diff options
Diffstat (limited to 'src/pkg/syscall/mksyscall_windows.pl')
| -rwxr-xr-x | src/pkg/syscall/mksyscall_windows.pl | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/src/pkg/syscall/mksyscall_windows.pl b/src/pkg/syscall/mksyscall_windows.pl new file mode 100755 index 000000000..4b245976e --- /dev/null +++ b/src/pkg/syscall/mksyscall_windows.pl @@ -0,0 +1,294 @@ +#!/usr/bin/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. +# * If go func name needs to be different from it's winapi dll name, +# the winapi name could be specified at the end, after "=" sign, like +# //sys LoadLibrary(libname string) (handle uint32, errno int) = LoadLibraryA +# * Each function, that returns errno, needs to supply a condition, +# that return value of winapi will be tested against to +# detect failure. This would set errno to windows "last-error", +# otherwise it will be 0. The value can be provided +# at end of //sys declaration, like +# //sys LoadLibrary(libname string) (handle uint32, errno int) [failretval==-1] = LoadLibraryA +# and is [failretval==0] by default. + +use strict; + +my $cmdline = "mksyscall_windows.pl " . join(' ', @ARGV); +my $errors = 0; +my $_32bit = ""; + +binmode STDOUT; + +if($ARGV[0] eq "-b32") { + $_32bit = "big-endian"; + shift; +} elsif($ARGV[0] eq "-l32") { + $_32bit = "little-endian"; + shift; +} + +if($ARGV[0] =~ /^-/) { + print STDERR "usage: mksyscall_windows.pl [-b32 | -l32] [file ...]\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 = ""; +my $vars = ""; +my $mods = ""; +my $modnames = ""; +while(<>) { + chomp; + s/\s+/ /g; + s/^\s+//; + s/\s+$//; + next if !/^\/\/sys /; + + # Line must be of the form + # func Open(path string, mode int, perm int) (fd int, errno int) + # Split into name, in params, out params. + if(!/^\/\/sys (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:\[failretval(.*)\])?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) { + print STDERR "$ARGV:$.: malformed //sys declaration\n"; + $errors = 1; + next; + } + my ($func, $in, $out, $failcond, $modname, $sysname) = ($1, $2, $3, $4, $5, $6); + + # Split argument lists on comma. + my @in = parseparamlist($in); + my @out = parseparamlist($out); + + # Dll file name. + if($modname eq "") { + $modname = "kernel32"; + } + my $modvname = "mod$modname"; + if($modnames !~ /$modname/) { + $modnames .= ".$modname"; + $mods .= "\t$modvname = NewLazyDLL(\"$modname.dll\")\n"; + } + + # System call name. + if($sysname eq "") { + $sysname = "$func"; + } + + # System call pointer variable name. + my $sysvarname = "proc$sysname"; + + # Returned value when failed + if($failcond eq "") { + $failcond = "== 0"; + } + + # Decide which version of api is used: ascii or unicode. + my $strconvfunc = $sysname !~ /W$/ ? "StringBytePtr" : "StringToUTF16Ptr"; + + # Winapi proc address variable. + $vars .= "\t$sysvarname = $modvname.NewProc(\"$sysname\")\n"; + + # Go function header. + $out = join(', ', @out); + if($out ne "") { + $out = " ($out)"; + } + if($text ne "") { + $text .= "\n" + } + $text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out; + + # Prepare arguments to Syscall. + my @args = (); + my $n = 0; + my @pin= (); + foreach my $p (@in) { + my ($name, $type) = parseparam($p); + if($type =~ /^\*/) { + push @args, "uintptr(unsafe.Pointer($name))"; + } elsif($type eq "string") { + push @args, "uintptr(unsafe.Pointer($strconvfunc($name)))"; + } elsif($type =~ /^\[\](.*)/) { + # Convert slice into pointer, length. + # Have to be careful not to take address of &a[0] if len == 0: + # pass nil in that case. + $text .= "\tvar _p$n *$1\n"; + $text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n"; + push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))"; + $n++; + } elsif($type eq "int64" && $_32bit ne "") { + if($_32bit eq "big-endian") { + push @args, "uintptr($name >> 32)", "uintptr($name)"; + } else { + push @args, "uintptr($name)", "uintptr($name >> 32)"; + } + } elsif($type eq "bool") { + $text .= "\tvar _p$n uint32\n"; + $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n"; + push @args, "uintptr(_p$n)"; + $n++; + } else { + push @args, "uintptr($name)"; + } + push @pin, sprintf "\"%s=\", %s, ", $name, $name; + } + my $nargs = @args; + + # Determine which form to use; pad args with zeros. + my $asm = "Syscall"; + if(@args <= 3) { + while(@args < 3) { + push @args, "0"; + } + } elsif(@args <= 6) { + $asm = "Syscall6"; + while(@args < 6) { + push @args, "0"; + } + } elsif(@args <= 9) { + $asm = "Syscall9"; + while(@args < 9) { + push @args, "0"; + } + } elsif(@args <= 12) { + $asm = "Syscall12"; + while(@args < 12) { + push @args, "0"; + } + } else { + print STDERR "$ARGV:$.: too many arguments to system call\n"; + } + + # Actual call. + my $args = join(', ', @args); + my $call = "$asm($sysvarname.Addr(), $nargs, $args)"; + + # Assign return values. + my $body = ""; + my $failexpr = ""; + my @ret = ("_", "_", "_"); + my @pout= (); + for(my $i=0; $i<@out; $i++) { + my $p = $out[$i]; + my ($name, $type) = parseparam($p); + my $reg = ""; + if($name eq "errno") { + $reg = "e1"; + $ret[2] = $reg; + } 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); + } + my $rettype = $type; + if($type =~ /^\*/) { + $reg = "unsafe.Pointer($reg)"; + $rettype = "($rettype)"; + } + if($i == 0) { + if($type eq "bool") { + $failexpr = "!$name"; + } elsif($name eq "errno") { + $ret[$i] = "r1"; + $failexpr = "int(r1) $failcond"; + } else { + $failexpr = "$name $failcond"; + } + } + $failexpr =~ s/(=)([0-9A-Za-z\-+])/$1 $2/; # gofmt compatible + if($name eq "errno") { + # Set errno to "last error" only if returned value indicate failure + $body .= "\tif $failexpr {\n"; + $body .= "\t\tif $reg != 0 {\n"; + $body .= "\t\t\t$name = $type($reg)\n"; + $body .= "\t\t} else {\n"; + $body .= "\t\t\t$name = EINVAL\n"; + $body .= "\t\t}\n"; + $body .= "\t} else {\n"; + $body .= "\t\t$name = 0\n"; + $body .= "\t}\n"; + } else { + $body .= "\t$name = $rettype($reg)\n"; + } + push @pout, sprintf "\"%s=\", %s, ", $name, $name; + } + if ($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(0) { + $text .= sprintf 'print("SYSCALL: %s(", %s") (", %s")\n")%s', $func, join('", ", ', @pin), join('", ", ', @pout), "\n"; + } + + $text .= "\treturn\n"; + $text .= "}\n"; +} + +if($errors) { + exit 1; +} + +print <<EOF; +// $cmdline +// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT + +package syscall + +import "unsafe" + +var ( +$mods +$vars +) + +$text + +EOF +exit 0; |