mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-27 10:05:39 +00:00
329 lines
8.0 KiB
Perl
329 lines
8.0 KiB
Perl
#!/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.
|
|
|
|
# This program reads a file containing function prototypes
|
|
# (like syscall_darwin.go) and generates system call bodies.
|
|
# The prototypes are marked by lines beginning with "//sys"
|
|
# and read like func declarations if //sys is replaced by func, but:
|
|
# * The parameter lists must give a name for each argument.
|
|
# This includes return parameters.
|
|
# * The parameter lists must give a type for each argument:
|
|
# the (x, y, z int) shorthand is not allowed.
|
|
# * If the return parameter is an error number, it must be named errno.
|
|
|
|
# A line beginning with //sysnb is like //sys, except that the
|
|
# goroutine will not be suspended during the execution of the system
|
|
# call. This must only be used for system calls which can never
|
|
# block, as otherwise the system call could cause all goroutines to
|
|
# hang.
|
|
|
|
use strict;
|
|
|
|
my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
|
|
my $errors = 0;
|
|
my $_32bit = "";
|
|
my $plan9 = 0;
|
|
my $openbsd = 0;
|
|
my $netbsd = 0;
|
|
my $dragonfly = 0;
|
|
my $arm = 0; # 64-bit value should use (even, odd)-pair
|
|
my $tags = ""; # build tags
|
|
|
|
if($ARGV[0] eq "-b32") {
|
|
$_32bit = "big-endian";
|
|
shift;
|
|
} elsif($ARGV[0] eq "-l32") {
|
|
$_32bit = "little-endian";
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-plan9") {
|
|
$plan9 = 1;
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-openbsd") {
|
|
$openbsd = 1;
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-netbsd") {
|
|
$netbsd = 1;
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-dragonfly") {
|
|
$dragonfly = 1;
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-arm") {
|
|
$arm = 1;
|
|
shift;
|
|
}
|
|
if($ARGV[0] eq "-tags") {
|
|
shift;
|
|
$tags = $ARGV[0];
|
|
shift;
|
|
}
|
|
|
|
if($ARGV[0] =~ /^-/) {
|
|
print STDERR "usage: mksyscall.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
|
|
exit 1;
|
|
}
|
|
|
|
# Check that we are using the new build system if we should
|
|
if($ENV{'GOOS'} eq "linux" && $ENV{'GOARCH'} ne "sparc64") {
|
|
if($ENV{'GOLANG_SYS_BUILD'} ne "docker") {
|
|
print STDERR "In the new build system, mksyscall should not be called directly.\n";
|
|
print STDERR "See README.md\n";
|
|
exit 1;
|
|
}
|
|
}
|
|
|
|
|
|
sub parseparamlist($) {
|
|
my ($list) = @_;
|
|
$list =~ s/^\s*//;
|
|
$list =~ s/\s*$//;
|
|
if($list eq "") {
|
|
return ();
|
|
}
|
|
return split(/\s*,\s*/, $list);
|
|
}
|
|
|
|
sub parseparam($) {
|
|
my ($p) = @_;
|
|
if($p !~ /^(\S*) (\S*)$/) {
|
|
print STDERR "$ARGV:$.: malformed parameter: $p\n";
|
|
$errors = 1;
|
|
return ("xx", "int");
|
|
}
|
|
return ($1, $2);
|
|
}
|
|
|
|
my $text = "";
|
|
while(<>) {
|
|
chomp;
|
|
s/\s+/ /g;
|
|
s/^\s+//;
|
|
s/\s+$//;
|
|
my $nonblock = /^\/\/sysnb /;
|
|
next if !/^\/\/sys / && !$nonblock;
|
|
|
|
# Line must be of the form
|
|
# func Open(path string, mode int, perm int) (fd int, errno error)
|
|
# Split into name, in params, out params.
|
|
if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*((?i)SYS_[A-Z0-9_]+))?$/) {
|
|
print STDERR "$ARGV:$.: malformed //sys declaration\n";
|
|
$errors = 1;
|
|
next;
|
|
}
|
|
my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);
|
|
|
|
# Split argument lists on comma.
|
|
my @in = parseparamlist($in);
|
|
my @out = parseparamlist($out);
|
|
|
|
# Try in vain to keep people from editing this file.
|
|
# The theory is that they jump into the middle of the file
|
|
# without reading the header.
|
|
$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
|
|
|
|
# Go function header.
|
|
my $out_decl = @out ? sprintf(" (%s)", join(', ', @out)) : "";
|
|
$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out_decl;
|
|
|
|
# Check if err return available
|
|
my $errvar = "";
|
|
foreach my $p (@out) {
|
|
my ($name, $type) = parseparam($p);
|
|
if($type eq "error") {
|
|
$errvar = $name;
|
|
last;
|
|
}
|
|
}
|
|
|
|
# Prepare arguments to Syscall.
|
|
my @args = ();
|
|
my $n = 0;
|
|
foreach my $p (@in) {
|
|
my ($name, $type) = parseparam($p);
|
|
if($type =~ /^\*/) {
|
|
push @args, "uintptr(unsafe.Pointer($name))";
|
|
} elsif($type eq "string" && $errvar ne "") {
|
|
$text .= "\tvar _p$n *byte\n";
|
|
$text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
|
|
$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
|
|
push @args, "uintptr(unsafe.Pointer(_p$n))";
|
|
$n++;
|
|
} elsif($type eq "string") {
|
|
print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
|
|
$text .= "\tvar _p$n *byte\n";
|
|
$text .= "\t_p$n, _ = BytePtrFromString($name)\n";
|
|
push @args, "uintptr(unsafe.Pointer(_p$n))";
|
|
$n++;
|
|
} elsif($type =~ /^\[\](.*)/) {
|
|
# Convert slice into pointer, length.
|
|
# Have to be careful not to take address of &a[0] if len == 0:
|
|
# pass dummy pointer in that case.
|
|
# Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
|
|
$text .= "\tvar _p$n unsafe.Pointer\n";
|
|
$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
|
|
$text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
|
|
$text .= "\n";
|
|
push @args, "uintptr(_p$n)", "uintptr(len($name))";
|
|
$n++;
|
|
} elsif($type eq "int64" && ($openbsd || $netbsd)) {
|
|
push @args, "0";
|
|
if($_32bit eq "big-endian") {
|
|
push @args, "uintptr($name>>32)", "uintptr($name)";
|
|
} elsif($_32bit eq "little-endian") {
|
|
push @args, "uintptr($name)", "uintptr($name>>32)";
|
|
} else {
|
|
push @args, "uintptr($name)";
|
|
}
|
|
} elsif($type eq "int64" && $dragonfly) {
|
|
if ($func !~ /^extp(read|write)/i) {
|
|
push @args, "0";
|
|
}
|
|
if($_32bit eq "big-endian") {
|
|
push @args, "uintptr($name>>32)", "uintptr($name)";
|
|
} elsif($_32bit eq "little-endian") {
|
|
push @args, "uintptr($name)", "uintptr($name>>32)";
|
|
} else {
|
|
push @args, "uintptr($name)";
|
|
}
|
|
} elsif($type eq "int64" && $_32bit ne "") {
|
|
if(@args % 2 && $arm) {
|
|
# arm abi specifies 64-bit argument uses
|
|
# (even, odd) pair
|
|
push @args, "0"
|
|
}
|
|
if($_32bit eq "big-endian") {
|
|
push @args, "uintptr($name>>32)", "uintptr($name)";
|
|
} else {
|
|
push @args, "uintptr($name)", "uintptr($name>>32)";
|
|
}
|
|
} else {
|
|
push @args, "uintptr($name)";
|
|
}
|
|
}
|
|
|
|
# Determine which form to use; pad args with zeros.
|
|
my $asm = "Syscall";
|
|
if ($nonblock) {
|
|
$asm = "RawSyscall";
|
|
}
|
|
if(@args <= 3) {
|
|
while(@args < 3) {
|
|
push @args, "0";
|
|
}
|
|
} elsif(@args <= 6) {
|
|
$asm .= "6";
|
|
while(@args < 6) {
|
|
push @args, "0";
|
|
}
|
|
} elsif(@args <= 9) {
|
|
$asm .= "9";
|
|
while(@args < 9) {
|
|
push @args, "0";
|
|
}
|
|
} else {
|
|
print STDERR "$ARGV:$.: too many arguments to system call\n";
|
|
}
|
|
|
|
# System call number.
|
|
if($sysname eq "") {
|
|
$sysname = "SYS_$func";
|
|
$sysname =~ s/([a-z])([A-Z])/${1}_$2/g; # turn FooBar into Foo_Bar
|
|
$sysname =~ y/a-z/A-Z/;
|
|
}
|
|
|
|
# Actual call.
|
|
my $args = join(', ', @args);
|
|
my $call = "$asm($sysname, $args)";
|
|
|
|
# Assign return values.
|
|
my $body = "";
|
|
my @ret = ("_", "_", "_");
|
|
my $do_errno = 0;
|
|
for(my $i=0; $i<@out; $i++) {
|
|
my $p = $out[$i];
|
|
my ($name, $type) = parseparam($p);
|
|
my $reg = "";
|
|
if($name eq "err" && !$plan9) {
|
|
$reg = "e1";
|
|
$ret[2] = $reg;
|
|
$do_errno = 1;
|
|
} elsif($name eq "err" && $plan9) {
|
|
$ret[0] = "r0";
|
|
$ret[2] = "e1";
|
|
next;
|
|
} else {
|
|
$reg = sprintf("r%d", $i);
|
|
$ret[$i] = $reg;
|
|
}
|
|
if($type eq "bool") {
|
|
$reg = "$reg != 0";
|
|
}
|
|
if($type eq "int64" && $_32bit ne "") {
|
|
# 64-bit number in r1:r0 or r0:r1.
|
|
if($i+2 > @out) {
|
|
print STDERR "$ARGV:$.: not enough registers for int64 return\n";
|
|
}
|
|
if($_32bit eq "big-endian") {
|
|
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
|
|
} else {
|
|
$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
|
|
}
|
|
$ret[$i] = sprintf("r%d", $i);
|
|
$ret[$i+1] = sprintf("r%d", $i+1);
|
|
}
|
|
if($reg ne "e1" || $plan9) {
|
|
$body .= "\t$name = $type($reg)\n";
|
|
}
|
|
}
|
|
if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
|
|
$text .= "\t$call\n";
|
|
} else {
|
|
$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
|
|
}
|
|
$text .= $body;
|
|
|
|
if ($plan9 && $ret[2] eq "e1") {
|
|
$text .= "\tif int32(r0) == -1 {\n";
|
|
$text .= "\t\terr = e1\n";
|
|
$text .= "\t}\n";
|
|
} elsif ($do_errno) {
|
|
$text .= "\tif e1 != 0 {\n";
|
|
$text .= "\t\terr = errnoErr(e1)\n";
|
|
$text .= "\t}\n";
|
|
}
|
|
$text .= "\treturn\n";
|
|
$text .= "}\n\n";
|
|
}
|
|
|
|
chomp $text;
|
|
chomp $text;
|
|
|
|
if($errors) {
|
|
exit 1;
|
|
}
|
|
|
|
print <<EOF;
|
|
// $cmdline
|
|
// Code generated by the command above; see README.md. DO NOT EDIT.
|
|
|
|
// +build $tags
|
|
|
|
package unix
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
var _ syscall.Errno
|
|
|
|
$text
|
|
EOF
|
|
exit 0;
|