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b663783717
For 3rd parties building binary packages, and for build consistency in general, it is very helpful to have the same set of dependencies at any time the product is built. See [tools/godep](https://github.com/tools/godep) for further details.
328 lines
8 KiB
Perl
Executable file
328 lines
8 KiB
Perl
Executable file
#!/usr/bin/env perl
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# Copyright 2009 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# This program reads a file containing function prototypes
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# (like syscall_darwin.go) and generates system call bodies.
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# The prototypes are marked by lines beginning with "//sys"
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# and read like func declarations if //sys is replaced by func, but:
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# * The parameter lists must give a name for each argument.
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# This includes return parameters.
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# * The parameter lists must give a type for each argument:
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# the (x, y, z int) shorthand is not allowed.
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# * If the return parameter is an error number, it must be named errno.
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# A line beginning with //sysnb is like //sys, except that the
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# goroutine will not be suspended during the execution of the system
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# call. This must only be used for system calls which can never
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# block, as otherwise the system call could cause all goroutines to
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# hang.
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use strict;
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my $cmdline = "mksyscall.pl " . join(' ', @ARGV);
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my $errors = 0;
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my $_32bit = "";
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my $plan9 = 0;
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my $openbsd = 0;
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my $netbsd = 0;
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my $dragonfly = 0;
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my $arm = 0; # 64-bit value should use (even, odd)-pair
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my $tags = ""; # build tags
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if($ARGV[0] eq "-b32") {
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$_32bit = "big-endian";
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shift;
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} elsif($ARGV[0] eq "-l32") {
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$_32bit = "little-endian";
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shift;
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}
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if($ARGV[0] eq "-plan9") {
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$plan9 = 1;
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shift;
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}
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if($ARGV[0] eq "-openbsd") {
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$openbsd = 1;
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shift;
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}
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if($ARGV[0] eq "-netbsd") {
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$netbsd = 1;
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shift;
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}
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if($ARGV[0] eq "-dragonfly") {
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$dragonfly = 1;
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shift;
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}
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if($ARGV[0] eq "-arm") {
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$arm = 1;
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shift;
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}
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if($ARGV[0] eq "-tags") {
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shift;
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$tags = $ARGV[0];
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shift;
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}
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if($ARGV[0] =~ /^-/) {
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print STDERR "usage: mksyscall.pl [-b32 | -l32] [-tags x,y] [file ...]\n";
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exit 1;
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}
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# Check that we are using the new build system if we should
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if($ENV{'GOOS'} eq "linux" && $ENV{'GOARCH'} ne "sparc64") {
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if($ENV{'GOLANG_SYS_BUILD'} ne "docker") {
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print STDERR "In the new build system, mksyscall should not be called directly.\n";
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print STDERR "See README.md\n";
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exit 1;
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}
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}
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sub parseparamlist($) {
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my ($list) = @_;
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$list =~ s/^\s*//;
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$list =~ s/\s*$//;
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if($list eq "") {
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return ();
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}
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return split(/\s*,\s*/, $list);
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}
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sub parseparam($) {
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my ($p) = @_;
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if($p !~ /^(\S*) (\S*)$/) {
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print STDERR "$ARGV:$.: malformed parameter: $p\n";
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$errors = 1;
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return ("xx", "int");
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}
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return ($1, $2);
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}
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my $text = "";
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while(<>) {
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chomp;
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s/\s+/ /g;
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s/^\s+//;
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s/\s+$//;
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my $nonblock = /^\/\/sysnb /;
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next if !/^\/\/sys / && !$nonblock;
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# Line must be of the form
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# func Open(path string, mode int, perm int) (fd int, errno error)
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# Split into name, in params, out params.
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if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*((?i)SYS_[A-Z0-9_]+))?$/) {
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print STDERR "$ARGV:$.: malformed //sys declaration\n";
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$errors = 1;
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next;
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}
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my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);
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# Split argument lists on comma.
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my @in = parseparamlist($in);
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my @out = parseparamlist($out);
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# Try in vain to keep people from editing this file.
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# The theory is that they jump into the middle of the file
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# without reading the header.
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$text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n";
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# Go function header.
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my $out_decl = @out ? sprintf(" (%s)", join(', ', @out)) : "";
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$text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out_decl;
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# Check if err return available
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my $errvar = "";
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foreach my $p (@out) {
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my ($name, $type) = parseparam($p);
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if($type eq "error") {
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$errvar = $name;
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last;
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}
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}
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# Prepare arguments to Syscall.
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my @args = ();
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my $n = 0;
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foreach my $p (@in) {
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my ($name, $type) = parseparam($p);
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if($type =~ /^\*/) {
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push @args, "uintptr(unsafe.Pointer($name))";
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} elsif($type eq "string" && $errvar ne "") {
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$text .= "\tvar _p$n *byte\n";
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$text .= "\t_p$n, $errvar = BytePtrFromString($name)\n";
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$text .= "\tif $errvar != nil {\n\t\treturn\n\t}\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))";
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$n++;
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} elsif($type eq "string") {
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print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n";
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$text .= "\tvar _p$n *byte\n";
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$text .= "\t_p$n, _ = BytePtrFromString($name)\n";
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push @args, "uintptr(unsafe.Pointer(_p$n))";
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$n++;
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} elsif($type =~ /^\[\](.*)/) {
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# Convert slice into pointer, length.
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# Have to be careful not to take address of &a[0] if len == 0:
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# pass dummy pointer in that case.
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# Used to pass nil, but some OSes or simulators reject write(fd, nil, 0).
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$text .= "\tvar _p$n unsafe.Pointer\n";
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$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
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$text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero)\n\t}";
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$text .= "\n";
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push @args, "uintptr(_p$n)", "uintptr(len($name))";
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$n++;
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} elsif($type eq "int64" && ($openbsd || $netbsd)) {
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push @args, "0";
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if($_32bit eq "big-endian") {
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push @args, "uintptr($name>>32)", "uintptr($name)";
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} elsif($_32bit eq "little-endian") {
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push @args, "uintptr($name)", "uintptr($name>>32)";
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} else {
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push @args, "uintptr($name)";
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}
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} elsif($type eq "int64" && $dragonfly) {
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if ($func !~ /^extp(read|write)/i) {
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push @args, "0";
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}
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if($_32bit eq "big-endian") {
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push @args, "uintptr($name>>32)", "uintptr($name)";
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} elsif($_32bit eq "little-endian") {
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push @args, "uintptr($name)", "uintptr($name>>32)";
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} else {
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push @args, "uintptr($name)";
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}
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} elsif($type eq "int64" && $_32bit ne "") {
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if(@args % 2 && $arm) {
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# arm abi specifies 64-bit argument uses
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# (even, odd) pair
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push @args, "0"
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}
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if($_32bit eq "big-endian") {
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push @args, "uintptr($name>>32)", "uintptr($name)";
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} else {
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push @args, "uintptr($name)", "uintptr($name>>32)";
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}
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} else {
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push @args, "uintptr($name)";
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}
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}
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# Determine which form to use; pad args with zeros.
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my $asm = "Syscall";
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if ($nonblock) {
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$asm = "RawSyscall";
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}
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if(@args <= 3) {
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while(@args < 3) {
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push @args, "0";
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}
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} elsif(@args <= 6) {
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$asm .= "6";
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while(@args < 6) {
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push @args, "0";
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}
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} elsif(@args <= 9) {
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$asm .= "9";
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while(@args < 9) {
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push @args, "0";
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}
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} else {
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print STDERR "$ARGV:$.: too many arguments to system call\n";
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}
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# System call number.
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if($sysname eq "") {
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$sysname = "SYS_$func";
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$sysname =~ s/([a-z])([A-Z])/${1}_$2/g; # turn FooBar into Foo_Bar
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$sysname =~ y/a-z/A-Z/;
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}
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# Actual call.
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my $args = join(', ', @args);
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my $call = "$asm($sysname, $args)";
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# Assign return values.
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my $body = "";
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my @ret = ("_", "_", "_");
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my $do_errno = 0;
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for(my $i=0; $i<@out; $i++) {
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my $p = $out[$i];
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my ($name, $type) = parseparam($p);
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my $reg = "";
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if($name eq "err" && !$plan9) {
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$reg = "e1";
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$ret[2] = $reg;
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$do_errno = 1;
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} elsif($name eq "err" && $plan9) {
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$ret[0] = "r0";
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$ret[2] = "e1";
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next;
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} else {
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$reg = sprintf("r%d", $i);
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$ret[$i] = $reg;
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}
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if($type eq "bool") {
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$reg = "$reg != 0";
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}
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if($type eq "int64" && $_32bit ne "") {
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# 64-bit number in r1:r0 or r0:r1.
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if($i+2 > @out) {
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print STDERR "$ARGV:$.: not enough registers for int64 return\n";
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}
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if($_32bit eq "big-endian") {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i, $i+1);
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} else {
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$reg = sprintf("int64(r%d)<<32 | int64(r%d)", $i+1, $i);
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}
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$ret[$i] = sprintf("r%d", $i);
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$ret[$i+1] = sprintf("r%d", $i+1);
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}
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if($reg ne "e1" || $plan9) {
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$body .= "\t$name = $type($reg)\n";
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}
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}
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if ($ret[0] eq "_" && $ret[1] eq "_" && $ret[2] eq "_") {
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$text .= "\t$call\n";
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} else {
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$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
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}
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$text .= $body;
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if ($plan9 && $ret[2] eq "e1") {
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$text .= "\tif int32(r0) == -1 {\n";
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$text .= "\t\terr = e1\n";
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$text .= "\t}\n";
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} elsif ($do_errno) {
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$text .= "\tif e1 != 0 {\n";
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$text .= "\t\terr = errnoErr(e1)\n";
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$text .= "\t}\n";
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}
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$text .= "\treturn\n";
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$text .= "}\n\n";
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}
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chomp $text;
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chomp $text;
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if($errors) {
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exit 1;
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}
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print <<EOF;
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// $cmdline
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build $tags
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package unix
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import (
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"syscall"
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"unsafe"
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)
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var _ syscall.Errno
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$text
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EOF
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exit 0;
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