| #!/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. |
| |
| $cmdline = "mksyscall_windows.sh " . join(' ', @ARGV); |
| $errors = 0; |
| $_32bit = ""; |
| |
| if($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.sh [-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); |
| } |
| |
| $text = ""; |
| $vars = ""; |
| $mods = ""; |
| $modnames = ""; |
| while(<>) { |
| chomp; |
| s/\s+/ /g; |
| s/^\s+//; |
| s/\s+$//; |
| 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"; |
| } |
| $modvname = "mod$modname"; |
| if($modnames !~ /$modname/) { |
| $modnames .= ".$modname"; |
| $mods .= "\t$modvname = loadDll(\"$modname.dll\")\n"; |
| } |
| |
| # System call name. |
| if($sysname eq "") { |
| $sysname = "$func"; |
| } |
| |
| # System call pointer variable name. |
| $sysvarname = "proc$sysname"; |
| |
| # Returned value when failed |
| if($failcond eq "") { |
| $failcond = "==0"; |
| } |
| |
| # Decide which version of api is used: ascii or unicode. |
| if($sysname !~ /W$/) { |
| $strconvfunc = "StringBytePtr"; |
| } else { |
| $strconvfunc = "StringToUTF16Ptr"; |
| } |
| |
| # Winapi proc address variable. |
| $vars .= sprintf "\t%s = getSysProcAddr(%s, \"%s\")\n", $sysvarname, $modvname, $sysname; |
| |
| # Go function header. |
| $text .= sprintf "func %s(%s) (%s) {\n", $func, join(', ', @in), join(', ', @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 { _p$n = \&${name}[0]; }\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 $name { _p$n = 1; } else { _p$n = 0;}\n"; |
| push @args, "uintptr(_p$n)"; |
| } else { |
| push @args, "uintptr($name)"; |
| } |
| push @pin, sprintf "\"%s=\", %s, ", $name, $name; |
| } |
| |
| # 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, $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 $failcond"; |
| } |
| } |
| if($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"; |
| $text .= "}\n\n"; |
| } |
| |
| if($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; |