text += format(t.sub[1], r2, offset)
}
}
err = s.Err()
checkErr(err)
fmt.Printf(template, cmdLine(), buildTags(), text)
}
const template = `// %s
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build %s
package unix
const(
%s)`
unix/linux/mksysnum.pl deleted 100755 → 0
View file @ 4ed8d59d
#!/usr/bin/env perl
# Copyright 2009 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.
use strict;
if($ENV{'GOARCH'} eq "" || $ENV{'GOOS'} eq "") {
print STDERR "GOARCH or GOOS not defined in environment\n";
exit 1;
}
# Check that we are using the new build system if we should
if($ENV{'GOLANG_SYS_BUILD'} ne "docker") {
print STDERR "In the new build system, mksysnum should not be called directly.\n";
print STDERR "See README.md\n";
exit 1;
}
my $command = "$0 ". join(' ', @ARGV);
print <<EOF;
// $command
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build $ENV{'GOARCH'},$ENV{'GOOS'}
package unix
const(
EOF
my $offset = 0;
sub fmt {
my ($name, $num) = @_;
if($num > 999){
# ignore deprecated syscalls that are no longer implemented
# https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
return;
}
$name =~ y/a-z/A-Z/;
$num = $num + $offset;
print " SYS_$name = $num;\n";
}
my $prev;
open(CC, "$ENV{'CC'} -E -dD @ARGV |") || die "can't run $ENV{'CC'}";
while(<CC>){
if(/^#define __NR_Linux\s+([0-9]+)/){
# mips/mips64: extract offset
$offset = $1;
}
elsif(/^#define __NR(\w*)_SYSCALL_BASE\s+([0-9]+)/){
# arm: extract offset
$offset = $1;
}
elsif(/^#define __NR_syscalls\s+/) {
# ignore redefinitions of __NR_syscalls
}
elsif(/^#define __NR_(\w*)Linux_syscalls\s+/) {
# mips/mips64: ignore definitions about the number of syscalls
}
elsif(/^#define __NR_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR3264_(\w+)\s+([0-9]+)/){
$prev = $2;
fmt($1, $2);
}
elsif(/^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)/){
fmt($1, $prev+$2)
}
elsif(/^#define __NR_(\w+)\s+\(__NR_Linux \+ ([0-9]+)/){
fmt($1, $2);
}
elsif(/^#define __NR_(\w+)\s+\(__NR_SYSCALL_BASE \+ ([0-9]+)/){
fmt($1, $2);
}
}
print <<EOF;
)
EOF
unix/zsysnum_linux_386.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include -m32 /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include -m32 /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build 386,linux
......
unix/zsysnum_linux_amd64.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include -m64 /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include -m64 /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build amd64,linux
......
unix/zsysnum_linux_arm.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build arm,linux
......
unix/zsysnum_linux_arm64.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include -fsigned-char /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include -fsigned-char /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build arm64,linux
......
unix/zsysnum_linux_mips.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build mips,linux
......
unix/zsysnum_linux_mips64.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build mips64,linux
......
unix/zsysnum_linux_mips64le.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build mips64le,linux
......
unix/zsysnum_linux_mipsle.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build mipsle,linux
......
unix/zsysnum_linux_ppc64.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build ppc64,linux
......
unix/zsysnum_linux_ppc64le.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build ppc64le,linux
......
unix/zsysnum_linux_riscv64.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build riscv64,linux
......
unix/zsysnum_linux_s390x.go
View file @ a5c9d58d
// linux/mksysnum.pl -Wall -Werror -static -I/tmp/include -fsigned-char /tmp/include/asm/unistd.h
// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/include -fsigned-char /tmp/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build s390x,linux
......
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